简单的golang IRC bot可以防止超时

Question

我正在修补golang,我的第一个代码是一个简单的IRC机器人,代码如下:

package main

import ("net"
        "log"
        "bufio"
        "fmt"
        "net/textproto"
      )
type Bot struct{
        server string
        port string
        nick string
        user string
        channel string
        pass string
        pread, pwrite chan string
        conn net.Conn
}

func NewBot() *Bot {
        return &Bot{server: "irc.freenode.net",
                    port: "6667",
                    nick: "subsaharan",
                    channel: "#rapidsms", 
                    pass: "",
                    conn: nil,
                    user: "blaze"}
}
func (bot *Bot) Connect() (conn net.Conn, err error){
  conn, err = net.Dial("tcp",bot.server + ":" + bot.port)
  if err != nil{
    log.Fatal("unable to connect to IRC server ", err)
  }
  bot.conn = conn
  log.Printf("Connected to IRC server %s (%s)\n", bot.server, bot.conn.RemoteAddr())
  return bot.conn, nil
}



func main(){
  ircbot := NewBot()
  conn, _ := ircbot.Connect()
  conn.Write([]byte("NICK " + ircbot.nick))
  conn.Write([]byte("JOIN " + ircbot.channel))
  defer conn.Close()

  reader := bufio.NewReader(conn)
  tp := textproto.NewReader( reader )
  for {
        line, err := tp.ReadLine()
        if err != nil {
            break // break loop on errors    
        }
        fmt.Printf("%s\n", line)
    }

}

当我运行此代码时,我在终端上获得以下输出:

2012/11/12 13:31:20 Connected to IRC server irc.freenode.net (193.219.128.49:6667)
:sendak.freenode.net NOTICE * :*** Looking up your hostname...
:sendak.freenode.net NOTICE * :*** Checking Ident
:sendak.freenode.net NOTICE * :*** Couldn't look up your hostname
:sendak.freenode.net NOTICE * :*** No Ident response
ERROR :Closing Link: 127.0.0.1 (Connection timed out)

连接保持超时的任何原因？

Answer 1

发送到IRC服务器的所有命令最多为255 512个字节,必须以回车符和换行符终止\r\n.

conn.Write([]byte("NICK " + ircbot.nick + "\r\n"))
conn.Write([]byte("JOIN " + ircbot.channel + "\r\n"))

此外,freenode希望USER命令是它看到的第一件事.

conn.Write([]byte("USER "+ircbot.nick+" 8 * :" + ircbot.nick + "\r\n"))
conn.Write([]byte("NICK " + ircbot.nick + "\r\n"))
conn.Write([]byte("JOIN " + ircbot.channel + "\r\n"))

作为旁注,您可以使用fmt.Fprintf格式化和发送数据,让您的生活更轻松:

fmt.Fprintf(conn, "USER %s 8 * :%s\r\n", ircbot.nick, ircbot.nick)
fmt.Fprintf(conn, "NICK %s\r\n", ircbot.nick)
fmt.Fprintf(conn, "JOIN %s\r\n", ircbot.channel)

第一个参数fmt.Fprintf必须是满足io.Writer接口的任何类型.在net.Conn实现全部做到这一点.因此,您可以将它们传递给任何期望io.Writer(或io.Reader就此而言)实现的功能.