disconnected loop while waiting for redial only after first retry

[franck34]

Code (from example, but use ws rather than wss)

The server is a raw ws nodejs app, working perfectly with a golang client using gorilla websocket.

package main

import (
	"context"
	"log"
	"time"

	"github.com/recws-org/recws"
)

func main() {
	ctx, cancel := context.WithCancel(context.Background())
	ws := recws.RecConn{
		KeepAliveTimeout: 10 * time.Second,
	}
	ws.Dial("ws://192.168.56.101", nil)

	go func() {
		time.Sleep(2 * time.Second)
		cancel()
	}()

	for {
		select {
		case <-ctx.Done():
			go ws.Close()
			log.Printf("Websocket closed %s", ws.GetURL())
			return
		default:
			if !ws.IsConnected() {
				log.Printf("Websocket disconnected %s", ws.GetURL())
				continue
			}

			if err := ws.WriteMessage(1, []byte("Incoming")); err != nil {
				log.Printf("Error: WriteMessage %s", ws.GetURL())
				return
			}

			_, message, err := ws.ReadMessage()
			if err != nil {
				log.Printf("Error: ReadMessage %s", ws.GetURL())
				return
			}

			log.Printf("Success: %s", message)
		}
	}
}

14:25:30 => 14:25:32 = OK, waiting
14:25:32 => 14:25:34 = disconnected loop ?
14:25:34 = closing

2021/03/17 14:25:30 websocket: bad handshake
2021/03/17 14:25:30 Dial: will try again in 2s seconds.
2021/03/17 14:25:32 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:32 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:32 Websocket disconnected ws://192.168.56.101
.....
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket disconnected ws://192.168.56.101
2021/03/17 14:25:34 Websocket closed ws://192.168.56.101

[franck34]

Note: my ws server was running on port X, but my recws client was pointing to port Y

[Nikolay Pavlovich]

_, message, err := ws.ReadMessage()   
if err != nil {
log.Printf("Error: ReadMessage %s", ws.GetURL())  
    return  
}

must be like this

_, message, err := ws.ReadMessage()  
if err != nil {  
	if !errors.Is(err, recws.ErrNotConnected) {  
		log.Printf("Error: ReadMessage %s", ws.GetURL())  
		time.Sleep(time.Second * 5) // for throttle if error repeats  
	} else {  
		time.Sleep(time.Millisecond * 100) // for release cpu while wait reconnect  
	}  
	continue // go to next read  
}

[Lucas Löffel]

@nikepan please keep in mind that sleeping for a certain amount of time will never be a reliable solution

[Nikolay Pavlovich]

This sleep not for pause. Only for release cpu and throttle messages. But I will try make it without sleep. Thanks