144 lines
3.0 KiB
Go
144 lines
3.0 KiB
Go
package main
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import (
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"log"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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)
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const TIMEOUT = 6
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const IDLE_TIMEOUT = TIMEOUT * time.Second
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const PING_INTERVAL = (TIMEOUT / 2) * time.Second
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type WSConnection struct {
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alive bool
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url string
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conn *websocket.Conn
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errChan chan error
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writeLock sync.Mutex
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ReadChan chan string
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WriteChan chan string
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Dead chan error
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}
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func (ws *WSConnection) messageReader() {
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log.Printf("Starting reader")
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for {
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if !ws.alive {
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break
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}
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_, message, err := ws.conn.ReadMessage()
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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if err != nil {
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ws.errChan <- err
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break
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}
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log.Printf("Received: %s, %d in output channel", message, len(ws.ReadChan))
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ws.ReadChan <- string(message)
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}
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log.Printf("Reader done")
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}
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func (ws *WSConnection) messageSender() {
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log.Printf("Starting sender")
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for {
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msg, ok := <-ws.WriteChan
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if !ok {
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break
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}
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ws.doSend(msg)
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}
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log.Printf("Sender done")
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}
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func (ws *WSConnection) doSend(msg string) {
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ws.writeLock.Lock()
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defer ws.writeLock.Unlock()
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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log.Printf("Sending: %s, %d in input channel", msg, len(ws.WriteChan))
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err := ws.conn.WriteMessage(websocket.TextMessage, []byte(msg))
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if err != nil {
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log.Printf("Error during message writing: %v", err)
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ws.errChan <- err
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return
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}
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}
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func (ws *WSConnection) pinger() {
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log.Printf("Starting pinger, sleeping for %v", PING_INTERVAL)
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for {
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if !ws.alive {
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break
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}
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ws.doPing()
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time.Sleep(PING_INTERVAL)
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}
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log.Printf("Pinger done")
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}
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func (ws *WSConnection) doPing() {
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ws.writeLock.Lock()
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defer ws.writeLock.Unlock()
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// log.Printf("Ping")
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err := ws.conn.WriteMessage(websocket.PingMessage, nil)
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if err != nil {
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log.Println("Error during ping:", err)
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ws.errChan <- err
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return
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}
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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// log.Printf("Ping OK")
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}
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func (ws *WSConnection) handleError() {
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for {
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err := <-ws.errChan
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log.Printf("Client error: %+v", err)
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ws.alive = false
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ws.conn.Close()
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close(ws.ReadChan)
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close(ws.WriteChan)
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close(ws.errChan)
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ws.Dead <- err
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return
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}
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}
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func (ws *WSConnection) Open() {
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log.Printf("Connecting to %s", ws.url)
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ws.Dead = make(chan error, 1)
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conn, _, err := websocket.DefaultDialer.Dial(ws.url, nil)
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if err != nil {
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log.Println("Error during connection:", err)
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ws.Dead <- err
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return
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}
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log.Printf("Connected")
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ws.conn = conn
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ws.alive = true
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ws.errChan = make(chan error, 1)
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ws.ReadChan = make(chan string, 128)
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ws.WriteChan = make(chan string, 128)
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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ws.conn.SetPongHandler(func(string) error {
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// log.Println("Pong")
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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return nil
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})
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go ws.handleError()
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go ws.messageReader()
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go ws.messageSender()
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go ws.pinger()
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}
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