don't allow send on closed channels

irc/channel.go

@@ -53,14 +53,26 @@ func (channel *Channel) Destroy() {
 	}
 
 	close(channel.replies)
+	channel.replies = nil
 	close(channel.commands)
+	channel.commands = nil
 
 	channel.server.channels.Remove(channel)
 
 	channel.destroyed = true
 }
 
+func (channel *Channel) Command(command ChannelCommand) {
+	if channel.commands == nil {
+		return
+	}
+	channel.commands <- command
+}
+
 func (channel *Channel) Reply(replies ...Reply) {
+	if channel.replies == nil {
+		return
+	}
 	for _, reply := range replies {
 		channel.replies <- reply
 	}

irc/client.go

@@ -161,6 +161,7 @@ func (client *Client) Destroy() {
 	client.conn.Close()
 
 	close(client.replies)
+	client.replies = nil
 
 	if client.idleTimer != nil {
 		client.idleTimer.Stop()
@@ -177,6 +178,9 @@ func (client *Client) Destroy() {
 }
 
 func (client *Client) Reply(replies ...Reply) {
+	if client.replies == nil {
+		return
+	}
 	for _, reply := range replies {
 		client.replies <- reply
 	}

irc/server.go

@@ -292,7 +292,7 @@ func (m *JoinCommand) HandleServer(s *Server) {
 		cmd := &PartCommand{}
 		cmd.SetClient(c)
 		for channel := range c.channels {
-			channel.commands <- cmd
+			channel.Command(cmd)
 		}
 		return
 	}