Support keepalive http agent.
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README.md

agentkeepalive

NPM version build status Appveyor status Test coverage David deps Known Vulnerabilities npm download

The enhancement features 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.
  • TTL for active socket.

Node.js version required

Support Node.js >= 8.0.0

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.
    • freeSocketTimeout: {Number} Sets the free socket to timeout after freeSocketTimeout 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 freeSocketTimeout * 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, // active socket keepalive for 60 seconds
  freeSocketTimeout: 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

MIT