github.com/misfo/deis@v1.0.1-0.20141111224634-e0eee0392b8a/logspout/Godeps/_workspace/src/code.google.com/p/go.net/websocket/client.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package websocket
     6  
     7  import (
     8  	"bufio"
     9  	"crypto/tls"
    10  	"io"
    11  	"net"
    12  	"net/http"
    13  	"net/url"
    14  )
    15  
    16  // DialError is an error that occurs while dialling a websocket server.
    17  type DialError struct {
    18  	*Config
    19  	Err error
    20  }
    21  
    22  func (e *DialError) Error() string {
    23  	return "websocket.Dial " + e.Config.Location.String() + ": " + e.Err.Error()
    24  }
    25  
    26  // NewConfig creates a new WebSocket config for client connection.
    27  func NewConfig(server, origin string) (config *Config, err error) {
    28  	config = new(Config)
    29  	config.Version = ProtocolVersionHybi13
    30  	config.Location, err = url.ParseRequestURI(server)
    31  	if err != nil {
    32  		return
    33  	}
    34  	config.Origin, err = url.ParseRequestURI(origin)
    35  	if err != nil {
    36  		return
    37  	}
    38  	config.Header = http.Header(make(map[string][]string))
    39  	return
    40  }
    41  
    42  // NewClient creates a new WebSocket client connection over rwc.
    43  func NewClient(config *Config, rwc io.ReadWriteCloser) (ws *Conn, err error) {
    44  	br := bufio.NewReader(rwc)
    45  	bw := bufio.NewWriter(rwc)
    46  	err = hybiClientHandshake(config, br, bw)
    47  	if err != nil {
    48  		return
    49  	}
    50  	buf := bufio.NewReadWriter(br, bw)
    51  	ws = newHybiClientConn(config, buf, rwc)
    52  	return
    53  }
    54  
    55  // Dial opens a new client connection to a WebSocket.
    56  func Dial(url_, protocol, origin string) (ws *Conn, err error) {
    57  	config, err := NewConfig(url_, origin)
    58  	if err != nil {
    59  		return nil, err
    60  	}
    61  	if protocol != "" {
    62  		config.Protocol = []string{protocol}
    63  	}
    64  	return DialConfig(config)
    65  }
    66  
    67  // DialConfig opens a new client connection to a WebSocket with a config.
    68  func DialConfig(config *Config) (ws *Conn, err error) {
    69  	var client net.Conn
    70  	if config.Location == nil {
    71  		return nil, &DialError{config, ErrBadWebSocketLocation}
    72  	}
    73  	if config.Origin == nil {
    74  		return nil, &DialError{config, ErrBadWebSocketOrigin}
    75  	}
    76  	switch config.Location.Scheme {
    77  	case "ws":
    78  		client, err = net.Dial("tcp", config.Location.Host)
    79  
    80  	case "wss":
    81  		client, err = tls.Dial("tcp", config.Location.Host, config.TlsConfig)
    82  
    83  	default:
    84  		err = ErrBadScheme
    85  	}
    86  	if err != nil {
    87  		goto Error
    88  	}
    89  
    90  	ws, err = NewClient(config, client)
    91  	if err != nil {
    92  		goto Error
    93  	}
    94  	return
    95  
    96  Error:
    97  	return nil, &DialError{config, err}
    98  }