使用Go实现一个百行聊天服务器

前段时间, redis作者不是整了个c语言版本的聊天服务器嘛, 地址, 代码量拢共不过百行.

于是, 心血来潮下, 我也整了个Go语言版本. 简单来说就是实现了一个聊天室的功能. 将所有注释空行都去掉, 刚好100行实现. 废话不多说, 先上代码:

package mainimport ("fmt""log""net""strings""sync"
)type Server struct { // 服务端内容clients map[string]*Clientlock    sync.Mutex
}func (s *Server) delClient(client *Client) { // 客户端关闭s.lock.Lock()defer s.lock.Unlock()delete(s.clients, client.name)
}func (s *Server) addClient(client *Client) { // 客户端关闭s.lock.Lock()defer s.lock.Unlock()s.clients[client.name] = client
}func (s *Server) sendMsgToOtherClient(msg string, client *Client) { // 将消息发送给其他所有客户端s.lock.Lock()defer s.lock.Unlock()// 将消息转发给其他客户端for _, c := range s.clients {if c != client {c.msgCh <- "msg-> " + client.name + ": " + msg + "\n"}}
}type Client struct { // 定义客户端conn   net.Connname   string      // 当前客户端的名称msgCh  chan string // 发送消息的管道server *Server
}func (c *Client) receive() { // 接收消息for msg := range c.msgCh {_, _ = c.conn.Write([]byte(msg))}
}func (c *Client) close() {c.server.delClient(c)close(c.msgCh)_ = c.conn.Close()
}func (c *Client) handle() { // 开始处理连接_, _ = c.conn.Write([]byte(fmt.Sprintf("hello %s!\n", c.name))) // 发送欢迎信息c.server.sendMsgToOtherClient("join", c)                        // 通知大家, 有人加入了聊天室defer c.close()for {buf := make([]byte, 2048)n, err := c.conn.Read(buf) // 接收客户端发送的消息if err != nil {log.Printf("receive client data error: %s", err.Error())return}msg := strings.TrimSpace(string(buf[:n]))if len(msg) == 0 {continue}if msg == "quit" {c.server.sendMsgToOtherClient("quit", c) // 通知大家, 有人退出了聊天室return}c.server.sendMsgToOtherClient(msg, c)}
}func main() {// 监听端口listener, err := net.Listen("tcp", ":8080")if err != nil {panic(err)}server := &Server{clients: make(map[string]*Client),lock:    sync.Mutex{},}nameIndex := 1for {conn, err := listener.Accept() // 建立连接if err != nil {log.Println(err)continue}client := &Client{conn:   conn,msgCh:  make(chan string, 100),name:   fmt.Sprintf("user%d", nameIndex),server: server,}nameIndex++server.addClient(client)go client.handle()go client.receive()log.Printf("new client: %s\n", conn.RemoteAddr())}
}