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Pinging not working as expected #186

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@pmwebster

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@pmwebster

It's very possible I'm using this wrong, but pulling from your echo example, and your tests, a simple ping test with the following fails:

package main

import (
	"context"
	"fmt"
	"log"
	"net"
	"net/http"
	"time"

	"nhooyr.io/websocket"
	"nhooyr.io/websocket/wsjson"
)

func main() {
	l, err := net.Listen("tcp", "localhost:0")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	defer l.Close()

	s := &http.Server{
		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			err := pingServer(w, r)
			if err != nil {
				log.Printf("echo server: %v", err)
			}
		}),
		ReadTimeout:  time.Second * 15,
		WriteTimeout: time.Second * 15,
	}
	defer s.Close()

	go func() {
		err := s.Serve(l)
		if err != http.ErrServerClosed {
			log.Fatalf("failed to listen and serve: %v", err)
		}
	}()

	err = client("ws://" + l.Addr().String())
	if err != nil {
		log.Fatalf("client failed: %v", err)
	}
}

func pingServer(w http.ResponseWriter, r *http.Request) error {
	c, err := websocket.Accept(w, r, nil)
	if err != nil {
		return err
	}
	defer c.Close(websocket.StatusInternalError, "the sky is falling")

	log.Println("Pinging client")
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	defer cancel()

	err = c.Ping(ctx)
	if err != nil {
		return err
	}
	return nil
}

func client(url string) error {
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()

	c, _, err := websocket.Dial(ctx, url, nil)
	if err != nil {
		return err
	}
	defer c.Close(websocket.StatusInternalError, "the sky is falling")

	for {
		v := map[string]int{}
		err = wsjson.Read(ctx, c, &v)
		if err != nil {
			return err
		}

		fmt.Printf("received: %v\n", v)
	}

	c.Close(websocket.StatusNormalClosure, "")
	return nil
}

Output:

2020/02/10 22:09:42 Pinging client
2020/02/10 22:09:47 echo server: failed to ping: failed to wait for pong: context deadline exceeded
2020/02/10 22:09:47 client failed: failed to read json: failed to get reader: failed to read frame header: read tcp 127.0.0.1:51279->127.0.0.1:51278: read: connection reset by peer
exit status 1

Is there a different way this is supposed to be used? Thanks for any insight!

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