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Edit File : index.js \| Size : 4.30 KB
'use strict'; require('./patch-core'); const inherits = require('util').inherits; const promisify = require('es6-promisify'); const EventEmitter = require('events').EventEmitter; module.exports = Agent; function isAgent(v) { return v && typeof v.addRequest === 'function'; } /** * Base `http.Agent` implementation. * No pooling/keep-alive is implemented by default. * * @param {Function} callback * @api public / function Agent(callback, _opts) { if (!(this instanceof Agent)) { return new Agent(callback, _opts); } EventEmitter.call(this); // The callback gets promisified if it has 3 parameters // (i.e. it has a callback function) lazily this._promisifiedCallback = false; let opts = _opts; if ('function' === typeof callback) { this.callback = callback; } else if (callback) { opts = callback; } // timeout for the socket to be returned from the callback this.timeout = (opts && opts.timeout) \|\| null; this.options = opts; } inherits(Agent, EventEmitter); /* * Override this function in your subclass! / Agent.prototype.callback = function callback(req, opts) { throw new Error( '"agent-base" has no default implementation, you must subclass and override `callback()`' ); }; /* * Called by node-core's "_http_client.js" module when creating * a new HTTP request with this Agent instance. * * @api public */ Agent.prototype.addRequest = function addRequest(req, _opts) { const ownOpts = Object.assign({}, _opts); // Set default `host` for HTTP to localhost if (null == ownOpts.host) { ownOpts.host = 'localhost'; } // Set default `port` for HTTP if none was explicitly specified if (null == ownOpts.port) { ownOpts.port = ownOpts.secureEndpoint ? 443 : 80; } const opts = Object.assign({}, this.options, ownOpts); if (opts.host && opts.path) { // If both a `host` and `path` are specified then it's most likely the // result of a `url.parse()` call... we need to remove the `path` portion so // that `net.connect()` doesn't attempt to open that as a unix socket file. delete opts.path; } delete opts.agent; delete opts.hostname; delete opts._defaultAgent; delete opts.defaultPort; delete opts.createConnection; // Hint to use "Connection: close" // XXX: non-documented `http` module API :( req._last = true; req.shouldKeepAlive = false; // Create the `stream.Duplex` instance let timeout; let timedOut = false; const timeoutMs = this.timeout; const freeSocket = this.freeSocket; function onerror(err) { if (req._hadError) return; req.emit('error', err); // For Safety. Some additional errors might fire later on // and we need to make sure we don't double-fire the error event. req._hadError = true; } function ontimeout() { timeout = null; timedOut = true; const err = new Error( 'A "socket" was not created for HTTP request before ' + timeoutMs + 'ms' ); err.code = 'ETIMEOUT'; onerror(err); } function callbackError(err) { if (timedOut) return; if (timeout != null) { clearTimeout(timeout); timeout = null; } onerror(err); } function onsocket(socket) { if (timedOut) return; if (timeout != null) { clearTimeout(timeout); timeout = null; } if (isAgent(socket)) { // `socket` is actually an http.Agent instance, so relinquish // responsibility for this `req` to the Agent from here on socket.addRequest(req, opts); } else if (socket) { function onfree() { freeSocket(socket, opts); } socket.on('free', onfree); req.onSocket(socket); } else { const err = new Error( 'no Duplex stream was returned to agent-base for `' + req.method + ' ' + req.path + '`' ); onerror(err); } } if (!this._promisifiedCallback && this.callback.length >= 3) { // Legacy callback function - convert to a Promise this.callback = promisify(this.callback, this); this._promisifiedCallback = true; } if (timeoutMs > 0) { timeout = setTimeout(ontimeout, timeoutMs); } try { Promise.resolve(this.callback(req, opts)).then(onsocket, callbackError); } catch (err) { Promise.reject(err).catch(callbackError); } }; Agent.prototype.freeSocket = function freeSocket(socket, opts) { // TODO reuse sockets socket.destroy(); }; Back

Edit File : index.js | Size : 4.30 KB

'use strict';
require('./patch-core');
const inherits = require('util').inherits;
const promisify = require('es6-promisify');
const EventEmitter = require('events').EventEmitter;

module.exports = Agent;

function isAgent(v) {
  return v && typeof v.addRequest === 'function';
}

/**
 * Base `http.Agent` implementation.
 * No pooling/keep-alive is implemented by default.
 *
 * @param {Function} callback
 * @api public
 */
function Agent(callback, _opts) {
  if (!(this instanceof Agent)) {
    return new Agent(callback, _opts);
  }

EventEmitter.call(this);

// The callback gets promisified if it has 3 parameters
  // (i.e. it has a callback function) lazily
  this._promisifiedCallback = false;

let opts = _opts;
  if ('function' === typeof callback) {
    this.callback = callback;
  } else if (callback) {
    opts = callback;
  }

// timeout for the socket to be returned from the callback
  this.timeout = (opts && opts.timeout) || null;

this.options = opts;
}
inherits(Agent, EventEmitter);

/**
 * Override this function in your subclass!
 */
Agent.prototype.callback = function callback(req, opts) {
  throw new Error(
    '"agent-base" has no default implementation, you must subclass and override `callback()`'
  );
};

/**
 * Called by node-core's "_http_client.js" module when creating
 * a new HTTP request with this Agent instance.
 *
 * @api public
 */
Agent.prototype.addRequest = function addRequest(req, _opts) {
  const ownOpts = Object.assign({}, _opts);

// Set default `host` for HTTP to localhost
  if (null == ownOpts.host) {
    ownOpts.host = 'localhost';
  }

// Set default `port` for HTTP if none was explicitly specified
  if (null == ownOpts.port) {
    ownOpts.port = ownOpts.secureEndpoint ? 443 : 80;
  }

const opts = Object.assign({}, this.options, ownOpts);

if (opts.host && opts.path) {
    // If both a `host` and `path` are specified then it's most likely the
    // result of a `url.parse()` call... we need to remove the `path` portion so
    // that `net.connect()` doesn't attempt to open that as a unix socket file.
    delete opts.path;
  }

delete opts.agent;
  delete opts.hostname;
  delete opts._defaultAgent;
  delete opts.defaultPort;
  delete opts.createConnection;

// Hint to use "Connection: close"
  // XXX: non-documented `http` module API :(
  req._last = true;
  req.shouldKeepAlive = false;

// Create the `stream.Duplex` instance
  let timeout;
  let timedOut = false;
  const timeoutMs = this.timeout;
  const freeSocket = this.freeSocket;

function onerror(err) {
    if (req._hadError) return;
    req.emit('error', err);
    // For Safety. Some additional errors might fire later on
    // and we need to make sure we don't double-fire the error event.
    req._hadError = true;
  }

function ontimeout() {
    timeout = null;
    timedOut = true;
    const err = new Error(
      'A "socket" was not created for HTTP request before ' + timeoutMs + 'ms'
    );
    err.code = 'ETIMEOUT';
    onerror(err);
  }

function callbackError(err) {
    if (timedOut) return;
    if (timeout != null) {
      clearTimeout(timeout);
      timeout = null;
    }
    onerror(err);
  }

if (!this._promisifiedCallback && this.callback.length >= 3) {
    // Legacy callback function - convert to a Promise
    this.callback = promisify(this.callback, this);
    this._promisifiedCallback = true;
  }

if (timeoutMs > 0) {
    timeout = setTimeout(ontimeout, timeoutMs);
  }

try {
    Promise.resolve(this.callback(req, opts)).then(onsocket, callbackError);
  } catch (err) {
    Promise.reject(err).catch(callbackError);
  }
};

Agent.prototype.freeSocket = function freeSocket(socket, opts) {
  // TODO reuse sockets
  socket.destroy();
};

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