Update README to reflect command-line flag configuration

- Replace environment variables with command-line flags
- Update run example with proper flag syntax
- Fix database schema path to misc/sql/initdb.sql
- Add missing configuration options (gopher, seed-url-path, max-db-connections)
- Remove outdated configuration options

.gitignore

@@ -1,7 +1,9 @@
 **/.#*
 **/*~
+**/.DS_Store
 /.idea
 /.goroot
+/dist/**
 /blacklist.txt
 /check.sh
 /debug.sh
@@ -13,5 +15,15 @@
 run*.sh
 /main
 /db/migration*/**
-/db/populate/**
+/cmd/populate/**
 /db/sql/**
+
+**/.claude/settings.local.json
+
+/crawl.sh
+/crawler.sh
+/get.sh
+/snapshot_history.sh
+/whitelist.txt
+
+/CLAUDE.md

ARCHITECTURE.md

@@ -0,0 +1,169 @@
+# gemini-grc Architectural Notes
+
+## 20250513 - Versioned Snapshots
+
+The crawler now supports saving multiple versions of the same URL over time, similar to the Internet Archive's Wayback Machine. This document outlines the architecture and changes made to support this feature.
+
+### Database Schema Changes
+
+The following changes to the database schema are required:
+
+```sql
+-- Remove UNIQUE constraint from url in snapshots table
+ALTER TABLE snapshots DROP CONSTRAINT unique_url;
+
+-- Create a composite primary key using url and timestamp
+CREATE UNIQUE INDEX idx_url_timestamp ON snapshots (url, timestamp);
+
+-- Add a new index to efficiently find the latest snapshot
+CREATE INDEX idx_url_latest ON snapshots (url, timestamp DESC);
+```
+
+## Error handling
+- `xerrors` library is used for error creation/wrapping.
+- The "Fatal" field is not used, we _always_ panic on fatal errors.
+- _All_ internal functions _must_ return `xerror` errors.
+- _All_ external errors are wrapped within `xerror` errors.
+
+
+### Code Changes
+
+1. **Updated SQL Queries**:
+   - Changed queries to insert new snapshots without conflict handling
+   - Added queries to retrieve snapshots by timestamp
+   - Added queries to retrieve all snapshots for a URL
+   - Added queries to retrieve snapshots in a date range
+
+2. **Context-Aware Database Methods**:
+   - `SaveSnapshot`: Saves a new snapshot with the current timestamp using a context
+   - `GetLatestSnapshot`: Retrieves the most recent snapshot for a URL using a context
+   - `GetSnapshotAtTimestamp`: Retrieves the nearest snapshot at or before a given timestamp using a context
+   - `GetAllSnapshotsForURL`: Retrieves all snapshots for a URL using a context
+   - `GetSnapshotsByDateRange`: Retrieves snapshots within a date range using a context
+
+3. **Backward Compatibility**:
+   - The `OverwriteSnapshot` method has been maintained for backward compatibility
+   - It now delegates to `SaveSnapshot`, effectively creating a new version instead of overwriting
+
+### Utility Scripts
+
+A new utility script `snapshot_history.sh` has been created to demonstrate the versioned snapshot functionality:
+
+- Retrieve the latest snapshot for a URL
+- Retrieve a snapshot at a specific point in time
+- Retrieve all snapshots for a URL
+- Retrieve snapshots within a date range
+
+### Usage Examples
+
+```bash
+# Get the latest snapshot
+./snapshot_history.sh -u gemini://example.com/
+
+# Get a snapshot from a specific point in time
+./snapshot_history.sh -u gemini://example.com/ -t 2023-05-01T12:00:00Z
+
+# Get all snapshots for a URL
+./snapshot_history.sh -u gemini://example.com/ -a
+
+# Get snapshots in a date range
+./snapshot_history.sh -u gemini://example.com/ -r 2023-01-01T00:00:00Z 2023-12-31T23:59:59Z
+```
+
+### API Usage Examples
+
+```go
+// Save a new snapshot
+ctx := context.Background()
+snapshot, _ := snapshot.SnapshotFromURL("gemini://example.com", true)
+tx, _ := Database.NewTx(ctx)
+err := Database.SaveSnapshot(ctx, tx, snapshot)
+tx.Commit()
+
+// Get the latest snapshot
+ctx := context.Background()
+tx, _ := Database.NewTx(ctx)
+latestSnapshot, err := Database.GetLatestSnapshot(ctx, tx, "gemini://example.com")
+tx.Commit()
+
+// Get a snapshot at a specific time
+ctx := context.Background()
+timestamp := time.Date(2023, 5, 1, 12, 0, 0, 0, time.UTC)
+tx, _ := Database.NewTx(ctx)
+historicalSnapshot, err := Database.GetSnapshotAtTimestamp(ctx, tx, "gemini://example.com", timestamp)
+tx.Commit()
+
+// Get all snapshots for a URL
+ctx := context.Background()
+tx, _ := Database.NewTx(ctx)
+allSnapshots, err := Database.GetAllSnapshotsForURL(ctx, tx, "gemini://example.com")
+tx.Commit()
+
+// Using a timeout context to limit database operations
+ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+defer cancel()
+tx, _ := Database.NewTx(ctx)
+latestSnapshot, err := Database.GetLatestSnapshot(ctx, tx, "gemini://example.com")
+tx.Commit()
+```
+
+### Content Deduplication Strategy
+
+The crawler implements a sophisticated content deduplication strategy that balances storage efficiency with comprehensive historical tracking:
+
+#### `--skip-identical-content` Flag Behavior
+
+**When `--skip-identical-content=true` (default)**:
+- All content types are checked for duplicates before storing
+- Identical content is skipped entirely to save storage space
+- Only changed content results in new snapshots
+- Applies to both Gemini and non-Gemini content uniformly
+
+**When `--skip-identical-content=false`**:
+- **Gemini content (`text/gemini` MIME type)**: Full historical tracking - every crawl creates a new snapshot regardless of content changes
+- **Non-Gemini content**: Still deduplicated - identical content is skipped even when flag is false
+- Enables comprehensive version history for Gemini capsules while avoiding unnecessary storage of duplicate static assets
+
+#### Implementation Details
+
+The deduplication logic is implemented in `shouldSkipIdenticalSnapshot()` function in `common/worker.go`:
+
+1. **Primary Check**: When `--skip-identical-content=true`, all content is checked for duplicates
+2. **MIME-Type Specific Check**: When the flag is false, only non-`text/gemini` content is checked for duplicates
+3. **Content Comparison**: Uses `IsContentIdentical()` which compares either GemText fields or binary Data fields
+4. **Dual Safety Checks**: Content is checked both in the worker layer and database layer for robustness
+
+This approach ensures that Gemini capsules get complete version history when desired, while preventing storage bloat from duplicate images, binaries, and other static content.
+
+### Time-based Crawl Frequency Control
+
+The crawler can be configured to skip re-crawling URLs that have been recently updated, using the `--skip-if-updated-days=N` parameter:
+
+* When set to a positive integer N, URLs that have a snapshot newer than N days ago will not be added to the crawl queue, even if they're found as links in other pages.
+* This feature helps control crawl frequency, ensuring that resources aren't wasted on frequently checking content that rarely changes.
+* Setting `--skip-if-updated-days=0` disables this feature, meaning all discovered URLs will be queued for crawling regardless of when they were last updated.
+* Default value is 60 days.
+* For example, `--skip-if-updated-days=7` will skip re-crawling any URL that has been crawled within the last week.
+
+### Worker Pool Architecture
+
+The crawler uses a sophisticated worker pool system with backpressure control:
+
+* **Buffered Channel**: Job queue size equals the number of workers (`NumOfWorkers`)
+* **Self-Regulating**: Channel backpressure naturally rate-limits the scheduler
+* **Context-Aware**: Each URL gets its own context with timeout (default 120s)
+* **Transaction Per Job**: Each worker operates within its own database transaction
+* **SafeRollback**: Uses `gemdb.SafeRollback()` for graceful transaction cleanup on errors
+
+### Database Transaction Patterns
+
+* **Context Separation**: Scheduler uses long-lived context, while database operations use fresh contexts
+* **Timeout Prevention**: Fresh `dbCtx := context.Background()` prevents scheduler timeouts from affecting DB operations
+* **Error Handling**: Distinguishes between context cancellation, fatal errors, and recoverable errors
+
+### Future Improvements
+
+1. Add a web interface to browse snapshot history
+2. Implement comparison features to highlight changes between snapshots
+3. Add metadata to track crawl batches
+4. Implement retention policies to manage storage

Makefile

@@ -1,10 +1,10 @@
-SHELL := /bin/env oksh
+SHELL := /bin/sh
 export PATH := $(PATH)
 
-all: fmt lintfix tidy test clean build
+all: fmt lintfix vet tidy test clean build
 
 clean:
-	rm -f ./gemini-grc
+	mkdir -p ./dist && rm -rf ./dist/*
 
 debug:
 	@echo "PATH: $(PATH)"
@@ -30,12 +30,17 @@ fmt:
 lint: fmt
 	golangci-lint run
 
+vet: fmt
+	go vet ./.../
+
 # Run linter and fix
 lintfix: fmt
 	golangci-lint run --fix
 
 build:
-	go build -race -o gemini-grc ./main.go
+	CGO_ENABLED=0 go build -o ./dist/get ./cmd/get/get.go
+	CGO_ENABLED=0 go build -o ./dist/crawl ./cmd/crawl/crawl.go
+	CGO_ENABLED=0 go build -o ./dist/crawler ./cmd/crawler/crawler.go
 
 show-updates:
 	go list -m -u all

NOTES.md

@@ -0,0 +1,13 @@
+# Notes
+
+Avoiding endless loops while crawling
+
+- Make sure we follow robots.txt
+- Announce our own agent so people can block us in their robots.txt
+- Put a limit on number of pages per host, and notify on limit reach.
+- Put a limit on the number of redirects (not needed?)
+
+Heuristics:
+
+- Do _not_ parse links from pages that have '/git/' or '/cgi/' or '/cgi-bin/' in their URLs.
+- Have a list of "whitelisted" hosts/urls that we visit in regular intervals.

README.md

@@ -4,57 +4,73 @@ A crawler for the [Gemini](https://en.wikipedia.org/wiki/Gemini_(protocol)) netw
 Easily extendable as a "wayback machine" of Gemini.
 
 ## Features
-- [x] Save image/* and text/* files
 - [x] Concurrent downloading with configurable number of workers
+- [x] Save image/* and text/* files
 - [x] Connection limit per host
 - [x] URL Blacklist
+- [x] URL Whitelist (overrides blacklist and robots.txt)
 - [x] Follow robots.txt, see gemini://geminiprotocol.net/docs/companion/robots.gmi
-- [x] Configuration via environment variables
+- [x] Configuration via command-line flags
 - [x] Storing capsule snapshots in PostgreSQL
 - [x] Proper response header & body UTF-8 and format validation
 - [x] Proper URL normalization
 - [x] Handle redirects (3X status codes)
 - [x] Crawl Gopher holes
 
+## Security Note
+This crawler uses `InsecureSkipVerify: true` in TLS configuration to accept all certificates. This is a common approach for crawlers but makes the application vulnerable to MITM attacks. This trade-off is made to enable crawling self-signed certificates widely used in the Gemini ecosystem.
+
 ## How to run
 
-Spin up a PostgreSQL, check `db/sql/initdb.sql` to create the tables and start the crawler.
-All configuration is done via environment variables.
+Spin up a PostgreSQL, check `misc/sql/initdb.sql` to create the tables and start the crawler.
+All configuration is done via command-line flags.
 
 ## Configuration
 
-Bool can be `true`,`false` or `0`,`1`.
+Available command-line flags:
 
 ```text
-	LogLevel               string // Logging level (debug, info, warn, error)
-	MaxResponseSize        int // Maximum size of response in bytes
-	NumOfWorkers           int // Number of concurrent workers
-	ResponseTimeout        int // Timeout for responses in seconds
-	WorkerBatchSize        int // Batch size for worker processing
-	PanicOnUnexpectedError bool // Panic on unexpected errors when visiting a URL
-	BlacklistPath          string // File that has blacklisted strings of "host:port"
-	DryRun                 bool // If false, don't write to disk
-	PrintWorkerStatus      bool // If false, print logs and not worker status table
+  -blacklist-path string
+        File that has blacklist regexes
+  -dry-run
+        Dry run mode
+  -gopher
+        Enable crawling of Gopher holes
+  -log-level string
+        Logging level (debug, info, warn, error) (default "info")
+  -max-db-connections int
+        Maximum number of database connections (default 100)
+  -max-response-size int
+        Maximum size of response in bytes (default 1048576)
+  -pgurl string
+        Postgres URL
+  -response-timeout int
+        Timeout for network responses in seconds (default 10)
+  -seed-url-path string
+        File with seed URLs that should be added to the queue immediately
+  -skip-if-updated-days int
+        Skip re-crawling URLs updated within this many days (0 to disable) (default 60)
+  -whitelist-path string
+        File with URLs that should always be crawled regardless of blacklist
+  -workers int
+        Number of concurrent workers (default 1)
 ```
 
 Example:
 
 ```shell
-LOG_LEVEL=info \
-NUM_OF_WORKERS=10 \
-WORKER_BATCH_SIZE=10 \
-BLACKLIST_PATH="./blacklist.txt" \ # one url per line, can be empty
-MAX_RESPONSE_SIZE=10485760 \
-RESPONSE_TIMEOUT=10 \
-PANIC_ON_UNEXPECTED_ERROR=true \
-PG_DATABASE=test \
-PG_HOST=127.0.0.1 \
-PG_MAX_OPEN_CONNECTIONS=100 \
-PG_PORT=5434 \
-PG_USER=test \
-PG_PASSWORD=test \
-DRY_RUN=false \
-./gemini-grc
+./dist/crawler \
+  -pgurl="postgres://test:test@127.0.0.1:5434/test?sslmode=disable" \
+  -log-level=info \
+  -workers=10 \
+  -blacklist-path="./blacklist.txt" \
+  -whitelist-path="./whitelist.txt" \
+  -max-response-size=10485760 \
+  -response-timeout=10 \
+  -max-db-connections=100 \
+  -skip-if-updated-days=7 \
+  -gopher \
+  -seed-url-path="./seed_urls.txt"
 ```
 
 ## Development
@@ -65,8 +81,30 @@ go install mvdan.cc/gofumpt@v0.7.0
 go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.63.4
 ```
 
+## Snapshot History
+
+The crawler now supports versioned snapshots, storing multiple snapshots of the same URL over time. This allows you to view how content changes over time, similar to the Internet Archive's Wayback Machine.
+
+### Accessing Snapshot History
+
+You can access the snapshot history using the included `snapshot_history.sh` script:
+
+```bash
+# Get the latest snapshot
+./snapshot_history.sh -u gemini://example.com/
+
+# Get a snapshot from a specific point in time
+./snapshot_history.sh -u gemini://example.com/ -t 2023-05-01T12:00:00Z
+
+# Get all snapshots for a URL
+./snapshot_history.sh -u gemini://example.com/ -a
+
+# Get snapshots in a date range
+./snapshot_history.sh -u gemini://example.com/ -r 2023-01-01T00:00:00Z 2023-12-31T23:59:59Z
+```
+
 ## TODO
-- [ ] Add snapshot history
+- [x] Add snapshot history
 - [ ] Add a web interface
 - [ ] Provide to servers a TLS cert for sites that require it, like Astrobotany
 - [ ] Use pledge/unveil in OpenBSD hosts
@@ -78,6 +116,9 @@ go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.63.4
 Good starting points:
 
 gemini://warmedal.se/~antenna/
+
 gemini://tlgs.one/
+
 gopher://i-logout.cz:70/1/bongusta/
+
 gopher://gopher.quux.org:70/

TODO.md

@@ -0,0 +1,38 @@
+# TODO
+
+## Outstanding Issues
+
+### 1. Ctrl+C Signal Handling Issue
+
+**Problem**: The crawler sometimes doesn't exit properly when Ctrl+C is pressed.
+
+**Root Cause**: The main thread gets stuck in blocking operations before it can check for signals:
+- Database operations in the polling loop (`cmd/crawler/crawler.go:239-250`)
+- Job queueing when channel is full (`jobs <- url` can block if workers are slow)
+- Long-running database transactions
+
+**Location**: `cmd/crawler/crawler.go` - main polling loop starting at line 233
+
+**Solution**: Add signal/context checking to blocking operations:
+- Use cancellable context instead of `context.Background()` for database operations
+- Make job queueing non-blocking or context-aware
+- Add timeout/cancellation to database operations
+
+### 2. fetchSnapshotsFromHistory() Doesn't Work with --skip-identical-content=true
+
+**Problem**: When `--skip-identical-content=true` (default), URLs with unchanged content get continuously re-queued.
+
+**Root Cause**: The function tracks when content last changed, not when URLs were last crawled:
+- Identical content → no new snapshot created
+- Query finds old snapshot timestamp → re-queues URL
+- Creates infinite loop of re-crawling unchanged content
+
+**Location**: `cmd/crawler/crawler.go:388-470` - `fetchSnapshotsFromHistory()` function
+
+**Solution Options**:
+1. Add `last_crawled` timestamp to URLs table
+2. Create separate `crawl_attempts` table  
+3. Always create snapshot entries (even for duplicates) but mark them as such
+4. Modify logic to work with existing schema constraints
+
+**Current Status**: Function assumes `SkipIdenticalContent=false` per original comment at line 391.

bin/gemget/main.go

@@ -1,47 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-
-	"gemini-grc/common/snapshot"
-	_url "gemini-grc/common/url"
-	"gemini-grc/config"
-	"gemini-grc/gemini"
-	"gemini-grc/gopher"
-	"gemini-grc/logging"
-	"github.com/antanst/go_errors"
-)
-
-func main() {
-	config.CONFIG = *config.GetConfig()
-	err := runApp()
-	if err != nil {
-		fmt.Printf("%v\n", err)
-		logging.LogError("%v", err)
-		os.Exit(1)
-	}
-}
-
-func runApp() error {
-	if len(os.Args) != 2 {
-		return go_errors.NewError(fmt.Errorf("missing URL to visit"))
-	}
-	url := os.Args[1]
-	var s *snapshot.Snapshot
-	var err error
-	if _url.IsGeminiUrl(url) {
-		s, err = gemini.Visit(url)
-	} else if _url.IsGopherURL(url) {
-		s, err = gopher.Visit(url)
-	} else {
-		return go_errors.NewFatalError(fmt.Errorf("not a Gemini or Gopher URL"))
-	}
-	if err != nil {
-		return err
-	}
-	_json, _ := json.MarshalIndent(s, "", "  ")
-	fmt.Printf("%s\n", _json)
-	return err
-}

bin/normalizeSnapshot/main.go

@@ -1,118 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-
-	"gemini-grc/common/snapshot"
-	"gemini-grc/common/url"
-	main2 "gemini-grc/db"
-	_ "github.com/jackc/pgx/v5/stdlib" // PGX driver for PostgreSQL
-	"github.com/jmoiron/sqlx"
-)
-
-// Populates the `host` field
-func main() {
-	db := connectToDB()
-	count := 0
-
-	for {
-		tx := db.MustBegin()
-		query := `
-        SELECT * FROM snapshots
-        ORDER BY id
-        LIMIT 10000 OFFSET $1
-    `
-		var snapshots []snapshot.Snapshot
-		err := tx.Select(&snapshots, query, count)
-		if err != nil {
-			printErrorAndExit(tx, err)
-		}
-		if len(snapshots) == 0 {
-			fmt.Println("Done!")
-			return
-		}
-		for _, s := range snapshots {
-			count++
-			escaped := url.EscapeURL(s.URL.String())
-			normalizedGeminiURL, err := url.ParseURL(escaped, "", true)
-			if err != nil {
-				fmt.Println(s.URL.String())
-				fmt.Println(escaped)
-				printErrorAndExit(tx, err)
-			}
-			normalizedURLString := normalizedGeminiURL.String()
-			// If URL is already normalized, skip snapshot
-			if normalizedURLString == s.URL.String() {
-				// fmt.Printf("[%5d] Skipping %d %s\n", count, s.ID, s.URL.String())
-				continue
-			}
-			// If a snapshot already exists with the normalized
-			// URL, delete the current snapshot and leave the other.
-			var ss []snapshot.Snapshot
-			err = tx.Select(&ss, "SELECT * FROM snapshots WHERE URL=$1", normalizedURLString)
-			if err != nil {
-				printErrorAndExit(tx, err)
-			}
-			if len(ss) > 0 {
-				tx.MustExec("DELETE FROM snapshots WHERE id=$1", s.ID)
-				fmt.Printf("%d Deleting %d %s\n", count, s.ID, s.URL.String())
-				//err = tx.Commit()
-				//if err != nil {
-				//	printErrorAndExit(tx, err)
-				//}
-				//return
-				continue
-			}
-			// fmt.Printf("%s =>\n%s\n", s.URL.String(), normalizedURLString)
-			// At this point we just update the snapshot,
-			// and the normalized URL will be saved.
-			fmt.Printf("%d Updating %d %s => %s\n", count, s.ID, s.URL.String(), normalizedURLString)
-			// Saves the snapshot with the normalized URL
-			tx.MustExec("DELETE FROM snapshots WHERE id=$1", s.ID)
-			s.URL = *normalizedGeminiURL
-			err = main2.OverwriteSnapshot(tx, &s)
-			if err != nil {
-				printErrorAndExit(tx, err)
-			}
-			//err = tx.Commit()
-			//if err != nil {
-			//	printErrorAndExit(tx, err)
-			//}
-			//return
-		}
-		err = tx.Commit()
-		if err != nil {
-			printErrorAndExit(tx, err)
-		}
-	}
-}
-
-func printErrorAndExit(tx *sqlx.Tx, err error) {
-	_ = tx.Rollback()
-	panic(err)
-}
-
-func connectToDB() *sqlx.DB {
-	connStr := fmt.Sprintf("postgres://%s:%s@%s:%s/%s",
-		os.Getenv("PG_USER"),
-		os.Getenv("PG_PASSWORD"),
-		os.Getenv("PG_HOST"),
-		os.Getenv("PG_PORT"),
-		os.Getenv("PG_DATABASE"),
-	)
-
-	// Create a connection pool
-	db, err := sqlx.Open("pgx", connStr)
-	if err != nil {
-		panic(fmt.Sprintf("Unable to connect to database with URL %s: %v\n", connStr, err))
-	}
-	db.SetMaxOpenConns(20)
-	err = db.Ping()
-	if err != nil {
-		panic(fmt.Sprintf("Unable to ping database: %v\n", err))
-	}
-
-	fmt.Println("Connected to database")
-	return db
-}

cmd/crawler/crawler.go

@@ -0,0 +1,400 @@
+package main
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	"gemini-grc/common"
+	"gemini-grc/common/blackList"
+	"gemini-grc/common/contextlog"
+	"gemini-grc/common/seedList"
+	"gemini-grc/common/whiteList"
+	"gemini-grc/config"
+	"gemini-grc/contextutil"
+	gemdb "gemini-grc/db"
+	"gemini-grc/robotsMatch"
+	"gemini-grc/util"
+	"git.antanst.com/antanst/logging"
+	"github.com/jmoiron/sqlx"
+)
+
+var jobs chan string
+
+func main() {
+	var err error
+
+	err = initializeApp()
+	if err != nil {
+		handleUnexpectedError(err)
+	}
+
+	err = runApp()
+	if err != nil {
+		handleUnexpectedError(err)
+	}
+
+	err = shutdownApp()
+	if err != nil {
+		handleUnexpectedError(err)
+	}
+}
+
+func handleUnexpectedError(err error) {
+	logging.LogError("Unexpected error: %v", err)
+	_ = shutdownApp()
+	os.Exit(1)
+}
+
+func initializeApp() error {
+	config.CONFIG = *config.Initialize()
+	logging.InitSlogger(config.CONFIG.LogLevel)
+
+	logging.LogInfo("Starting up. Press Ctrl+C to exit")
+	common.SignalsChan = make(chan os.Signal, 1)
+	signal.Notify(common.SignalsChan, syscall.SIGINT, syscall.SIGTERM)
+	common.FatalErrorsChan = make(chan error)
+	jobs = make(chan string, config.CONFIG.NumOfWorkers)
+
+	var err error
+
+	err = blackList.Initialize()
+	if err != nil {
+		return err
+	}
+
+	err = whiteList.Initialize()
+	if err != nil {
+		return err
+	}
+
+	err = seedList.Initialize()
+	if err != nil {
+		return err
+	}
+
+	err = robotsMatch.Initialize()
+	if err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+	err = gemdb.Database.Initialize(ctx)
+	if err != nil {
+		return err
+	}
+
+	if config.CONFIG.SeedUrlPath != "" {
+		err := AddURLsFromFile(ctx, config.CONFIG.SeedUrlPath)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func shutdownApp() error {
+	var err error
+
+	err = blackList.Shutdown()
+	if err != nil {
+		return err
+	}
+
+	err = whiteList.Shutdown()
+	if err != nil {
+		return err
+	}
+
+	err = seedList.Shutdown()
+	if err != nil {
+		return err
+	}
+
+	err = robotsMatch.Shutdown()
+	if err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+	err = gemdb.Database.Shutdown(ctx)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func runApp() (err error) {
+	go spawnWorkers(config.CONFIG.NumOfWorkers)
+	go runJobScheduler()
+	for {
+		select {
+		case <-common.SignalsChan:
+			logging.LogWarn("Received SIGINT or SIGTERM signal, exiting")
+			return nil
+		case err := <-common.FatalErrorsChan:
+			return err
+		}
+	}
+}
+
+func spawnWorkers(total int) {
+	for id := 0; id < total; id++ {
+		go func(a int) {
+			for {
+				job := <-jobs
+				common.RunWorkerWithTx(a, job)
+			}
+		}(id)
+	}
+}
+
+// Current Logic Flow:
+//
+// 1. Create transaction
+// 2. Get distinct hosts
+// 3. If no hosts → fetch snapshots from history (adds URLs to queue)
+// 4. Re-query for hosts (should now have some)
+// 5. Get URLs from hosts
+// 6. Commit transaction
+// 7. Queue URLs for workers
+func runJobScheduler() {
+	var tx *sqlx.Tx
+	var err error
+
+	ctx := contextutil.ContextWithComponent(context.Background(), "crawler")
+	tx, err = gemdb.Database.NewTx(ctx)
+	if err != nil {
+		common.FatalErrorsChan <- err
+		return
+	}
+
+	defer func(tx *sqlx.Tx) {
+		if tx != nil {
+			if err := gemdb.SafeRollback(ctx, tx); err != nil {
+				common.FatalErrorsChan <- err
+			}
+		}
+	}(tx)
+
+	// First, check if the URLs table is empty.
+	var urlCount int
+
+	if config.CONFIG.GopherEnable {
+		err = tx.Get(&urlCount, "SELECT COUNT(*) FROM urls")
+	} else {
+		err = tx.Get(&urlCount, "SELECT COUNT(*) FROM urls WHERE url LIKE 'gemini://%'")
+	}
+	if err != nil {
+		common.FatalErrorsChan <- err
+		return
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		common.FatalErrorsChan <- err
+		return
+	}
+
+	// If no pending URLs, add the ones from the standard crawl set.
+	tx, err = gemdb.Database.NewTx(ctx)
+	if err != nil {
+		common.FatalErrorsChan <- err
+		return
+	}
+
+	if urlCount == 0 {
+		logging.LogInfo("URLs table is empty, enqueueing standard crawl set")
+		err = enqueueSeedURLs(ctx, tx)
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+		// Commit this tx here so the loop below sees the changes.
+		err := tx.Commit()
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+	} else {
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "Found %d pending URLs to crawl.", urlCount)
+	}
+
+	// Main job loop.
+	// We get URLs from the pending URLs table,
+	// add crawling jobs for those,
+	// and sleep a bit after each run.
+	for {
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Polling DB for jobs")
+
+		// Use fresh context for DB operations to avoid timeouts/cancellation
+		// from the long-lived scheduler context affecting database transactions
+		dbCtx := context.Background()
+		tx, err = gemdb.Database.NewTx(dbCtx)
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+
+		// Get all distinct hosts from pending URLs
+		distinctHosts, err := gemdb.Database.GetUrlHosts(dbCtx, tx)
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+
+		// When out of pending URLs, add some random ones.
+		if len(distinctHosts) == 0 {
+			// Queue random old URLs from history.
+			count, err := fetchSnapshotsFromHistory(dbCtx, tx, config.CONFIG.NumOfWorkers, config.CONFIG.SkipIfUpdatedDays)
+			if err != nil {
+				common.FatalErrorsChan <- err
+				return
+			}
+			if count == 0 {
+				contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "No work, waiting to poll DB...")
+				time.Sleep(120 * time.Second)
+				continue
+			}
+			distinctHosts, err = gemdb.Database.GetUrlHosts(dbCtx, tx)
+			if err != nil {
+				common.FatalErrorsChan <- err
+				return
+			}
+		}
+
+		// Get some URLs from each host, up to a limit
+		urls, err := gemdb.Database.GetRandomUrlsFromHosts(dbCtx, distinctHosts, config.CONFIG.NumOfWorkers, tx)
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+
+		err = tx.Commit()
+		if err != nil {
+			common.FatalErrorsChan <- err
+			return
+		}
+
+		if len(urls) == 0 {
+			contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "No work, waiting to poll DB...")
+			time.Sleep(120 * time.Second)
+			continue
+		}
+
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "%d urls to crawl", len(urls))
+
+		// Add jobs to WaitGroup before queuing
+		common.WorkerWG.Add(len(urls))
+
+		for _, url := range urls {
+			jobs <- url
+		}
+
+		// Wait for all workers to complete their jobs
+		common.WorkerWG.Wait()
+
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "All workers done. New scheduler run starts")
+		logging.LogInfo("")
+		logging.LogInfo("")
+	}
+}
+
+func enqueueSeedURLs(ctx context.Context, tx *sqlx.Tx) error {
+	// Get seed URLs from seedList module
+	//urls := seedList.GetSeedURLs()
+	//
+	//for _, url := range urls {
+	//	err := gemdb.Database.InsertURL(ctx, tx, url)
+	//	if err != nil {
+	//		return err
+	//	}
+	//}
+	return nil
+}
+
+func fetchSnapshotsFromHistory(ctx context.Context, tx *sqlx.Tx, num int, age int) (int, error) {
+	// Select <num> snapshots from snapshots table for recrawling
+	// Find URLs where the LATEST crawl attempt (via last_crawled) is at least <age> days old
+	// Uses last_crawled timestamp to track actual crawl attempts regardless of content changes
+	historyCtx := contextutil.ContextWithComponent(context.Background(), "fetchSnapshotsFromHistory")
+	contextlog.LogDebugWithContext(historyCtx, logging.GetSlogger(), "Looking for %d URLs whose latest crawl attempt is at least %d days old to recrawl", num, age)
+
+	// Calculate the cutoff date
+	cutoffDate := time.Now().AddDate(0, 0, -age)
+
+	// Use the query from db_queries.go to find URLs that need re-crawling
+
+	type SnapshotURL struct {
+		URL  string `db:"url"`
+		Host string `db:"host"`
+	}
+
+	// Execute the query
+	var snapshotURLs []SnapshotURL
+	err := tx.Select(&snapshotURLs, gemdb.SQL_FETCH_SNAPSHOTS_FROM_HISTORY, cutoffDate, num)
+	if err != nil {
+		return 0, err
+	}
+
+	if len(snapshotURLs) == 0 {
+		return 0, nil
+	}
+
+	// For each selected snapshot, add the URL to the urls table
+	insertCount := 0
+	for _, snapshot := range snapshotURLs {
+		err := gemdb.Database.InsertURL(ctx, tx, snapshot.URL)
+		if err != nil {
+			logging.LogError("Error inserting URL %s from old snapshot to queue: %v", snapshot.URL, err)
+			return 0, err
+		}
+		insertCount++
+	}
+
+	// Note: The transaction is committed by the caller (runJobScheduler),
+	// not here. This function is called as part of a larger transaction.
+	if insertCount > 0 {
+		contextlog.LogInfoWithContext(historyCtx, logging.GetSlogger(), "Added %d old URLs to recrawl queue", insertCount)
+	}
+
+	return insertCount, nil
+}
+
+func AddURLsFromFile(ctx context.Context, filepath string) error {
+	data, err := os.ReadFile(filepath)
+	if err != nil {
+		return err
+	}
+	lines := strings.Split(string(data), "\n")
+	urls := util.Filter(lines, func(url string) bool {
+		return strings.TrimSpace(url) != ""
+	})
+
+	// Create a context for database operations
+	tx, err := gemdb.Database.NewTx(ctx)
+	if err != nil {
+		return err
+	}
+
+	// Insert all the URLs
+	for _, url := range urls {
+		fileCtx := contextutil.ContextWithComponent(context.Background(), "AddURLsFromFile")
+		contextlog.LogInfoWithContext(fileCtx, logging.GetSlogger(), "Adding %s to queue", url)
+		err := gemdb.Database.InsertURL(ctx, tx, url)
+		if err != nil {
+			return err
+		}
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+	return nil
+}

common/blackList/blacklist.go

@@ -7,24 +7,38 @@ import (
 	"strings"
 
 	"gemini-grc/config"
-	"gemini-grc/logging"
-	"github.com/antanst/go_errors"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 )
 
-var Blacklist []regexp.Regexp //nolint:gochecknoglobals
+var blacklist []regexp.Regexp //nolint:gochecknoglobals
 
-func LoadBlacklist() error {
-	if config.CONFIG.BlacklistPath == "" {
+func Initialize() error {
+	var err error
+
+	// Initialize blacklist
+	if config.CONFIG.BlacklistPath != "" {
+		if err = loadBlacklist(config.CONFIG.BlacklistPath); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func loadBlacklist(filePath string) error {
+	if blacklist != nil {
 		return nil
 	}
-	if Blacklist == nil {
-		data, err := os.ReadFile(config.CONFIG.BlacklistPath)
+
+	data, err := os.ReadFile(filePath)
 	if err != nil {
-			Blacklist = []regexp.Regexp{}
-			return go_errors.NewError(fmt.Errorf("could not load Blacklist file: %w", err))
+		blacklist = []regexp.Regexp{}
+		return xerrors.NewError(fmt.Errorf("could not load blacklist file: %w", err), 0, "", true)
 	}
 
 	lines := strings.Split(string(data), "\n")
+	blacklist = []regexp.Regexp{}
 
 	for _, line := range lines {
 		if line == "" || strings.HasPrefix(line, "#") {
@@ -32,21 +46,25 @@ func LoadBlacklist() error {
 		}
 		regex, err := regexp.Compile(line)
 		if err != nil {
-				return go_errors.NewError(fmt.Errorf("could not compile Blacklist line %s: %w", line, err))
+			return xerrors.NewError(fmt.Errorf("could not compile blacklist line %s: %w", line, err), 0, "", true)
 		}
-			Blacklist = append(Blacklist, *regex)
-
+		blacklist = append(blacklist, *regex)
 	}
 
-		if len(lines) > 0 {
-			logging.LogInfo("Loaded %d blacklist entries", len(Blacklist))
-		}
+	if len(blacklist) > 0 {
+		logging.LogInfo("Loaded %d blacklist entries", len(blacklist))
 	}
+
 	return nil
 }
 
+func Shutdown() error {
+	return nil
+}
+
+// IsBlacklisted checks if the URL matches any blacklist pattern
 func IsBlacklisted(u string) bool {
-	for _, v := range Blacklist {
+	for _, v := range blacklist {
 		if v.MatchString(u) {
 			return true
 		}

common/blackList/blacklist_test.go

@@ -3,16 +3,17 @@ package blackList
 import (
 	"os"
 	"regexp"
+	"strings"
 	"testing"
 
 	"gemini-grc/config"
 )
 
 func TestIsBlacklisted(t *testing.T) {
-	// Save original blacklist to restore after test
-	originalBlacklist := Blacklist
+	// Save original blacklist and whitelist to restore after test
+	originalBlacklist := blacklist
 	defer func() {
-		Blacklist = originalBlacklist
+		blacklist = originalBlacklist
 	}()
 
 	tests := []struct {
@@ -24,7 +25,7 @@ func TestIsBlacklisted(t *testing.T) {
 		{
 			name: "empty blacklist",
 			setup: func() {
-				Blacklist = []regexp.Regexp{}
+				blacklist = []regexp.Regexp{}
 			},
 			url:      "https://example.com",
 			expected: false,
@@ -33,7 +34,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "exact hostname match",
 			setup: func() {
 				regex, _ := regexp.Compile(`example\.com`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "example.com",
 			expected: true,
@@ -42,7 +43,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "hostname in URL match",
 			setup: func() {
 				regex, _ := regexp.Compile(`example\.com`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://example.com/path",
 			expected: true,
@@ -51,7 +52,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "partial hostname match",
 			setup: func() {
 				regex, _ := regexp.Compile(`example\.com`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://safe-example.com",
 			expected: true,
@@ -60,7 +61,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "full URL match",
 			setup: func() {
 				regex, _ := regexp.Compile(`https://example\.com/bad-path`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://example.com/bad-path",
 			expected: true,
@@ -69,7 +70,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "path match",
 			setup: func() {
 				regex, _ := regexp.Compile("/malicious-path")
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://example.com/malicious-path",
 			expected: true,
@@ -78,7 +79,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "subdomain match with word boundary",
 			setup: func() {
 				regex, _ := regexp.Compile(`bad\.example\.com`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://bad.example.com/path",
 			expected: true,
@@ -89,7 +90,7 @@ func TestIsBlacklisted(t *testing.T) {
 				regex1, _ := regexp.Compile(`badsite\.com`)
 				regex2, _ := regexp.Compile(`malicious\.org`)
 				regex3, _ := regexp.Compile(`example\.com/sensitive`)
-				Blacklist = []regexp.Regexp{*regex1, *regex2, *regex3}
+				blacklist = []regexp.Regexp{*regex1, *regex2, *regex3}
 			},
 			url:      "https://example.com/sensitive/data",
 			expected: true,
@@ -100,7 +101,7 @@ func TestIsBlacklisted(t *testing.T) {
 				regex1, _ := regexp.Compile(`badsite\.com`)
 				regex2, _ := regexp.Compile(`malicious\.org`)
 				regex3, _ := regexp.Compile(`example\.com/sensitive`)
-				Blacklist = []regexp.Regexp{*regex1, *regex2, *regex3}
+				blacklist = []regexp.Regexp{*regex1, *regex2, *regex3}
 			},
 			url:      "https://example.com/safe/data",
 			expected: false,
@@ -109,7 +110,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "pattern with wildcard",
 			setup: func() {
 				regex, _ := regexp.Compile(`.*\.evil\.com`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://subdomain.evil.com/path",
 			expected: true,
@@ -118,7 +119,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "pattern with special characters",
 			setup: func() {
 				regex, _ := regexp.Compile(`example\.com/path\?id=[0-9]+`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://example.com/path?id=12345",
 			expected: true,
@@ -127,7 +128,7 @@ func TestIsBlacklisted(t *testing.T) {
 			name: "unicode character support",
 			setup: func() {
 				regex, _ := regexp.Compile(`example\.com/[\p{L}]+`)
-				Blacklist = []regexp.Regexp{*regex}
+				blacklist = []regexp.Regexp{*regex}
 			},
 			url:      "https://example.com/café",
 			expected: true,
@@ -145,12 +146,88 @@ func TestIsBlacklisted(t *testing.T) {
 	}
 }
 
-func TestLoadBlacklist(t *testing.T) {
-	// Save original blacklist to restore after test
-	originalBlacklist := Blacklist
+// TestBlacklistLoading tests that the blacklist loading logic works with a mock blacklist file
+func TestBlacklistLoading(t *testing.T) {
+	// Save original blacklist and config
+	originalBlacklist := blacklist
 	originalConfigPath := config.CONFIG.BlacklistPath
 	defer func() {
-		Blacklist = originalBlacklist
+		blacklist = originalBlacklist
+		config.CONFIG.BlacklistPath = originalConfigPath
+	}()
+
+	// Create a temporary blacklist file with known patterns
+	tmpFile, err := os.CreateTemp("", "mock-blacklist-*.txt")
+	if err != nil {
+		t.Fatalf("Failed to create temporary file: %v", err)
+	}
+	defer os.Remove(tmpFile.Name())
+
+	// Write some test patterns to the mock blacklist file
+	mockBlacklistContent := `# Mock blacklist file for testing
+/git/
+/.git/
+/cgit/
+gemini://git\..*$
+gemini://.*/git/.*
+gopher://.*/git/.*
+.*/(commit|blob|tree)/.*
+.*/[0-9a-f]{7,40}$
+`
+	if err := os.WriteFile(tmpFile.Name(), []byte(mockBlacklistContent), 0o644); err != nil {
+		t.Fatalf("Failed to write to temporary file: %v", err)
+	}
+
+	// Configure and load the mock blacklist
+	blacklist = nil
+	config.CONFIG.BlacklistPath = tmpFile.Name()
+	err = Initialize()
+	if err != nil {
+		t.Fatalf("Failed to load mock blacklist: %v", err)
+	}
+
+	// Count the number of non-comment, non-empty lines to verify loading
+	lineCount := 0
+	for _, line := range strings.Split(mockBlacklistContent, "\n") {
+		if line != "" && !strings.HasPrefix(line, "#") {
+			lineCount++
+		}
+	}
+
+	if len(blacklist) != lineCount {
+		t.Errorf("Expected %d patterns to be loaded, got %d", lineCount, len(blacklist))
+	}
+
+	// Verify some sample URLs against our known patterns
+	testURLs := []struct {
+		url      string
+		expected bool
+		desc     string
+	}{
+		{"gemini://example.com/git/repo", true, "git repository"},
+		{"gemini://git.example.com", true, "git subdomain"},
+		{"gemini://example.com/cgit/repo", true, "cgit repository"},
+		{"gemini://example.com/repo/commit/abc123", true, "git commit"},
+		{"gemini://example.com/123abc7", true, "commit hash at path end"},
+		{"gopher://example.com/1/git/repo", true, "gopher git repository"},
+		{"gemini://example.com/normal/page.gmi", false, "normal gemini page"},
+		{"gemini://example.com/project/123abc", false, "hash not at path end"},
+	}
+
+	for _, tt := range testURLs {
+		result := IsBlacklisted(tt.url)
+		if result != tt.expected {
+			t.Errorf("With mock blacklist, IsBlacklisted(%q) = %v, want %v", tt.url, result, tt.expected)
+		}
+	}
+}
+
+func TestLoadBlacklist(t *testing.T) {
+	// Save original blacklist to restore after test
+	originalBlacklist := blacklist
+	originalConfigPath := config.CONFIG.BlacklistPath
+	defer func() {
+		blacklist = originalBlacklist
 		config.CONFIG.BlacklistPath = originalConfigPath
 	}()
 
@@ -161,7 +238,7 @@ func TestLoadBlacklist(t *testing.T) {
 	}
 	defer os.Remove(tmpFile.Name())
 
-	// Test cases for LoadBlacklist
+	// Test cases for Initialize
 	tests := []struct {
 		name           string
 		blacklistLines []string
@@ -202,7 +279,7 @@ func TestLoadBlacklist(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			// Reset blacklist
-			Blacklist = nil
+			blacklist = nil
 
 			// Set config path
 			config.CONFIG.BlacklistPath = tt.configPath
@@ -219,29 +296,186 @@ func TestLoadBlacklist(t *testing.T) {
 			}
 
 			// Call the function
-			err := LoadBlacklist()
+			err := Initialize()
 
 			// Check results
 			if (err != nil) != tt.wantErr {
-				t.Errorf("LoadBlacklist() error = %v, wantErr %v", err, tt.wantErr)
+				t.Errorf("Initialize() error = %v, wantErr %v", err, tt.wantErr)
 				return
 			}
 
-			if !tt.wantErr && len(Blacklist) != tt.expectedLen {
-				t.Errorf("LoadBlacklist() loaded %d entries, want %d", len(Blacklist), tt.expectedLen)
+			if !tt.wantErr && len(blacklist) != tt.expectedLen {
+				t.Errorf("Initialize() loaded %d entries, want %d", len(blacklist), tt.expectedLen)
+			}
+		})
+	}
+}
+
+// TestGitPatterns tests the blacklist patterns specifically for Git repositories
+func TestGitPatterns(t *testing.T) {
+	// Save original blacklist to restore after test
+	originalBlacklist := blacklist
+	defer func() {
+		blacklist = originalBlacklist
+	}()
+
+	// Create patterns similar to those in the blacklist.txt file
+	patterns := []string{
+		"/git/",
+		"/.git/",
+		"/cgit/",
+		"/gitweb/",
+		"/gitea/",
+		"/scm/",
+		".*/(commit|blob|tree|tag|diff|blame|log|raw)/.*",
+		".*/(commits|objects|refs|branches|tags)/.*",
+		".*/[0-9a-f]{7,40}$",
+		"gemini://git\\..*$",
+		"gemini://.*/git/.*",
+		"gemini://.*\\.git/.*",
+		"gopher://.*/git/.*",
+	}
+
+	// Compile and set up the patterns
+	blacklist = []regexp.Regexp{}
+	for _, pattern := range patterns {
+		regex, err := regexp.Compile(pattern)
+		if err != nil {
+			t.Fatalf("Failed to compile pattern %q: %v", pattern, err)
+		}
+		blacklist = append(blacklist, *regex)
+	}
+
+	// Test URLs against git-related patterns
+	tests := []struct {
+		url      string
+		expected bool
+		desc     string
+	}{
+		// Git paths
+		{"gemini://example.com/git/", true, "basic git path"},
+		{"gemini://example.com/.git/", true, "hidden git path"},
+		{"gemini://example.com/cgit/", true, "cgit path"},
+		{"gemini://example.com/gitweb/", true, "gitweb path"},
+		{"gemini://example.com/gitea/", true, "gitea path"},
+		{"gemini://example.com/scm/", true, "scm path"},
+
+		// Git operations
+		{"gemini://example.com/repo/commit/abc123", true, "commit path"},
+		{"gemini://example.com/repo/blob/main/README.md", true, "blob path"},
+		{"gemini://example.com/repo/tree/master", true, "tree path"},
+		{"gemini://example.com/repo/tag/v1.0", true, "tag path"},
+
+		// Git internals
+		{"gemini://example.com/repo/commits/", true, "commits path"},
+		{"gemini://example.com/repo/objects/", true, "objects path"},
+		{"gemini://example.com/repo/refs/heads/main", true, "refs path"},
+
+		// Git hashes
+		{"gemini://example.com/commit/a1b2c3d", true, "short hash"},
+		{"gemini://example.com/commit/a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0", true, "long hash"},
+
+		// Git domains
+		{"gemini://git.example.com/", true, "git subdomain"},
+		{"gemini://example.com/git/repo", true, "git directory"},
+		{"gemini://example.com/project.git/", true, "git extension"},
+
+		// Gopher protocol
+		{"gopher://example.com/1/git/repo", true, "gopher git path"},
+
+		// Non-matching URLs
+		{"gemini://example.com/project/", false, "regular project path"},
+		{"gemini://example.com/blog/", false, "blog path"},
+		{"gemini://example.com/git-guide.gmi", false, "hyphenated word with git"},
+		{"gemini://example.com/digital/", false, "word containing 'git'"},
+		{"gemini://example.com/ab12cd3", true, "short hex string matches commit hash pattern"},
+		{"gemini://example.com/ab12cdz", false, "alphanumeric string with non-hex chars won't match commit hash"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			result := IsBlacklisted(tt.url)
+			if result != tt.expected {
+				t.Errorf("IsBlacklisted(%q) = %v, want %v", tt.url, result, tt.expected)
+			}
+		})
+	}
+}
+
+// TestGeminiGopherPatterns tests the blacklist patterns specific to Gemini and Gopher protocols
+func TestGeminiGopherPatterns(t *testing.T) {
+	// Save original blacklist to restore after test
+	originalBlacklist := blacklist
+	defer func() {
+		blacklist = originalBlacklist
+	}()
+
+	// Create patterns for Gemini and Gopher
+	patterns := []string{
+		"gemini://badhost\\.com",
+		"gemini://.*/cgi-bin/",
+		"gemini://.*/private/",
+		"gemini://.*\\.evil\\..*",
+		"gopher://badhost\\.org",
+		"gopher://.*/I/onlyfans/",
+		"gopher://.*/[0-9]/(cgi|bin)/",
+	}
+
+	// Compile and set up the patterns
+	blacklist = []regexp.Regexp{}
+	for _, pattern := range patterns {
+		regex, err := regexp.Compile(pattern)
+		if err != nil {
+			t.Fatalf("Failed to compile pattern %q: %v", pattern, err)
+		}
+		blacklist = append(blacklist, *regex)
+	}
+
+	// Test URLs against Gemini and Gopher patterns
+	tests := []struct {
+		url      string
+		expected bool
+		desc     string
+	}{
+		// Gemini URLs
+		{"gemini://badhost.com/", true, "blacklisted gemini host"},
+		{"gemini://badhost.com/page.gmi", true, "blacklisted gemini host with path"},
+		{"gemini://example.com/cgi-bin/script.cgi", true, "gemini cgi-bin path"},
+		{"gemini://example.com/private/docs", true, "gemini private path"},
+		{"gemini://subdomain.evil.org", true, "gemini evil domain pattern"},
+		{"gemini://example.com/public/docs", false, "safe gemini path"},
+		{"gemini://goodhost.com/", false, "safe gemini host"},
+
+		// Gopher URLs
+		{"gopher://badhost.org/1/menu", true, "blacklisted gopher host"},
+		{"gopher://example.org/I/onlyfans/image", true, "gopher onlyfans path"},
+		{"gopher://example.org/1/cgi/script", true, "gopher cgi path"},
+		{"gopher://example.org/1/bin/executable", true, "gopher bin path"},
+		{"gopher://example.org/0/text", false, "safe gopher text"},
+		{"gopher://goodhost.org/1/menu", false, "safe gopher host"},
+
+		// Protocol distinction
+		{"https://badhost.com/", false, "blacklisted host but wrong protocol"},
+		{"http://example.com/cgi-bin/script.cgi", false, "bad path but wrong protocol"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			result := IsBlacklisted(tt.url)
+			if result != tt.expected {
+				t.Errorf("IsBlacklisted(%q) = %v, want %v", tt.url, result, tt.expected)
 			}
 		})
 	}
 }
 
-// TestIsBlacklistedIntegration tests the integration between LoadBlacklist and IsBlacklisted
 func TestIsBlacklistedIntegration(t *testing.T) {
 	// Save original blacklist to restore after test
-	originalBlacklist := Blacklist
-	originalConfigPath := config.CONFIG.BlacklistPath
+	originalBlacklist := blacklist
+	originalBlacklistPath := config.CONFIG.BlacklistPath
 	defer func() {
-		Blacklist = originalBlacklist
-		config.CONFIG.BlacklistPath = originalConfigPath
+		blacklist = originalBlacklist
+		config.CONFIG.BlacklistPath = originalBlacklistPath
 	}()
 
 	// Create a temporary blacklist file for testing
@@ -264,12 +498,12 @@ malicious\.org
 	}
 
 	// Set up the test
-	Blacklist = nil
+	blacklist = nil
 	config.CONFIG.BlacklistPath = tmpFile.Name()
 
 	// Load the blacklist
-	if err := LoadBlacklist(); err != nil {
-		t.Fatalf("LoadBlacklist() failed: %v", err)
+	if err := Initialize(); err != nil {
+		t.Fatalf("Initialize() failed: %v", err)
 	}
 
 	// Test URLs against the loaded blacklist

common/contextlog/contextlog.go

@@ -0,0 +1,112 @@
+package contextlog
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"gemini-grc/contextutil"
+)
+
+// SlogEventWithContext adds context information as structured fields to the log event.
+func SlogEventWithContext(ctx context.Context, logger *slog.Logger) *slog.Logger {
+	// Start with the provided logger
+	if logger == nil {
+		// If logger isn't initialized, use the default logger
+		return slog.Default()
+	}
+
+	// Get context values - will be added directly to log records
+	host := contextutil.GetHostFromContext(ctx)
+	requestID := contextutil.GetRequestIDFromContext(ctx)
+	component := contextutil.GetComponentFromContext(ctx)
+	workerID := contextutil.GetWorkerIDFromContext(ctx)
+	url := contextutil.GetURLFromContext(ctx)
+
+	// Add all context fields to the logger
+	if host != "" {
+		logger = logger.With("host", host)
+	}
+
+	if requestID != "" {
+		logger = logger.With("request_id", requestID)
+	}
+
+	if workerID >= 0 {
+		logger = logger.With("worker_id", workerID)
+	}
+
+	if component != "" {
+		logger = logger.With("component", component)
+	}
+
+	if url != "" {
+		logger = logger.With("url", url)
+	}
+
+	return logger
+}
+
+// LogDebugWithContext logs a debug message with context information.
+func LogDebugWithContext(ctx context.Context, logger *slog.Logger, format string, args ...interface{}) {
+	if logger == nil {
+		return
+	}
+
+	// Create logger with context fields
+	contextLogger := SlogEventWithContext(ctx, logger)
+
+	// Format the message
+	message := fmt.Sprintf(format, args...)
+
+	// Log with context data in the record attributes
+	contextLogger.Debug(message)
+}
+
+// LogInfoWithContext logs an info message with context information.
+func LogInfoWithContext(ctx context.Context, logger *slog.Logger, format string, args ...interface{}) {
+	if logger == nil {
+		return
+	}
+
+	// Create logger with context fields
+	contextLogger := SlogEventWithContext(ctx, logger)
+
+	// Format the message
+	message := fmt.Sprintf(format, args...)
+
+	// Log with context data in the record attributes
+	contextLogger.Info(message)
+}
+
+// LogWarnWithContext logs a warning message with context information.
+func LogWarnWithContext(ctx context.Context, logger *slog.Logger, format string, args ...interface{}) {
+	if logger == nil {
+		return
+	}
+
+	// Create logger with context fields
+	contextLogger := SlogEventWithContext(ctx, logger)
+
+	// Format the message
+	message := fmt.Sprintf(format, args...)
+
+	// Log with context data in the record attributes
+	contextLogger.Warn(message)
+}
+
+// LogErrorWithContext logs an error message with context information
+func LogErrorWithContext(ctx context.Context, logger *slog.Logger, format string, args ...interface{}) {
+	if logger == nil {
+		return
+	}
+
+	// Create logger with context fields
+	contextLogger := SlogEventWithContext(ctx, logger)
+
+	// Format the message
+	msg := fmt.Sprintf(format, args...)
+
+	// Log with context data in the record attributes
+	contextLogger.Error(msg, slog.String("error", msg))
+}

common/errors/errors.go

@@ -1,41 +0,0 @@
-package errors
-
-import (
-	"fmt"
-
-	"github.com/antanst/go_errors"
-)
-
-// HostError is an error encountered while
-// visiting a host, and should be recorded
-// to the snapshot.
-type HostError struct {
-	Err error
-}
-
-func (e *HostError) Error() string {
-	return e.Err.Error()
-}
-
-func (e *HostError) Unwrap() error {
-	return e.Err
-}
-
-func NewHostError(err error) error {
-	return &HostError{Err: err}
-}
-
-func IsHostError(err error) bool {
-	if err == nil {
-		return false
-	}
-	var asError *HostError
-	return go_errors.As(err, &asError)
-}
-
-// Sentinel errors used for their string message primarily.
-// Do not use them by themselves, to be embedded to HostError.
-var (
-	ErrBlacklistMatch = fmt.Errorf("black list match")
-	ErrRobotsMatch    = fmt.Errorf("robots match")
-)

common/errors/hostError.go

@@ -0,0 +1,29 @@
+package commonErrors
+
+import (
+	"errors"
+
+	"git.antanst.com/antanst/xerrors"
+)
+
+type HostError struct {
+	xerrors.XError
+}
+
+func IsHostError(err error) bool {
+	var temp *HostError
+	return errors.As(err, &temp)
+}
+
+func NewHostError(err error) error {
+	xerr := xerrors.XError{
+		UserMsg: "",
+		Code:    0,
+		Err:     err,
+		IsFatal: false,
+	}
+
+	return &HostError{
+		xerr,
+	}
+}

common/errors/sentinelErrors.go

@@ -0,0 +1,8 @@
+package commonErrors
+
+import "fmt"
+
+var (
+	ErrBlacklistMatch = fmt.Errorf("black list match")
+	ErrRobotsMatch    = fmt.Errorf("robots match")
+)

common/linkList/linkList.go

@@ -10,8 +10,15 @@ import (
 
 type LinkList []url.URL
 
-func (l *LinkList) Value() (driver.Value, error) {
-	return json.Marshal(l)
+func (l LinkList) Value() (driver.Value, error) {
+	if len(l) == 0 {
+		return nil, nil
+	}
+	data, err := json.Marshal(l)
+	if err != nil {
+		return nil, err
+	}
+	return data, nil
 }
 
 func (l *LinkList) Scan(value interface{}) error {
@@ -19,7 +26,7 @@ func (l *LinkList) Scan(value interface{}) error {
 		*l = nil
 		return nil
 	}
-	b, ok := value.([]byte) // Type assertion! Converts to []byte
+	b, ok := value.([]byte)
 	if !ok {
 		return fmt.Errorf("failed to scan LinkList: expected []byte, got %T", value)
 	}

common/seedList/seedlist.go

@@ -0,0 +1,67 @@
+package seedList
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
+)
+
+var seedlist []string //nolint:gochecknoglobals
+
+func Initialize() error {
+	var err error
+
+	// Initialize seedlist from fixed path
+	if err = loadSeedlist("seed_urls.txt"); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func loadSeedlist(filePath string) error {
+	if seedlist != nil {
+		return nil
+	}
+
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		seedlist = []string{}
+		return xerrors.NewError(fmt.Errorf("could not load seedlist file: %w", err), 0, "", true)
+	}
+
+	lines := strings.Split(string(data), "\n")
+	seedlist = []string{}
+
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		seedlist = append(seedlist, line)
+	}
+
+	if len(seedlist) > 0 {
+		logging.LogInfo("Loaded %d seed URLs", len(seedlist))
+	}
+
+	return nil
+}
+
+func Shutdown() error {
+	return nil
+}
+
+// GetSeedURLs returns the list of seed URLs
+func GetSeedURLs() []string {
+	if seedlist == nil {
+		return []string{}
+	}
+	// Return a copy to prevent external modification
+	result := make([]string, len(seedlist))
+	copy(result, seedlist)
+	return result
+}

common/seedList/seedlist_test.go

@@ -0,0 +1,67 @@
+package seedList
+
+import (
+	"os"
+	"testing"
+)
+
+func TestLoadSeedlist(t *testing.T) {
+	// Create a temporary test file
+	content := `# Test seed URLs
+gemini://example.com/
+gemini://test.com/
+
+# Another comment
+gemini://demo.org/`
+
+	tmpFile, err := os.CreateTemp("", "seed_urls_test_*.txt")
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+	defer os.Remove(tmpFile.Name())
+
+	if _, err := tmpFile.WriteString(content); err != nil {
+		t.Fatalf("Failed to write to temp file: %v", err)
+	}
+	tmpFile.Close()
+
+	// Reset global variable for test
+	seedlist = nil
+
+	// Test loading
+	err = loadSeedlist(tmpFile.Name())
+	if err != nil {
+		t.Fatalf("Failed to load seedlist: %v", err)
+	}
+
+	// Verify content
+	expected := []string{
+		"gemini://example.com/",
+		"gemini://test.com/",
+		"gemini://demo.org/",
+	}
+
+	urls := GetSeedURLs()
+	if len(urls) != len(expected) {
+		t.Errorf("Expected %d URLs, got %d", len(expected), len(urls))
+	}
+
+	for i, url := range urls {
+		if url != expected[i] {
+			t.Errorf("Expected URL %d to be %s, got %s", i, expected[i], url)
+		}
+	}
+}
+
+func TestGetSeedURLsEmptyList(t *testing.T) {
+	// Reset global variable
+	originalSeedlist := seedlist
+	defer func() { seedlist = originalSeedlist }()
+
+	seedlist = nil
+
+	urls := GetSeedURLs()
+	if len(urls) != 0 {
+		t.Errorf("Expected empty list, got %d URLs", len(urls))
+	}
+}

common/shared.go

@@ -1,11 +1,17 @@
 package common
 
+import (
+	"os"
+	"sync"
+)
+
+// FatalErrorsChan accepts errors from workers.
+// In case of fatal error, gracefully
+// exits the application.
 var (
-	StatusChan chan WorkerStatus
-	// ErrorsChan accepts errors from workers.
-	// In case of fatal error, gracefully
-	// exits the application.
-	ErrorsChan chan error
+	FatalErrorsChan chan error
+	SignalsChan     chan os.Signal
+	WorkerWG        sync.WaitGroup
 )
 
 const VERSION string = "0.0.1"

common/snapshot/snapshot.go

@@ -5,12 +5,12 @@ import (
 
 	"gemini-grc/common/linkList"
 	commonUrl "gemini-grc/common/url"
-	"github.com/antanst/go_errors"
+	"git.antanst.com/antanst/xerrors"
 	"github.com/guregu/null/v5"
 )
 
 type Snapshot struct {
-	ID           int                           `db:"ID" json:"ID,omitempty"`
+	ID           int                           `db:"id" json:"ID,omitempty"`
 	URL          commonUrl.URL                 `db:"url" json:"url,omitempty"`
 	Host         string                        `db:"host" json:"host,omitempty"`
 	Timestamp    null.Time                     `db:"timestamp" json:"timestamp,omitempty"`
@@ -22,12 +22,13 @@ type Snapshot struct {
 	Lang         null.String                   `db:"lang" json:"lang,omitempty"`
 	ResponseCode null.Int                      `db:"response_code" json:"code,omitempty"`        // Gemini response Status code.
 	Error        null.String                   `db:"error" json:"error,omitempty"`               // On network errors only
+	LastCrawled  null.Time                     `db:"last_crawled" json:"last_crawled,omitempty"` // When URL was last processed (regardless of content changes)
 }
 
 func SnapshotFromURL(u string, normalize bool) (*Snapshot, error) {
 	url, err := commonUrl.ParseURL(u, "", normalize)
 	if err != nil {
-		return nil, go_errors.NewError(err)
+		return nil, xerrors.NewSimpleError(err)
 	}
 	newSnapshot := Snapshot{
 		URL:       *url,

common/url/url.go

@@ -9,7 +9,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/antanst/go_errors"
+	"git.antanst.com/antanst/xerrors"
 )
 
 type URL struct {
@@ -29,7 +29,7 @@ func (u *URL) Scan(value interface{}) error {
 	}
 	b, ok := value.(string)
 	if !ok {
-		return go_errors.NewFatalError(fmt.Errorf("database scan error: expected string, got %T", value))
+		return xerrors.NewError(fmt.Errorf("database scan error: expected string, got %T", value), 0, "", true)
 	}
 	parsedURL, err := ParseURL(b, "", false)
 	if err != nil {
@@ -82,7 +82,7 @@ func ParseURL(input string, descr string, normalize bool) (*URL, error) {
 	} else {
 		u, err = url.Parse(input)
 		if err != nil {
-			return nil, go_errors.NewError(fmt.Errorf("error parsing URL: %w: %s", err, input))
+			return nil, xerrors.NewError(fmt.Errorf("error parsing URL: %w: %s", err, input), 0, "", false)
 		}
 	}
 	protocol := u.Scheme
@@ -99,7 +99,7 @@ func ParseURL(input string, descr string, normalize bool) (*URL, error) {
 	}
 	port, err := strconv.Atoi(strPort)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing URL: %w: %s", err, input))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing URL: %w: %s", err, input), 0, "", false)
 	}
 	full := fmt.Sprintf("%s://%s:%d%s", protocol, hostname, port, urlPath)
 	// full field should also contain query params and url fragments
@@ -145,13 +145,13 @@ func NormalizeURL(rawURL string) (*url.URL, error) {
 	// Parse the URL
 	u, err := url.Parse(rawURL)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error normalizing URL: %w: %s", err, rawURL))
+		return nil, xerrors.NewError(fmt.Errorf("error normalizing URL: %w: %s", err, rawURL), 0, "", false)
 	}
 	if u.Scheme == "" {
-		return nil, go_errors.NewError(fmt.Errorf("error normalizing URL: No scheme: %s", rawURL))
+		return nil, xerrors.NewError(fmt.Errorf("error normalizing URL: No scheme: %s", rawURL), 0, "", false)
 	}
 	if u.Host == "" {
-		return nil, go_errors.NewError(fmt.Errorf("error normalizing URL: No host: %s", rawURL))
+		return nil, xerrors.NewError(fmt.Errorf("error normalizing URL: No host: %s", rawURL), 0, "", false)
 	}
 
 	// Convert scheme to lowercase
@@ -275,7 +275,7 @@ func ExtractRedirectTargetFromHeader(currentURL URL, input string) (*URL, error)
 	re := regexp.MustCompile(pattern)
 	matches := re.FindStringSubmatch(input)
 	if len(matches) < 2 {
-		return nil, go_errors.NewError(fmt.Errorf("error extracting redirect target from string %s", input))
+		return nil, xerrors.NewError(fmt.Errorf("error extracting redirect target from string %s", input), 0, "", false)
 	}
 	newURL, err := DeriveAbsoluteURL(currentURL, matches[1])
 	if err != nil {

common/url/url_test.go

@@ -117,7 +117,7 @@ func TestURLOperations(t *testing.T) {
 		}
 	})
 
-	t.Run("NormalizeURL", func(t *testing.T) {
+	t.Run("CheckAndUpdateNormalizedURL", func(t *testing.T) {
 		t.Parallel()
 
 		tests := []struct {

common/whiteList/whitelist.go

@@ -0,0 +1,74 @@
+package whiteList
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+
+	"gemini-grc/config"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
+)
+
+var whitelist []regexp.Regexp //nolint:gochecknoglobals
+
+func Initialize() error {
+	var err error
+
+	// Initialize whitelist
+	if config.CONFIG.WhitelistPath != "" {
+		if err = loadWhitelist(config.CONFIG.WhitelistPath); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func loadWhitelist(filePath string) error {
+	if whitelist != nil {
+		return nil
+	}
+
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		whitelist = []regexp.Regexp{}
+		return xerrors.NewError(fmt.Errorf("could not load whitelist file: %w", err), 0, "", true)
+	}
+
+	lines := strings.Split(string(data), "\n")
+	whitelist = []regexp.Regexp{}
+
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		regex, err := regexp.Compile(line)
+		if err != nil {
+			return xerrors.NewError(fmt.Errorf("could not compile whitelist line %s: %w", line, err), 0, "", true)
+		}
+		whitelist = append(whitelist, *regex)
+	}
+
+	if len(whitelist) > 0 {
+		logging.LogInfo("Loaded %d whitelist entries", len(whitelist))
+	}
+
+	return nil
+}
+
+func Shutdown() error {
+	return nil
+}
+
+// IsWhitelisted checks if the URL matches any whitelist pattern
+func IsWhitelisted(u string) bool {
+	for _, v := range whitelist {
+		if v.MatchString(u) {
+			return true
+		}
+	}
+	return false
+}

common/whiteList/whitelist_test.go

@@ -0,0 +1,87 @@
+package whiteList
+
+import (
+	"os"
+	"regexp"
+	"testing"
+
+	"gemini-grc/config"
+)
+
+func TestIsWhitelisted(t *testing.T) {
+	// Set up a test whitelist
+	whitelist = []regexp.Regexp{
+		*regexp.MustCompile(`^gemini://example\.com`),
+		*regexp.MustCompile(`^gemini://test\.org/path`),
+	}
+
+	testCases := []struct {
+		url      string
+		expected bool
+	}{
+		{"gemini://example.com", true},
+		{"gemini://example.com/path", true},
+		{"gemini://test.org", false},
+		{"gemini://test.org/path", true},
+		{"gemini://test.org/path/subpath", true},
+		{"gemini://other.site", false},
+	}
+
+	for _, tc := range testCases {
+		result := IsWhitelisted(tc.url)
+		if result != tc.expected {
+			t.Errorf("IsWhitelisted(%s) = %v, want %v", tc.url, result, tc.expected)
+		}
+	}
+}
+
+func TestLoadWhitelist(t *testing.T) {
+	// Create a temporary whitelist file
+	content := `# This is a test whitelist
+^gemini://example\.com
+^gemini://test\.org/path
+`
+	tmpfile, err := os.CreateTemp("", "whitelist")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	if _, err := tmpfile.Write([]byte(content)); err != nil {
+		t.Fatal(err)
+	}
+	if err := tmpfile.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	// Reset whitelist
+	whitelist = nil
+
+	// Set up configuration to use the temporary file
+	oldPath := config.CONFIG.WhitelistPath
+	config.CONFIG.WhitelistPath = tmpfile.Name()
+	defer func() {
+		config.CONFIG.WhitelistPath = oldPath
+	}()
+
+	// Load whitelist from the file
+	err = loadWhitelist(tmpfile.Name())
+	if err != nil {
+		t.Fatalf("loadWhitelist() error = %v", err)
+	}
+
+	// Check if whitelist was loaded correctly
+	if len(whitelist) != 2 {
+		t.Errorf("loadWhitelist() loaded %d entries, want 2", len(whitelist))
+	}
+
+	// Test a whitelisted URL
+	if !IsWhitelisted("gemini://example.com") {
+		t.Error("IsWhitelisted(\"gemini://example.com\") = false, want true")
+	}
+
+	// Test a URL in a whitelisted path
+	if !IsWhitelisted("gemini://test.org/path/subpage.gmi") {
+		t.Error("IsWhitelisted(\"gemini://test.org/path/subpage.gmi\") = false, want true")
+	}
+}

common/worker.go

@@ -1,201 +1,177 @@
 package common
 
 import (
+	"context"
+	"database/sql"
+	"errors"
 	"fmt"
 	"time"
 
 	"gemini-grc/common/blackList"
-	errors2 "gemini-grc/common/errors"
+	"gemini-grc/common/contextlog"
+	commonErrors "gemini-grc/common/errors"
 	"gemini-grc/common/snapshot"
 	url2 "gemini-grc/common/url"
-	_db "gemini-grc/db"
+	"gemini-grc/common/whiteList"
+	"gemini-grc/config"
+	"gemini-grc/contextutil"
+	gemdb "gemini-grc/db"
 	"gemini-grc/gemini"
 	"gemini-grc/gopher"
 	"gemini-grc/hostPool"
-	"gemini-grc/logging"
-	"github.com/antanst/go_errors"
+	"gemini-grc/robotsMatch"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 	"github.com/guregu/null/v5"
 	"github.com/jmoiron/sqlx"
 )
 
-func CrawlOneURL(db *sqlx.DB, url *string) error {
-	parsedURL, err := url2.ParseURL(*url, "", true)
+func RunWorkerWithTx(workerID int, job string) {
+	parsedURL, err := url2.ParseURL(job, "", true)
 	if err != nil {
-		return err
+		logging.LogInfo("Failed to parse URL: %s Error: %s", job, err)
+		return
+	}
+	host := parsedURL.Hostname
+
+	// Create a new worker context
+	baseCtx := context.Background()
+	ctx, cancel := contextutil.NewRequestContext(baseCtx, job, host, workerID)
+	ctx = contextutil.ContextWithComponent(ctx, "worker")
+	defer cancel() // Ensure the context is cancelled when we're done
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Starting worker for URL %s", job)
+
+	// Create a new db transaction
+	tx, err := gemdb.Database.NewTx(ctx)
+	if err != nil {
+		FatalErrorsChan <- err
+		return
 	}
 
-	if !url2.IsGeminiUrl(parsedURL.String()) && !url2.IsGopherURL(parsedURL.String()) {
-		return go_errors.NewError(fmt.Errorf("error parsing URL: not a Gemini or Gopher URL: %s", parsedURL.String()))
-	}
-
-	tx, err := db.Beginx()
+	err = runWorker(ctx, tx, []string{job})
+	WorkerWG.Done()
 	if err != nil {
-		return go_errors.NewFatalError(err)
+		// Two cases to handle:
+		// - context cancellation/timeout errors (log and ignore)
+		// - fatal errors (log and send to chan)
+		// non-fatal errors should've been handled within
+		// the runWorker() function and not bubble up here.
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+			contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Worker timed out or canceled: %v", err)
+			rollbackErr := gemdb.SafeRollback(ctx, tx)
+			if rollbackErr != nil {
+				FatalErrorsChan <- rollbackErr
+				return
 			}
-
-	err = _db.InsertURL(tx, parsedURL.Full)
-	if err != nil {
-		return err
+			return
+		} else if xerrors.IsFatal(err) {
+			contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Worker failed: %v", err)
+			rollbackErr := gemdb.SafeRollback(ctx, tx)
+			if rollbackErr != nil {
+				FatalErrorsChan <- rollbackErr
+				return
 			}
+			FatalErrorsChan <- err
+			return
 
-	err = workOnUrl(0, tx, parsedURL.Full)
-	if err != nil {
-		return err
+		}
+		contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Worker failed: %v", err)
+		rollbackErr := gemdb.SafeRollback(ctx, tx)
+		if rollbackErr != nil {
+			FatalErrorsChan <- rollbackErr
+			return
+		}
+		return
 	}
 
 	err = tx.Commit()
-	if err != nil {
-		//if _db.IsDeadlockError(err) {
-		//	logging.LogError("Deadlock detected. Rolling back")
-		//	time.Sleep(time.Duration(10) * time.Second)
-		//	err := tx.Rollback()
-		//	return go_errors.NewFatalError(err)
-		//}
-		return go_errors.NewFatalError(err)
-	}
-	logging.LogInfo("Done")
-	return nil
-}
-
-func SpawnWorkers(numOfWorkers int, db *sqlx.DB) {
-	logging.LogInfo("Spawning %d workers", numOfWorkers)
-	go PrintWorkerStatus(numOfWorkers, StatusChan)
-
-	for i := range numOfWorkers {
-		go func(i int) {
-			UpdateWorkerStatus(i, "Waiting to start")
-			// Jitter to avoid starting everything at the same time
-			time.Sleep(time.Duration(i+2) * time.Second)
-			for {
-				// TODO: Use cancellable context with tx, logger & worker ID.
-				// ctx := context.WithCancel()
-				// ctx = context.WithValue(ctx, common.CtxKeyLogger, &RequestLogger{r: r})
-				RunWorkerWithTx(i, db)
-			}
-		}(i)
-	}
-}
-
-func RunWorkerWithTx(workerID int, db *sqlx.DB) {
-	defer func() {
-		UpdateWorkerStatus(workerID, "Done")
-	}()
-
-	tx, err := db.Beginx()
-	if err != nil {
-		ErrorsChan <- err
+	if err != nil && !errors.Is(err, sql.ErrTxDone) {
+		contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Failed to commit transaction: %v", err)
+		if rollbackErr := gemdb.SafeRollback(ctx, tx); rollbackErr != nil {
+			FatalErrorsChan <- err
 			return
 		}
-
-	err = runWorker(workerID, tx)
-	if err != nil {
-		// TODO: Rollback in this case?
-		ErrorsChan <- err
-		return
 	}
-
-	logging.LogDebug("[%3d] Committing transaction", workerID)
-	err = tx.Commit()
-	// On deadlock errors, rollback and return, otherwise panic.
-	if err != nil {
-		logging.LogError("[%3d] Failed to commit transaction: %w", workerID, err)
-		if _db.IsDeadlockError(err) {
-			logging.LogError("[%3d] Deadlock detected. Rolling back", workerID)
-			time.Sleep(time.Duration(10) * time.Second)
-			err := tx.Rollback()
-			if err != nil {
-				panic(fmt.Sprintf("[%3d] Failed to roll back transaction: %v", workerID, err))
-			}
-			return
-		}
-		panic(fmt.Sprintf("[%3d] Failed to commit transaction: %v", workerID, err))
-	}
-	logging.LogDebug("[%3d] Worker done!", workerID)
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Worker done.")
 }
 
-func runWorker(workerID int, tx *sqlx.Tx) error {
-	var urls []string
-	var err error
-
-	UpdateWorkerStatus(workerID, "Getting URLs from DB")
-	urls, err = _db.GetRandomUrls(tx)
-	// urls, err = _db.GetRandomUrlsWithBasePath(tx)
-	if err != nil {
-		return err
-	} else if len(urls) == 0 {
-		logging.LogInfo("[%3d] No URLs to visit, sleeping...", workerID)
-		UpdateWorkerStatus(workerID, "No URLs to visit, sleeping...")
-		time.Sleep(1 * time.Minute)
-		return nil
-	}
-
-	// Start visiting URLs.
-	total := len(urls)
-	for i, u := range urls {
-		logging.LogInfo("[%3d] Starting %d/%d %s", workerID, i+1, total, u)
-		UpdateWorkerStatus(workerID, fmt.Sprintf("Starting %d/%d %s", i+1, total, u))
-		err := workOnUrl(workerID, tx, u)
+func runWorker(ctx context.Context, tx *sqlx.Tx, urls []string) error {
+	for _, u := range urls {
+		err := WorkOnUrl(ctx, tx, u)
 		if err != nil {
 			return err
 		}
-		logging.LogDebug("[%3d] Done %d/%d.", workerID, i+1, total)
-		UpdateWorkerStatus(workerID, fmt.Sprintf("Done %d/%d %s", i+1, total, u))
 	}
 	return nil
 }
 
-// workOnUrl visits a URL and stores the result.
+// WorkOnUrl visits a URL and stores the result.
 // unexpected errors are returned.
 // expected errors are stored within the snapshot.
-func workOnUrl(workerID int, tx *sqlx.Tx, url string) (err error) {
-	s, err := snapshot.SnapshotFromURL(url, false)
+func WorkOnUrl(ctx context.Context, tx *sqlx.Tx, url string) (err error) {
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Worker visiting URL %s", url)
+
+	s, err := snapshot.SnapshotFromURL(url, true)
 	if err != nil {
 		return err
 	}
 
+	// We always use the normalized URL
+	if url != s.URL.Full {
+		url = s.URL.Full
+	}
+
 	isGemini := url2.IsGeminiUrl(s.URL.String())
 	isGopher := url2.IsGopherURL(s.URL.String())
+
 	if !isGemini && !isGopher {
-		return go_errors.NewError(fmt.Errorf("not a Gopher or Gemini URL: %s", s.URL.String()))
+		return xerrors.NewSimpleError(fmt.Errorf("not a Gopher or Gemini URL: %s", s.URL.String()))
 	}
 
-	if blackList.IsBlacklisted(s.URL.String()) {
-		logging.LogInfo("[%3d] URL matches blacklist, ignoring", workerID)
-		s.Error = null.StringFrom(errors2.ErrBlacklistMatch.Error())
-		return saveSnapshotAndRemoveURL(tx, s)
+	if isGopher && !config.CONFIG.GopherEnable {
+		return xerrors.NewSimpleError(fmt.Errorf("gopher disabled, not processing Gopher URL: %s", s.URL.String()))
 	}
 
-	if isGemini {
+	// Check if URL is whitelisted
+	isUrlWhitelisted := whiteList.IsWhitelisted(s.URL.String())
+	if isUrlWhitelisted {
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "URL matches whitelist, forcing crawl %s", url)
+	}
+
+	// Only check blacklist if URL is not whitelisted
+	if !isUrlWhitelisted && blackList.IsBlacklisted(s.URL.String()) {
+		s.Error = null.StringFrom(commonErrors.ErrBlacklistMatch.Error())
+		return saveSnapshotAndRemoveURL(ctx, tx, s)
+	}
+
+	// Only check robots.txt if URL is not whitelisted and is a Gemini URL
+	var robotMatch bool
+	if !isUrlWhitelisted && isGemini {
 		// If URL matches a robots.txt disallow line,
 		// add it as an error and remove url
-		robotMatch, err := gemini.RobotMatch(s.URL.String())
+		robotMatch = robotsMatch.RobotMatch(ctx, s.URL.String())
+		if robotMatch {
+			s.Error = null.StringFrom(commonErrors.ErrRobotsMatch.Error())
+			return saveSnapshotAndRemoveURL(ctx, tx, s)
+		}
+	}
+
+	err = hostPool.AddHostToHostPool(ctx, s.Host)
 	if err != nil {
-			// robotMatch returns only network errors!
-			// we stop because we don't want to hit
-			// the server with another request on this case.
 		return err
 	}
-		if robotMatch {
-			logging.LogInfo("[%3d] URL matches robots.txt, ignoring", workerID)
-			s.Error = null.StringFrom(errors2.ErrRobotsMatch.Error())
-			return saveSnapshotAndRemoveURL(tx, s)
-		}
-	}
 
-	logging.LogDebug("[%3d] Adding to pool %s", workerID, s.URL.String())
-	UpdateWorkerStatus(workerID, fmt.Sprintf("Adding to pool %s", s.URL.String()))
-	hostPool.AddHostToHostPool(s.Host)
-	defer func(s string) {
-		hostPool.RemoveHostFromPool(s)
-	}(s.Host)
+	defer func(ctx context.Context, host string) {
+		hostPool.RemoveHostFromPool(ctx, host)
+	}(ctx, s.Host)
 
-	logging.LogDebug("[%3d] Visiting %s", workerID, s.URL.String())
-	UpdateWorkerStatus(workerID, fmt.Sprintf("Visiting %s", s.URL.String()))
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Visiting %s", s.URL.String())
 
+	// Use context-aware visits for both protocols
 	if isGopher {
-		s, err = gopher.Visit(s.URL.String())
+		s, err = gopher.VisitWithContext(ctx, s.URL.String())
 	} else {
-		s, err = gemini.Visit(s.URL.String())
+		s, err = gemini.Visit(ctx, s.URL.String())
 	}
 
 	if err != nil {
@@ -206,115 +182,213 @@ func workOnUrl(workerID int, tx *sqlx.Tx, url string) (err error) {
 	if isGemini &&
 		s.ResponseCode.ValueOrZero() >= 30 &&
 		s.ResponseCode.ValueOrZero() < 40 {
-		err = handleRedirection(workerID, tx, s)
+		err = saveRedirectURL(ctx, tx, s)
 		if err != nil {
-			return fmt.Errorf("error while handling redirection: %s", err)
+			return xerrors.NewSimpleError(fmt.Errorf("error while handling redirection: %s", err))
 		}
 	}
 
-	// Store links
+	// Check if we should skip a potentially
+	// identical snapshot with one from history
+	isIdentical, err := isContentIdentical(ctx, tx, s)
+	if err != nil {
+		return err
+	}
+	if isIdentical {
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "Content identical to existing snapshot, updating crawl timestamp")
+		// Update the last_crawled timestamp to track that we processed this URL
+		err = gemdb.Database.UpdateLastCrawled(ctx, tx, s.URL.String())
+		if err != nil {
+			return err
+		}
+		return removeURL(ctx, tx, s.URL.String())
+	}
+
+	// Process and store links since content has changed
 	if len(s.Links.ValueOrZero()) > 0 {
-		logging.LogDebug("[%3d] Found %d links", workerID, len(s.Links.ValueOrZero()))
-		err = storeLinks(tx, s)
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Found %d links", len(s.Links.ValueOrZero()))
+		err = storeLinks(ctx, tx, s)
 		if err != nil {
 			return err
 		}
 	}
 
-	logging.LogInfo("[%3d] %2d %s", workerID, s.ResponseCode.ValueOrZero(), s.URL.String())
-	return saveSnapshotAndRemoveURL(tx, s)
+	return saveSnapshotAndRemoveURL(ctx, tx, s)
 }
 
-func storeLinks(tx *sqlx.Tx, s *snapshot.Snapshot) error {
-	if s.Links.Valid { //nolint:nestif
-		for _, link := range s.Links.ValueOrZero() {
-			if shouldPersistURL(&link) {
-				visited, err := haveWeVisitedURL(tx, link.Full)
+func shouldUpdateSnapshotData(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) (bool, error) {
+	// If we don't have an error, save the new snapshot.
+	if !s.Error.Valid {
+		return true, nil
+	}
+	prevSnapshot, err := gemdb.Database.GetLatestSnapshot(ctx, tx, s.URL.String())
 	if err != nil {
-					return err
+		return false, err
 	}
-				if !visited {
-					err := _db.InsertURL(tx, link.Full)
-					if err != nil {
-						return err
+	// If we don't have a previous snapshot, save it anyway.
+	if prevSnapshot == nil {
+		return true, nil
 	}
-				} else {
-					logging.LogDebug("Link already persisted: %s", link.Full)
-				}
-			}
-		}
-	}
-	return nil
-}
-
-func saveSnapshotAndRemoveURL(tx *sqlx.Tx, s *snapshot.Snapshot) error {
-	err := _db.OverwriteSnapshot(tx, s)
-	if err != nil {
-		return err
-	}
-	err = _db.DeleteURL(tx, s.URL.String())
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-// shouldPersistURL returns true if we
-// should save the URL in the _db.
-// Only gemini:// urls are saved.
-func shouldPersistURL(u *url2.URL) bool {
-	return url2.IsGeminiUrl(u.String()) || url2.IsGopherURL(u.String())
-}
-
-func haveWeVisitedURL(tx *sqlx.Tx, u string) (bool, error) {
-	var result []bool
-	err := tx.Select(&result, `SELECT TRUE FROM urls WHERE url=$1`, u)
-	if err != nil {
-		return false, go_errors.NewFatalError(fmt.Errorf("database error: %w", err))
-	}
-	if len(result) > 0 {
-		return result[0], nil
-	}
-	err = tx.Select(&result, `SELECT TRUE FROM snapshots WHERE snapshots.url=$1`, u)
-	if err != nil {
-		return false, go_errors.NewFatalError(fmt.Errorf("database error: %w", err))
-	}
-	if len(result) > 0 {
-		return result[0], nil
+	// If we have a previous snapshot,
+	// and it didn't have an error, save.
+	// This means that we can have a max
+	// of one consecutive snapshot with
+	// an error.
+	if prevSnapshot.Error.ValueOrZero() == "" {
+		return true, nil
 	}
 	return false, nil
 }
 
-// handleRedirection saves redirection URL.
-func handleRedirection(workerID int, tx *sqlx.Tx, s *snapshot.Snapshot) error {
-	newURL, err := url2.ExtractRedirectTargetFromHeader(s.URL, s.Error.ValueOrZero())
+func isContentIdentical(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) (bool, error) {
+	// Always check if content is identical to previous snapshot
+	identical, err := gemdb.Database.IsContentIdentical(ctx, tx, s)
 	if err != nil {
-		return err
+		return false, err
 	}
-	logging.LogDebug("[%3d] Page redirects to %s", workerID, newURL)
+	return identical, nil
+}
 
-	haveWeVisited, _ := haveWeVisitedURL(tx, newURL.String())
-	if shouldPersistURL(newURL) && !haveWeVisited {
-		err = _db.InsertURL(tx, newURL.Full)
+// storeLinks checks and stores the snapshot links in the database.
+func storeLinks(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error {
+	if s.Links.Valid { //nolint:nestif
+		for _, link := range s.Links.ValueOrZero() {
+			if shouldPersistURL(&link) {
+				visited, err := haveWeVisitedURL(ctx, tx, link.Full)
 				if err != nil {
 					return err
 				}
-		logging.LogDebug("[%3d] Saved redirection URL %s", workerID, newURL.String())
+				if !visited {
+					err := gemdb.Database.InsertURL(ctx, tx, link.Full)
+					if err != nil {
+						return err
+					}
+				} else {
+					contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Link already persisted: %s", link.Full)
+				}
+			}
+		}
 	}
 	return nil
 }
 
-func GetSnapshotFromURL(tx *sqlx.Tx, url string) ([]snapshot.Snapshot, error) {
-	query := `
-	SELECT *
-	FROM snapshots
-	WHERE url=$1
-	LIMIT 1
-	`
-	var snapshots []snapshot.Snapshot
-	err := tx.Select(&snapshots, query, url)
-	if err != nil {
-		return nil, err
-	}
-	return snapshots, nil
+func removeURL(ctx context.Context, tx *sqlx.Tx, url string) error {
+	return gemdb.Database.DeleteURL(ctx, tx, url)
 }
+
+func saveSnapshotAndRemoveURL(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error {
+	shouldUpdateSnapshot, err := shouldUpdateSnapshotData(ctx, tx, s)
+	if err != nil {
+		return err
+	}
+	if shouldUpdateSnapshot {
+		err := gemdb.Database.SaveSnapshot(ctx, tx, s)
+		if err != nil {
+			return err
+		}
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "%2d", s.ResponseCode.ValueOrZero())
+		return removeURL(ctx, tx, s.URL.String())
+	} else {
+		contextlog.LogInfoWithContext(ctx, logging.GetSlogger(), "%2d %s (updating crawl date)", s.ResponseCode.ValueOrZero(), s.Error.ValueOrZero())
+		err = gemdb.Database.UpdateLastCrawled(ctx, tx, s.URL.String())
+		if err != nil {
+			return err
+		}
+		return removeURL(ctx, tx, s.URL.String())
+	}
+}
+
+// shouldPersistURL returns true given URL is a
+// non-blacklisted Gemini or Gopher URL.
+func shouldPersistURL(u *url2.URL) bool {
+	if blackList.IsBlacklisted(u.String()) {
+		return false
+	}
+	if config.CONFIG.GopherEnable && url2.IsGopherURL(u.String()) {
+		return true
+	}
+	return url2.IsGeminiUrl(u.String())
+}
+
+func haveWeVisitedURL(ctx context.Context, tx *sqlx.Tx, u string) (bool, error) {
+	var result []bool
+
+	// Check if the context is cancelled
+	if err := ctx.Err(); err != nil {
+		return false, xerrors.NewSimpleError(err)
+	}
+
+	// Check the urls table which holds the crawl queue.
+	err := tx.SelectContext(ctx, &result, `SELECT TRUE FROM urls WHERE url=$1`, u)
+	if err != nil {
+		return false, xerrors.NewError(fmt.Errorf("database error: %w", err), 0, "", true)
+	}
+	if len(result) > 0 {
+		return false, nil
+	}
+
+	// If we're skipping URLs based on recent updates, check if this URL has been
+	// crawled within the specified number of days
+	if config.CONFIG.SkipIfUpdatedDays > 0 {
+		var recentSnapshots []bool
+		cutoffDate := time.Now().AddDate(0, 0, -config.CONFIG.SkipIfUpdatedDays)
+
+		// Check if the context is cancelled
+		if err := ctx.Err(); err != nil {
+			return false, err
+		}
+
+		err = tx.SelectContext(ctx, &recentSnapshots, `
+			SELECT TRUE FROM snapshots
+			WHERE snapshots.url=$1
+			AND timestamp > $2
+			LIMIT 1`, u, cutoffDate)
+		if err != nil {
+			return false, xerrors.NewError(fmt.Errorf("database error checking recent snapshots: %w", err), 0, "", true)
+		}
+
+		if len(recentSnapshots) > 0 {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+func saveRedirectURL(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error {
+	newURL, err := url2.ExtractRedirectTargetFromHeader(s.URL, s.Header.ValueOrZero())
+	if err != nil {
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Failed to extract redirect target: %v", err)
+		return err
+	}
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Page redirects to %s", newURL)
+
+	haveWeVisited, err := haveWeVisitedURL(ctx, tx, newURL.String())
+	if err != nil {
+		return err
+	}
+
+	if shouldPersistURL(newURL) && !haveWeVisited {
+		err = gemdb.Database.InsertURL(ctx, tx, newURL.Full)
+		if err != nil {
+			return err
+		}
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Saved redirection URL %s", newURL.String())
+	}
+	return nil
+}
+
+//func GetSnapshotFromURL(tx *sqlx.Tx, url string) ([]snapshot.Snapshot, error) {
+//	query := `
+//	SELECT *
+//	FROM snapshots
+//	WHERE url=$1
+//	LIMIT 1
+//	`
+//	var snapshots []snapshot.Snapshot
+//	err := tx.Select(&snapshots, query, url)
+//	if err != nil {
+//		return nil, err
+//	}
+//	return snapshots, nil
+//}

common/workerStatus.go

@@ -1,70 +0,0 @@
-package common
-
-import (
-	"fmt"
-	"strings"
-
-	"gemini-grc/config"
-)
-
-type WorkerStatus struct {
-	ID     int
-	Status string
-}
-
-func UpdateWorkerStatus(workerID int, status string) {
-	if !config.GetConfig().PrintWorkerStatus {
-		return
-	}
-	if config.CONFIG.NumOfWorkers > 1 {
-		StatusChan <- WorkerStatus{
-			ID:     workerID,
-			Status: status,
-		}
-	}
-}
-
-func PrintWorkerStatus(totalWorkers int, statusChan chan WorkerStatus) {
-	if !config.GetConfig().PrintWorkerStatus {
-		return
-	}
-
-	// Create a slice to store current Status of each worker
-	statuses := make([]string, totalWorkers)
-
-	// Initialize empty statuses
-	for i := range statuses {
-		statuses[i] = ""
-	}
-
-	// Initial print
-	var output strings.Builder
-	// \033[H moves the cursor to the top left corner of the screen
-	// (ie, the first column of the first row in the screen).
-	// \033[J clears the part of the screen from the cursor to the end of the screen.
-	output.WriteString("\033[H\033[J") // Clear screen and move cursor to top
-	for i := range statuses {
-		output.WriteString(fmt.Sprintf("[%2d] \n", i))
-	}
-	fmt.Print(output.String())
-
-	// Continuously receive Status updates
-	for update := range statusChan {
-		if update.ID >= totalWorkers {
-			continue
-		}
-
-		// Update the Status
-		statuses[update.ID] = update.Status
-
-		// Build the complete output string
-		output.Reset()
-		output.WriteString("\033[H\033[J") // Clear screen and move cursor to top
-		for i, status := range statuses {
-			output.WriteString(fmt.Sprintf("[%2d] %.100s\n", i, status))
-		}
-
-		// Print the entire Status
-		fmt.Print(output.String())
-	}
-}

config/config.go

@@ -1,166 +1,90 @@
 package config
 
 import (
+	"flag"
 	"fmt"
+	"log/slog"
 	"os"
-	"strconv"
-
-	"github.com/rs/zerolog"
-)
-
-// Environment variable names.
-const (
-	EnvLogLevel               = "LOG_LEVEL"
-	EnvNumWorkers             = "NUM_OF_WORKERS"
-	EnvWorkerBatchSize        = "WORKER_BATCH_SIZE"
-	EnvMaxResponseSize        = "MAX_RESPONSE_SIZE"
-	EnvResponseTimeout        = "RESPONSE_TIMEOUT"
-	EnvPanicOnUnexpectedError = "PANIC_ON_UNEXPECTED_ERROR"
-	EnvBlacklistPath          = "BLACKLIST_PATH"
-	EnvDryRun                 = "DRY_RUN"
-	EnvPrintWorkerStatus      = "PRINT_WORKER_STATUS"
 )
 
 // Config holds the application configuration loaded from environment variables.
 type Config struct {
-	LogLevel               zerolog.Level // Logging level (debug, info, warn, error)
+	PgURL             string
+	LogLevel          slog.Level // Logging level (debug, info, warn, error)
 	MaxResponseSize   int        // Maximum size of response in bytes
+	MaxDbConnections  int        // Maximum number of database connections.
 	NumOfWorkers      int        // Number of concurrent workers
 	ResponseTimeout   int        // Timeout for responses in seconds
-	WorkerBatchSize        int           // Batch size for worker processing
-	PanicOnUnexpectedError bool          // Panic on unexpected errors when visiting a URL
 	BlacklistPath     string     // File that has blacklisted strings of "host:port"
+	WhitelistPath     string     // File with URLs that should always be crawled regardless of blacklist
 	DryRun            bool       // If false, don't write to disk
-	PrintWorkerStatus      bool          // If false, don't print worker status table
+	GopherEnable      bool       // Enable Gopher crawling
+	SeedUrlPath       string     // Add URLs from file to queue
+	SkipIfUpdatedDays int        // Skip re-crawling URLs updated within this many days (0 to disable)
 }
 
 var CONFIG Config //nolint:gochecknoglobals
 
-// parsePositiveInt parses and validates positive integer values.
-func parsePositiveInt(param, value string) (int, error) {
-	val, err := strconv.Atoi(value)
-	if err != nil {
-		return 0, ValidationError{
-			Param:  param,
-			Value:  value,
-			Reason: "must be a valid integer",
-		}
-	}
-	if val <= 0 {
-		return 0, ValidationError{
-			Param:  param,
-			Value:  value,
-			Reason: "must be positive",
-		}
-	}
-	return val, nil
-}
-
-func parseBool(param, value string) (bool, error) {
-	val, err := strconv.ParseBool(value)
-	if err != nil {
-		return false, ValidationError{
-			Param:  param,
-			Value:  value,
-			Reason: "cannot be converted to boolean",
-		}
-	}
-	return val, nil
-}
-
-// GetConfig loads and validates configuration from environment variables
-func GetConfig() *Config {
+// Initialize loads and validates configuration from environment variables
+func Initialize() *Config {
 	config := &Config{}
 
-	// Map of environment variables to their parsing functions
-	parsers := map[string]func(string) error{
-		EnvLogLevel: func(v string) error {
-			level, err := zerolog.ParseLevel(v)
+	loglevel := flag.String("log-level", "info", "Logging level (debug, info, warn, error)")
+	pgURL := flag.String("pgurl", "", "Postgres URL")
+	dryRun := flag.Bool("dry-run", false, "Dry run mode")
+	gopherEnable := flag.Bool("gopher", false, "Enable crawling of Gopher holes")
+	maxDbConnections := flag.Int("max-db-connections", 100, "Maximum number of database connections")
+	numOfWorkers := flag.Int("workers", 1, "Number of concurrent workers")
+	maxResponseSize := flag.Int("max-response-size", 1024*1024, "Maximum size of response in bytes")
+	responseTimeout := flag.Int("response-timeout", 10, "Timeout for network responses in seconds")
+	blacklistPath := flag.String("blacklist-path", "", "File that has blacklist regexes")
+	skipIfUpdatedDays := flag.Int("skip-if-updated-days", 60, "Skip re-crawling URLs updated within this many days (0 to disable)")
+	whitelistPath := flag.String("whitelist-path", "", "File with URLs that should always be crawled regardless of blacklist")
+	seedUrlPath := flag.String("seed-url-path", "", "File with seed URLs that should be added to the queue immediatelly")
+
+	flag.Parse()
+
+	config.PgURL = *pgURL
+	config.DryRun = *dryRun
+	config.GopherEnable = *gopherEnable
+	config.NumOfWorkers = *numOfWorkers
+	config.MaxResponseSize = *maxResponseSize
+	config.ResponseTimeout = *responseTimeout
+	config.BlacklistPath = *blacklistPath
+	config.WhitelistPath = *whitelistPath
+	config.SeedUrlPath = *seedUrlPath
+	config.MaxDbConnections = *maxDbConnections
+	config.SkipIfUpdatedDays = *skipIfUpdatedDays
+
+	level, err := ParseSlogLevel(*loglevel)
 	if err != nil {
-				return ValidationError{
-					Param:  EnvLogLevel,
-					Value:  v,
-					Reason: "must be one of: debug, info, warn, error",
-				}
+		_, _ = fmt.Fprint(os.Stderr, err.Error())
+		os.Exit(-1)
 	}
 	config.LogLevel = level
-			return nil
-		},
-		EnvNumWorkers: func(v string) error {
-			val, err := parsePositiveInt(EnvNumWorkers, v)
-			if err != nil {
-				return err
-			}
-			config.NumOfWorkers = val
-			return nil
-		},
-		EnvWorkerBatchSize: func(v string) error {
-			val, err := parsePositiveInt(EnvWorkerBatchSize, v)
-			if err != nil {
-				return err
-			}
-			config.WorkerBatchSize = val
-			return nil
-		},
-		EnvMaxResponseSize: func(v string) error {
-			val, err := parsePositiveInt(EnvMaxResponseSize, v)
-			if err != nil {
-				return err
-			}
-			config.MaxResponseSize = val
-			return nil
-		},
-		EnvResponseTimeout: func(v string) error {
-			val, err := parsePositiveInt(EnvResponseTimeout, v)
-			if err != nil {
-				return err
-			}
-			config.ResponseTimeout = val
-			return nil
-		},
-		EnvPanicOnUnexpectedError: func(v string) error {
-			val, err := parseBool(EnvPanicOnUnexpectedError, v)
-			if err != nil {
-				return err
-			}
-			config.PanicOnUnexpectedError = val
-			return nil
-		},
-		EnvBlacklistPath: func(v string) error {
-			config.BlacklistPath = v
-			return nil
-		},
-		EnvDryRun: func(v string) error {
-			val, err := parseBool(EnvDryRun, v)
-			if err != nil {
-				return err
-			}
-			config.DryRun = val
-			return nil
-		},
-		EnvPrintWorkerStatus: func(v string) error {
-			val, err := parseBool(EnvPrintWorkerStatus, v)
-			if err != nil {
-				return err
-			}
-			config.PrintWorkerStatus = val
-			return nil
-		},
-	}
-
-	// Process each environment variable
-	for envVar, parser := range parsers {
-		value, ok := os.LookupEnv(envVar)
-		if !ok {
-			fmt.Fprintf(os.Stderr, "Missing required environment variable: %s\n", envVar)
-			os.Exit(1)
-		}
-
-		if err := parser(value); err != nil {
-			fmt.Fprintf(os.Stderr, "Configuration error: %v\n", err)
-			os.Exit(1)
-		}
-	}
 
 	return config
 }
+
+// ParseSlogLevel converts a string level to slog.Level
+func ParseSlogLevel(levelStr string) (slog.Level, error) {
+	switch levelStr {
+	case "debug":
+		return slog.LevelDebug, nil
+	case "info":
+		return slog.LevelInfo, nil
+	case "warn":
+		return slog.LevelWarn, nil
+	case "error":
+		return slog.LevelError, nil
+	default:
+		return slog.LevelInfo, fmt.Errorf("invalid log level: %s", levelStr)
+	}
+}
+
+// Convert method for backward compatibility with existing codebase
+// This can be removed once all references to Convert() are updated
+func (c *Config) Convert() *Config {
+	// Just return the config itself as it now directly contains slog.Level
+	return c
+}

config/errors.go

@@ -1,14 +0,0 @@
-package config
-
-import "fmt"
-
-// ValidationError represents a config validation error
-type ValidationError struct {
-	Param  string
-	Value  string
-	Reason string
-}
-
-func (e ValidationError) Error() string {
-	return fmt.Sprintf("invalid value '%s' for %s: %s", e.Value, e.Param, e.Reason)
-}

contextutil/context.go

@@ -0,0 +1,89 @@
+package contextutil
+
+import (
+	"context"
+	"time"
+
+	"git.antanst.com/antanst/uid"
+)
+
+// ContextKey type for context values
+type ContextKey string
+
+// Context keys
+const (
+	CtxKeyURL       ContextKey = "url"        // Full URL being processed
+	CtxKeyHost      ContextKey = "host"       // Host of the URL
+	CtxKeyRequestID ContextKey = "request_id" // Unique ID for this processing request
+	CtxKeyWorkerID  ContextKey = "worker_id"  // Worker ID processing this request
+	CtxKeyStartTime ContextKey = "start_time" // When processing started
+	CtxKeyComponent ContextKey = "component"  // Component name for logging
+)
+
+// NewRequestContext creates a new, cancellable context
+// with a timeout and
+func NewRequestContext(parentCtx context.Context, url string, host string, workerID int) (context.Context, context.CancelFunc) {
+	ctx, cancel := context.WithTimeout(parentCtx, 120*time.Second)
+	requestID := uid.UID()
+	ctx = context.WithValue(ctx, CtxKeyURL, url)
+	ctx = context.WithValue(ctx, CtxKeyHost, host)
+	ctx = context.WithValue(ctx, CtxKeyRequestID, requestID)
+	ctx = context.WithValue(ctx, CtxKeyWorkerID, workerID)
+	ctx = context.WithValue(ctx, CtxKeyStartTime, time.Now())
+	return ctx, cancel
+}
+
+// Helper functions to get values from context
+
+// GetURLFromContext retrieves the URL from the context
+func GetURLFromContext(ctx context.Context) string {
+	if url, ok := ctx.Value(CtxKeyURL).(string); ok {
+		return url
+	}
+	return ""
+}
+
+// GetHostFromContext retrieves the host from the context
+func GetHostFromContext(ctx context.Context) string {
+	if host, ok := ctx.Value(CtxKeyHost).(string); ok {
+		return host
+	}
+	return ""
+}
+
+// GetRequestIDFromContext retrieves the request ID from the context
+func GetRequestIDFromContext(ctx context.Context) string {
+	if id, ok := ctx.Value(CtxKeyRequestID).(string); ok {
+		return id
+	}
+	return ""
+}
+
+// GetWorkerIDFromContext retrieves the worker ID from the context
+func GetWorkerIDFromContext(ctx context.Context) int {
+	if id, ok := ctx.Value(CtxKeyWorkerID).(int); ok {
+		return id
+	}
+	return -1
+}
+
+// GetStartTimeFromContext retrieves the start time from the context
+func GetStartTimeFromContext(ctx context.Context) time.Time {
+	if startTime, ok := ctx.Value(CtxKeyStartTime).(time.Time); ok {
+		return startTime
+	}
+	return time.Time{}
+}
+
+// GetComponentFromContext retrieves the component name from the context
+func GetComponentFromContext(ctx context.Context) string {
+	if component, ok := ctx.Value(CtxKeyComponent).(string); ok {
+		return component
+	}
+	return ""
+}
+
+// ContextWithComponent adds or updates the component name in the context
+func ContextWithComponent(ctx context.Context, component string) context.Context {
+	return context.WithValue(ctx, CtxKeyComponent, component)
+}

db/db.go

@@ -1,87 +1,187 @@
 package db
 
 import (
+	"bytes"
+	"context"
+	"database/sql"
 	"encoding/json"
+	"errors"
 	"fmt"
-	"os"
-	"strconv"
+	"strings"
+	"sync"
 	"time"
 
+	"gemini-grc/common/contextlog"
 	"gemini-grc/common/snapshot"
 	commonUrl "gemini-grc/common/url"
 	"gemini-grc/config"
-	"gemini-grc/logging"
-	"github.com/antanst/go_errors"
+	"gemini-grc/contextutil"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
+	"github.com/guregu/null/v5"
 	_ "github.com/jackc/pgx/v5/stdlib" // PGX driver for PostgreSQL
 	"github.com/jmoiron/sqlx"
 	"github.com/lib/pq"
 )
 
-func ConnectToDB() (*sqlx.DB, error) {
-	connStr := fmt.Sprintf("postgres://%s:%s@%s:%s/%s", //nolint:nosprintfhostport
-		os.Getenv("PG_USER"),
-		os.Getenv("PG_PASSWORD"),
-		os.Getenv("PG_HOST"),
-		os.Getenv("PG_PORT"),
-		os.Getenv("PG_DATABASE"),
-	)
+type DbService interface {
+	// Core database methods
+	Initialize(ctx context.Context) error
+	Shutdown(ctx context.Context) error
+	NewTx(ctx context.Context) (*sqlx.Tx, error)
 
-	// Create a connection pool
-	db, err := sqlx.Open("pgx", connStr)
-	if err != nil {
-		return nil, go_errors.NewFatalError(fmt.Errorf("unable to connect to database with URL %s: %w", connStr, err))
-	}
-	// TODO move PG_MAX_OPEN_CONNECTIONS to config env variables
-	maxConnections, err := strconv.Atoi(os.Getenv("PG_MAX_OPEN_CONNECTIONS"))
-	if err != nil {
-		return nil, go_errors.NewFatalError(fmt.Errorf("unable to set DB max connections: %w", err))
-	}
-	db.SetMaxOpenConns(maxConnections)
-	err = db.Ping()
-	if err != nil {
-		return nil, go_errors.NewFatalError(fmt.Errorf("unable to ping database: %w", err))
-	}
+	// URL methods
+	InsertURL(ctx context.Context, tx *sqlx.Tx, url string) error
+	CheckAndUpdateNormalizedURL(ctx context.Context, tx *sqlx.Tx, url string, normalizedURL string) error
+	DeleteURL(ctx context.Context, tx *sqlx.Tx, url string) error
+	MarkURLsAsBeingProcessed(ctx context.Context, tx *sqlx.Tx, urls []string) error
+	GetUrlHosts(ctx context.Context, tx *sqlx.Tx) ([]string, error)
+	GetRandomUrlsFromHosts(ctx context.Context, hosts []string, limit int, tx *sqlx.Tx) ([]string, error)
 
-	logging.LogDebug("Connected to database")
-	return db, nil
+	// Snapshot methods
+	SaveSnapshot(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error
+	OverwriteSnapshot(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error
+	UpdateLastCrawled(ctx context.Context, tx *sqlx.Tx, url string) error
+	GetLatestSnapshot(ctx context.Context, tx *sqlx.Tx, url string) (*snapshot.Snapshot, error)
+	GetSnapshotAtTimestamp(ctx context.Context, tx *sqlx.Tx, url string, timestamp time.Time) (*snapshot.Snapshot, error)
+	GetAllSnapshotsForURL(ctx context.Context, tx *sqlx.Tx, url string) ([]*snapshot.Snapshot, error)
+	GetSnapshotsByDateRange(ctx context.Context, tx *sqlx.Tx, url string, startTime, endTime time.Time) ([]*snapshot.Snapshot, error)
+	IsContentIdentical(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) (bool, error)
 }
 
+type DbServiceImpl struct {
+	db        *sqlx.DB
+	connected bool
+
+	mu sync.Mutex
+}
+
+var Database DbServiceImpl
+
 // IsDeadlockError checks if the error is a PostgreSQL deadlock error.
 func IsDeadlockError(err error) bool {
-	err = go_errors.Unwrap(err)
+	err = errors.Unwrap(err)
 	var pqErr *pq.Error
-	if go_errors.As(err, &pqErr) {
+	if errors.As(err, &pqErr) {
 		return pqErr.Code == "40P01" // PostgreSQL deadlock error code
 	}
 	return false
 }
 
-func GetRandomUrls(tx *sqlx.Tx) ([]string, error) {
-	var urls []string
-	err := tx.Select(&urls, SQL_SELECT_RANDOM_URLS, config.CONFIG.WorkerBatchSize)
-	if err != nil {
-		return nil, go_errors.NewFatalError(err)
+// Initialize initializes the database with context
+func (d *DbServiceImpl) Initialize(ctx context.Context) error {
+	// Create a database-specific context
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Initializing database connection")
+
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
+	if d.connected {
+		return nil
 	}
-	return urls, nil
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Create a connection pool
+	connStr := config.CONFIG.PgURL
+	db, err := sqlx.Open("pgx", connStr)
+	if err != nil {
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Unable to connect to database with URL %s: %v", connStr, err)
+		return xerrors.NewError(fmt.Errorf("unable to connect to database with URL %s: %w", connStr, err), 0, "", true)
+	}
+
+	// Configure connection pool
+	db.SetMaxOpenConns(config.CONFIG.MaxDbConnections)
+	db.SetMaxIdleConns(config.CONFIG.MaxDbConnections / 2)
+	db.SetConnMaxLifetime(time.Minute * 5)
+	db.SetConnMaxIdleTime(time.Minute * 1)
+
+	// Check if the context is cancelled before proceeding with ping
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Use PingContext for context-aware ping
+	err = db.PingContext(ctx)
+	if err != nil {
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Unable to ping database: %v", err)
+		return xerrors.NewError(fmt.Errorf("unable to ping database: %w", err), 0, "", true)
+	}
+
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Database connection initialized successfully")
+	d.db = db
+	d.connected = true
+	return nil
 }
 
-func GetRandomUrlsWithBasePath(tx *sqlx.Tx) ([]string, error) {
-	SqlQuery := `SELECT url FROM snapshots WHERE url ~ '^[^:]+://[^/]+/?$' ORDER BY RANDOM() LIMIT $1`
-	var urls []string
-	err := tx.Select(&urls, SqlQuery, config.CONFIG.WorkerBatchSize)
+func (d *DbServiceImpl) Shutdown(ctx context.Context) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Shutting down database connections")
+	_, err := d.db.Query("UPDATE urls SET being_processed=false")
 	if err != nil {
-		return nil, go_errors.NewFatalError(err)
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Unable to update urls table: %v", err)
 	}
-	return urls, nil
+
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
+	if !d.connected {
+		return nil
+	}
+
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	err = d.db.Close()
+	if err != nil {
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Error closing database connection: %v", err)
+	} else {
+		contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Database connection closed successfully")
+		d.connected = false
+	}
+	return err
 }
 
-func InsertURL(tx *sqlx.Tx, url string) error {
-	logging.LogDebug("Inserting URL %s", url)
-	query := SQL_INSERT_URL
+// NewTx creates a new transaction with context
+func (d *DbServiceImpl) NewTx(ctx context.Context) (*sqlx.Tx, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Context error before creating transaction: %v", err)
+		return nil, err
+	}
+
+	tx, err := d.db.BeginTxx(ctx, nil)
+	if err != nil {
+		contextlog.LogErrorWithContext(dbCtx, logging.GetSlogger(), "Failed to create transaction: %v", err)
+		return nil, err
+	}
+
+	return tx, nil
+}
+
+// InsertURL inserts a URL with context
+func (d *DbServiceImpl) InsertURL(ctx context.Context, tx *sqlx.Tx, url string) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Inserting URL %s", url)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Context-aware implementation
 	normalizedURL, err := commonUrl.ParseURL(url, "", true)
 	if err != nil {
 		return err
 	}
+
 	a := struct {
 		Url       string
 		Host      string
@@ -91,50 +191,378 @@ func InsertURL(tx *sqlx.Tx, url string) error {
 		Host:      normalizedURL.Hostname,
 		Timestamp: time.Now(),
 	}
-	_, err = tx.NamedExec(query, a)
+
+	query := SQL_INSERT_URL
+	_, err = tx.NamedExecContext(ctx, query, a)
 	if err != nil {
-		return go_errors.NewFatalError(fmt.Errorf("cannot insert URL: database error %w URL %s", err, url))
+		return xerrors.NewError(fmt.Errorf("cannot insert URL: database error %w URL %s", err, url), 0, "", true)
 	}
 	return nil
 }
 
-func DeleteURL(tx *sqlx.Tx, url string) error {
-	logging.LogDebug("Deleting URL %s", url)
+// NormalizeURL normalizes a URL with context
+func (d *DbServiceImpl) CheckAndUpdateNormalizedURL(ctx context.Context, tx *sqlx.Tx, url string, normalizedURL string) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+
+	// Check if URLs are already the same
+	if url == normalizedURL {
+		return nil
+	}
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Updating normalized URL %s -> %s", url, normalizedURL)
+
+	query := SQL_UPDATE_URL
+	a := struct {
+		Url           string `db:"Url"`
+		NormalizedURL string `db:"NormalizedURL"`
+	}{
+		Url:           url,
+		NormalizedURL: normalizedURL,
+	}
+	_, err := tx.NamedExecContext(ctx, query, a)
+	if err != nil {
+		return xerrors.NewError(fmt.Errorf("cannot update normalized URL: %w URL %s", err, url), 0, "", true)
+	}
+	return nil
+}
+
+// DeleteURL deletes a URL with context
+func (d *DbServiceImpl) DeleteURL(ctx context.Context, tx *sqlx.Tx, url string) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Deleting URL %s", url)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Context-aware implementation
 	query := SQL_DELETE_URL
-	_, err := tx.Exec(query, url)
+	_, err := tx.ExecContext(ctx, query, url)
 	if err != nil {
-		return go_errors.NewFatalError(fmt.Errorf("cannot delete URL: database error %w URL %s", err, url))
+		return xerrors.NewError(fmt.Errorf("cannot delete URL: database error %w URL %s", err, url), 0, "", true)
 	}
 	return nil
 }
 
-func OverwriteSnapshot(tx *sqlx.Tx, s *snapshot.Snapshot) (err error) {
+// MarkURLsAsBeingProcessed marks URLs as being processed with context
+func (d *DbServiceImpl) MarkURLsAsBeingProcessed(ctx context.Context, tx *sqlx.Tx, urls []string) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+
+	// Skip if no URLs provided
+	if len(urls) == 0 {
+		return nil
+	}
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Marking %d URLs as being processed", len(urls))
+
+	// Context-aware implementation
+	if len(urls) > 0 {
+		// Build a query with multiple parameters instead of using pq.Array
+		placeholders := make([]string, len(urls))
+		args := make([]interface{}, len(urls))
+		for i, url := range urls {
+			placeholders[i] = fmt.Sprintf("$%d", i+1)
+			args[i] = url
+		}
+		query := fmt.Sprintf(SQL_MARK_URLS_BEING_PROCESSED, strings.Join(placeholders, ","))
+		_, err := tx.ExecContext(ctx, query, args...)
+		if err != nil {
+			return xerrors.NewError(fmt.Errorf("cannot mark URLs as being processed: %w", err), 0, "", true)
+		}
+	}
+	return nil
+}
+
+// GetUrlHosts gets URL hosts with context
+func (d *DbServiceImpl) GetUrlHosts(ctx context.Context, tx *sqlx.Tx) ([]string, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting URL hosts")
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	var hosts []string
+	var query string
+	if config.CONFIG.GopherEnable {
+		query = "SELECT DISTINCT(host) FROM urls WHERE being_processed IS NOT TRUE"
+	} else {
+		query = "SELECT DISTINCT(host) FROM urls WHERE url like 'gemini://%' AND being_processed IS NOT TRUE"
+	}
+	err := tx.SelectContext(ctx, &hosts, query)
+	if err != nil {
+		return nil, xerrors.NewError(err, 0, "", true)
+	}
+	return hosts, nil
+}
+
+// GetRandomUrlsFromHosts gets random URLs from hosts with context
+func (d *DbServiceImpl) GetRandomUrlsFromHosts(ctx context.Context, hosts []string, limit int, tx *sqlx.Tx) ([]string, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting random URLs from %d hosts with limit %d", len(hosts), limit)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	var urls []string
+	var query string
+	for _, host := range hosts {
+		var results []string
+		if !config.CONFIG.GopherEnable {
+			query = "SELECT url FROM urls WHERE host=$1 AND url like 'gemini://%' AND being_processed IS NOT TRUE ORDER BY RANDOM() LIMIT $2"
+		} else {
+			query = "SELECT url FROM urls WHERE host=$1 AND being_processed IS NOT TRUE ORDER BY RANDOM() LIMIT $2"
+		}
+		err := tx.SelectContext(ctx, &results, query, host, limit)
+		if err != nil {
+			return nil, xerrors.NewError(err, 0, "", true)
+		}
+		urls = append(urls, results...)
+	}
+
+	// Check context cancellation before mark operation
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Use context-aware method for marking URLs
+	err := d.MarkURLsAsBeingProcessed(ctx, tx, urls)
+	if err != nil {
+		return nil, err
+	}
+	return urls, nil
+}
+
+// SaveSnapshot saves a snapshot with context
+func (d *DbServiceImpl) SaveSnapshot(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Saving snapshot for URL %s", s.URL.String())
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Context-aware implementation
 	if config.CONFIG.DryRun {
 		marshalled, err := json.MarshalIndent(s, "", "  ")
 		if err != nil {
-			return go_errors.NewFatalError(fmt.Errorf("JSON serialization error for %v", s))
+			return xerrors.NewError(fmt.Errorf("JSON serialization error for %v", s), 0, "", true)
 		}
-		logging.LogDebug("Would upsert snapshot %s", marshalled)
+		contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Would save snapshot %s", marshalled)
 		return nil
 	}
-	query := SQL_UPSERT_SNAPSHOT
-	rows, err := tx.NamedQuery(query, s)
+
+	// Check context before expensive operations
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Always ensure we have current timestamps
+	currentTime := time.Now()
+	s.Timestamp = null.TimeFrom(currentTime)
+	s.LastCrawled = null.TimeFrom(currentTime)
+
+	// For PostgreSQL, use the global sqlx.NamedQueryContext function
+	// The SQL_INSERT_SNAPSHOT already has a RETURNING id clause
+	query := SQL_INSERT_SNAPSHOT
+	rows, err := sqlx.NamedQueryContext(ctx, tx, query, s)
 	if err != nil {
-		return go_errors.NewFatalError(fmt.Errorf("cannot overwrite snapshot: %w", err))
+		return xerrors.NewError(fmt.Errorf("cannot save snapshot: %w", err), 0, "", true)
 	}
-	defer func() {
-		_err := rows.Close()
-		if err == nil && _err != nil {
-			err = go_errors.NewFatalError(fmt.Errorf("cannot overwrite snapshot: error closing rows: %w", err))
-		}
-	}()
+	defer rows.Close()
+
+	// Scan the returned ID
 	if rows.Next() {
-		var returnedID int
-		err = rows.Scan(&returnedID)
+		err = rows.Scan(&s.ID)
 		if err != nil {
-			return go_errors.NewFatalError(fmt.Errorf("cannot overwrite snapshot: error scanning rows: %w", err))
+			return xerrors.NewError(fmt.Errorf("cannot save snapshot: error scanning returned ID: %w", err), 0, "", true)
 		}
-		s.ID = returnedID
+	}
+	return nil
+}
+
+// OverwriteSnapshot overwrites a snapshot with context (maintained for backward compatibility)
+func (d *DbServiceImpl) OverwriteSnapshot(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Overwriting snapshot for URL %s", s.URL.String())
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Now simply delegate to SaveSnapshot which is already context-aware
+	return d.SaveSnapshot(ctx, tx, s)
+}
+
+// UpdateLastCrawled updates the last_crawled timestamp for the most recent snapshot of a URL
+func (d *DbServiceImpl) UpdateLastCrawled(ctx context.Context, tx *sqlx.Tx, url string) error {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Updating last_crawled timestamp for URL %s", url)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Update the last_crawled timestamp for the most recent snapshot
+	_, err := tx.ExecContext(ctx, SQL_UPDATE_LAST_CRAWLED, url)
+	if err != nil {
+		return xerrors.NewError(fmt.Errorf("cannot update last_crawled for URL %s: %w", url, err), 0, "", true)
+	}
+
+	return nil
+}
+
+// GetLatestSnapshot gets the latest snapshot with context
+func (d *DbServiceImpl) GetLatestSnapshot(ctx context.Context, tx *sqlx.Tx, url string) (*snapshot.Snapshot, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting latest snapshot for URL %s", url)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	s := &snapshot.Snapshot{}
+	err := tx.GetContext(ctx, s, SQL_GET_LATEST_SNAPSHOT, url)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, xerrors.NewError(fmt.Errorf("cannot get latest snapshot for URL %s: %w", url, err), 0, "", true)
+	}
+	return s, nil
+}
+
+// GetSnapshotAtTimestamp gets a snapshot at a specific timestamp with context
+func (d *DbServiceImpl) GetSnapshotAtTimestamp(ctx context.Context, tx *sqlx.Tx, url string, timestamp time.Time) (*snapshot.Snapshot, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting snapshot for URL %s at timestamp %v", url, timestamp)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	s := &snapshot.Snapshot{}
+	err := tx.GetContext(ctx, s, SQL_GET_SNAPSHOT_AT_TIMESTAMP, url, timestamp)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, xerrors.NewError(fmt.Errorf("no snapshot found for URL %s at or before %v", url, timestamp), 0, "", false)
+		}
+		return nil, xerrors.NewError(fmt.Errorf("cannot get snapshot for URL %s at timestamp %v: %w", url, timestamp, err), 0, "", false)
+	}
+	return s, nil
+}
+
+// GetAllSnapshotsForURL gets all snapshots for a URL with context
+func (d *DbServiceImpl) GetAllSnapshotsForURL(ctx context.Context, tx *sqlx.Tx, url string) ([]*snapshot.Snapshot, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting all snapshots for URL %s", url)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	snapshots := []*snapshot.Snapshot{}
+	err := tx.SelectContext(ctx, &snapshots, SQL_GET_ALL_SNAPSHOTS_FOR_URL, url)
+	if err != nil {
+		return nil, xerrors.NewError(fmt.Errorf("cannot get all snapshots for URL %s: %w", url, err), 0, "", false)
+	}
+	return snapshots, nil
+}
+
+// GetSnapshotsByDateRange gets snapshots by date range with context
+func (d *DbServiceImpl) GetSnapshotsByDateRange(ctx context.Context, tx *sqlx.Tx, url string, startTime, endTime time.Time) ([]*snapshot.Snapshot, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Getting snapshots for URL %s in date range %v to %v", url, startTime, endTime)
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Context-aware implementation
+	snapshots := []*snapshot.Snapshot{}
+	err := tx.SelectContext(ctx, &snapshots, SQL_GET_SNAPSHOTS_BY_DATE_RANGE, url, startTime, endTime)
+	if err != nil {
+		return nil, xerrors.NewError(fmt.Errorf("cannot get snapshots for URL %s in date range %v to %v: %w",
+			url, startTime, endTime, err), 0, "", false)
+	}
+	return snapshots, nil
+}
+
+// IsContentIdentical checks if content is identical with context
+func (d *DbServiceImpl) IsContentIdentical(ctx context.Context, tx *sqlx.Tx, s *snapshot.Snapshot) (bool, error) {
+	dbCtx := contextutil.ContextWithComponent(ctx, "database")
+	contextlog.LogDebugWithContext(dbCtx, logging.GetSlogger(), "Checking if content is identical for URL %s", s.URL.String())
+
+	// Check if the context is cancelled before proceeding
+	if err := ctx.Err(); err != nil {
+		return false, err
+	}
+
+	// Try to get the latest snapshot for this URL
+	latestSnapshot := &snapshot.Snapshot{}
+	err := tx.GetContext(ctx, latestSnapshot, SQL_GET_LATEST_SNAPSHOT, s.URL.String())
+	if err != nil {
+		// If there's no snapshot yet, it can't be identical
+		if errors.Is(err, sql.ErrNoRows) {
+			return false, nil
+		}
+		return false, xerrors.NewError(err, 0, "", true)
+	}
+
+	// Check context cancellation before potentially expensive comparison
+	if err := ctx.Err(); err != nil {
+		return false, err
+	}
+
+	// Check if the content is identical
+	if s.GemText.Valid && latestSnapshot.GemText.Valid {
+		return s.GemText.String == latestSnapshot.GemText.String, nil
+	} else if s.Data.Valid && latestSnapshot.Data.Valid {
+		return bytes.Equal(s.Data.V, latestSnapshot.Data.V), nil
+	}
+
+	return false, nil
+}
+
+// SafeRollback attempts to roll back a transaction,
+// handling the case if the tx was already finalized.
+func SafeRollback(ctx context.Context, tx *sqlx.Tx) error {
+	rollbackErr := tx.Rollback()
+	if rollbackErr != nil {
+		// Check if it's the standard "transaction already finalized" error
+		if errors.Is(rollbackErr, sql.ErrTxDone) {
+			contextlog.LogWarnWithContext(ctx, logging.GetSlogger(), "Rollback failed because transaction is already finalized")
+			return nil
+		}
+		// Only return error for other types of rollback failures
+		contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Failed to rollback transaction: %v", rollbackErr)
+		return xerrors.NewError(fmt.Errorf("failed to rollback transaction: %w", rollbackErr), 0, "", true)
 	}
 	return nil
 }

db/db_queries.go

@@ -18,50 +18,153 @@ LIMIT $1
 	SQL_SELECT_RANDOM_URLS = `
 SELECT url
 FROM urls u
+WHERE u.being_processed IS NOT TRUE
 ORDER BY RANDOM()
 FOR UPDATE SKIP LOCKED
 LIMIT $1
 `
-	SQL_INSERT_SNAPSHOT_IF_NEW = `
-        INSERT INTO snapshots (url, host, timestamp, mimetype, data, gemtext, links, lang, response_code, error)
-        VALUES (:url, :host, :timestamp, :mimetype, :data, :gemtext, :links, :lang, :response_code, :error)
-        ON CONFLICT (url) DO NOTHING
-    `
-	SQL_UPSERT_SNAPSHOT = `INSERT INTO snapshots (url, host, timestamp, mimetype, data, gemtext, links, lang, response_code, error)
-        VALUES (:url, :host, :timestamp, :mimetype, :data, :gemtext, :links, :lang, :response_code, :error)
-        ON CONFLICT (url) DO UPDATE SET
-            url = EXCLUDED.url,
-            host = EXCLUDED.host,
-            timestamp = EXCLUDED.timestamp,
-            mimetype = EXCLUDED.mimetype,
-            data = EXCLUDED.data,
-            gemtext = EXCLUDED.gemtext,
-            links = EXCLUDED.links,
-            lang = EXCLUDED.lang,
-            response_code = EXCLUDED.response_code,
-            error = EXCLUDED.error
+	SQL_MARK_URLS_BEING_PROCESSED      = `UPDATE urls SET being_processed = true WHERE url IN (%s)`
+	SQL_SELECT_RANDOM_URLS_GEMINI_ONLY = `
+SELECT url
+FROM urls u
+WHERE u.url like 'gemini://%'
+  AND u.being_processed IS NOT TRUE
+ORDER BY RANDOM()
+FOR UPDATE SKIP LOCKED
+LIMIT $1
+`
+	SQL_SELECT_RANDOM_URLS_GEMINI_ONLY_2 = `
+WITH RankedUrls AS (
+    -- Step 1: Assign a random rank to each URL within its host group
+    SELECT
+        url,
+        host,
+        ROW_NUMBER() OVER (PARTITION BY host ORDER BY RANDOM()) as rn
+    FROM
+        urls
+    WHERE url like 'gemini://%'
+      AND being_processed IS NOT TRUE
+),
+OneUrlPerHost AS (
+    -- Step 2: Filter to keep only the first-ranked (random) URL per host
+    SELECT
+        url,
+        host
+    FROM
+        RankedUrls
+    WHERE
+        rn = 1
+)
+-- Step 3: From the set of one URL per host, randomly select X
+SELECT
+    url
+FROM
+    OneUrlPerHost
+ORDER BY
+    RANDOM()
+FOR UPDATE SKIP LOCKED
+LIMIT $1
+`
+	// New query - always insert a new snapshot without conflict handling
+	SQL_INSERT_SNAPSHOT = `
+        INSERT INTO snapshots (url, host, timestamp, mimetype, data, gemtext, links, lang, response_code, error, header, last_crawled)
+        VALUES (:url, :host, :timestamp, :mimetype, :data, :gemtext, :links, :lang, :response_code, :error, :header, :last_crawled)
         RETURNING id
-`
-	SQL_UPDATE_SNAPSHOT = `UPDATE snapshots
-SET url = :url,
-host = :host,
-timestamp = :timestamp,
-mimetype = :mimetype,
-data = :data,
-gemtext = :gemtext,
-links = :links,
-lang = :lang,
-response_code = :response_code,
-error = :error
-WHERE id = :id
-RETURNING id
-`
+    `
 	SQL_INSERT_URL = `
         INSERT INTO urls (url, host, timestamp)
         VALUES (:url, :host, :timestamp)
         ON CONFLICT (url) DO NOTHING
+    `
+	SQL_UPDATE_URL = `
+        UPDATE urls
+        SET url = :NormalizedURL
+        WHERE url = :Url
+        AND NOT EXISTS (
+            SELECT 1 FROM urls WHERE url = :NormalizedURL
+        )
     `
 	SQL_DELETE_URL = `
         DELETE FROM urls WHERE url=$1
     `
+	SQL_GET_LATEST_SNAPSHOT = `
+        SELECT * FROM snapshots
+        WHERE url = $1
+        ORDER BY timestamp DESC
+        LIMIT 1
+    `
+	SQL_GET_SNAPSHOT_AT_TIMESTAMP = `
+        SELECT * FROM snapshots
+        WHERE url = $1
+        AND timestamp <= $2
+        ORDER BY timestamp DESC
+        LIMIT 1
+    `
+	SQL_GET_ALL_SNAPSHOTS_FOR_URL = `
+        SELECT * FROM snapshots
+        WHERE url = $1
+        ORDER BY timestamp DESC
+    `
+	SQL_GET_SNAPSHOTS_BY_DATE_RANGE = `
+        SELECT * FROM snapshots
+        WHERE url = $1
+        AND timestamp BETWEEN $2 AND $3
+        ORDER BY timestamp DESC
+    `
+	// Update last_crawled timestamp for the most recent snapshot of a URL
+	SQL_UPDATE_LAST_CRAWLED = `
+        UPDATE snapshots 
+        SET last_crawled = CURRENT_TIMESTAMP 
+        WHERE url = $1
+    `
+	// SQL_FETCH_SNAPSHOTS_FROM_HISTORY Fetches URLs from snapshots for re-crawling based on last_crawled timestamp
+	// This query finds root domain URLs that haven't been crawled recently and selects
+	// one URL per host for diversity. Uses CTEs to:
+	// 1. Find latest crawl attempt per URL (via MAX(last_crawled))
+	// 2. Filter to URLs with actual content and successful responses (20-29)
+	// 3. Select URLs where latest crawl is older than cutoff date
+	// 4. Rank randomly within each host and pick one URL per host
+	// Parameters: $1 = cutoff_date, $2 = limit
+	SQL_FETCH_SNAPSHOTS_FROM_HISTORY = `
+		WITH latest_attempts AS (
+			SELECT 
+				url,
+				host,
+				COALESCE(MAX(last_crawled), '1970-01-01'::timestamp) as latest_attempt
+			FROM snapshots
+			WHERE url ~ '^gemini://[^/]+/?$' AND mimetype = 'text/gemini' AND error IS NULL
+			GROUP BY url, host
+		),
+		root_urls_with_content AS (
+			SELECT DISTINCT
+				la.url,
+				la.host,
+				la.latest_attempt
+			FROM latest_attempts la
+			JOIN snapshots s ON s.url = la.url 
+			WHERE (s.gemtext IS NOT NULL OR s.data IS NOT NULL)
+				AND s.response_code BETWEEN 20 AND 29
+		),
+		eligible_urls AS (
+			SELECT 
+				url,
+				host,
+				latest_attempt
+			FROM root_urls_with_content
+			WHERE latest_attempt < $1
+		),
+		ranked_urls AS (
+			SELECT
+				url,
+				host,
+				latest_attempt,
+				ROW_NUMBER() OVER (PARTITION BY host ORDER BY RANDOM()) as rank
+			FROM eligible_urls
+		)
+		SELECT url, host
+		FROM ranked_urls
+		WHERE rank = 1
+		ORDER BY RANDOM()
+		LIMIT $2
+    `
 )

db/sql/initdb.sql

@@ -1,35 +0,0 @@
-DROP TABLE IF EXISTS snapshots;
-
-CREATE TABLE snapshots (
-    id SERIAL PRIMARY KEY,
-    url TEXT NOT NULL UNIQUE,
-    host TEXT NOT NULL,
-    timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    mimetype TEXT,
-    data BYTEA,
-    gemtext TEXT,
-    links JSONB,
-    lang TEXT,
-    response_code INTEGER,
-    error TEXT
-);
-
-CREATE INDEX idx_url ON snapshots (url);
-CREATE INDEX idx_timestamp ON snapshots (timestamp);
-CREATE INDEX idx_mimetype ON snapshots (mimetype);
-CREATE INDEX idx_lang ON snapshots (lang);
-CREATE INDEX idx_response_code ON snapshots (response_code);
-CREATE INDEX idx_error ON snapshots (error);
-CREATE INDEX idx_host ON snapshots (host);
-CREATE INDEX unique_uid_url ON snapshots (uid, url);
-CREATE INDEX idx_response_code_error_nulls ON snapshots (response_code, error) WHERE response_code IS NULL AND error IS NULL;
-
-CREATE TABLE urls (
-                      id SERIAL PRIMARY KEY,
-                      url TEXT NOT NULL UNIQUE,
-                      host TEXT NOT NULL,
-                      timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
-);
-CREATE INDEX idx_urls_url ON urls (url);
-CREATE INDEX idx_urls_timestamp ON urls (timestamp);
-

gemget.sh

@@ -1,16 +0,0 @@
-#!/bin/env bash
-set -eu
-set -o pipefail
-
-# Max response size 10MiB
-LOG_LEVEL=debug \
-PRINT_WORKER_STATUS=false \
-DRY_RUN=false \
-NUM_OF_WORKERS=1 \
-WORKER_BATCH_SIZE=1 \
-BLACKLIST_PATH="$(pwd)/blacklist.txt" \
-MAX_RESPONSE_SIZE=10485760 \
-RESPONSE_TIMEOUT=10 \
-PANIC_ON_UNEXPECTED_ERROR=true \
-go run ./bin/gemget/main.go "$@"
-

gemini/errors.go

@@ -1,9 +1,8 @@
 package gemini
 
 import (
+	"errors"
 	"fmt"
-
-	"github.com/antanst/go_errors"
 )
 
 // GeminiError is used to represent
@@ -20,6 +19,10 @@ func (e *GeminiError) Error() string {
 	return fmt.Sprintf("gemini error: code %d %s", e.Code, e.Msg)
 }
 
+func (e *GeminiError) String() string {
+	return e.Error()
+}
+
 // NewGeminiError creates a new GeminiError based on the status code and header.
 // Status codes are based on the Gemini protocol specification:
 // - 1x: Input required
@@ -57,5 +60,5 @@ func IsGeminiError(err error) bool {
 		return false
 	}
 	var asError *GeminiError
-	return go_errors.As(err, &asError)
+	return errors.As(err, &asError)
 }

gemini/errors_test.go

@@ -1,38 +1,36 @@
-package errors_test
+package gemini
 
 import (
 	"errors"
 	"fmt"
 	"testing"
-
-	"gemini-grc/gemini"
 )
 
 func TestErrGemini(t *testing.T) {
 	t.Parallel()
-	err := gemini.NewGeminiError(50, "50 server error")
-	if !errors.As(err, new(*gemini.GeminiError)) {
+	err := NewGeminiError(50, "50 server error")
+	if !errors.As(err, new(*GeminiError)) {
 		t.Errorf("TestErrGemini fail")
 	}
 }
 
 func TestErrGeminiWrapped(t *testing.T) {
 	t.Parallel()
-	err := gemini.NewGeminiError(50, "50 server error")
+	err := NewGeminiError(50, "50 server error")
 	errWrapped := fmt.Errorf("%w wrapped", err)
-	if !errors.As(errWrapped, new(*gemini.GeminiError)) {
+	if !errors.As(errWrapped, new(*GeminiError)) {
 		t.Errorf("TestErrGeminiWrapped fail")
 	}
 }
 
 func TestIsGeminiError(t *testing.T) {
 	t.Parallel()
-	err1 := gemini.NewGeminiError(50, "50 server error")
-	if !gemini.IsGeminiError(err1) {
+	err1 := NewGeminiError(50, "50 server error")
+	if !IsGeminiError(err1) {
 		t.Errorf("TestGeminiError fail #1")
 	}
 	wrappedErr1 := fmt.Errorf("wrapped %w", err1)
-	if !gemini.IsGeminiError(wrappedErr1) {
+	if !IsGeminiError(wrappedErr1) {
 		t.Errorf("TestGeminiError fail #2")
 	}
 }

gemini/files.go

@@ -1,114 +0,0 @@
-package gemini
-
-import (
-	"fmt"
-	"net/url"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-
-	"gemini-grc/common/snapshot"
-	"gemini-grc/logging"
-)
-
-// sanitizePath encodes invalid filesystem characters using URL encoding.
-// Example:
-// /example/path/to/page?query=param&another=value
-// would become
-// example/path/to/page%3Fquery%3Dparam%26another%3Dvalue
-func sanitizePath(p string) string {
-	// Split the path into its components
-	components := strings.Split(p, "/")
-
-	// Encode each component separately
-	for i, component := range components {
-		// Decode any existing percent-encoded characters
-		decodedComponent, err := url.PathUnescape(component)
-		if err != nil {
-			decodedComponent = component // Fallback to original if unescape fails
-		}
-
-		// Encode the component to escape invalid filesystem characters
-		encodedComponent := url.QueryEscape(decodedComponent)
-
-		// Replace '+' (from QueryEscape) with '%20' to handle spaces correctly
-		encodedComponent = strings.ReplaceAll(encodedComponent, "+", "%20")
-
-		components[i] = encodedComponent
-	}
-
-	// Rejoin the components into a sanitized path
-	safe := filepath.Join(components...)
-
-	return safe
-}
-
-// getFilePath constructs a safe file path from the root path and URL path.
-// It URL-encodes invalid filesystem characters to ensure the path is valid.
-func calcFilePath(rootPath, urlPath string) (string, error) {
-	// Normalize the URL path
-	cleanPath := filepath.Clean(urlPath)
-
-	// Safe check to prevent directory traversal
-	if strings.Contains(cleanPath, "..") {
-		return "", fmt.Errorf("Invalid URL path: contains directory traversal")
-	}
-
-	// Sanitize the path by encoding invalid characters
-	safePath := sanitizePath(cleanPath)
-
-	// Join the root path and the sanitized URL path
-	finalPath := filepath.Join(rootPath, safePath)
-
-	return finalPath, nil
-}
-
-func SaveToFile(rootPath string, s *snapshot.Snapshot, done chan struct{}) {
-	parentPath := path.Join(rootPath, s.URL.Hostname)
-	urlPath := s.URL.Path
-	// If path is empty, add `index.gmi` as the file to save
-	if urlPath == "" || urlPath == "." {
-		urlPath = "index.gmi"
-	}
-	// If path ends with '/' then add index.gmi for the
-	// directory to be created.
-	if strings.HasSuffix(urlPath, "/") {
-		urlPath = strings.Join([]string{urlPath, "index.gmi"}, "")
-	}
-
-	finalPath, err := calcFilePath(parentPath, urlPath)
-	if err != nil {
-		logging.LogError("GeminiError saving %s: %w", s.URL, err)
-		return
-	}
-	// Ensure the directory exists
-	dir := filepath.Dir(finalPath)
-	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
-		logging.LogError("Failed to create directory: %w", err)
-		return
-	}
-	if s.MimeType.Valid && s.MimeType.String == "text/gemini" {
-		err = os.WriteFile(finalPath, (*s).Data.V, 0o666)
-	} else {
-		err = os.WriteFile(finalPath, []byte((*s).GemText.String), 0o666)
-	}
-	if err != nil {
-		logging.LogError("GeminiError saving %s: %w", s.URL.Full, err)
-	}
-	close(done)
-}
-
-func ReadLines(path string) []string {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		panic(fmt.Sprintf("Failed to read file: %s", err))
-	}
-	lines := strings.Split(string(data), "\n")
-	// remove last line if empty
-	// (happens when file ends with '\n')
-	if lines[len(lines)-1] == "" {
-		lines = lines[:len(lines)-1]
-	}
-	return lines
-}

gemini/geminiLinks.go

@@ -7,9 +7,9 @@ import (
 
 	"gemini-grc/common/linkList"
 	url2 "gemini-grc/common/url"
-	"gemini-grc/logging"
 	"gemini-grc/util"
-	"github.com/antanst/go_errors"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 )
 
 func GetPageLinks(currentURL url2.URL, gemtext string) linkList.LinkList {
@@ -37,14 +37,14 @@ func ParseGeminiLinkLine(linkLine string, currentURL string) (*url2.URL, error)
 	// Check: currentURL is parseable
 	baseURL, err := url.Parse(currentURL)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
 	}
 
 	// Extract the actual URL and the description
 	re := regexp.MustCompile(`^=>[ \t]+(\S+)([ \t]+.*)?`)
 	matches := re.FindStringSubmatch(linkLine)
 	if len(matches) == 0 {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing link line: no regexp match for line %s", linkLine))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing link line: no regexp match for line %s", linkLine), 0, "", false)
 	}
 
 	originalURLStr := matches[1]
@@ -52,7 +52,7 @@ func ParseGeminiLinkLine(linkLine string, currentURL string) (*url2.URL, error)
 	// Check: Unescape the URL if escaped
 	_, err = url.QueryUnescape(originalURLStr)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
 	}
 
 	description := ""
@@ -63,7 +63,7 @@ func ParseGeminiLinkLine(linkLine string, currentURL string) (*url2.URL, error)
 	// Parse the URL from the link line
 	parsedURL, err := url.Parse(originalURLStr)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
 	}
 
 	// If link URL is relative, resolve full URL
@@ -80,7 +80,7 @@ func ParseGeminiLinkLine(linkLine string, currentURL string) (*url2.URL, error)
 
 	finalURL, err := url2.ParseURL(parsedURL.String(), description, true)
 	if err != nil {
-		return nil, go_errors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine))
+		return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
 	}
 
 	return finalURL, nil

gemini/network.go

@@ -1,7 +1,9 @@
 package gemini
 
 import (
+	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -12,156 +14,201 @@ import (
 	"strings"
 	"time"
 
-	errors2 "gemini-grc/common/errors"
+	"gemini-grc/common/contextlog"
 	"gemini-grc/common/snapshot"
 	_url "gemini-grc/common/url"
 	"gemini-grc/config"
-	"gemini-grc/logging"
-
-	"github.com/antanst/go_errors"
+	"gemini-grc/contextutil"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 	"github.com/guregu/null/v5"
 )
 
-// Visit given URL, using the Gemini protocol.
-// Mutates given Snapshot with the data.
-// In case of error, we store the error string
-// inside snapshot and return the error.
-func Visit(url string) (s *snapshot.Snapshot, err error) {
+// Visit visits a given URL using the Gemini protocol,
+// and returns a populated snapshot. Any relevant errors
+// when visiting the URL are stored in the snapshot;
+// an error is returned only when construction of a
+// snapshot was not possible (context cancellation errors,
+// not a valid URL etc.)
+func Visit(ctx context.Context, url string) (s *snapshot.Snapshot, err error) {
+	geminiCtx := contextutil.ContextWithComponent(ctx, "network")
+
 	s, err = snapshot.SnapshotFromURL(url, true)
 	if err != nil {
 		return nil, err
 	}
 
-	defer func() {
+	// Check if the context has been canceled
+	if err := ctx.Err(); err != nil {
+		return nil, xerrors.NewSimpleError(err)
+	}
+
+	data, err := ConnectAndGetData(geminiCtx, s.URL.String())
 	if err != nil {
-			// GeminiError and HostError should
-			// be stored in the snapshot. Other
-			// errors are returned.
-			if errors2.IsHostError(err) {
 		s.Error = null.StringFrom(err.Error())
-				err = nil
-			} else if IsGeminiError(err) {
-				s.Error = null.StringFrom(err.Error())
-				s.Header = null.StringFrom(go_errors.Unwrap(err).(*GeminiError).Header)
-				s.ResponseCode = null.IntFrom(int64(go_errors.Unwrap(err).(*GeminiError).Code))
-				err = nil
-			} else {
-				s = nil
-			}
-		}
-	}()
-
-	data, err := ConnectAndGetData(s.URL.String())
-	if err != nil {
-		return s, err
+		return s, nil
 	}
 
-	s, err = processData(*s, data)
-	if err != nil {
-		return s, err
+	// Check if the context has been canceled
+	if err := ctx.Err(); err != nil {
+		return nil, xerrors.NewSimpleError(err)
 	}
 
-	if isGeminiCapsule(s) {
+	s = UpdateSnapshotWithData(*s, data)
+
+	if !s.Error.Valid &&
+		s.MimeType.Valid &&
+		s.MimeType.String == "text/gemini" &&
+		len(s.GemText.ValueOrZero()) > 0 {
 		links := GetPageLinks(s.URL, s.GemText.String)
 		if len(links) > 0 {
-			logging.LogDebug("Found %d links", len(links))
 			s.Links = null.ValueFrom(links)
 		}
 	}
+
 	return s, nil
 }
 
-func ConnectAndGetData(url string) ([]byte, error) {
+// ConnectAndGetData is a context-aware version of ConnectAndGetData
+// that returns the data from a GET request to a Gemini URL. It uses the context
+// for cancellation, timeout, and logging.
+func ConnectAndGetData(ctx context.Context, url string) ([]byte, error) {
 	parsedURL, err := stdurl.Parse(url)
 	if err != nil {
-		return nil, go_errors.NewError(err)
+		return nil, xerrors.NewSimpleError(fmt.Errorf("error parsing URL: %w", err))
 	}
+
 	hostname := parsedURL.Hostname()
 	port := parsedURL.Port()
 	if port == "" {
 		port = "1965"
 	}
 	host := fmt.Sprintf("%s:%s", hostname, port)
+
+	// Check if the context has been canceled before proceeding
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
 	timeoutDuration := time.Duration(config.CONFIG.ResponseTimeout) * time.Second
-	// Establish the underlying TCP connection.
+
+	// Establish the underlying TCP connection with context-based cancellation
 	dialer := &net.Dialer{
 		Timeout: timeoutDuration,
 	}
-	conn, err := dialer.Dial("tcp", host)
+
+	conn, err := dialer.DialContext(ctx, "tcp", host)
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Failed to establish TCP connection: %v", err)
+		return nil, xerrors.NewSimpleError(err)
 	}
-	// Make sure we always close the connection.
+
+	// Make sure we always close the connection
 	defer func() {
 		_ = conn.Close()
 	}()
 
-	// Set read and write timeouts on the TCP connection.
 	err = conn.SetReadDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, xerrors.NewSimpleError(err)
 	}
 	err = conn.SetWriteDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, xerrors.NewSimpleError(err)
+	}
+
+	// Check if the context has been canceled before proceeding with TLS handshake
+	if err := ctx.Err(); err != nil {
+		return nil, err
 	}
 
 	// Perform the TLS handshake
 	tlsConfig := &tls.Config{
 		InsecureSkipVerify: true,                 //nolint:gosec    // Accept all TLS certs, even if insecure.
 		ServerName:         parsedURL.Hostname(), // SNI says we should not include port in hostname
-		// MinVersion:         tls.VersionTLS12, // Use a minimum TLS version. Warning breaks a lot of sites.
 	}
+
 	tlsConn := tls.Client(conn, tlsConfig)
 	err = tlsConn.SetReadDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, xerrors.NewSimpleError(err)
 	}
 	err = tlsConn.SetWriteDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
-	}
-	err = tlsConn.Handshake()
-	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, xerrors.NewSimpleError(err)
 	}
 
-	// We read `buf`-sized chunks and add data to `data`.
+	// Check if the context is done before attempting handshake
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Perform TLS handshake with regular method
+	// (HandshakeContext is only available in Go 1.17+)
+	err = tlsConn.Handshake()
+	if err != nil {
+		return nil, xerrors.NewSimpleError(err)
+	}
+
+	// Check again if the context is done after handshake
+	if err := ctx.Err(); err != nil {
+		return nil, xerrors.NewSimpleError(err)
+	}
+
+	// We read `buf`-sized chunks and add data to `data`
 	buf := make([]byte, 4096)
 	var data []byte
 
-	// Send Gemini request to trigger server response.
+	// Check if the context has been canceled before sending request
+	if err := ctx.Err(); err != nil {
+		return nil, xerrors.NewSimpleError(err)
+	}
+
+	// Send Gemini request to trigger server response
 	// Fix for stupid server bug:
 	// Some servers return 'Header: 53 No proxying to other hosts or ports!'
 	// when the port is 1965 and is still specified explicitly in the URL.
 	url2, _ := _url.ParseURL(url, "", true)
 	_, err = tlsConn.Write([]byte(fmt.Sprintf("%s\r\n", url2.StringNoDefaultPort())))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, xerrors.NewSimpleError(err)
 	}
+
 	// Read response bytes in len(buf) byte chunks
 	for {
+		// Check if the context has been canceled before each read
+		if err := ctx.Err(); err != nil {
+			return nil, xerrors.NewSimpleError(err)
+		}
+
 		n, err := tlsConn.Read(buf)
 		if n > 0 {
 			data = append(data, buf[:n]...)
 		}
 		if len(data) > config.CONFIG.MaxResponseSize {
-			return nil, errors2.NewHostError(err)
+			contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Response too large (max: %d bytes)", config.CONFIG.MaxResponseSize)
+			return nil, xerrors.NewSimpleError(fmt.Errorf("response too large"))
 		}
 		if err != nil {
-			if go_errors.Is(err, io.EOF) {
+			if errors.Is(err, io.EOF) {
 				break
 			}
-			return nil, errors2.NewHostError(err)
+			contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Error reading data: %v", err)
+			return nil, xerrors.NewSimpleError(err)
 		}
 	}
+
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Received %d bytes of data", len(data))
 	return data, nil
 }
 
-func processData(s snapshot.Snapshot, data []byte) (*snapshot.Snapshot, error) {
+// UpdateSnapshotWithData processes the raw data from a Gemini response and populates the Snapshot.
+// This function is exported for use by the robotsMatch package.
+func UpdateSnapshotWithData(s snapshot.Snapshot, data []byte) *snapshot.Snapshot {
 	header, body, err := getHeadersAndData(data)
 	if err != nil {
-		return nil, err
+		s.Error = null.StringFrom(err.Error())
+		return &s
 	}
 	code, mimeType, lang := getMimeTypeAndLang(header)
 
@@ -183,13 +230,14 @@ func processData(s snapshot.Snapshot, data []byte) (*snapshot.Snapshot, error) {
 	if mimeType == "text/gemini" {
 		validBody, err := BytesToValidUTF8(body)
 		if err != nil {
-			return nil, err
+			s.Error = null.StringFrom(err.Error())
+			return &s
 		}
 		s.GemText = null.StringFrom(validBody)
 	} else {
 		s.Data = null.ValueFrom(body)
 	}
-	return &s, nil
+	return &s
 }
 
 // Checks for a Gemini header, which is
@@ -199,7 +247,7 @@ func processData(s snapshot.Snapshot, data []byte) (*snapshot.Snapshot, error) {
 func getHeadersAndData(data []byte) (string, []byte, error) {
 	firstLineEnds := slices.Index(data, '\n')
 	if firstLineEnds == -1 {
-		return "", nil, errors2.NewHostError(fmt.Errorf("error parsing header"))
+		return "", nil, xerrors.NewSimpleError(fmt.Errorf("error parsing header"))
 	}
 	firstLine := string(data[:firstLineEnds])
 	rest := data[firstLineEnds+1:]
@@ -217,17 +265,17 @@ func getMimeTypeAndLang(headers string) (int, string, string) {
 	// - Only capturing the lang value, ignoring charset
 	re := regexp.MustCompile(`^(\d+)\s+([a-zA-Z0-9/\-+]+)(?:(?:[\s;]+(?:charset=[^;\s]+|lang=([a-zA-Z0-9-]+)))*)\s*$`)
 	matches := re.FindStringSubmatch(headers)
-	if matches == nil || len(matches) <= 1 {
+	if len(matches) <= 1 {
 		// If full format doesn't match, try to match redirect format: "<code> <URL>"
 		// This handles cases like "31 gemini://example.com"
 		re := regexp.MustCompile(`^(\d+)\s+(.+)$`)
 		matches := re.FindStringSubmatch(headers)
-		if matches == nil || len(matches) <= 1 {
+		if len(matches) <= 1 {
 			// If redirect format doesn't match, try to match just a status code
 			// This handles cases like "99"
 			re := regexp.MustCompile(`^(\d+)\s*$`)
 			matches := re.FindStringSubmatch(headers)
-			if matches == nil || len(matches) <= 1 {
+			if len(matches) <= 1 {
 				return 0, "", ""
 			}
 			code, err := strconv.Atoi(matches[1])
@@ -250,7 +298,3 @@ func getMimeTypeAndLang(headers string) (int, string, string) {
 	lang := matches[3] // Will be empty string if no lang parameter was found
 	return code, mimeType, lang
 }
-
-func isGeminiCapsule(s *snapshot.Snapshot) bool {
-	return !s.Error.Valid && s.MimeType.Valid && s.MimeType.String == "text/gemini"
-}

gemini/network_test.go

@@ -135,17 +135,7 @@ func TestProcessData(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
 			s := snapshot.Snapshot{}
-			result, err := processData(s, test.inputData)
-
-			if test.expectedError && err == nil {
-				t.Errorf("Expected error, got nil")
-				return
-			}
-
-			if !test.expectedError && err != nil {
-				t.Errorf("Unexpected error: %v", err)
-				return
-			}
+			result := UpdateSnapshotWithData(s, test.inputData)
 
 			if test.expectedError {
 				return
@@ -175,192 +165,3 @@ func TestProcessData(t *testing.T) {
 		})
 	}
 }
-
-//// Mock Gemini server for testing ConnectAndGetData
-//func mockGeminiServer(response string, delay time.Duration, closeConnection bool) net.Listener {
-//	listener, err := net.Listen("tcp", "127.0.0.1:0") // Bind to a random available port
-//	if err != nil {
-//		panic(fmt.Sprintf("Failed to create mock server: %v", err))
-//	}
-//
-//	go func() {
-//		conn, err := listener.Accept()
-//		if err != nil {
-//			if !closeConnection { // Don't panic if we closed the connection on purpose
-//				panic(fmt.Sprintf("Failed to accept connection: %v", err))
-//			}
-//			return
-//		}
-//		defer conn.Close()
-//
-//		time.Sleep(delay) // Simulate network latency
-//
-//		_, err = conn.Write([]byte(response))
-//		if err != nil && !closeConnection {
-//			panic(fmt.Sprintf("Failed to write response: %v", err))
-//		}
-//	}()
-//
-//	return listener
-//}
-
-// func TestConnectAndGetData(t *testing.T) {
-// 	config.CONFIG = config.ConfigStruct{
-// 		ResponseTimeout: 5,
-// 		MaxResponseSize: 1024 * 1024,
-// 	}
-// 	tests := []struct {
-// 		name            string
-// 		serverResponse  string
-// 		serverDelay     time.Duration
-// 		expectedData    []byte
-// 		expectedError   bool
-// 		closeConnection bool
-// 	}{
-// 		{
-// 			name:           "Successful response",
-// 			serverResponse: "20 text/gemini\r\n# Hello",
-// 			expectedData:   []byte("20 text/gemini\r\n# Hello"),
-// 			expectedError:  false,
-// 		},
-// 		{
-// 			name:           "Server error",
-// 			serverResponse: "50 Server error\r\n",
-// 			expectedData:   []byte("50 Server error\r\n"),
-// 			expectedError:  false,
-// 		},
-// 		{
-// 			name:          "Timeout",
-// 			serverDelay:   6 * time.Second, // Longer than the timeout
-// 			expectedError: true,
-// 		},
-// 		{
-// 			name:            "Server closes connection",
-// 			closeConnection: true,
-// 			expectedError:   true,
-// 		},
-// 	}
-
-// 	for _, test := range tests {
-// 		t.Run(test.name, func(t *testing.T) {
-// 			listener := mockGeminiServer(test.serverResponse, test.serverDelay, test.closeConnection)
-// 			defer func() {
-// 				test.closeConnection = true // Prevent panic in mock server
-// 				listener.Close()
-// 			}()
-// 			addr := listener.Addr().String()
-// 			data, err := ConnectAndGetData(fmt.Sprintf("gemini://%s/", addr))
-
-// 			if test.expectedError && err == nil {
-// 				t.Errorf("Expected error, got nil")
-// 			}
-
-// 			if !test.expectedError && err != nil {
-// 				t.Errorf("Unexpected error: %v", err)
-// 			}
-
-// 			if !slices.Equal(data, test.expectedData) {
-// 				t.Errorf("Expected data '%s', got '%s'", test.expectedData, data)
-// 			}
-// 		})
-// 	}
-// }
-
-// func TestVisit(t *testing.T) {
-// 	config.CONFIG = config.ConfigStruct{
-// 		ResponseTimeout: 5,
-// 		MaxResponseSize: 1024 * 1024,
-// 	}
-// 	tests := []struct {
-// 		name           string
-// 		serverResponse string
-// 		expectedCode   int
-// 		expectedMime   string
-// 		expectedError  bool
-// 		expectedLinks  []string
-// 	}{
-// 		{
-// 			name:           "Successful response",
-// 			serverResponse: "20 text/gemini\r\n# Hello\n=> /link1 Link 1\n=> /link2 Link 2",
-// 			expectedCode:   20,
-// 			expectedMime:   "text/gemini",
-// 			expectedError:  false,
-// 			expectedLinks:  []string{"gemini://127.0.0.1:1965/link1", "gemini://127.0.0.1:1965/link2"},
-// 		},
-// 		{
-// 			name:           "Server error",
-// 			serverResponse: "50 Server error\r\n",
-// 			expectedCode:   50,
-// 			expectedMime:   "Server error",
-// 			expectedError:  false,
-// 			expectedLinks:  []string{},
-// 		},
-// 	}
-
-// 	for _, test := range tests {
-// 		t.Run(test.name, func(t *testing.T) {
-// 			listener := mockGeminiServer(test.serverResponse, 0, false)
-// 			defer listener.Close()
-// 			addr := listener.Addr().String()
-// 			snapshot, err := Visit(fmt.Sprintf("gemini://%s/", addr))
-
-// 			if test.expectedError && err == nil {
-// 				t.Errorf("Expected error, got nil")
-// 			}
-
-// 			if !test.expectedError && err != nil {
-// 				t.Errorf("Unexpected error: %v", err)
-// 			}
-
-// 			if snapshot.ResponseCode.ValueOrZero() != int64(test.expectedCode) {
-// 				t.Errorf("Expected code %d, got %d", test.expectedCode, snapshot.ResponseCode.ValueOrZero())
-// 			}
-
-// 			if snapshot.MimeType.ValueOrZero() != test.expectedMime {
-// 				t.Errorf("Expected mimeType '%s', got '%s'", test.expectedMime, snapshot.MimeType.ValueOrZero())
-// 			}
-
-// 			if test.expectedLinks != nil {
-// 				links, _ := snapshot.Links.Value()
-
-// 				if len(links) != len(test.expectedLinks) {
-// 					t.Errorf("Expected %d links, got %d", len(test.expectedLinks), len(links))
-// 				}
-// 				for i, link := range links {
-// 					if link != test.expectedLinks[i] {
-// 						t.Errorf("Expected link '%s', got '%s'", test.expectedLinks[i], link)
-// 					}
-// 				}
-// 			}
-// 		})
-// 	}
-// }
-
-func TestVisit_InvalidURL(t *testing.T) {
-	t.Parallel()
-	_, err := Visit("invalid-url")
-	if err == nil {
-		t.Errorf("Expected error for invalid URL, got nil")
-	}
-}
-
-//func TestVisit_GeminiError(t *testing.T) {
-//	listener := mockGeminiServer("51 Not Found\r\n", 0, false)
-//	defer listener.Close()
-//	addr := listener.Addr().String()
-//
-//	s, err := Visit(fmt.Sprintf("gemini://%s/", addr))
-//	if err != nil {
-//		t.Errorf("Unexpected error: %v", err)
-//	}
-//
-//	expectedError := "51 Not Found"
-//	if s.Error.ValueOrZero() != expectedError {
-//		t.Errorf("Expected error in snapshot: %v, got %v", expectedError, s.Error)
-//	}
-//
-//	expectedCode := 51
-//	if s.ResponseCode.ValueOrZero() != int64(expectedCode) {
-//		t.Errorf("Expected code %d, got %d", expectedCode, s.ResponseCode.ValueOrZero())
-//	}
-//}

gemini/processing.go

@@ -7,7 +7,8 @@ import (
 	"io"
 	"unicode/utf8"
 
-	"github.com/antanst/go_errors"
+	"gemini-grc/config"
+	"git.antanst.com/antanst/xerrors"
 	"golang.org/x/text/encoding/charmap"
 	"golang.org/x/text/encoding/japanese"
 	"golang.org/x/text/encoding/korean"
@@ -23,11 +24,16 @@ func BytesToValidUTF8(input []byte) (string, error) {
 	if len(input) == 0 {
 		return "", nil
 	}
-	const maxSize = 10 * 1024 * 1024 // 10MB
-	if len(input) > maxSize {
-		return "", go_errors.NewError(fmt.Errorf("%w: %d bytes (max %d)", ErrInputTooLarge, len(input), maxSize))
+
+	maxSize := config.CONFIG.MaxResponseSize
+	if maxSize == 0 {
+		maxSize = 1024 * 1024 // Default 1MB for tests
 	}
-	// remove NULL byte 0x00 (ReplaceAll accepts slices)
+	if len(input) > maxSize {
+		return "", xerrors.NewError(fmt.Errorf("BytesToValidUTF8: %w: %d bytes (max %d)", ErrInputTooLarge, len(input), maxSize), 0, "", false)
+	}
+
+	// Always remove NULL bytes first (before UTF-8 validity check)
 	inputNoNull := bytes.ReplaceAll(input, []byte{byte(0)}, []byte{})
 	if utf8.Valid(inputNoNull) {
 		return string(inputNoNull), nil
@@ -42,6 +48,8 @@ func BytesToValidUTF8(input []byte) (string, error) {
 		japanese.EUCJP.NewDecoder(),      // Japanese
 		korean.EUCKR.NewDecoder(),        // Korean
 	}
+
+	// Still invalid Unicode. Try some encodings to convert to.
 	// First successful conversion wins.
 	var lastErr error
 	for _, encoding := range encodings {
@@ -56,5 +64,5 @@ func BytesToValidUTF8(input []byte) (string, error) {
 		}
 	}
 
-	return "", go_errors.NewError(fmt.Errorf("%w (tried %d encodings): %w", ErrUTF8Conversion, len(encodings), lastErr))
+	return "", xerrors.NewError(fmt.Errorf("BytesToValidUTF8: %w (tried %d encodings): %w", ErrUTF8Conversion, len(encodings), lastErr), 0, "", false)
 }

gemini/robotmatch.go

@@ -1,95 +0,0 @@
-package gemini
-
-import (
-	"fmt"
-	"strings"
-	"sync"
-
-	"gemini-grc/common/snapshot"
-	geminiUrl "gemini-grc/common/url"
-	"gemini-grc/logging"
-)
-
-// RobotsCache is a map of blocked URLs
-// key: URL
-// value: []string list of disallowed URLs
-// If a key has no blocked URLs, an empty
-// list is stored for caching.
-var RobotsCache sync.Map //nolint:gochecknoglobals
-
-func populateRobotsCache(key string) (entries []string, _err error) {
-	// We either store an empty list when
-	// no rules, or a list of disallowed URLs.
-	// This applies even if we have an error
-	// finding/downloading robots.txt
-	defer func() {
-		RobotsCache.Store(key, entries)
-	}()
-	url := fmt.Sprintf("gemini://%s/robots.txt", key)
-	robotsContent, err := ConnectAndGetData(url)
-	if err != nil {
-		return []string{}, err
-	}
-	s, err := snapshot.SnapshotFromURL(url, true)
-	if err != nil {
-		return []string{}, nil
-	}
-	s, err = processData(*s, robotsContent)
-	if err != nil {
-		logging.LogDebug("robots.txt error %s", err)
-		return []string{}, nil
-	}
-	if s.ResponseCode.ValueOrZero() != 20 {
-		logging.LogDebug("robots.txt error code %d, ignoring", s.ResponseCode.ValueOrZero())
-		return []string{}, nil
-	}
-	// Some return text/plain, others text/gemini.
-	// According to spec, the first is correct,
-	// however let's be lenient
-	var data string
-	switch {
-	case s.MimeType.ValueOrZero() == "text/plain":
-		data = string(s.Data.ValueOrZero())
-	case s.MimeType.ValueOrZero() == "text/gemini":
-		data = s.GemText.ValueOrZero()
-	default:
-		return []string{}, nil
-	}
-	entries = ParseRobotsTxt(data, key)
-	return entries, nil
-}
-
-// RobotMatch checks if the snapshot URL matches
-// a robots.txt allow rule.
-func RobotMatch(u string) (bool, error) {
-	url, err := geminiUrl.ParseURL(u, "", true)
-	if err != nil {
-		return false, err
-	}
-	key := strings.ToLower(fmt.Sprintf("%s:%d", url.Hostname, url.Port))
-	var disallowedURLs []string
-	cacheEntries, ok := RobotsCache.Load(key)
-	if !ok {
-		// First time check, populate robot cache
-		disallowedURLs, err := populateRobotsCache(key)
-		if err != nil {
-			return false, err
-		}
-		if len(disallowedURLs) > 0 {
-			logging.LogDebug("Added to robots.txt cache: %v => %v", key, disallowedURLs)
-		}
-	} else {
-		disallowedURLs, _ = cacheEntries.([]string)
-	}
-	return isURLblocked(disallowedURLs, url.Full), nil
-}
-
-func isURLblocked(disallowedURLs []string, input string) bool {
-	for _, url := range disallowedURLs {
-		if strings.HasPrefix(strings.ToLower(input), url) {
-			logging.LogDebug("robots.txt match: %s matches %s", input, url)
-			return true
-		}
-	}
-	return false
-}

gemini/robots.go

@@ -1,31 +0,0 @@
-package gemini
-
-import (
-	"fmt"
-	"strings"
-)
-
-// ParseRobotsTxt takes robots.txt content and a host, and
-// returns a list of full URLs that shouldn't
-// be visited.
-// TODO Also take into account the user agent?
-// Check gemini://geminiprotocol.net/docs/companion/robots.gmi
-func ParseRobotsTxt(content string, host string) []string {
-	var disallowedPaths []string
-	for _, line := range strings.Split(content, "\n") {
-		line = strings.TrimSpace(line)
-		line = strings.ToLower(line)
-		if strings.HasPrefix(line, "disallow:") {
-			parts := strings.SplitN(line, ":", 2)
-			if len(parts) == 2 {
-				path := strings.TrimSpace(parts[1])
-				if path != "" {
-					// Construct full Gemini URL
-					disallowedPaths = append(disallowedPaths,
-						fmt.Sprintf("gemini://%s%s", host, path))
-				}
-			}
-		}
-	}
-	return disallowedPaths
-}

go.mod

@@ -1,15 +1,15 @@
 module gemini-grc
 
-go 1.23.1
+go 1.24.3
 
 require (
-	github.com/antanst/go_errors v0.0.1
+	git.antanst.com/antanst/logging v0.0.1
+	git.antanst.com/antanst/uid v0.0.1
+	git.antanst.com/antanst/xerrors v0.0.2
 	github.com/guregu/null/v5 v5.0.0
 	github.com/jackc/pgx/v5 v5.7.2
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/lib/pq v1.10.9
-	github.com/matoous/go-nanoid/v2 v2.1.0
-	github.com/rs/zerolog v1.33.0
 	github.com/stretchr/testify v1.9.0
 	golang.org/x/text v0.21.0
 )
@@ -20,12 +20,15 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/kr/text v0.2.0 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.13.1 // indirect
 	golang.org/x/crypto v0.32.0 // indirect
 	golang.org/x/sync v0.10.0 // indirect
-	golang.org/x/sys v0.29.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace git.antanst.com/antanst/xerrors => ../xerrors
+
+replace git.antanst.com/antanst/uid => ../uid
+
+replace git.antanst.com/antanst/logging => ../logging

go.sum

@@ -1,15 +1,11 @@
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
-github.com/antanst/go_errors v0.0.1 h1:55BJ8I3u9IeLJxVslbI8Hv8fM0+fWyIE2VQXuwuYg9Y=
-github.com/antanst/go_errors v0.0.1/go.mod h1:VDiDlRB7JfRhr6GMqdChBGT1XTBIfzELhg3Yq7sVwhM=
-github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
 github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
-github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/guregu/null/v5 v5.0.0 h1:PRxjqyOekS11W+w/7Vfz6jgJE/BCwELWtgvOJzddimw=
 github.com/guregu/null/v5 v5.0.0/go.mod h1:SjupzNy+sCPtwQTKWhUCqjhVCO69hpsl2QsZrWHjlwU=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -28,25 +24,12 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
-github.com/matoous/go-nanoid/v2 v2.1.0 h1:P64+dmq21hhWdtvZfEAofnvJULaRR1Yib0+PnU669bE=
-github.com/matoous/go-nanoid/v2 v2.1.0/go.mod h1:KlbGNQ+FhrUNIHUxZdL63t7tl4LaPkZNpUULS8H4uVM=
-github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
-github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
-github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
-github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
 github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
-github.com/rs/xid v1.5.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
-github.com/rs/zerolog v1.33.0 h1:1cU2KZkvPxNyfgEmhHAz/1A9Bz+llsdYzklWFzgp0r8=
-github.com/rs/zerolog v1.33.0/go.mod h1:/7mN4D5sKwJLZQ2b/znpjC3/GQWY/xaDXUM0kKWRHss=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -56,11 +39,6 @@ golang.org/x/crypto v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
 golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
 golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
 golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
-golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
 golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

gopher/errors.go

@@ -1,6 +1,6 @@
 package gopher
 
-import "github.com/antanst/go_errors"
+import "errors"
 
 // GopherError is an error encountered while
 // visiting a Gopher host, and is only for
@@ -26,5 +26,5 @@ func IsGopherError(err error) bool {
 		return false
 	}
 	var asError *GopherError
-	return go_errors.As(err, &asError)
+	return errors.As(err, &asError)
 }

gopher/network.go

@@ -1,6 +1,7 @@
 package gopher
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -8,18 +9,11 @@ import (
 	"regexp"
 	"strings"
 	"time"
-	"unicode/utf8"
 
-	errors2 "gemini-grc/common/errors"
-	"gemini-grc/common/linkList"
-	"gemini-grc/common/snapshot"
-	"gemini-grc/common/text"
-	_url "gemini-grc/common/url"
+	commonErrors "gemini-grc/common/errors"
 	"gemini-grc/config"
-	"gemini-grc/logging"
-
-	"github.com/antanst/go_errors"
-	"github.com/guregu/null/v5"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 )
 
 // References:
@@ -63,64 +57,10 @@ import (
 // The original Gopher protocol only specified types 0-9, `+`, `g`, `I`, and `T`.
 // The others were added by various implementations and extensions over time.
 
-// Error methodology:
-// HostError for DNS/network errors
-// GopherError for network/gopher errors
-// NewError for other errors
-// NewFatalError for other fatal errors
-
-func Visit(url string) (*snapshot.Snapshot, error) {
-	s, err := snapshot.SnapshotFromURL(url, false)
-	if err != nil {
-		return nil, err
-	}
-
-	data, err := connectAndGetData(url)
-	if err != nil {
-		logging.LogDebug("Error: %s", err.Error())
-		if IsGopherError(err) || errors2.IsHostError(err) {
-			s.Error = null.StringFrom(err.Error())
-			return s, nil
-		}
-		return nil, err
-	}
-
-	isValidUTF8 := utf8.ValidString(string(data))
-	if isValidUTF8 {
-		s.GemText = null.StringFrom(text.RemoveNullChars(string(data)))
-	} else {
-		s.Data = null.ValueFrom(data)
-	}
-
-	if !isValidUTF8 {
-		return s, nil
-	}
-
-	responseError := checkForError(string(data))
-	if responseError != nil {
-		s.Error = null.StringFrom(responseError.Error())
-		return s, nil
-	}
-
-	links := getGopherPageLinks(string(data))
-	linkURLs := linkList.LinkList(make([]_url.URL, len(links)))
-	for i, link := range links {
-		linkURL, err := _url.ParseURL(link, "", true)
-		if err == nil {
-			linkURLs[i] = *linkURL
-		}
-	}
-	if len(links) != 0 {
-		s.Links = null.ValueFrom(linkURLs)
-	}
-
-	return s, nil
-}
-
 func connectAndGetData(url string) ([]byte, error) {
 	parsedURL, err := stdurl.Parse(url)
 	if err != nil {
-		return nil, go_errors.NewError(err)
+		return nil, xerrors.NewError(fmt.Errorf("error parsing URL: %w", err), 0, "", false)
 	}
 
 	hostname := parsedURL.Hostname()
@@ -137,7 +77,7 @@ func connectAndGetData(url string) ([]byte, error) {
 	logging.LogDebug("Dialing %s", host)
 	conn, err := dialer.Dial("tcp", host)
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, commonErrors.NewHostError(err)
 	}
 	// Make sure we always close the connection.
 	defer func() {
@@ -147,11 +87,11 @@ func connectAndGetData(url string) ([]byte, error) {
 	// Set read and write timeouts on the TCP connection.
 	err = conn.SetReadDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, commonErrors.NewHostError(err)
 	}
 	err = conn.SetWriteDeadline(time.Now().Add(timeoutDuration))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, commonErrors.NewHostError(err)
 	}
 
 	// We read `buf`-sized chunks and add data to `data`.
@@ -162,7 +102,7 @@ func connectAndGetData(url string) ([]byte, error) {
 	payload := constructPayloadFromPath(parsedURL.Path)
 	_, err = conn.Write([]byte(fmt.Sprintf("%s\r\n", payload)))
 	if err != nil {
-		return nil, errors2.NewHostError(err)
+		return nil, commonErrors.NewHostError(err)
 	}
 	// Read response bytes in len(buf) byte chunks
 	for {
@@ -171,13 +111,13 @@ func connectAndGetData(url string) ([]byte, error) {
 			data = append(data, buf[:n]...)
 		}
 		if err != nil {
-			if go_errors.Is(err, io.EOF) {
+			if errors.Is(err, io.EOF) {
 				break
 			}
-			return nil, errors2.NewHostError(err)
+			return nil, commonErrors.NewHostError(err)
 		}
 		if len(data) > config.CONFIG.MaxResponseSize {
-			return nil, errors2.NewHostError(fmt.Errorf("response exceeded max"))
+			return nil, commonErrors.NewHostError(fmt.Errorf("response exceeded max"))
 		}
 	}
 	logging.LogDebug("Got %d bytes", len(data))

gopher/network_context.go

@@ -0,0 +1,205 @@
+package gopher
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	stdurl "net/url"
+	"time"
+	"unicode/utf8"
+
+	"gemini-grc/common/contextlog"
+	commonErrors "gemini-grc/common/errors"
+	"gemini-grc/common/linkList"
+	"gemini-grc/common/snapshot"
+	"gemini-grc/common/text"
+	_url "gemini-grc/common/url"
+	"gemini-grc/config"
+	"gemini-grc/contextutil"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
+	"github.com/guregu/null/v5"
+)
+
+// VisitWithContext is a context-aware version of Visit that visits
+// a given URL using the Gopher protocol. It uses the context for
+// cancellation, timeout, and logging.
+func VisitWithContext(ctx context.Context, url string) (*snapshot.Snapshot, error) {
+	// Create a gopher-specific context with the "gopher" component
+	gopherCtx := contextutil.ContextWithComponent(ctx, "gopher")
+
+	if !config.CONFIG.GopherEnable {
+		contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Gopher protocol is disabled")
+		return nil, nil
+	}
+
+	s, err := snapshot.SnapshotFromURL(url, true)
+	if err != nil {
+		contextlog.LogErrorWithContext(gopherCtx, logging.GetSlogger(), "Failed to create snapshot from URL: %v", err)
+		return nil, err
+	}
+
+	// Check if the context is canceled
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	data, err := connectAndGetDataWithContext(gopherCtx, url)
+	if err != nil {
+		contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Error: %s", err.Error())
+		if IsGopherError(err) || commonErrors.IsHostError(err) {
+			s.Error = null.StringFrom(err.Error())
+			return s, nil
+		}
+		return nil, err
+	}
+
+	// Check if the context is canceled
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	isValidUTF8 := utf8.ValidString(string(data))
+	if isValidUTF8 {
+		s.GemText = null.StringFrom(text.RemoveNullChars(string(data)))
+		contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Response is valid UTF-8 text (%d bytes)", len(data))
+	} else {
+		s.Data = null.ValueFrom(data)
+		contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Response is binary data (%d bytes)", len(data))
+	}
+
+	if !isValidUTF8 {
+		return s, nil
+	}
+
+	responseError := checkForError(string(data))
+	if responseError != nil {
+		contextlog.LogErrorWithContext(gopherCtx, logging.GetSlogger(), "Gopher server returned error: %v", responseError)
+		s.Error = null.StringFrom(responseError.Error())
+		return s, nil
+	}
+
+	// Extract links from the response
+	links := getGopherPageLinks(string(data))
+	linkURLs := linkList.LinkList(make([]_url.URL, len(links)))
+
+	for i, link := range links {
+		linkURL, err := _url.ParseURL(link, "", true)
+		if err == nil {
+			linkURLs[i] = *linkURL
+		}
+	}
+
+	if len(links) != 0 {
+		s.Links = null.ValueFrom(linkURLs)
+		contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Found %d links in gopher page", len(links))
+	}
+
+	contextlog.LogDebugWithContext(gopherCtx, logging.GetSlogger(), "Successfully visited Gopher URL: %s", url)
+	return s, nil
+}
+
+// connectAndGetDataWithContext is a context-aware version of connectAndGetData
+func connectAndGetDataWithContext(ctx context.Context, url string) ([]byte, error) {
+	parsedURL, err := stdurl.Parse(url)
+	if err != nil {
+		return nil, xerrors.NewError(fmt.Errorf("error parsing URL: %w", err), 0, "", false)
+	}
+
+	hostname := parsedURL.Hostname()
+	port := parsedURL.Port()
+	if port == "" {
+		port = "70"
+	}
+	host := fmt.Sprintf("%s:%s", hostname, port)
+
+	// Use the context's deadline if it has one, otherwise use the config timeout
+	var timeoutDuration time.Duration
+	deadline, ok := ctx.Deadline()
+	if ok {
+		timeoutDuration = time.Until(deadline)
+	} else {
+		timeoutDuration = time.Duration(config.CONFIG.ResponseTimeout) * time.Second
+	}
+
+	// Check if the context is canceled
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Dialing %s", host)
+
+	// Establish the underlying TCP connection with context-based cancellation
+	dialer := &net.Dialer{
+		Timeout: timeoutDuration,
+	}
+
+	// Use DialContext to allow cancellation via context
+	conn, err := dialer.DialContext(ctx, "tcp", host)
+	if err != nil {
+		contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Failed to connect: %v", err)
+		return nil, commonErrors.NewHostError(err)
+	}
+
+	// Make sure we always close the connection
+	defer func() {
+		_ = conn.Close()
+	}()
+
+	// Set read and write timeouts on the TCP connection
+	err = conn.SetReadDeadline(time.Now().Add(timeoutDuration))
+	if err != nil {
+		return nil, commonErrors.NewHostError(err)
+	}
+	err = conn.SetWriteDeadline(time.Now().Add(timeoutDuration))
+	if err != nil {
+		return nil, commonErrors.NewHostError(err)
+	}
+
+	// We read `buf`-sized chunks and add data to `data`
+	buf := make([]byte, 4096)
+	var data []byte
+
+	// Check if the context is canceled before sending request
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	// Send Gopher request to trigger server response
+	payload := constructPayloadFromPath(parsedURL.Path)
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Sending request with payload: %s", payload)
+	_, err = conn.Write([]byte(fmt.Sprintf("%s\r\n", payload)))
+	if err != nil {
+		contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Failed to send request: %v", err)
+		return nil, commonErrors.NewHostError(err)
+	}
+
+	// Read response bytes in len(buf) byte chunks
+	for {
+		// Check if the context is canceled before each read
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+
+		n, err := conn.Read(buf)
+		if n > 0 {
+			data = append(data, buf[:n]...)
+		}
+		if err != nil {
+			if errors.Is(err, io.EOF) {
+				break
+			}
+			contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Error reading data: %v", err)
+			return nil, commonErrors.NewHostError(err)
+		}
+		if len(data) > config.CONFIG.MaxResponseSize {
+			contextlog.LogErrorWithContext(ctx, logging.GetSlogger(), "Response too large (max: %d bytes)", config.CONFIG.MaxResponseSize)
+			return nil, commonErrors.NewHostError(fmt.Errorf("response exceeded max"))
+		}
+	}
+
+	contextlog.LogDebugWithContext(ctx, logging.GetSlogger(), "Received %d bytes", len(data))
+	return data, nil
+}

gopher/network_test.go

@@ -288,7 +288,7 @@ func TestConnectAndGetDataTimeout(t *testing.T) {
 	// Check if the error is due to timeout
 	if err == nil {
 		t.Error("Expected an error due to timeout, but got no error")
-	} else if !errors.IsHostError(err) {
+	} else if !commonErrors.IsHostError(err) {
 		t.Errorf("Expected a HostError, but got: %v", err)
 	} else {
 		// Here you might want to check if the specific error message contains 'timeout'

hostPool/hostPool.go

@@ -1,49 +1,75 @@
 package hostPool
 
 import (
+	"context"
+	"math/rand"
 	"sync"
 	"time"
 
-	"gemini-grc/logging"
+	"gemini-grc/common/contextlog"
+	"gemini-grc/contextutil"
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
 )
 
-var hostPool = HostPool{hostnames: make(map[string]struct{})} //nolint:gochecknoglobals
+var hostPool = HostPool{hostnames: make(map[string]struct{})}
 
 type HostPool struct {
 	hostnames map[string]struct{}
 	lock      sync.RWMutex
 }
 
-//func (p *HostPool) add(key string) {
-//	p.lock.Lock()
-//	defer p.lock.Unlock()
-//	p.hostnames[key] = struct{}{}
-//}
-//
-//func (p *HostPool) has(key string) bool {
-//	p.lock.RLock()
-//	defer p.lock.RUnlock()
-//	_, ok := p.hostnames[key]
-//	return ok
-//}
-
-func RemoveHostFromPool(key string) {
+// RemoveHostFromPool removes a host from the pool with context awareness
+func RemoveHostFromPool(ctx context.Context, key string) {
+	hostCtx := contextutil.ContextWithComponent(ctx, "hostPool")
 	hostPool.lock.Lock()
-	defer hostPool.lock.Unlock()
 	delete(hostPool.hostnames, key)
+	hostPool.lock.Unlock()
+
+	// Add some jitter
+	time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
+	contextlog.LogDebugWithContext(hostCtx, logging.GetSlogger(), "Host %s removed from pool", key)
 }
 
-func AddHostToHostPool(key string) {
+// AddHostToHostPool adds a host to the host pool with context awareness.
+// Blocks until the host is added or the context is canceled.
+func AddHostToHostPool(ctx context.Context, key string) error {
+	// Create a hostPool-specific context
+	hostCtx := contextutil.ContextWithComponent(ctx, "hostPool")
+
+	// Use a ticker to periodically check if we can add the host
+	ticker := time.NewTicker(500 * time.Millisecond)
+	defer ticker.Stop()
+
+	// We continuously poll the pool,
+	// and if the host isn't already
+	// there, we add it.
 	for {
+		// Check if context is done before attempting to acquire lock
+		select {
+		case <-ctx.Done():
+			return xerrors.NewSimpleError(ctx.Err())
+		default:
+			// Continue with attempt to add host
+		}
+
 		hostPool.lock.Lock()
 		_, exists := hostPool.hostnames[key]
 		if !exists {
 			hostPool.hostnames[key] = struct{}{}
 			hostPool.lock.Unlock()
-			return
+			contextlog.LogDebugWithContext(hostCtx, logging.GetSlogger(), "Added host %s to pool", key)
+			return nil
 		}
 		hostPool.lock.Unlock()
-		time.Sleep(1 * time.Second)
-		logging.LogInfo("Waiting to add %s to pool...", key)
+
+		// Wait for next tick or context cancellation
+		select {
+		case <-ticker.C:
+			// Try again on next tick
+		case <-ctx.Done():
+			contextlog.LogDebugWithContext(hostCtx, logging.GetSlogger(), "Context canceled while waiting for host %s", key)
+			return xerrors.NewSimpleError(ctx.Err())
+		}
 	}
 }

logging/logging.go

@@ -1,23 +0,0 @@
-package logging
-
-import (
-	"fmt"
-
-	zlog "github.com/rs/zerolog/log"
-)
-
-func LogDebug(format string, args ...interface{}) {
-	zlog.Debug().Msg(fmt.Sprintf(format, args...))
-}
-
-func LogInfo(format string, args ...interface{}) {
-	zlog.Info().Msg(fmt.Sprintf(format, args...))
-}
-
-func LogWarn(format string, args ...interface{}) {
-	zlog.Warn().Msg(fmt.Sprintf(format, args...))
-}
-
-func LogError(format string, args ...interface{}) {
-	zlog.Error().Err(fmt.Errorf(format, args...)).Msg("")
-}

main.go

@@ -1,82 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-	"os/signal"
-	"syscall"
-
-	"gemini-grc/common"
-	"gemini-grc/common/blackList"
-	"gemini-grc/config"
-	"gemini-grc/db"
-	"gemini-grc/logging"
-	"github.com/antanst/go_errors"
-	"github.com/jmoiron/sqlx"
-	"github.com/rs/zerolog"
-	zlog "github.com/rs/zerolog/log"
-)
-
-func main() {
-	config.CONFIG = *config.GetConfig()
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-	zerolog.SetGlobalLevel(config.CONFIG.LogLevel)
-	zlog.Logger = zlog.Output(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: "[2006-01-02 15:04:05]"})
-	err := runApp()
-	if err != nil {
-		var asErr *go_errors.Error
-		if go_errors.As(err, &asErr) {
-			logging.LogError("Unexpected error: %v", err)
-			_, _ = fmt.Fprintf(os.Stderr, "Unexpected error: %v", err)
-		} else {
-			logging.LogError("Unexpected error: %v", err)
-		}
-		os.Exit(1)
-	}
-}
-
-func runApp() (err error) {
-	logging.LogInfo("gemcrawl %s starting up. Press Ctrl+C to exit", common.VERSION)
-	signals := make(chan os.Signal, 1)
-	signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
-
-	_db, err := db.ConnectToDB()
-	if err != nil {
-		return err
-	}
-
-	defer func(db *sqlx.DB) {
-		_ = db.Close()
-	}(_db)
-
-	err = blackList.LoadBlacklist()
-	if err != nil {
-		return err
-	}
-
-	common.StatusChan = make(chan common.WorkerStatus, config.CONFIG.NumOfWorkers)
-	common.ErrorsChan = make(chan error, config.CONFIG.NumOfWorkers)
-
-	// If there's an argument, visit this
-	// URL only and don't spawn other workers
-	if len(os.Args) > 1 {
-		url := os.Args[1]
-		err = common.CrawlOneURL(_db, &url)
-		return err
-	}
-
-	go common.SpawnWorkers(config.CONFIG.NumOfWorkers, _db)
-
-	for {
-		select {
-		case <-signals:
-			logging.LogWarn("Received SIGINT or SIGTERM signal, exiting")
-			return nil
-		case err := <-common.ErrorsChan:
-			if go_errors.IsFatal(err) {
-				return err
-			}
-			logging.LogError("%s", fmt.Sprintf("%v", err))
-		}
-	}
-}

misc/sql/README.md

@@ -0,0 +1,28 @@
+# SQL Queries for Snapshot Analysis
+
+This directory contains SQL queries to analyze snapshot data in the gemini-grc database.
+
+## Usage
+
+You can run these queries directly from psql using the `\i` directive:
+
+```
+\i misc/sql/snapshots_per_url.sql
+```
+
+## Available Queries
+
+- **snapshots_per_url.sql** - Basic count of snapshots per URL
+- **snapshots_date_range.sql** - Shows snapshot count with date range information for each URL
+- **host_snapshot_stats.sql** - Groups snapshots by hosts and shows URLs with multiple snapshots
+- **content_changes.sql** - Finds URLs with the most content changes between consecutive snapshots
+- **snapshot_distribution.sql** - Shows the distribution of snapshots per URL (how many URLs have 1, 2, 3, etc. snapshots)
+- **recent_snapshot_activity.sql** - Shows URLs with most snapshots in the last 7 days
+- **storage_efficiency.sql** - Shows potential storage savings from deduplication
+- **snapshots_by_timeframe.sql** - Shows snapshot count by timeframe (day, week, month)
+
+## Notes
+
+- These queries are designed to work with PostgreSQL and the gemini-grc database schema
+- Some queries may be resource-intensive on large databases
+- The results can help optimize storage and understand the effectiveness of the versioned snapshot feature

misc/sql/cleanup_duplicate_snapshots.sql

@@ -0,0 +1,19 @@
+WITH snapshot_rankings AS (
+      SELECT
+          id,
+          url,
+          ROW_NUMBER() OVER (
+              PARTITION BY url
+              ORDER BY
+                  CASE WHEN (gemtext IS NOT NULL AND gemtext != '') OR data IS NOT NULL
+                       THEN 0 ELSE 1 END,
+                  timestamp DESC
+          ) as rn
+      FROM snapshots
+  )
+  DELETE FROM snapshots
+  WHERE id IN (
+      SELECT id
+      FROM snapshot_rankings
+      WHERE rn > 1
+  );

misc/sql/content_changes.sql

@@ -0,0 +1,26 @@
+-- File: content_changes.sql
+-- Finds URLs with the most content changes between consecutive snapshots
+-- Usage: \i misc/sql/content_changes.sql
+
+WITH snapshot_changes AS (
+    SELECT 
+        s1.url,
+        s1.timestamp as prev_timestamp,
+        s2.timestamp as next_timestamp,
+        s1.gemtext IS DISTINCT FROM s2.gemtext as gemtext_changed,
+        s1.data IS DISTINCT FROM s2.data as data_changed
+    FROM snapshots s1
+    JOIN snapshots s2 ON s1.url = s2.url AND s1.timestamp < s2.timestamp
+    WHERE NOT EXISTS (
+        SELECT 1 FROM snapshots s3
+        WHERE s3.url = s1.url AND s1.timestamp < s3.timestamp AND s3.timestamp < s2.timestamp
+    )
+)
+SELECT 
+    url,
+    COUNT(*) + 1 as snapshot_count,
+    SUM(CASE WHEN gemtext_changed OR data_changed THEN 1 ELSE 0 END) as content_changes
+FROM snapshot_changes
+GROUP BY url
+HAVING COUNT(*) + 1 > 1
+ORDER BY content_changes DESC, snapshot_count DESC;

misc/sql/crawl_top_level.sql

@@ -0,0 +1,30 @@
+BEGIN;
+
+WITH matching_urls AS (
+    SELECT url, host
+    FROM snapshots
+    WHERE url ~ '^gemini://[^/]+/$'
+      AND timestamp < (NOW() - INTERVAL '1 week')
+    ORDER BY random()
+    LIMIT 500
+)
+INSERT INTO urls (url, host)
+SELECT url, host
+FROM matching_urls
+ON CONFLICT DO NOTHING;
+
+-- WITH matching_urls AS (
+--     SELECT url, host
+--     FROM snapshots
+--     WHERE url ~ '^gemini://[^/]+/$'
+--       AND timestamp < (NOW() - INTERVAL '1 week')
+--     ORDER BY random()
+--     LIMIT 500
+-- )
+-- DELETE FROM snapshots
+-- WHERE url IN (
+--     SELECT url
+--     FROM matching_urls
+-- );
+
+COMMIT;

misc/sql/fetch-snapshot-history.sql

@@ -0,0 +1,6 @@
+select count(*) from snapshots
+  where last_crawled < now() - interval '30 days'
+    and error IS NULL
+    and gemtext IS NOT NULL
+    and mimetype='text/gemini'
+    and url ~ '^gemini://[^/]+/?$';

misc/sql/host_snapshot_stats.sql

@@ -0,0 +1,20 @@
+-- File: host_snapshot_stats.sql
+-- Groups snapshots by hosts and shows URLs with multiple snapshots
+-- Usage: \i misc/sql/host_snapshot_stats.sql
+
+SELECT 
+    host,
+    COUNT(DISTINCT url) as unique_urls,
+    SUM(CASE WHEN url_count > 1 THEN 1 ELSE 0 END) as urls_with_multiple_snapshots,
+    SUM(snapshot_count) as total_snapshots
+FROM (
+    SELECT 
+        host, 
+        url, 
+        COUNT(*) as snapshot_count,
+        COUNT(*) OVER (PARTITION BY url) as url_count
+    FROM snapshots
+    GROUP BY host, url
+) subquery
+GROUP BY host
+ORDER BY total_snapshots DESC;

misc/sql/initdb.sql

@@ -0,0 +1,46 @@
+DROP TABLE IF EXISTS snapshots;
+DROP TABLE IF EXISTS urls;
+
+CREATE TABLE urls (
+    id SERIAL PRIMARY KEY,
+    url TEXT NOT NULL,
+    host TEXT NOT NULL,
+    timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    being_processed BOOLEAN
+);
+
+CREATE UNIQUE INDEX urls_url_key ON urls (url);
+CREATE INDEX idx_urls_url ON urls (url);
+CREATE INDEX idx_urls_timestamp ON urls (timestamp);
+CREATE INDEX idx_being_processed ON urls (being_processed);
+
+CREATE TABLE snapshots (
+    id SERIAL PRIMARY KEY,
+    url TEXT NOT NULL,
+    host TEXT NOT NULL,
+    timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    mimetype TEXT,
+    data BYTEA,
+    gemtext TEXT,
+    links JSONB,
+    lang TEXT,
+    response_code INTEGER,
+    error TEXT,
+    header TEXT,
+    last_crawled TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE UNIQUE INDEX idx_url_timestamp ON snapshots (url, timestamp);
+CREATE INDEX idx_url ON snapshots (url);
+CREATE INDEX idx_timestamp ON snapshots (timestamp);
+CREATE INDEX idx_mimetype ON snapshots (mimetype);
+CREATE INDEX idx_lang ON snapshots (lang);
+CREATE INDEX idx_response_code ON snapshots (response_code);
+CREATE INDEX idx_error ON snapshots (error);
+CREATE INDEX idx_host ON snapshots (host);
+CREATE INDEX idx_response_code_error ON snapshots (response_code, error);
+CREATE INDEX idx_response_code_error_nulls ON snapshots (response_code, error) WHERE response_code IS NULL AND error IS NULL;
+CREATE INDEX idx_snapshots_unprocessed ON snapshots (host) WHERE response_code IS NULL AND error IS NULL;
+CREATE INDEX idx_url_latest ON snapshots (url, timestamp DESC);
+CREATE INDEX idx_last_crawled ON snapshots (last_crawled);
+CREATE INDEX idx_url_last_crawled ON snapshots (url, last_crawled DESC);

misc/sql/mark_urls_processed_false.sql

@@ -0,0 +1 @@
+update urls set being_processed=false where being_processed is true;

misc/sql/recent_snapshot_activity.sql

@@ -0,0 +1,13 @@
+-- File: recent_snapshot_activity.sql
+-- Shows URLs with most snapshots in the last 7 days
+-- Usage: \i misc/sql/recent_snapshot_activity.sql
+
+SELECT 
+    url, 
+    COUNT(*) as snapshot_count
+FROM snapshots
+WHERE timestamp > NOW() - INTERVAL '7 days'
+GROUP BY url
+HAVING COUNT(*) > 1
+ORDER BY snapshot_count DESC
+LIMIT 20;

misc/sql/snapshot_distribution.sql

@@ -0,0 +1,16 @@
+-- File: snapshot_distribution.sql
+-- Shows the distribution of snapshots per URL (how many URLs have 1, 2, 3, etc. snapshots)
+-- Usage: \i misc/sql/snapshot_distribution.sql
+
+WITH counts AS (
+    SELECT url, COUNT(*) as snapshot_count
+    FROM snapshots
+    GROUP BY url
+)
+SELECT 
+    snapshot_count,
+    COUNT(*) as url_count,
+    ROUND(COUNT(*) * 100.0 / SUM(COUNT(*)) OVER (), 2) as percentage
+FROM counts
+GROUP BY snapshot_count
+ORDER BY snapshot_count;

misc/sql/snapshots_by_timeframe.sql

@@ -0,0 +1,37 @@
+-- File: snapshots_by_timeframe.sql
+-- Shows snapshot count by timeframe (day, week, month)
+-- Usage: \i misc/sql/snapshots_by_timeframe.sql
+
+WITH daily_snapshots AS (
+    SELECT 
+        date_trunc('day', timestamp) as day,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY day
+    ORDER BY day
+),
+weekly_snapshots AS (
+    SELECT 
+        date_trunc('week', timestamp) as week,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY week
+    ORDER BY week
+),
+monthly_snapshots AS (
+    SELECT 
+        date_trunc('month', timestamp) as month,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY month
+    ORDER BY month
+)
+SELECT 'Daily' as timeframe, * FROM daily_snapshots
+UNION ALL
+SELECT 'Weekly' as timeframe, * FROM weekly_snapshots
+UNION ALL
+SELECT 'Monthly' as timeframe, * FROM monthly_snapshots
+ORDER BY timeframe, day;

misc/sql/snapshots_date_range.sql

@@ -0,0 +1,14 @@
+-- File: snapshots_date_range.sql
+-- Shows snapshot count with date range information for each URL
+-- Usage: \i misc/sql/snapshots_date_range.sql
+
+SELECT 
+    url, 
+    COUNT(*) as snapshot_count,
+    MIN(timestamp) as first_snapshot,
+    MAX(timestamp) as last_snapshot,
+    MAX(timestamp) - MIN(timestamp) as time_span
+FROM snapshots
+GROUP BY url
+HAVING COUNT(*) > 1
+ORDER BY snapshot_count DESC;

misc/sql/snapshots_per_url.sql

@@ -0,0 +1,8 @@
+-- File: snapshots_per_url.sql
+-- Basic count of snapshots per URL
+-- Usage: \i misc/sql/snapshots_per_url.sql
+
+SELECT url, COUNT(*) as snapshot_count
+FROM snapshots
+GROUP BY url
+ORDER BY snapshot_count DESC;

misc/sql/storage_efficiency.sql

@@ -0,0 +1,20 @@
+-- File: storage_efficiency.sql
+-- Shows potential storage savings from deduplication
+-- Usage: \i misc/sql/storage_efficiency.sql
+
+WITH duplicate_stats AS (
+    SELECT 
+        url,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT gemtext) as unique_gemtexts,
+        COUNT(DISTINCT data) as unique_datas
+    FROM snapshots
+    GROUP BY url
+    HAVING COUNT(*) > 1
+)
+SELECT 
+    SUM(snapshot_count) as total_snapshots,
+    SUM(unique_gemtexts + unique_datas) as unique_contents,
+    SUM(snapshot_count) - SUM(unique_gemtexts + unique_datas) as duplicate_content_count,
+    ROUND((SUM(snapshot_count) - SUM(unique_gemtexts + unique_datas)) * 100.0 / SUM(snapshot_count), 2) as duplicate_percentage
+FROM duplicate_stats;

robotsMatch/robots.go

@@ -0,0 +1,73 @@
+package robotsMatch
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"gemini-grc/common/contextlog"
+	"gemini-grc/contextutil"
+	"git.antanst.com/antanst/logging"
+)
+
+// ParseRobotsTxt takes robots.txt content and a host, and
+// returns a list of full URLs that shouldn't be visited.
+// This is the legacy version without context support.
+// TODO Also take into account the user agent?
+// Check gemini://geminiprotocol.net/docs/companion/robots.gmi
+func ParseRobotsTxt(content string, host string) []string {
+	// Call the context-aware version with a background context
+	return ParseRobotsTxtWithContext(context.Background(), content, host)
+}
+
+// ParseRobotsTxtWithContext takes robots.txt content and a host, and
+// returns a list of full URLs that shouldn't be visited.
+// This version supports context for logging.
+// TODO Also take into account the user agent?
+// Check gemini://geminiprotocol.net/docs/companion/robots.gmi
+func ParseRobotsTxtWithContext(ctx context.Context, content string, host string) []string {
+	// Create a context for robots.txt parsing
+	parseCtx := contextutil.ContextWithComponent(ctx, "robotsMatch.parser")
+
+	var disallowedPaths []string
+	for _, line := range strings.Split(content, "\n") {
+		line = strings.TrimSpace(line)
+		line = strings.ToLower(line)
+		if strings.HasPrefix(line, "disallow:") {
+			parts := strings.SplitN(line, ":", 2)
+			if len(parts) == 2 {
+				path := strings.TrimSpace(parts[1])
+				if path != "" {
+					// Construct full Gemini URL
+					var fullURL string
+
+					// Handle if the path is already a full URL
+					if strings.HasPrefix(path, "gemini://") {
+						// Extract just the path from the full URL
+						urlParts := strings.SplitN(path, "/", 4)
+						if len(urlParts) >= 4 {
+							// Get the path part (everything after the domain)
+							pathPart := "/" + urlParts[3]
+							fullURL = fmt.Sprintf("gemini://%s%s", host, pathPart)
+						} else {
+							// If it's just a domain without a path, skip it or use root path
+							fullURL = fmt.Sprintf("gemini://%s/", host)
+						}
+					} else {
+						// It's a relative path, just add it to the host
+						if !strings.HasPrefix(path, "/") {
+							path = "/" + path
+						}
+						fullURL = fmt.Sprintf("gemini://%s%s", host, path)
+					}
+
+					disallowedPaths = append(disallowedPaths, fullURL)
+
+					// Add additional logging to debug robots.txt parsing
+					contextlog.LogDebugWithContext(parseCtx, logging.GetSlogger(), "Added robots.txt disallow rule: %s from original: %s", fullURL, path)
+				}
+			}
+		}
+	}
+	return disallowedPaths
+}

robotsMatch/robotsMatch.go

@@ -0,0 +1,161 @@
+package robotsMatch
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+
+	"gemini-grc/common/contextlog"
+	"gemini-grc/common/snapshot"
+	geminiUrl "gemini-grc/common/url"
+	"gemini-grc/config"
+	"gemini-grc/contextutil"
+	"gemini-grc/gemini"
+	"git.antanst.com/antanst/logging"
+)
+
+// RobotsCache is a map of blocked URLs
+// key: URL
+// value: []string list of disallowed URLs
+// If a key has no blocked URLs, an empty
+// list is stored for caching.
+var RobotsCache sync.Map //nolint:gochecknoglobals
+
+func populateRobotsCache(ctx context.Context, key string) (entries []string, _err error) {
+	// Create a context for robots cache population
+	cacheCtx := contextutil.ContextWithComponent(ctx, "robotsCache")
+
+	// We either store an empty list when
+	// no rules, or a list of disallowed URLs.
+	// This applies even if we have an error
+	// finding/downloading robots.txt
+	defer func() {
+		RobotsCache.Store(key, entries)
+	}()
+
+	url := fmt.Sprintf("gemini://%s/robots.txt", key)
+	contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "Fetching robots.txt from %s", url)
+
+	// Use the context-aware version to honor timeout and cancellation
+	robotsContent, err := gemini.ConnectAndGetData(cacheCtx, url)
+	if err != nil {
+		// Check for context timeout or cancellation specifically
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+			contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "Timeout or cancellation while fetching robots.txt: %v", err)
+			// Don't cache the result on timeout, to allow retrying later
+			return []string{}, err
+		}
+		// For other errors, we store an empty list for this host
+		// to avoid continually hitting it
+		contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "Failed to get robots.txt: %v", err)
+		RobotsCache.Store(key, []string{})
+		return []string{}, err
+	}
+
+	s, err := snapshot.SnapshotFromURL(url, true)
+	if err != nil {
+		contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "Failed to create snapshot from URL: %v", err)
+		return []string{}, nil
+	}
+
+	s = gemini.UpdateSnapshotWithData(*s, robotsContent)
+
+	if s.ResponseCode.ValueOrZero() != 20 {
+		contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "robots.txt error code %d, ignoring", s.ResponseCode.ValueOrZero())
+		return []string{}, nil
+	}
+
+	// Some return text/plain, others text/gemini.
+	// According to spec, the first is correct,
+	// however let's be lenient
+	var data string
+	switch {
+	case s.MimeType.ValueOrZero() == "text/plain":
+		data = string(s.Data.ValueOrZero())
+	case s.MimeType.ValueOrZero() == "text/gemini":
+		data = s.GemText.ValueOrZero()
+	default:
+		contextlog.LogDebugWithContext(cacheCtx, logging.GetSlogger(), "Unsupported mime type: %s", s.MimeType.ValueOrZero())
+		return []string{}, nil
+	}
+
+	entries = ParseRobotsTxtWithContext(ctx, data, key)
+	return entries, nil
+}
+
+// RobotMatch checks if the snapshot URL matches
+// a robots.txt allow rule.
+func RobotMatch(ctx context.Context, u string) bool {
+	// Create a context for robots operations
+	robotsCtx := contextutil.ContextWithComponent(ctx, "robotsMatch")
+
+	// TODO Missing Gopher functionality
+	if config.CONFIG.GopherEnable {
+		return false
+	}
+
+	url, err := geminiUrl.ParseURL(u, "", true)
+	if err != nil {
+		return false
+	}
+
+	key := strings.ToLower(fmt.Sprintf("%s:%d", url.Hostname, url.Port))
+	contextlog.LogDebugWithContext(robotsCtx, logging.GetSlogger(), "Checking robots.txt for URL: %s with host key: %s", u, key)
+
+	var disallowedURLs []string
+	cacheEntries, ok := RobotsCache.Load(key)
+	if !ok {
+		// First time check, populate robot cache
+		contextlog.LogDebugWithContext(robotsCtx, logging.GetSlogger(), "No robots.txt cache for %s, fetching...", key)
+		var fetchErr error
+		disallowedURLs, fetchErr = populateRobotsCache(ctx, key)
+		if fetchErr != nil {
+			return false
+		}
+		if len(disallowedURLs) > 0 {
+			contextlog.LogDebugWithContext(robotsCtx, logging.GetSlogger(), "Added to robots.txt cache: %v => %v", key, disallowedURLs)
+		} else {
+			contextlog.LogDebugWithContext(robotsCtx, logging.GetSlogger(), "No disallowed paths found in robots.txt for %s", key)
+		}
+	} else {
+		var ok bool
+		disallowedURLs, ok = cacheEntries.([]string)
+		if !ok {
+			contextlog.LogErrorWithContext(robotsCtx, logging.GetSlogger(), "Invalid type in robots.txt cache for %s", key)
+			disallowedURLs = []string{} // Use empty list as fallback
+		}
+		contextlog.LogDebugWithContext(robotsCtx, logging.GetSlogger(), "Found %d disallowed paths in robots.txt cache for %s", len(disallowedURLs), key)
+	}
+	return isURLblocked(ctx, disallowedURLs, url.Full)
+}
+
+// Initialize initializes the robots.txt match package
+func Initialize() error {
+	logging.LogDebug("Initializing robotsMatch package")
+	return nil
+}
+
+// Shutdown cleans up the robots.txt match package
+func Shutdown() error {
+	logging.LogDebug("Shutting down robotsMatch package")
+	return nil
+}
+
+func isURLblocked(ctx context.Context, disallowedURLs []string, input string) bool {
+	// Create a context for URL blocking checks
+	blockCtx := contextutil.ContextWithComponent(ctx, "robotsMatch.isURLblocked")
+
+	inputLower := strings.ToLower(input)
+
+	for _, url := range disallowedURLs {
+		urlLower := strings.ToLower(url)
+		if strings.HasPrefix(inputLower, urlLower) {
+			contextlog.LogDebugWithContext(blockCtx, logging.GetSlogger(), "MATCH! robots.txt rule: %s blocks URL: %s", url, input)
+			return true
+		}
+	}
+	contextlog.LogDebugWithContext(blockCtx, logging.GetSlogger(), "No robots.txt rules matched URL: %s", input)
+	return false
+}

robotsMatch/robotsMatch_test.go

@@ -0,0 +1,40 @@
+package robotsMatch
+
+import (
+	"context"
+	"sync"
+	"testing"
+
+	"gemini-grc/config"
+)
+
+func TestInitializeShutdown(t *testing.T) {
+	err := Initialize()
+	if err != nil {
+		t.Errorf("Initialize() failed: %v", err)
+	}
+
+	err = Shutdown()
+	if err != nil {
+		t.Errorf("Shutdown() failed: %v", err)
+	}
+}
+
+func TestRobotMatch_EmptyCache(t *testing.T) {
+	// This test doesn't actually connect to gemini URLs due to the complexity
+	// of mocking the gemini client, but tests the caching behavior when no
+	// robots.txt is found (empty cache case)
+	config.CONFIG.ResponseTimeout = 5
+
+	// Clear the cache before testing
+	RobotsCache = sync.Map{}
+
+	// For empty cache or DNS errors, RobotMatch should return false (allow the URL) without an error
+	ctx := context.Background()
+	blocked := RobotMatch(ctx, "gemini://nonexistent.example.com/")
+
+	// The URL should be allowed (not blocked) when robots.txt can't be fetched
+	if blocked {
+		t.Errorf("Expected URL to be allowed when robots.txt can't be fetched")
+	}
+}

robotsMatch/robots_test.go

@@ -1,6 +1,7 @@
-package gemini
+package robotsMatch
 
 import (
+	"context"
 	"reflect"
 	"testing"
 )
@@ -44,12 +45,13 @@ func TestIsURLblocked(t *testing.T) {
 		"gemini://example.com/cgi-bin/wp.cgi/media",
 		"gemini://example.com/admin/",
 	}
+	ctx := context.Background()
 	url := "gemini://example.com/admin/index.html"
-	if !isURLblocked(disallowedURLs, url) {
+	if !isURLblocked(ctx, disallowedURLs, url) {
 		t.Errorf("Expected %s to be blocked", url)
 	}
 	url = "gemini://example1.com/admin/index.html"
-	if isURLblocked(disallowedURLs, url) {
+	if isURLblocked(ctx, disallowedURLs, url) {
 		t.Errorf("expected %s to not be blocked", url)
 	}
 }

seed_urls.txt

@@ -0,0 +1,10 @@
+gemini://geminiprotocol.net/
+gemini://warmedal.se/~antenna/
+gemini://skyjake.fi/~Cosmos/
+gemini://gemini.circumlunar.space/capcom/
+gemini://auragem.letz.dev/
+gemini://gemplex.space/
+gemini://kennedy.gemi.dev/
+gemini://tlgs.one/
+gemini://yesterday.gemlog.org/
+gemini://gemini.cyberbot.space/feed.gmi

test.txt

@@ -0,0 +1,22 @@
+# Test redirect full url:
+gemini://gemini.circumlunar.space 
+
+# Test blacklist:
+gemi.dev
+
+# Test robots disallow:
+gemini://tlgs.one/search?aa
+
+# Test TLS cert required:
+gemini://astrobotany.mozz.us/app/plant
+// 31 redirect
+gemini://gemini.circumlunar.space
+
+// body with null byte
+gemini://kennedy.gemi.dev/archive/cached?url=gemini://spam.works/mirrors/textfiles/fun/consult.how&t=638427244900000000&raw=False
+
+// has invalid url
+gemini://tlgs.one/known-hosts
+
+// Needs SNI TLS info (our bug)
+gemini://hanzbrix.pollux.casa/gemlog/20241002.gmi

uid/uid.go

@@ -1,14 +0,0 @@
-package uid
-
-import (
-	nanoid "github.com/matoous/go-nanoid/v2"
-)
-
-func UID() string {
-	// No 'o','O' and 'l'
-	id, err := nanoid.Generate("abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ0123456789", 20)
-	if err != nil {
-		panic(err)
-	}
-	return id
-}

util/util.go

@@ -6,14 +6,8 @@ import (
 	"fmt"
 	"math/big"
 	"regexp"
-	"runtime/debug"
 )
 
-func PrintStackAndPanic(err error) {
-	fmt.Printf("PANIC Error %s Stack trace:\n%s", err, debug.Stack())
-	panic("PANIC")
-}
-
 // SecureRandomInt returns a cryptographically secure random integer in the range [0,max).
 // Panics if max <= 0 or if there's an error reading from the system's secure
 // random number generator.
@@ -24,14 +18,14 @@ func SecureRandomInt(max int) int {
 	// Generate random number
 	n, err := rand.Int(rand.Reader, maxBig)
 	if err != nil {
-		PrintStackAndPanic(fmt.Errorf("could not generate a random integer between 0 and %d", max))
+		panic(fmt.Errorf("could not generate a random integer between 0 and %d", max))
 	}
 
 	// Convert back to int
 	return int(n.Int64())
 }
 
-func PrettyJson(data string) string {
+func PrettifyJson(data string) string {
 	marshalled, _ := json.MarshalIndent(data, "", "  ")
 	return fmt.Sprintf("%s\n", marshalled)
 }
@@ -42,3 +36,27 @@ func GetLinesMatchingRegex(input string, pattern string) []string {
 	matches := re.FindAllString(input, -1)
 	return matches
 }
+
+// Filter applies a predicate function to each element in a slice and returns a new slice
+// containing only the elements for which the predicate returns true.
+// Type parameter T allows this function to work with slices of any type.
+func Filter[T any](slice []T, f func(T) bool) []T {
+	filtered := make([]T, 0)
+	for _, v := range slice {
+		if f(v) {
+			filtered = append(filtered, v)
+		}
+	}
+	return filtered
+}
+
+// Map applies a function to each element in a slice and returns a new slice
+// containing the results.
+// Type parameters T and R allow this function to work with different input and output types.
+func Map[T any, R any](slice []T, f func(T) R) []R {
+	result := make([]R, len(slice))
+	for i, v := range slice {
+		result[i] = f(v)
+	}
+	return result
+}