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bandwith.js
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bandwith.js
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/*
* 2011 Peter 'Pita' Martischka
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var async = require("async");
var config;
exports.configure = function (_config)
{
config = _config;
}
exports.pipe = function (inCon, outCon)
{
var queue = async.queue(function (task, callback) {
//calculate the delay of this package by its size
var packetSizeInBit = task.packet.length * 8;
var bitsPerSecond = config.bandwith*1000;
var delayInSeconds = packetSizeInBit/bitsPerSecond;
var delayInMilliSeconds = Math.round(delayInSeconds*1000);
setTimeout(function(){
task.callback(task.packet);
callback();
}, delayInMilliSeconds);
}, 1);
this.onData = function (packet, callback)
{
queue.push({packet:packet, callback: callback});
}
}