/
wslisten.go
79 lines (69 loc) · 1.73 KB
/
wslisten.go
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// Copyright (c) 2018 The Grumble Authors
// The use of this source code is governed by a BSD-style
// license that can be found in the LICENSE-file.
package web
import (
"fmt"
"log"
"net"
"net/http"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
HandshakeTimeout: 20 * time.Second,
Subprotocols: []string{"mumble", "binary"},
CheckOrigin: func(r *http.Request) bool {
return true
},
}
type Listener struct {
sockets chan *conn
done chan struct{}
addr net.Addr
closed int32
logger *log.Logger
}
func NewListener(laddr net.Addr, logger *log.Logger) *Listener {
return &Listener{
sockets: make(chan *conn),
done: make(chan struct{}),
addr: laddr,
logger: logger,
}
}
func (l *Listener) Accept() (net.Conn, error) {
if atomic.LoadInt32(&l.closed) != 0 {
return nil, fmt.Errorf("accept ws %v: use of closed websocket listener", l.addr)
}
select {
case ws := <-l.sockets:
return ws, nil
case <-l.done:
return nil, fmt.Errorf("accept ws %v: use of closed websocket listener", l.addr)
}
}
func (l *Listener) Close() error {
if !atomic.CompareAndSwapInt32(&l.closed, 0, 1) {
return fmt.Errorf("close ws %v: use of closed websocket listener", l.addr)
}
close(l.done)
return nil
}
func (l *Listener) Addr() net.Addr {
return l.addr
}
func (l *Listener) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if atomic.LoadInt32(&l.closed) != 0 {
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
l.logger.Printf("Upgrading web connection from: %v", r.RemoteAddr)
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
l.logger.Printf("Failed upgrade: %v", err)
return
}
l.sockets <- &conn{ws: ws}
}