Basic functionality

network.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"time"
+)
+
+func Visit(url string) (result *Result) {
+	result = &Result{}
+
+	// Wrap error with additional information
+	defer func() {
+		if result.error != nil {
+			result.error = fmt.Errorf("[%s] Error: %w", result.url, result.error)
+		}
+	}()
+
+	geminiUrl, err := ParseUrl(url, "")
+	if err != nil {
+		result.error = err
+		return result
+	}
+	result.url = *geminiUrl
+
+	LogInfo("[%s] Dialing", geminiUrl.String())
+
+	// Establish a TLS connection
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: true,
+	}
+	conn, err := tls.Dial("tcp", fmt.Sprintf("%s:%d", geminiUrl.hostname, geminiUrl.port), tlsConfig)
+	if err != nil {
+		result.error = err
+		return result
+	}
+	defer conn.Close()
+
+	// Read data from the connection
+	conn.SetReadDeadline(time.Now().Add(5 * time.Second))
+	buf := make([]byte, 1024)
+	var data []byte
+	// Write Gemini request to get response.
+	conn.Write([]byte(fmt.Sprintf("%s\r\n", geminiUrl.String())))
+	// Read response bytes in len(buf) byte chunks
+	for {
+		n, err := conn.Read(buf)
+		if n > 0 {
+			data = append(data, buf[:n]...)
+		}
+		if err != nil {
+			if err == io.EOF {
+				break
+			} else {
+				result.error = err
+				return result
+			}
+		}
+	}
+	LogInfo("[%s] Received %d bytes", geminiUrl.String(), len(data))
+	// time.Sleep(time.Duration(time.Second * 2))
+	// LogDebug("[%s] Visitor finished", geminiUrl.String())
+	result.data = string(data)
+	return result
+}