agentkeepalive

What is agentkeepalive?

The agentkeepalive npm package is a module that provides an HTTP(S) Agent which keeps socket connections alive between keep-alive requests. It is designed to improve the performance of HTTP clients by reusing sockets for subsequent requests to the same servers, which can reduce the overhead of establishing new TCP connections.

What are agentkeepalive's main functionalities?

HTTP Keep-Alive Agent

This feature allows you to create an HTTP agent that reuses sockets for HTTP requests to improve performance.

const { HttpAgent } = require('agentkeepalive');
const keepaliveAgent = new HttpAgent();
const http = require('http');

http.request({
  host: 'localhost',
  port: 80,
  path: '/',
  agent: keepaliveAgent
});

HTTPS Keep-Alive Agent

This feature allows you to create an HTTPS agent that reuses sockets for HTTPS requests to improve performance.

const { HttpsAgent } = require('agentkeepalive').HttpsAgent;
const keepaliveAgent = new HttpsAgent();
const https = require('https');

https.request({
  host: 'localhost',
  port: 443,
  path: '/',
  agent: keepaliveAgent
});

Custom Agent Options

This feature allows you to customize the behavior of the keep-alive agent by setting options such as the maximum number of sockets, the maximum number of free sockets, socket timeout, and free socket timeout.

const { HttpAgent } = require('agentkeepalive');
const keepaliveAgent = new HttpAgent({
  maxSockets: 50,
  maxFreeSockets: 10,
  timeout: 60000,
  freeSocketTimeout: 30000
});

Other packages similar to agentkeepalive

forever-agent

forever-agent is similar to agentkeepalive in that it provides an HTTP(S) agent that keeps connections alive indefinitely. It is less configurable than agentkeepalive and does not provide the same level of control over socket reuse and timeouts.

README

agentkeepalive

The Node.js's missing keep alive http.Agent. Support http and https.

What's different from original http.Agent?

• keepAlive=true by default
• Disable Nagle's algorithm: socket.setNoDelay(true)
• Add free socket timeout: avoid long time inactivity socket leak in the free-sockets queue.
• Add active socket timeout: avoid long time inactivity socket leak in the active-sockets queue.

Install

$ npm install agentkeepalive --save

new Agent([options])

• options {Object} Set of configurable options to set on the agent. Can have the following fields:
  • keepAlive {Boolean} Keep sockets around in a pool to be used by other requests in the future. Default = true.
  • keepAliveMsecs {Number} When using the keepAlive option, specifies the initial delay for TCP Keep-Alive packets. Ignored when the keepAlive option is false or undefined. Defaults to 1000. Default = 1000. Only relevant if keepAlive is set to true.
  • freeSocketKeepAliveTimeout: {Number} Sets the free socket to timeout after freeSocketKeepAliveTimeout milliseconds of inactivity on the free socket. Default is 15000. Only relevant if keepAlive is set to true.
  • timeout: {Number} Sets the working socket to timeout after timeout milliseconds of inactivity on the working socket. Default is freeSocketKeepAliveTimeout * 2.
  • maxSockets {Number} Maximum number of sockets to allow per host. Default = Infinity.
  • maxFreeSockets {Number} Maximum number of sockets (per host) to leave open in a free state. Only relevant if keepAlive is set to true. Default = 256.
  • socketActiveTTL {Number} Sets the socket active time to live, even if it's in use. If not setted the behaviour continues the same (the socket will be released only when free) Default = null.

Usage

const http = require('http');
const Agent = require('agentkeepalive');

const keepaliveAgent = new Agent({
  maxSockets: 100,
  maxFreeSockets: 10,
  timeout: 60000,
  freeSocketKeepAliveTimeout: 30000, // free socket keepalive for 30 seconds
});

const options = {
  host: 'cnodejs.org',
  port: 80,
  path: '/',
  method: 'GET',
  agent: keepaliveAgent,
};

const req = http.request(options, res => {
  console.log('STATUS: ' + res.statusCode);
  console.log('HEADERS: ' + JSON.stringify(res.headers));
  res.setEncoding('utf8');
  res.on('data', function (chunk) {
    console.log('BODY: ' + chunk);
  });
});
req.on('error', e => {
  console.log('problem with request: ' + e.message);
});
req.end();

setTimeout(() => {
  if (keepaliveAgent.statusChanged) {
    console.log('[%s] agent status changed: %j', Date(), keepaliveAgent.getCurrentStatus());
  }
}, 2000);

getter agent.statusChanged

counters have change or not after last checkpoint.

agent.getCurrentStatus()

agent.getCurrentStatus() will return a object to show the status of this agent:

{
  createSocketCount: 10,
  closeSocketCount: 5,
  timeoutSocketCount: 0,
  requestCount: 5,
  freeSockets: { 'localhost:57479:': 3 },
  sockets: { 'localhost:57479:': 5 },
  requests: {}
}

Support https

const https = require('https');
const HttpsAgent = require('agentkeepalive').HttpsAgent;

const keepaliveAgent = new HttpsAgent();
// https://www.google.com/search?q=nodejs&sugexp=chrome,mod=12&sourceid=chrome&ie=UTF-8
const options = {
  host: 'www.google.com',
  port: 443,
  path: '/search?q=nodejs&sugexp=chrome,mod=12&sourceid=chrome&ie=UTF-8',
  method: 'GET',
  agent: keepaliveAgent,
};

const req = https.request(options, res => {
  console.log('STATUS: ' + res.statusCode);
  console.log('HEADERS: ' + JSON.stringify(res.headers));
  res.setEncoding('utf8');
  res.on('data', chunk => {
    console.log('BODY: ' + chunk);
  });
});

req.on('error', e => {
  console.log('problem with request: ' + e.message);
});
req.end();

setTimeout(() => {
  console.log('agent status: %j', keepaliveAgent.getCurrentStatus());
}, 2000);

Benchmark

run the benchmark:

cd benchmark
sh start.sh

Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz

node@v0.8.9

50 maxSockets, 60 concurrent, 1000 requests per concurrent, 5ms delay

Keep alive agent (30 seconds):

Transactions:          60000 hits
Availability:         100.00 %
Elapsed time:          29.70 secs
Data transferred:        14.88 MB
Response time:            0.03 secs
Transaction rate:      2020.20 trans/sec
Throughput:           0.50 MB/sec
Concurrency:           59.84
Successful transactions:       60000
Failed transactions:             0
Longest transaction:          0.15
Shortest transaction:         0.01

Normal agent:

Transactions:          60000 hits
Availability:         100.00 %
Elapsed time:          46.53 secs
Data transferred:        14.88 MB
Response time:            0.05 secs
Transaction rate:      1289.49 trans/sec
Throughput:           0.32 MB/sec
Concurrency:           59.81
Successful transactions:       60000
Failed transactions:             0
Longest transaction:          0.45
Shortest transaction:         0.00

Socket created:

[proxy.js:120000] keepalive, 50 created, 60000 requestFinished, 1200 req/socket, 0 requests, 0 sockets, 0 unusedSockets, 50 timeout
{" <10ms":662," <15ms":17825," <20ms":20552," <30ms":17646," <40ms":2315," <50ms":567," <100ms":377," <150ms":56," <200ms":0," >=200ms+":0}
----------------------------------------------------------------
[proxy.js:120000] normal   , 53866 created, 84260 requestFinished, 1.56 req/socket, 0 requests, 0 sockets
{" <10ms":75," <15ms":1112," <20ms":10947," <30ms":32130," <40ms":8228," <50ms":3002," <100ms":4274," <150ms":181," <200ms":18," >=200ms+":33}

License

(The MIT License)

Copyright(c) node-modules and other contributors.
Copyright(c) 2012 - 2015 fengmk2 <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.