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'use strict'
const net = require('net')
const assert = require('assert')
const util = require('./util')
const { InvalidArgumentError, ConnectTimeoutError } = require('./errors')
let tls // include tls conditionally since it is not always available
// TODO: session re-use does not wait for the first
// connection to resolve the session and might therefore
// resolve the same servername multiple times even when
// re-use is enabled.
let SessionCache
// FIXME: remove workaround when the Node bug is fixed
// https://github.com/nodejs/node/issues/49344#issuecomment-1741776308
if (global.FinalizationRegistry && !process.env.NODE_V8_COVERAGE) {
SessionCache = class WeakSessionCache {
constructor (maxCachedSessions) {
this._maxCachedSessions = maxCachedSessions
this._sessionCache = new Map()
this._sessionRegistry = new global.FinalizationRegistry((key) => {
if (this._sessionCache.size < this._maxCachedSessions) {
return
}
const ref = this._sessionCache.get(key)
if (ref !== undefined && ref.deref() === undefined) {
this._sessionCache.delete(key)
}
})
}
get (sessionKey) {
const ref = this._sessionCache.get(sessionKey)
return ref ? ref.deref() : null
}
set (sessionKey, session) {
if (this._maxCachedSessions === 0) {
return
}
this._sessionCache.set(sessionKey, new WeakRef(session))
this._sessionRegistry.register(session, sessionKey)
}
}
} else {
SessionCache = class SimpleSessionCache {
constructor (maxCachedSessions) {
this._maxCachedSessions = maxCachedSessions
this._sessionCache = new Map()
}
get (sessionKey) {
return this._sessionCache.get(sessionKey)
}
set (sessionKey, session) {
if (this._maxCachedSessions === 0) {
return
}
if (this._sessionCache.size >= this._maxCachedSessions) {
// remove the oldest session
const { value: oldestKey } = this._sessionCache.keys().next()
this._sessionCache.delete(oldestKey)
}
this._sessionCache.set(sessionKey, session)
}
}
}
function buildConnector ({ allowH2, maxCachedSessions, socketPath, timeout, ...opts }) {
if (maxCachedSessions != null && (!Number.isInteger(maxCachedSessions) || maxCachedSessions < 0)) {
throw new InvalidArgumentError('maxCachedSessions must be a positive integer or zero')
}
const options = { path: socketPath, ...opts }
const sessionCache = new SessionCache(maxCachedSessions == null ? 100 : maxCachedSessions)
timeout = timeout == null ? 10e3 : timeout
allowH2 = allowH2 != null ? allowH2 : false
return function connect ({ hostname, host, protocol, port, servername, localAddress, httpSocket }, callback) {
let socket
if (protocol === 'https:') {
if (!tls) {
tls = require('tls')
}
servername = servername || options.servername || util.getServerName(host) || null
const sessionKey = servername || hostname
const session = sessionCache.get(sessionKey) || null
assert(sessionKey)
socket = tls.connect({
highWaterMark: 16384, // TLS in node can't have bigger HWM anyway...
...options,
servername,
session,
localAddress,
// TODO(HTTP/2): Add support for h2c
ALPNProtocols: allowH2 ? ['http/1.1', 'h2'] : ['http/1.1'],
socket: httpSocket, // upgrade socket connection
port: port || 443,
host: hostname
})
socket
.on('session', function (session) {
// TODO (fix): Can a session become invalid once established? Don't think so?
sessionCache.set(sessionKey, session)
})
} else {
assert(!httpSocket, 'httpSocket can only be sent on TLS update')
socket = net.connect({
highWaterMark: 64 * 1024, // Same as nodejs fs streams.
...options,
localAddress,
port: port || 80,
host: hostname
})
}
// Set TCP keep alive options on the socket here instead of in connect() for the case of assigning the socket
if (options.keepAlive == null || options.keepAlive) {
const keepAliveInitialDelay = options.keepAliveInitialDelay === undefined ? 60e3 : options.keepAliveInitialDelay
socket.setKeepAlive(true, keepAliveInitialDelay)
}
const cancelTimeout = setupTimeout(() => onConnectTimeout(socket), timeout)
socket
.setNoDelay(true)
.once(protocol === 'https:' ? 'secureConnect' : 'connect', function () {
cancelTimeout()
if (callback) {
const cb = callback
callback = null
cb(null, this)
}
})
.on('error', function (err) {
cancelTimeout()
if (callback) {
const cb = callback
callback = null
cb(err)
}
})
return socket
}
}
function setupTimeout (onConnectTimeout, timeout) {
if (!timeout) {
return () => {}
}
let s1 = null
let s2 = null
const timeoutId = setTimeout(() => {
// setImmediate is added to make sure that we priotorise socket error events over timeouts
s1 = setImmediate(() => {
if (process.platform === 'win32') {
// Windows needs an extra setImmediate probably due to implementation differences in the socket logic
s2 = setImmediate(() => onConnectTimeout())
} else {
onConnectTimeout()
}
})
}, timeout)
return () => {
clearTimeout(timeoutId)
clearImmediate(s1)
clearImmediate(s2)
}
}
function onConnectTimeout (socket) {
util.destroy(socket, new ConnectTimeoutError())
}
module.exports = buildConnector
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