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// Copyright Joyent, Inc. and other Node contributors.
//
// 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.
// patch from https://github.com/nodejs/node/blob/v7.2.1/lib/_http_agent.js
'use strict';
const net = require('net');
const util = require('util');
const EventEmitter = require('events');
const debug = util.debuglog('http');
// New Agent code.
// The largest departure from the previous implementation is that
// an Agent instance holds connections for a variable number of host:ports.
// Surprisingly, this is still API compatible as far as third parties are
// concerned. The only code that really notices the difference is the
// request object.
// Another departure is that all code related to HTTP parsing is in
// ClientRequest.onSocket(). The Agent is now *strictly*
// concerned with managing a connection pool.
function Agent(options) {
if (!(this instanceof Agent))
return new Agent(options);
EventEmitter.call(this);
var self = this;
self.defaultPort = 80;
self.protocol = 'http:';
self.options = util._extend({}, options);
// don't confuse net and make it think that we're connecting to a pipe
self.options.path = null;
self.requests = {};
self.sockets = {};
self.freeSockets = {};
self.keepAliveMsecs = self.options.keepAliveMsecs || 1000;
self.keepAlive = self.options.keepAlive || false;
self.maxSockets = self.options.maxSockets || Agent.defaultMaxSockets;
self.maxFreeSockets = self.options.maxFreeSockets || 256;
// [patch start]
// free keep-alive socket timeout. By default free socket do not have a timeout.
self.freeSocketKeepAliveTimeout = self.options.freeSocketKeepAliveTimeout || 0;
// working socket timeout. By default working socket do not have a timeout.
self.timeout = self.options.timeout || 0;
// the socket active time to live, even if it's in use
this.socketActiveTTL = this.options.socketActiveTTL || null;
// [patch end]
self.on('free', function(socket, options) {
var name = self.getName(options);
debug('agent.on(free)', name);
if (socket.writable &&
self.requests[name] && self.requests[name].length) {
// [patch start]
debug('continue handle next request');
// [patch end]
self.requests[name].shift().onSocket(socket);
if (self.requests[name].length === 0) {
// don't leak
delete self.requests[name];
}
} else {
// If there are no pending requests, then put it in
// the freeSockets pool, but only if we're allowed to do so.
var req = socket._httpMessage;
if (req &&
req.shouldKeepAlive &&
socket.writable &&
self.keepAlive) {
var freeSockets = self.freeSockets[name];
var freeLen = freeSockets ? freeSockets.length : 0;
var count = freeLen;
if (self.sockets[name])
count += self.sockets[name].length;
if (count > self.maxSockets || freeLen >= self.maxFreeSockets) {
socket.destroy();
} else {
freeSockets = freeSockets || [];
self.freeSockets[name] = freeSockets;
socket.setKeepAlive(true, self.keepAliveMsecs);
socket.unref();
socket._httpMessage = null;
self.removeSocket(socket, options);
freeSockets.push(socket);
// [patch start]
// Add a default error handler to avoid Unhandled 'error' event throw on idle socket
// https://github.com/node-modules/agentkeepalive/issues/25
// https://github.com/nodejs/node/pull/4482 (fixed in >= 4.4.0 and >= 5.4.0)
if (socket.listeners('error').length === 0) {
socket.once('error', freeSocketErrorListener);
}
// set free keepalive timer
// try to use socket custom freeSocketKeepAliveTimeout first
const freeSocketKeepAliveTimeout = socket.freeSocketKeepAliveTimeout || self.freeSocketKeepAliveTimeout;
socket.setTimeout(freeSocketKeepAliveTimeout);
debug(`push to free socket queue and wait for ${freeSocketKeepAliveTimeout}ms`);
// [patch end]
}
} else {
socket.destroy();
}
}
});
}
util.inherits(Agent, EventEmitter);
exports.Agent = Agent;
// [patch start]
function freeSocketErrorListener(err) {
var socket = this;
debug('SOCKET ERROR on FREE socket:', err.message, err.stack);
socket.destroy();
socket.emit('agentRemove');
}
// [patch end]
Agent.defaultMaxSockets = Infinity;
Agent.prototype.createConnection = net.createConnection;
// Get the key for a given set of request options
Agent.prototype.getName = function getName(options) {
var name = options.host || 'localhost';
name += ':';
if (options.port)
name += options.port;
name += ':';
if (options.localAddress)
name += options.localAddress;
// Pacify parallel/test-http-agent-getname by only appending
// the ':' when options.family is set.
if (options.family === 4 || options.family === 6)
name += ':' + options.family;
return name;
};
// [patch start]
function handleSocketCreation(req) {
return function(err, newSocket) {
if (err) {
process.nextTick(function() {
req.emit('error', err);
});
return;
}
req.onSocket(newSocket);
}
}
// [patch end]
Agent.prototype.addRequest = function addRequest(req, options, port/*legacy*/,
localAddress/*legacy*/) {
// Legacy API: addRequest(req, host, port, localAddress)
if (typeof options === 'string') {
options = {
host: options,
port,
localAddress
};
}
options = util._extend({}, options);
options = util._extend(options, this.options);
if (!options.servername)
options.servername = calculateServerName(options, req);
var name = this.getName(options);
if (!this.sockets[name]) {
this.sockets[name] = [];
}
var freeLen = this.freeSockets[name] ? this.freeSockets[name].length : 0;
var sockLen = freeLen + this.sockets[name].length;
if (freeLen) {
// we have a free socket, so use that.
var socket = this.freeSockets[name].shift();
debug('have free socket');
// [patch start]
// remove free socket error event handler
socket.removeListener('error', freeSocketErrorListener);
// restart the default timer
socket.setTimeout(this.timeout);
if (this.socketActiveTTL && Date.now() - socket.createdTime > this.socketActiveTTL) {
debug(`socket ${socket.createdTime} expired`);
socket.destroy();
return this.createSocket(req, options, handleSocketCreation(req));
}
// [patch end]
// don't leak
if (!this.freeSockets[name].length)
delete this.freeSockets[name];
socket.ref();
req.onSocket(socket);
this.sockets[name].push(socket);
} else if (sockLen < this.maxSockets) {
debug('call onSocket', sockLen, freeLen);
// If we are under maxSockets create a new one.
// [patch start]
this.createSocket(req, options, handleSocketCreation(req));
// [patch end]
} else {
debug('wait for socket');
// We are over limit so we'll add it to the queue.
if (!this.requests[name]) {
this.requests[name] = [];
}
this.requests[name].push(req);
}
};
Agent.prototype.createSocket = function createSocket(req, options, cb) {
var self = this;
options = util._extend({}, options);
options = util._extend(options, self.options);
if (!options.servername)
options.servername = calculateServerName(options, req);
var name = self.getName(options);
options._agentKey = name;
debug('createConnection', name, options);
options.encoding = null;
var called = false;
const newSocket = self.createConnection(options, oncreate);
// [patch start]
if (newSocket) {
oncreate(null, Object.assign(newSocket, { createdTime: Date.now() }));
}
// [patch end]
function oncreate(err, s) {
if (called)
return;
called = true;
if (err)
return cb(err);
if (!self.sockets[name]) {
self.sockets[name] = [];
}
self.sockets[name].push(s);
debug('sockets', name, self.sockets[name].length);
function onFree() {
self.emit('free', s, options);
}
s.on('free', onFree);
function onClose(err) {
debug('CLIENT socket onClose');
// This is the only place where sockets get removed from the Agent.
// If you want to remove a socket from the pool, just close it.
// All socket errors end in a close event anyway.
self.removeSocket(s, options);
// [patch start]
self.emit('close');
// [patch end]
}
s.on('close', onClose);
// [patch start]
// start socket timeout handler
function onTimeout() {
debug('CLIENT socket onTimeout');
s.destroy();
// Remove it from freeSockets immediately to prevent new requests from being sent through this socket.
self.removeSocket(s, options);
self.emit('timeout');
}
s.on('timeout', onTimeout);
// set the default timer
s.setTimeout(self.timeout);
// [patch end]
function onRemove() {
// We need this function for cases like HTTP 'upgrade'
// (defined by WebSockets) where we need to remove a socket from the
// pool because it'll be locked up indefinitely
debug('CLIENT socket onRemove');
self.removeSocket(s, options);
s.removeListener('close', onClose);
s.removeListener('free', onFree);
s.removeListener('agentRemove', onRemove);
// [patch start]
// remove socket timeout handler
s.setTimeout(0, onTimeout);
// [patch end]
}
s.on('agentRemove', onRemove);
cb(null, s);
}
};
function calculateServerName(options, req) {
let servername = options.host;
const hostHeader = req.getHeader('host');
if (hostHeader) {
// abc => abc
// abc:123 => abc
// [::1] => ::1
// [::1]:123 => ::1
if (hostHeader.startsWith('[')) {
const index = hostHeader.indexOf(']');
if (index === -1) {
// Leading '[', but no ']'. Need to do something...
servername = hostHeader;
} else {
servername = hostHeader.substr(1, index - 1);
}
} else {
servername = hostHeader.split(':', 1)[0];
}
}
return servername;
}
Agent.prototype.removeSocket = function removeSocket(s, options) {
var name = this.getName(options);
debug('removeSocket', name, 'writable:', s.writable);
var sets = [this.sockets];
// If the socket was destroyed, remove it from the free buffers too.
if (!s.writable)
sets.push(this.freeSockets);
for (var sk = 0; sk < sets.length; sk++) {
var sockets = sets[sk];
if (sockets[name]) {
var index = sockets[name].indexOf(s);
if (index !== -1) {
sockets[name].splice(index, 1);
// Don't leak
if (sockets[name].length === 0)
delete sockets[name];
}
}
}
// [patch start]
var freeLen = this.freeSockets[name] ? this.freeSockets[name].length : 0;
var sockLen = freeLen + (this.sockets[name] ? this.sockets[name].length : 0);
// [patch end]
if (this.requests[name] && this.requests[name].length && sockLen < this.maxSockets) {
debug('removeSocket, have a request, make a socket');
var req = this.requests[name][0];
// If we have pending requests and a socket gets closed make a new one
this.createSocket(req, options, function(err, newSocket) {
if (err) {
process.nextTick(function() {
req.emit('error', err);
});
return;
}
newSocket.emit('free');
});
}
};
Agent.prototype.destroy = function destroy() {
var sets = [this.freeSockets, this.sockets];
for (var s = 0; s < sets.length; s++) {
var set = sets[s];
var keys = Object.keys(set);
for (var v = 0; v < keys.length; v++) {
var setName = set[keys[v]];
for (var n = 0; n < setName.length; n++) {
setName[n].destroy();
}
}
}
};
exports.globalAgent = new Agent();