path: root/websocket/client.go

package websocket

import (
    "fmt"
    "io"

    ws "code.google.com/p/go.net/websocket"
)

const channelBufSize = 100

var maxId int = 0

type MsgFunc func(c *Client, msg *Message)

// Chat client.
type Client struct {
    id     int
    ws     *ws.Conn
    server *Server
    ch     chan *Message
    doneCh chan bool

    onMessage MsgFunc
}

// Create new chat client.
func NewClient(ws *ws.Conn, server *Server) *Client {

    if ws == nil {
        panic("ws cannot be nil")
    }

    if server == nil {
        panic("server cannot be nil")
    }

    maxId++
    ch := make(chan *Message, channelBufSize)
    doneCh := make(chan bool)

    return &Client{maxId, ws, server, ch, doneCh, nil}
}

func (c *Client) Id() int {
    return c.id
}

func (c *Client) Conn() *ws.Conn {
    return c.ws
}

func (c *Client) Write(data interface{}, seed int) {
    msg := &Message{Seed: seed, Data: data}
    select {
    case c.ch <- msg:
    default:
        c.server.Del(c)
        err := fmt.Errorf("client %d is disconnected.", c.id)
        c.server.Err(err)
    }
}

func (c *Client) Done() {
    c.doneCh <- true
}

// Listen Write and Read request via chanel
func (c *Client) Listen() {
    go c.listenWrite()
    c.listenRead()
}

// Listen write request via chanel
func (c *Client) listenWrite() {
    logger.Debugln("Listening write to client")
    for {
        select {

        // send message to the client
        case msg := <-c.ch:
            logger.Debugln("Send:", msg)
            ws.JSON.Send(c.ws, msg)

        // receive done request
        case <-c.doneCh:
            c.server.Del(c)
            c.doneCh <- true // for listenRead method
            return
        }
    }
}

// Listen read request via chanel
func (c *Client) listenRead() {
    logger.Debugln("Listening read from client")
    for {
        select {

        // receive done request
        case <-c.doneCh:
            c.server.Del(c)
            c.doneCh <- true // for listenWrite method
            return

        // read data from ws connection
        default:
            var msg Message
            err := ws.JSON.Receive(c.ws, &msg)
            if err == io.EOF {
                c.doneCh <- true
            } else if err != nil {
                c.server.Err(err)
            } else {
                logger.Debugln(&msg)
                if c.onMessage != nil {
                    c.onMessage(c, &msg)
                }
            }
        }
    }
}