Introduce general send limit to prevent global-timeouts

Signed-off-by: Knut Ahlers <knut@ahlers.me>

irc.go

@@ -14,9 +14,6 @@ import (
 
 const (
 	twitchRequestTimeout = 2 * time.Second
-	// 20 join attempts per 10 seconds per user (2000 for verified bots)
-	// https://dev.twitch.tv/docs/irc/guide
-	twitchChannelJoinDelay = time.Second
 )
 
 const (
@@ -51,6 +48,9 @@ func newIRCHandler() (*ircHandler, error) {
 		User:    username,
 		Name:    username,
 		Handler: h,
+
+		SendLimit: cfg.IRCRateLimit,
+		SendBurst: 0, // Twitch uses a bucket system, we don't have anything to replicate that in this IRC client
 	})
 	h.conn = conn
 	h.user = username
@@ -63,9 +63,6 @@ func (i ircHandler) Close() error { return i.conn.Close() }
 func (i ircHandler) ExecuteJoins(channels []string) {
 	for _, ch := range channels {
 		i.c.Write(fmt.Sprintf("JOIN #%s", strings.TrimLeft(ch, "#")))
-
-		// We need to wait a moment between joins not to get kicked
-		time.Sleep(twitchChannelJoinDelay)
 	}
 }
 

main.go

@@ -20,6 +20,7 @@ var (
 	cfg = struct {
 		CommandTimeout time.Duration `flag:"command-timeout" default:"30s" description:"Timeout for command execution"`
 		Config         string        `flag:"config,c" default:"./config.yaml" description:"Location of configuration file"`
+		IRCRateLimit   time.Duration `flag:"rate-limit" default:"1500ms" description:"How often to send a message (default: 20/30s=1500ms, if your bot is mod everywhere: 100/30s=300ms, different for known/verified bots)"`
 		LogLevel       string        `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
 		StorageFile    string        `flag:"storage-file" default:"./storage.json.gz" description:"Where to store the data"`
 		TwitchClient   string        `flag:"twitch-client" default:"" description:"Client ID to act as"`