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416 lines
13 KiB
416 lines
13 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// patch from https://github.com/nodejs/node/blob/v7.2.1/lib/_http_agent.js
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'use strict';
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const net = require('net');
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const util = require('util');
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const EventEmitter = require('events');
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const debug = util.debuglog('http');
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// New Agent code.
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// The largest departure from the previous implementation is that
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// an Agent instance holds connections for a variable number of host:ports.
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// Surprisingly, this is still API compatible as far as third parties are
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// concerned. The only code that really notices the difference is the
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// request object.
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// Another departure is that all code related to HTTP parsing is in
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// ClientRequest.onSocket(). The Agent is now *strictly*
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// concerned with managing a connection pool.
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function Agent(options) {
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if (!(this instanceof Agent))
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return new Agent(options);
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EventEmitter.call(this);
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var self = this;
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self.defaultPort = 80;
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self.protocol = 'http:';
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self.options = Object.assign({}, options);
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// don't confuse net and make it think that we're connecting to a pipe
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self.options.path = null;
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self.requests = {};
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self.sockets = {};
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self.freeSockets = {};
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self.keepAliveMsecs = self.options.keepAliveMsecs || 1000;
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self.keepAlive = self.options.keepAlive || false;
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self.maxSockets = self.options.maxSockets || Agent.defaultMaxSockets;
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self.maxFreeSockets = self.options.maxFreeSockets || 256;
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// [patch start]
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// free keep-alive socket timeout. By default free socket do not have a timeout.
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self.freeSocketKeepAliveTimeout = self.options.freeSocketKeepAliveTimeout || 0;
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// working socket timeout. By default working socket do not have a timeout.
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self.timeout = self.options.timeout || 0;
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// the socket active time to live, even if it's in use
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this.socketActiveTTL = this.options.socketActiveTTL || null;
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// [patch end]
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self.on('free', function(socket, options) {
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var name = self.getName(options);
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debug('agent.on(free)', name);
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if (socket.writable &&
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self.requests[name] && self.requests[name].length) {
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// [patch start]
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debug('continue handle next request');
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// [patch end]
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self.requests[name].shift().onSocket(socket);
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if (self.requests[name].length === 0) {
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// don't leak
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delete self.requests[name];
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}
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} else {
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// If there are no pending requests, then put it in
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// the freeSockets pool, but only if we're allowed to do so.
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var req = socket._httpMessage;
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if (req &&
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req.shouldKeepAlive &&
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socket.writable &&
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self.keepAlive) {
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var freeSockets = self.freeSockets[name];
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var freeLen = freeSockets ? freeSockets.length : 0;
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var count = freeLen;
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if (self.sockets[name])
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count += self.sockets[name].length;
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if (count > self.maxSockets || freeLen >= self.maxFreeSockets) {
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socket.destroy();
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} else {
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freeSockets = freeSockets || [];
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self.freeSockets[name] = freeSockets;
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socket.setKeepAlive(true, self.keepAliveMsecs);
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socket.unref();
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socket._httpMessage = null;
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self.removeSocket(socket, options);
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freeSockets.push(socket);
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// [patch start]
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// Add a default error handler to avoid Unhandled 'error' event throw on idle socket
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// https://github.com/node-modules/agentkeepalive/issues/25
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// https://github.com/nodejs/node/pull/4482 (fixed in >= 4.4.0 and >= 5.4.0)
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if (socket.listeners('error').length === 0) {
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socket.once('error', freeSocketErrorListener);
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}
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// set free keepalive timer
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// try to use socket custom freeSocketKeepAliveTimeout first
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const freeSocketKeepAliveTimeout = socket.freeSocketKeepAliveTimeout || self.freeSocketKeepAliveTimeout;
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socket.setTimeout(freeSocketKeepAliveTimeout);
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debug(`push to free socket queue and wait for ${freeSocketKeepAliveTimeout}ms`);
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// [patch end]
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}
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} else {
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socket.destroy();
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}
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}
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});
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}
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util.inherits(Agent, EventEmitter);
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exports.Agent = Agent;
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// [patch start]
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function freeSocketErrorListener(err) {
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var socket = this;
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debug('SOCKET ERROR on FREE socket:', err.message, err.stack);
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socket.destroy();
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socket.emit('agentRemove');
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}
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// [patch end]
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Agent.defaultMaxSockets = Infinity;
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Agent.prototype.createConnection = net.createConnection;
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// Get the key for a given set of request options
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Agent.prototype.getName = function getName(options) {
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var name = options.host || 'localhost';
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name += ':';
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if (options.port)
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name += options.port;
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name += ':';
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if (options.localAddress)
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name += options.localAddress;
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// Pacify parallel/test-http-agent-getname by only appending
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// the ':' when options.family is set.
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if (options.family === 4 || options.family === 6)
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name += ':' + options.family;
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return name;
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};
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// [patch start]
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function handleSocketCreation(req) {
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return function(err, newSocket) {
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if (err) {
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process.nextTick(function() {
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req.emit('error', err);
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});
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return;
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}
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req.onSocket(newSocket);
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}
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}
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// [patch end]
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Agent.prototype.addRequest = function addRequest(req, options, port/*legacy*/,
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localAddress/*legacy*/) {
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// Legacy API: addRequest(req, host, port, localAddress)
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if (typeof options === 'string') {
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options = {
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host: options,
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port,
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localAddress
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};
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}
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options = Object.assign({}, options);
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options = Object.assign(options, this.options);
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if (!options.servername)
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options.servername = calculateServerName(options, req);
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var name = this.getName(options);
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if (!this.sockets[name]) {
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this.sockets[name] = [];
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}
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var freeLen = this.freeSockets[name] ? this.freeSockets[name].length : 0;
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var sockLen = freeLen + this.sockets[name].length;
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if (freeLen) {
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// we have a free socket, so use that.
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var socket = this.freeSockets[name].shift();
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debug('have free socket');
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// [patch start]
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// remove free socket error event handler
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socket.removeListener('error', freeSocketErrorListener);
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// restart the default timer
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socket.setTimeout(this.timeout);
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if (this.socketActiveTTL && Date.now() - socket.createdTime > this.socketActiveTTL) {
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debug(`socket ${socket.createdTime} expired`);
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socket.destroy();
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return this.createSocket(req, options, handleSocketCreation(req));
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}
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// [patch end]
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// don't leak
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if (!this.freeSockets[name].length)
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delete this.freeSockets[name];
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socket.ref();
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req.onSocket(socket);
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this.sockets[name].push(socket);
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} else if (sockLen < this.maxSockets) {
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debug('call onSocket', sockLen, freeLen);
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// If we are under maxSockets create a new one.
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// [patch start]
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this.createSocket(req, options, handleSocketCreation(req));
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// [patch end]
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} else {
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debug('wait for socket');
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// We are over limit so we'll add it to the queue.
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if (!this.requests[name]) {
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this.requests[name] = [];
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}
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this.requests[name].push(req);
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}
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};
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Agent.prototype.createSocket = function createSocket(req, options, cb) {
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var self = this;
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options = Object.assign({}, options);
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options = Object.assign(options, self.options);
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if (!options.servername)
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options.servername = calculateServerName(options, req);
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var name = self.getName(options);
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options._agentKey = name;
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debug('createConnection', name, options);
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options.encoding = null;
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var called = false;
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const newSocket = self.createConnection(options, oncreate);
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// [patch start]
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if (newSocket) {
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oncreate(null, Object.assign(newSocket, { createdTime: Date.now() }));
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}
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// [patch end]
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function oncreate(err, s) {
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if (called)
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return;
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called = true;
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if (err)
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return cb(err);
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if (!self.sockets[name]) {
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self.sockets[name] = [];
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}
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self.sockets[name].push(s);
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debug('sockets', name, self.sockets[name].length);
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function onFree() {
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self.emit('free', s, options);
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}
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s.on('free', onFree);
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function onClose(err) {
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debug('CLIENT socket onClose');
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// This is the only place where sockets get removed from the Agent.
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// If you want to remove a socket from the pool, just close it.
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// All socket errors end in a close event anyway.
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self.removeSocket(s, options);
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// [patch start]
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self.emit('close');
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// [patch end]
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}
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s.on('close', onClose);
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// [patch start]
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// start socket timeout handler
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function onTimeout() {
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debug('CLIENT socket onTimeout');
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s.destroy();
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// Remove it from freeSockets immediately to prevent new requests from being sent through this socket.
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self.removeSocket(s, options);
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self.emit('timeout');
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}
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s.on('timeout', onTimeout);
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// set the default timer
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s.setTimeout(self.timeout);
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// [patch end]
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function onRemove() {
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// We need this function for cases like HTTP 'upgrade'
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// (defined by WebSockets) where we need to remove a socket from the
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// pool because it'll be locked up indefinitely
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debug('CLIENT socket onRemove');
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self.removeSocket(s, options);
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s.removeListener('close', onClose);
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s.removeListener('free', onFree);
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s.removeListener('agentRemove', onRemove);
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// [patch start]
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// remove socket timeout handler
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s.setTimeout(0, onTimeout);
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// [patch end]
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}
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s.on('agentRemove', onRemove);
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cb(null, s);
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}
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};
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function calculateServerName(options, req) {
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let servername = options.host;
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const hostHeader = req.getHeader('host');
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if (hostHeader) {
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// abc => abc
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// abc:123 => abc
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// [::1] => ::1
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// [::1]:123 => ::1
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if (hostHeader.startsWith('[')) {
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const index = hostHeader.indexOf(']');
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if (index === -1) {
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// Leading '[', but no ']'. Need to do something...
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servername = hostHeader;
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} else {
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servername = hostHeader.substr(1, index - 1);
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}
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} else {
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servername = hostHeader.split(':', 1)[0];
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}
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}
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return servername;
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}
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Agent.prototype.removeSocket = function removeSocket(s, options) {
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var name = this.getName(options);
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debug('removeSocket', name, 'writable:', s.writable);
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var sets = [this.sockets];
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// If the socket was destroyed, remove it from the free buffers too.
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if (!s.writable)
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sets.push(this.freeSockets);
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for (var sk = 0; sk < sets.length; sk++) {
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var sockets = sets[sk];
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if (sockets[name]) {
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var index = sockets[name].indexOf(s);
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if (index !== -1) {
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sockets[name].splice(index, 1);
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// Don't leak
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if (sockets[name].length === 0)
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delete sockets[name];
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}
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}
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}
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// [patch start]
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var freeLen = this.freeSockets[name] ? this.freeSockets[name].length : 0;
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var sockLen = freeLen + (this.sockets[name] ? this.sockets[name].length : 0);
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// [patch end]
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if (this.requests[name] && this.requests[name].length && sockLen < this.maxSockets) {
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debug('removeSocket, have a request, make a socket');
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var req = this.requests[name][0];
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// If we have pending requests and a socket gets closed make a new one
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this.createSocket(req, options, function(err, newSocket) {
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if (err) {
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process.nextTick(function() {
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req.emit('error', err);
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});
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return;
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}
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newSocket.emit('free');
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});
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}
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};
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Agent.prototype.destroy = function destroy() {
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var sets = [this.freeSockets, this.sockets];
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for (var s = 0; s < sets.length; s++) {
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var set = sets[s];
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var keys = Object.keys(set);
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for (var v = 0; v < keys.length; v++) {
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var setName = set[keys[v]];
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for (var n = 0; n < setName.length; n++) {
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setName[n].destroy();
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}
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}
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}
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};
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exports.globalAgent = new Agent();
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