| 'use strict'; |
| |
| var inherits = require('inherits') |
| , EventEmitter = require('events').EventEmitter |
| ; |
| |
| var debug = function() {}; |
| if (process.env.NODE_ENV !== 'production') { |
| debug = require('debug')('sockjs-client:buffered-sender'); |
| } |
| |
| function BufferedSender(url, sender) { |
| debug(url); |
| EventEmitter.call(this); |
| this.sendBuffer = []; |
| this.sender = sender; |
| this.url = url; |
| } |
| |
| inherits(BufferedSender, EventEmitter); |
| |
| BufferedSender.prototype.send = function(message) { |
| debug('send', message); |
| this.sendBuffer.push(message); |
| if (!this.sendStop) { |
| this.sendSchedule(); |
| } |
| }; |
| |
| // For polling transports in a situation when in the message callback, |
| // new message is being send. If the sending connection was started |
| // before receiving one, it is possible to saturate the network and |
| // timeout due to the lack of receiving socket. To avoid that we delay |
| // sending messages by some small time, in order to let receiving |
| // connection be started beforehand. This is only a halfmeasure and |
| // does not fix the big problem, but it does make the tests go more |
| // stable on slow networks. |
| BufferedSender.prototype.sendScheduleWait = function() { |
| debug('sendScheduleWait'); |
| var self = this; |
| var tref; |
| this.sendStop = function() { |
| debug('sendStop'); |
| self.sendStop = null; |
| clearTimeout(tref); |
| }; |
| tref = setTimeout(function() { |
| debug('timeout'); |
| self.sendStop = null; |
| self.sendSchedule(); |
| }, 25); |
| }; |
| |
| BufferedSender.prototype.sendSchedule = function() { |
| debug('sendSchedule', this.sendBuffer.length); |
| var self = this; |
| if (this.sendBuffer.length > 0) { |
| var payload = '[' + this.sendBuffer.join(',') + ']'; |
| this.sendStop = this.sender(this.url, payload, function(err) { |
| self.sendStop = null; |
| if (err) { |
| debug('error', err); |
| self.emit('close', err.code || 1006, 'Sending error: ' + err); |
| self.close(); |
| } else { |
| self.sendScheduleWait(); |
| } |
| }); |
| this.sendBuffer = []; |
| } |
| }; |
| |
| BufferedSender.prototype._cleanup = function() { |
| debug('_cleanup'); |
| this.removeAllListeners(); |
| }; |
| |
| BufferedSender.prototype.close = function() { |
| debug('close'); |
| this._cleanup(); |
| if (this.sendStop) { |
| this.sendStop(); |
| this.sendStop = null; |
| } |
| }; |
| |
| module.exports = BufferedSender; |