104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
package main
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import (
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"os"
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"sync"
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"github.com/rs/zerolog"
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zlog "github.com/rs/zerolog/log"
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)
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func main() {
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zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
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// zerolog.SetGlobalLevel(zerolog.DebugLevel)
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zerolog.SetGlobalLevel(zerolog.InfoLevel)
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zlog.Logger = zlog.Output(zerolog.ConsoleWriter{Out: os.Stderr})
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if err := runApp(); err != nil {
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LogError("Application error: %v", err)
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os.Exit(1)
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}
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}
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func runApp() error {
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urls := []string{"gemini://smol.gr"} //, "gemini://gmi.noulin.neta/", "gemini://in.gr:443"}
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queue := make(chan string)
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done := make(chan struct{})
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// Start the crawler.
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go crawler(queue, done)
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// Send URLs to the queue
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for _, url := range urls {
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// Send URL to queue; blocks until crawler receives it
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queue <- url
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}
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// All URLs have been sent and received
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// because queue is unbuffered; safe to close the queue
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close(queue)
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// Wait until crawler signals finish
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<-done
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return nil
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}
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func crawler(queue <-chan string, done chan struct{}) {
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// Start processing results.
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results := make(chan Result)
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resultsDone := make(chan struct{})
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go resultsHandler(results, resultsDone)
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// Create workers that consume the queue channel,
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// and send their result to results channel.
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workers := 3
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LogInfo("Spawning %d workers", workers)
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var wg sync.WaitGroup
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// Start worker goroutines
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for range workers {
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wg.Add(1)
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go func() {
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worker(queue, results)
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wg.Done()
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}()
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}
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// Wait until all workers have finished.
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wg.Wait()
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LogInfo("All workers have finished")
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// Nobody left to send to results, so we
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// close it, and the ResultsProcessor can
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// finish
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close(results)
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<-resultsDone
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close(done)
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}
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func resultsHandler(results <-chan Result, done chan struct{}) {
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for result := range results {
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if result.error != nil {
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LogError("%w", result.error)
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} else {
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LogInfo("[%s] Done. Result: %#v", result.url, result)
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}
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}
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LogInfo("All results have been processed")
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close(done)
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}
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func worker(queue <-chan string, results chan Result) {
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for url := range queue {
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result := Visit(url)
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// If we encountered an error when
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// visiting, skip processing
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if result.error != nil {
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results <- *result
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continue
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}
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result = Process(result)
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results <- *result
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}
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}
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