mirror of https://github.com/gorilla/websocket.git
104 lines
3.9 KiB
Go
104 lines
3.9 KiB
Go
// Copyright 2013 Gary Burd. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package websocket implements the WebSocket protocol defined in RFC 6455.
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//
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// Overview
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//
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// The Conn type represents a WebSocket connection. A server application calls
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// the Upgrade function from an HTTP request handler to get a pointer to a
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// Conn:
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//
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// func handler(w http.ResponseWriter, r *http.Request) {
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// ws, err := websocket.Upgrade(w, r, nil, 1024, 1024)
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// if _, ok := err.(websocket.HandshakeError); ok {
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// http.Error(w, "Not a websocket handshake", 400)
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// return
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// } else if err != nil {
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// log.Println(err)
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// return
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// }
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// ... Use conn to send and receive messages.
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// }
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//
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// Call the connection WriteMessage and ReadMessages methods to send and
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// receive messages as a slice of bytes. This snippet of code shows how to echo
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// messages using these methods:
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//
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// for {
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// messageType, p, err := conn.ReadMessage()
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// if err != nil {
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// return
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// }
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// if err := conn.WriteMessage(messageType, p); err != nil {
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// return err
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// }
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// }
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//
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// In above snippet of code, p is a []byte and messageType is an int with value
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// websocket.BinaryMessage or websocket.TextMessage.
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//
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// An application can also send and receive messages using the io.WriteCloser
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// and io.Reader interfaces. To send a message, call the connection NextWriter
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// method to get an io.WriteCloser, write the message to the writer and close
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// the writer when done. To receive a message, call the connection NextReader
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// method to get an io.Reader and read until io.EOF is returned. This snippet
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// snippet shows how to echo messages using the NextWriter and NextReader
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// methods:
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//
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// for {
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// messageType, r, err := conn.NextReader()
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// if err != nil {
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// return
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// }
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// w, err := conn.NextWriter(messageType)
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// if err != nil {
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// return err
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// }
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// if _, err := io.Copy(w, r); err != nil {
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// return err
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// }
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// if err := w.Close(); err != nil {
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// return err
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// }
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// }
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//
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// Data Messages
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//
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// The WebSocket protocol distinguishes between text and binary data messages.
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// Text messages are interpreted as UTF-8 encoded text. The interpretation of
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// binary messages is left to the application.
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//
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// This package uses the TextMessage and BinaryMessage integer constants to
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// identify the two data message types. The ReadMessage and NextReader methods
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// return the type of the received message. The messageType argument to the
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// WriteMessage and NextWriter methods specifies the type of a sent message.
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//
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// It is the application's responsibility to ensure that text messages are
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// valid UTF-8 encoded text.
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//
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// Control Messages
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//
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// The WebSocket protocol defines three types of control messages: close, ping
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// and pong. Call the connection WriteControl, WriteMessage or NextWriter
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// methods to send a control message to the peer.
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//
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// Connections handle received ping and pong messages by invoking a callback
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// function set with SetPingHandler and SetPongHandler methods. These callback
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// functions can be invoked from the ReadMessage method, the NextReader method
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// or from a call to the data message reader returned from NextReader.
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//
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// Connections handle received close messages by returning an error from the
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// ReadMessage method, the NextReader method or from a call to the data message
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// reader returned from NextReader.
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//
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// Concurrency
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//
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// A Conn supports a single concurrent caller to the write methods (NextWriter,
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// SetWriteDeadline, WriteMessage) and a single concurrent caller to the read
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// methods (NextReader, SetReadDeadline, ReadMessage). The Close and
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// WriteControl methods can be called concurrently with all other methods.
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//
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package websocket
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