Implemented IRC functionality.

example/irc.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"log"
+
+	"github.com/d4l3k/go-electrum/irc"
+)
+
+func main() {
+	log.Println(irc.FindElectrumServers())
+}

irc/irc.go

@@ -0,0 +1,73 @@
+package irc
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/thoj/go-ircevent"
+)
+
+var (
+	UsernameTemplate = "go-electrum-%d"
+	IRCServer        = "chat.freenode.net:8000"
+	IRCChannel       = "#electrum"
+)
+
+// FindElectrumServersIRC finds nodes to connect to by connecting to the Freenode #electrum channel.
+func FindElectrumServers() ([]string, error) {
+	user := fmt.Sprintf(UsernameTemplate, rand.Int31())
+	ircobj := irc.IRC(user, user)
+	ircobj.UseTLS = false
+	ircobj.VerboseCallbackHandler = true
+	ircobj.TLSConfig = &tls.Config{
+		InsecureSkipVerify: true,
+	}
+	if err := ircobj.Connect(IRCServer); err != nil {
+		return nil, err
+	}
+	defer ircobj.Quit()
+	go ircobj.Loop()
+	ircobj.Join(IRCChannel)
+	ircobj.SendRawf("NAMES %s", IRCChannel)
+	var wg sync.WaitGroup
+	wg.Add(1)
+	// NAMES END
+	ircobj.AddCallback("366", func(event *irc.Event) {
+		// THIS IS RACY UGH. This irc library doesn't preserve order of callbacks.
+		time.Sleep(100 * time.Millisecond)
+		wg.Done()
+	})
+
+	// NAMES
+	ircobj.AddCallback("353", func(event *irc.Event) {
+		if len(event.Arguments) < 4 {
+			return
+		}
+		words := strings.Split(event.Arguments[3], " ")
+		for _, nick := range words {
+			if strings.HasPrefix(nick, "E_") {
+				wg.Add(1)
+				ircobj.Whois(nick)
+			}
+		}
+	})
+
+	var serversLock sync.Mutex
+	var servers []string
+
+	// WHOIS realname
+	ircobj.AddCallback("311", func(event *irc.Event) {
+		detailsLine := strings.TrimSpace(event.Arguments[len(event.Arguments)-1])
+		serversLock.Lock()
+		servers = append(servers, detailsLine)
+		serversLock.Unlock()
+
+		wg.Done()
+	})
+	wg.Wait()
+	return servers, nil
+}