113 lines
2.0 KiB
Go
113 lines
2.0 KiB
Go
package main
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import (
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"fmt"
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"io"
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"log"
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"golang.org/x/net/websocket"
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)
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const channelBufSize = 100
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// Chat client.
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type Client struct {
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id string
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ws *websocket.Conn
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server *Server
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ch chan *ChatMessage
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pingch chan *PingMessage
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doneCh chan bool
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}
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// Create new chat client.
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func NewClient(ws *websocket.Conn, server *Server) *Client {
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if ws == nil {
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panic("ws cannot be nil")
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}
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if server == nil {
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panic("server cannot be nil")
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}
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ch := make(chan *ChatMessage, channelBufSize)
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doneCh := make(chan bool)
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pingch := make(chan *PingMessage)
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clientID := getClientIDFromRequest(ws.Request())
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return &Client{clientID, ws, server, ch, pingch, doneCh}
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}
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func (c *Client) Conn() *websocket.Conn {
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return c.ws
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}
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func (c *Client) Write(msg *ChatMessage) {
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select {
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case c.ch <- msg:
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default:
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c.server.Del(c)
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err := fmt.Errorf("client %d is disconnected.", c.id)
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c.server.Err(err)
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}
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}
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func (c *Client) Done() {
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c.doneCh <- true
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}
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// Listen Write and Read request via chanel
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func (c *Client) Listen() {
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go c.listenWrite()
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c.listenRead()
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}
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// Listen write request via chanel
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func (c *Client) listenWrite() {
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for {
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select {
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// Send a PING keepalive
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case msg := <-c.pingch:
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websocket.JSON.Send(c.ws, msg)
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// send message to the client
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case msg := <-c.ch:
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msg.MessageType = "CHAT"
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log.Println("Send:", msg)
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websocket.JSON.Send(c.ws, msg)
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// receive done request
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case <-c.doneCh:
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c.server.Del(c)
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c.doneCh <- true // for listenRead method
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return
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}
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}
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}
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// Listen read request via chanel
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func (c *Client) listenRead() {
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for {
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select {
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// receive done request
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case <-c.doneCh:
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c.server.Del(c)
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c.doneCh <- true // for listenWrite method
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return
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// read data from websocket connection
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default:
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var msg ChatMessage
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err := websocket.JSON.Receive(c.ws, &msg)
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if err == io.EOF {
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c.doneCh <- true
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} else if err != nil {
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c.server.Err(err)
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} else {
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c.server.SendAll(&msg)
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}
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}
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}
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}
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