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Edit File : agent.js \| Size : 4.18 KB
/** * 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 / 'use strict'; const OriginalAgent = require('./_http_agent').Agent; const ms = require('humanize-ms'); class Agent extends OriginalAgent { constructor(options) { options = options \|\| {}; options.keepAlive = options.keepAlive !== false; // default is keep-alive and 15s free socket timeout if (options.freeSocketKeepAliveTimeout === undefined) { options.freeSocketKeepAliveTimeout = 15000; } // Legacy API: keepAliveTimeout should be rename to `freeSocketKeepAliveTimeout` if (options.keepAliveTimeout) { options.freeSocketKeepAliveTimeout = options.keepAliveTimeout; } options.freeSocketKeepAliveTimeout = ms(options.freeSocketKeepAliveTimeout); // Sets the socket to timeout after timeout milliseconds of inactivity on the socket. // By default is double free socket keepalive timeout. if (options.timeout === undefined) { options.timeout = options.freeSocketKeepAliveTimeout 2; // make sure socket default inactivity timeout >= 30s if (options.timeout < 30000) { options.timeout = 30000; } } options.timeout = ms(options.timeout); super(options); this.createSocketCount = 0; this.createSocketCountLastCheck = 0; this.createSocketErrorCount = 0; this.createSocketErrorCountLastCheck = 0; this.closeSocketCount = 0; this.closeSocketCountLastCheck = 0; // socket error event count this.errorSocketCount = 0; this.errorSocketCountLastCheck = 0; this.requestCount = 0; this.requestCountLastCheck = 0; this.timeoutSocketCount = 0; this.timeoutSocketCountLastCheck = 0; this.on('free', s => { this.requestCount++; // last enter free queue timestamp s.lastFreeTime = Date.now(); }); this.on('timeout', () => { this.timeoutSocketCount++; }); this.on('close', () => { this.closeSocketCount++; }); this.on('error', () => { this.errorSocketCount++; }); } createSocket(req, options, cb) { super.createSocket(req, options, (err, socket) => { if (err) { this.createSocketErrorCount++; return cb(err); } if (this.keepAlive) { // Disable Nagle's algorithm: http://blog.caustik.com/2012/04/08/scaling-node-js-to-100k-concurrent-connections/ // https://fengmk2.com/benchmark/nagle-algorithm-delayed-ack-mock.html socket.setNoDelay(true); } this.createSocketCount++; cb(null, socket); }); } get statusChanged() { const changed = this.createSocketCount !== this.createSocketCountLastCheck \|\| this.createSocketErrorCount !== this.createSocketErrorCountLastCheck \|\| this.closeSocketCount !== this.closeSocketCountLastCheck \|\| this.errorSocketCount !== this.errorSocketCountLastCheck \|\| this.timeoutSocketCount !== this.timeoutSocketCountLastCheck \|\| this.requestCount !== this.requestCountLastCheck; if (changed) { this.createSocketCountLastCheck = this.createSocketCount; this.createSocketErrorCountLastCheck = this.createSocketErrorCount; this.closeSocketCountLastCheck = this.closeSocketCount; this.errorSocketCountLastCheck = this.errorSocketCount; this.timeoutSocketCountLastCheck = this.timeoutSocketCount; this.requestCountLastCheck = this.requestCount; } return changed; } getCurrentStatus() { return { createSocketCount: this.createSocketCount, createSocketErrorCount: this.createSocketErrorCount, closeSocketCount: this.closeSocketCount, errorSocketCount: this.errorSocketCount, timeoutSocketCount: this.timeoutSocketCount, requestCount: this.requestCount, freeSockets: inspect(this.freeSockets), sockets: inspect(this.sockets), requests: inspect(this.requests), }; } } module.exports = Agent; function inspect(obj) { const res = {}; for (const key in obj) { res[key] = obj[key].length; } return res; } Back

Edit File : agent.js | Size : 4.18 KB

/**
 * 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
 */

'use strict';

const OriginalAgent = require('./_http_agent').Agent;
const ms = require('humanize-ms');

class Agent extends OriginalAgent {
  constructor(options) {
    options = options || {};
    options.keepAlive = options.keepAlive !== false;
    // default is keep-alive and 15s free socket timeout
    if (options.freeSocketKeepAliveTimeout === undefined) {
      options.freeSocketKeepAliveTimeout = 15000;
    }
    // Legacy API: keepAliveTimeout should be rename to `freeSocketKeepAliveTimeout`
    if (options.keepAliveTimeout) {
      options.freeSocketKeepAliveTimeout = options.keepAliveTimeout;
    }
    options.freeSocketKeepAliveTimeout = ms(options.freeSocketKeepAliveTimeout);

// Sets the socket to timeout after timeout milliseconds of inactivity on the socket.
    // By default is double free socket keepalive timeout.
    if (options.timeout === undefined) {
      options.timeout = options.freeSocketKeepAliveTimeout * 2;
      // make sure socket default inactivity timeout >= 30s
      if (options.timeout < 30000) {
        options.timeout = 30000;
      }
    }
    options.timeout = ms(options.timeout);

super(options);

this.createSocketCount = 0;
    this.createSocketCountLastCheck = 0;

this.createSocketErrorCount = 0;
    this.createSocketErrorCountLastCheck = 0;

this.closeSocketCount = 0;
    this.closeSocketCountLastCheck = 0;

// socket error event count
    this.errorSocketCount = 0;
    this.errorSocketCountLastCheck = 0;

this.requestCount = 0;
    this.requestCountLastCheck = 0;

this.timeoutSocketCount = 0;
    this.timeoutSocketCountLastCheck = 0;

this.on('free', s => {
      this.requestCount++;
      // last enter free queue timestamp
      s.lastFreeTime = Date.now();
    });
    this.on('timeout', () => {
      this.timeoutSocketCount++;
    });
    this.on('close', () => {
      this.closeSocketCount++;
    });
    this.on('error', () => {
      this.errorSocketCount++;
    });
  }

createSocket(req, options, cb) {
    super.createSocket(req, options, (err, socket) => {
      if (err) {
        this.createSocketErrorCount++;
        return cb(err);
      }
      if (this.keepAlive) {
        // Disable Nagle's algorithm: http://blog.caustik.com/2012/04/08/scaling-node-js-to-100k-concurrent-connections/
        // https://fengmk2.com/benchmark/nagle-algorithm-delayed-ack-mock.html
        socket.setNoDelay(true);
      }
      this.createSocketCount++;
      cb(null, socket);
    });
  }

get statusChanged() {
    const changed = this.createSocketCount !== this.createSocketCountLastCheck ||
      this.createSocketErrorCount !== this.createSocketErrorCountLastCheck ||
      this.closeSocketCount !== this.closeSocketCountLastCheck ||
      this.errorSocketCount !== this.errorSocketCountLastCheck ||
      this.timeoutSocketCount !== this.timeoutSocketCountLastCheck ||
      this.requestCount !== this.requestCountLastCheck;
    if (changed) {
      this.createSocketCountLastCheck = this.createSocketCount;
      this.createSocketErrorCountLastCheck = this.createSocketErrorCount;
      this.closeSocketCountLastCheck = this.closeSocketCount;
      this.errorSocketCountLastCheck = this.errorSocketCount;
      this.timeoutSocketCountLastCheck = this.timeoutSocketCount;
      this.requestCountLastCheck = this.requestCount;
    }
    return changed;
  }

getCurrentStatus() {
    return {
      createSocketCount: this.createSocketCount,
      createSocketErrorCount: this.createSocketErrorCount,
      closeSocketCount: this.closeSocketCount,
      errorSocketCount: this.errorSocketCount,
      timeoutSocketCount: this.timeoutSocketCount,
      requestCount: this.requestCount,
      freeSockets: inspect(this.freeSockets),
      sockets: inspect(this.sockets),
      requests: inspect(this.requests),
    };
  }
}

module.exports = Agent;

function inspect(obj) {
  const res = {};
  for (const key in obj) {
    res[key] = obj[key].length;
  }
  return res;
}

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