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/**
* refer:
* * @atimb "Real keep-alive HTTP agent": https://gist.github.com/2963672
* * https://github.com/joyent/node/blob/master/lib/http.js
* * https://github.com/joyent/node/blob/master/lib/https.js
* * https://github.com/joyent/node/blob/master/lib/_http_agent.js
*
* Copyright(c) 2012 - 2014 fengmk2 <fengmk2@gmail.com>
* Copyright(c) node-modules
* MIT Licensed
*/
'use strict';
/**
* Module dependencies.
*/
var https = require('https');
var utils = require('./utils');
var OriginalAgent = require('./_http_agent').Agent;
var OriginalHttpsAgent = https.Agent;
module.exports = Agent;
function Agent(options) {
if (!(this instanceof Agent)) {
return new Agent(options);
}
options = options || {};
options.keepAlive = options.keepAlive !== false;
// default is keep-alive and 15s free socket timeout
if (options.keepAliveTimeout === undefined) {
options.keepAliveTimeout = 15000;
}
// default timeout is double keepalive timeout
if (options.timeout === undefined) {
options.timeout = options.keepAliveTimeout * 2;
}
OriginalAgent.call(this, options);
var self = this;
self.createSocketCount = 0;
self.closeSocketCount = 0;
// socket error event count
self.errorSocketCount = 0;
self.requestCount = 0;
self.timeoutSocketCount = 0;
self.on('free', function () {
self.requestCount++;
});
self.on('timeout', function () {
self.timeoutSocketCount++;
});
self.on('close', function () {
self.closeSocketCount++;
});
self.on('error', function () {
self.errorSocketCount++;
});
}
utils.inherits(Agent, OriginalAgent);
Agent.prototype.createSocket = function (req, options) {
var socket = OriginalAgent.prototype.createSocket.call(this, req, options);
if (this.keepAlive) {
// Disable Nagle's algorithm: http://blog.caustik.com/2012/04/08/scaling-node-js-to-100k-concurrent-connections/
// http://fengmk2.com/benchmark/nagle-algorithm-delayed-ack-mock.html
socket.setNoDelay(true);
}
this.createSocketCount++;
return socket;
};
Agent.prototype.getCurrentStatus = function () {
return {
createSocketCount: this.createSocketCount,
closeSocketCount: this.closeSocketCount,
errorSocketCount: this.errorSocketCount,
timeoutSocketCount: this.timeoutSocketCount,
requestCount: this.requestCount,
freeSockets: inspect(this.freeSockets),
sockets: inspect(this.sockets),
requests: inspect(this.requests)
};
};
function inspect(obj) {
var res = {};
for (var key in obj) {
res[key] = obj[key].length;
}
return res;
}
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