'use strict';
|
|
var Buffer = require('safe-buffer').Buffer,
|
Emitter = require('events').EventEmitter,
|
util = require('util'),
|
streams = require('../streams'),
|
Headers = require('./headers'),
|
Reader = require('./stream_reader');
|
|
var Base = function(request, url, options) {
|
Emitter.call(this);
|
Base.validateOptions(options || {}, ['maxLength', 'masking', 'requireMasking', 'protocols']);
|
|
this._request = request;
|
this._reader = new Reader();
|
this._options = options || {};
|
this._maxLength = this._options.maxLength || this.MAX_LENGTH;
|
this._headers = new Headers();
|
this.__queue = [];
|
this.readyState = 0;
|
this.url = url;
|
|
this.io = new streams.IO(this);
|
this.messages = new streams.Messages(this);
|
this._bindEventListeners();
|
};
|
util.inherits(Base, Emitter);
|
|
Base.isWebSocket = function(request) {
|
var connection = request.headers.connection || '',
|
upgrade = request.headers.upgrade || '';
|
|
return request.method === 'GET' &&
|
connection.toLowerCase().split(/ *, */).indexOf('upgrade') >= 0 &&
|
upgrade.toLowerCase() === 'websocket';
|
};
|
|
Base.validateOptions = function(options, validKeys) {
|
for (var key in options) {
|
if (validKeys.indexOf(key) < 0)
|
throw new Error('Unrecognized option: ' + key);
|
}
|
};
|
|
var instance = {
|
// This is 64MB, small enough for an average VPS to handle without
|
// crashing from process out of memory
|
MAX_LENGTH: 0x3ffffff,
|
|
STATES: ['connecting', 'open', 'closing', 'closed'],
|
|
_bindEventListeners: function() {
|
var self = this;
|
|
// Protocol errors are informational and do not have to be handled
|
this.messages.on('error', function() {});
|
|
this.on('message', function(event) {
|
var messages = self.messages;
|
if (messages.readable) messages.emit('data', event.data);
|
});
|
|
this.on('error', function(error) {
|
var messages = self.messages;
|
if (messages.readable) messages.emit('error', error);
|
});
|
|
this.on('close', function() {
|
var messages = self.messages;
|
if (!messages.readable) return;
|
messages.readable = messages.writable = false;
|
messages.emit('end');
|
});
|
},
|
|
getState: function() {
|
return this.STATES[this.readyState] || null;
|
},
|
|
addExtension: function(extension) {
|
return false;
|
},
|
|
setHeader: function(name, value) {
|
if (this.readyState > 0) return false;
|
this._headers.set(name, value);
|
return true;
|
},
|
|
start: function() {
|
if (this.readyState !== 0) return false;
|
|
if (!Base.isWebSocket(this._request))
|
return this._failHandshake(new Error('Not a WebSocket request'));
|
|
var response;
|
|
try {
|
response = this._handshakeResponse();
|
} catch (error) {
|
return this._failHandshake(error);
|
}
|
|
this._write(response);
|
if (this._stage !== -1) this._open();
|
return true;
|
},
|
|
_failHandshake: function(error) {
|
var headers = new Headers();
|
headers.set('Content-Type', 'text/plain');
|
headers.set('Content-Length', Buffer.byteLength(error.message, 'utf8'));
|
|
headers = ['HTTP/1.1 400 Bad Request', headers.toString(), error.message];
|
this._write(Buffer.from(headers.join('\r\n'), 'utf8'));
|
this._fail('protocol_error', error.message);
|
|
return false;
|
},
|
|
text: function(message) {
|
return this.frame(message);
|
},
|
|
binary: function(message) {
|
return false;
|
},
|
|
ping: function() {
|
return false;
|
},
|
|
pong: function() {
|
return false;
|
},
|
|
close: function(reason, code) {
|
if (this.readyState !== 1) return false;
|
this.readyState = 3;
|
this.emit('close', new Base.CloseEvent(null, null));
|
return true;
|
},
|
|
_open: function() {
|
this.readyState = 1;
|
this.__queue.forEach(function(args) { this.frame.apply(this, args) }, this);
|
this.__queue = [];
|
this.emit('open', new Base.OpenEvent());
|
},
|
|
_queue: function(message) {
|
this.__queue.push(message);
|
return true;
|
},
|
|
_write: function(chunk) {
|
var io = this.io;
|
if (io.readable) io.emit('data', chunk);
|
},
|
|
_fail: function(type, message) {
|
this.readyState = 2;
|
this.emit('error', new Error(message));
|
this.close();
|
}
|
};
|
|
for (var key in instance)
|
Base.prototype[key] = instance[key];
|
|
|
Base.ConnectEvent = function() {};
|
|
Base.OpenEvent = function() {};
|
|
Base.CloseEvent = function(code, reason) {
|
this.code = code;
|
this.reason = reason;
|
};
|
|
Base.MessageEvent = function(data) {
|
this.data = data;
|
};
|
|
Base.PingEvent = function(data) {
|
this.data = data;
|
};
|
|
Base.PongEvent = function(data) {
|
this.data = data;
|
};
|
|
module.exports = Base;
|
