139 lines
3.0 KiB
Go
139 lines
3.0 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package websocket
|
|
|
|
import (
|
|
"bufio"
|
|
"crypto/tls"
|
|
"io"
|
|
"net"
|
|
"os"
|
|
"url"
|
|
)
|
|
|
|
// DialError is an error that occurs while dialling a websocket server.
|
|
type DialError struct {
|
|
*Config
|
|
Error os.Error
|
|
}
|
|
|
|
func (e *DialError) String() string {
|
|
return "websocket.Dial " + e.Config.Location.String() + ": " + e.Error.String()
|
|
}
|
|
|
|
// NewConfig creates a new WebSocket config for client connection.
|
|
func NewConfig(server, origin string) (config *Config, err os.Error) {
|
|
config = new(Config)
|
|
config.Version = ProtocolVersionHybi13
|
|
config.Location, err = url.ParseRequest(server)
|
|
if err != nil {
|
|
return
|
|
}
|
|
config.Origin, err = url.ParseRequest(origin)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
// NewClient creates a new WebSocket client connection over rwc.
|
|
func NewClient(config *Config, rwc io.ReadWriteCloser) (ws *Conn, err os.Error) {
|
|
br := bufio.NewReader(rwc)
|
|
bw := bufio.NewWriter(rwc)
|
|
switch config.Version {
|
|
case ProtocolVersionHixie75:
|
|
err = hixie75ClientHandshake(config, br, bw)
|
|
case ProtocolVersionHixie76, ProtocolVersionHybi00:
|
|
err = hixie76ClientHandshake(config, br, bw)
|
|
case ProtocolVersionHybi08, ProtocolVersionHybi13:
|
|
err = hybiClientHandshake(config, br, bw)
|
|
default:
|
|
err = ErrBadProtocolVersion
|
|
}
|
|
if err != nil {
|
|
return
|
|
}
|
|
buf := bufio.NewReadWriter(br, bw)
|
|
switch config.Version {
|
|
case ProtocolVersionHixie75, ProtocolVersionHixie76, ProtocolVersionHybi00:
|
|
ws = newHixieClientConn(config, buf, rwc)
|
|
case ProtocolVersionHybi08, ProtocolVersionHybi13:
|
|
ws = newHybiClientConn(config, buf, rwc)
|
|
}
|
|
return
|
|
}
|
|
|
|
/*
|
|
Dial opens a new client connection to a WebSocket.
|
|
|
|
A trivial example client:
|
|
|
|
package main
|
|
|
|
import (
|
|
"http"
|
|
"log"
|
|
"strings"
|
|
"websocket"
|
|
)
|
|
|
|
func main() {
|
|
origin := "http://localhost/"
|
|
url := "ws://localhost/ws"
|
|
ws, err := websocket.Dial(url, "", origin)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if _, err := ws.Write([]byte("hello, world!\n")); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
var msg = make([]byte, 512);
|
|
if n, err := ws.Read(msg); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
// use msg[0:n]
|
|
}
|
|
*/
|
|
func Dial(url_, protocol, origin string) (ws *Conn, err os.Error) {
|
|
config, err := NewConfig(url_, origin)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return DialConfig(config)
|
|
}
|
|
|
|
// DialConfig opens a new client connection to a WebSocket with a config.
|
|
func DialConfig(config *Config) (ws *Conn, err os.Error) {
|
|
var client net.Conn
|
|
if config.Location == nil {
|
|
return nil, &DialError{config, ErrBadWebSocketLocation}
|
|
}
|
|
if config.Origin == nil {
|
|
return nil, &DialError{config, ErrBadWebSocketOrigin}
|
|
}
|
|
switch config.Location.Scheme {
|
|
case "ws":
|
|
client, err = net.Dial("tcp", config.Location.Host)
|
|
|
|
case "wss":
|
|
client, err = tls.Dial("tcp", config.Location.Host, config.TlsConfig)
|
|
|
|
default:
|
|
err = ErrBadScheme
|
|
}
|
|
if err != nil {
|
|
goto Error
|
|
}
|
|
|
|
ws, err = NewClient(config, client)
|
|
if err != nil {
|
|
goto Error
|
|
}
|
|
return
|
|
|
|
Error:
|
|
return nil, &DialError{config, err}
|
|
}
|