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'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;
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) {
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);
}
};
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