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Viewing file:     auto.js (5.26 KB)      -rw-r--r--

'use strict';
// See https://github.com/facebook/jest/issues/2549
// eslint-disable-next-line node/prefer-global/url
const {URL, urlToHttpOptions} = require('url');
const http = require('http');
const https = require('https');
const resolveALPN = require('resolve-alpn');
const QuickLRU = require('quick-lru');
const {Agent, globalAgent} = require('./agent.js');
const Http2ClientRequest = require('./client-request.js');
const calculateServerName = require('./utils/calculate-server-name.js');
const delayAsyncDestroy = require('./utils/delay-async-destroy.js');

const cache = new QuickLRU({maxSize: 100});
const queue = new Map();

const installSocket = (agent, socket, options) => {
	socket._httpMessage = {shouldKeepAlive: true};

	const onFree = () => {
		agent.emit('free', socket, options);
	};

	socket.on('free', onFree);

	const onClose = () => {
		agent.removeSocket(socket, options);
	};

	socket.on('close', onClose);

	const onTimeout = () => {
		const {freeSockets} = agent;

		for (const sockets of Object.values(freeSockets)) {
			if (sockets.includes(socket)) {
				socket.destroy();
				return;
			}
		}
	};

	socket.on('timeout', onTimeout);

	const onRemove = () => {
		agent.removeSocket(socket, options);
		socket.off('close', onClose);
		socket.off('free', onFree);
		socket.off('timeout', onTimeout);
		socket.off('agentRemove', onRemove);
	};

	socket.on('agentRemove', onRemove);

	agent.emit('free', socket, options);
};

const createResolveProtocol = (cache, queue = new Map(), connect = undefined) => {
	return async options => {
		const name = `${options.host}:${options.port}:${options.ALPNProtocols.sort()}`;

		if (!cache.has(name)) {
			if (queue.has(name)) {
				const result = await queue.get(name);
				return {alpnProtocol: result.alpnProtocol};
			}

			const {path} = options;
			options.path = options.socketPath;

			const resultPromise = resolveALPN(options, connect);
			queue.set(name, resultPromise);

			try {
				const result = await resultPromise;

				cache.set(name, result.alpnProtocol);
				queue.delete(name);

				options.path = path;

				return result;
			} catch (error) {
				queue.delete(name);

				options.path = path;

				throw error;
			}
		}

		return {alpnProtocol: cache.get(name)};
	};
};

const defaultResolveProtocol = createResolveProtocol(cache, queue);

module.exports = async (input, options, callback) => {
	if (typeof input === 'string') {
		input = urlToHttpOptions(new URL(input));
	} else if (input instanceof URL) {
		input = urlToHttpOptions(input);
	} else {
		input = {...input};
	}

	if (typeof options === 'function' || options === undefined) {
		// (options, callback)
		callback = options;
		options = input;
	} else {
		// (input, options, callback)
		options = Object.assign(input, options);
	}

	options.ALPNProtocols = options.ALPNProtocols || ['h2', 'http/1.1'];

	if (!Array.isArray(options.ALPNProtocols) || options.ALPNProtocols.length === 0) {
		throw new Error('The `ALPNProtocols` option must be an Array with at least one entry');
	}

	options.protocol = options.protocol || 'https:';
	const isHttps = options.protocol === 'https:';

	options.host = options.hostname || options.host || 'localhost';
	options.session = options.tlsSession;
	options.servername = options.servername || calculateServerName((options.headers && options.headers.host) || options.host);
	options.port = options.port || (isHttps ? 443 : 80);
	options._defaultAgent = isHttps ? https.globalAgent : http.globalAgent;

	const resolveProtocol = options.resolveProtocol || defaultResolveProtocol;

	// Note: We don't support `h2session` here

	let {agent} = options;
	if (agent !== undefined && agent !== false && agent.constructor.name !== 'Object') {
		throw new Error('The `options.agent` can be only an object `http`, `https` or `http2` properties');
	}

	if (isHttps) {
		options.resolveSocket = true;

		let {socket, alpnProtocol, timeout} = await resolveProtocol(options);

		if (timeout) {
			if (socket) {
				socket.destroy();
			}

			const error = new Error(`Timed out resolving ALPN: ${options.timeout} ms`);
			error.code = 'ETIMEDOUT';
			error.ms = options.timeout;

			throw error;
		}

		// We can't accept custom `createConnection` because the API is different for HTTP/2
		if (socket && options.createConnection) {
			socket.destroy();
			socket = undefined;
		}

		delete options.resolveSocket;

		const isHttp2 = alpnProtocol === 'h2';

		if (agent) {
			agent = isHttp2 ? agent.http2 : agent.https;
			options.agent = agent;
		}

		if (agent === undefined) {
			agent = isHttp2 ? globalAgent : https.globalAgent;
		}

		if (socket) {
			if (agent === false) {
				socket.destroy();
			} else {
				const defaultCreateConnection = (isHttp2 ? Agent : https.Agent).prototype.createConnection;

				if (agent.createConnection === defaultCreateConnection) {
					if (isHttp2) {
						options._reuseSocket = socket;
					} else {
						installSocket(agent, socket, options);
					}
				} else {
					socket.destroy();
				}
			}
		}

		if (isHttp2) {
			return delayAsyncDestroy(new Http2ClientRequest(options, callback));
		}
	} else if (agent) {
		options.agent = agent.http;
	}

	return delayAsyncDestroy(http.request(options, callback));
};

module.exports.protocolCache = cache;
module.exports.resolveProtocol = defaultResolveProtocol;
module.exports.createResolveProtocol = createResolveProtocol;