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net: add autoSelectFamily global getter and setter
PR-URL: #45777 Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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test/parallel/test-net-autoselectfamily-commandline-option.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| 'use strict'; | ||
|
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| // Flags: --enable-network-family-autoselection | ||
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| const common = require('../common'); | ||
| const { parseDNSPacket, writeDNSPacket } = require('../common/dns'); | ||
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| const assert = require('assert'); | ||
| const dgram = require('dgram'); | ||
| const { Resolver } = require('dns'); | ||
| const { createConnection, createServer } = require('net'); | ||
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| // Test that happy eyeballs algorithm can be enable from command line. | ||
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| let autoSelectFamilyAttemptTimeout = common.platformTimeout(250); | ||
| if (common.isWindows) { | ||
| // Some of the windows machines in the CI need more time to establish connection | ||
| autoSelectFamilyAttemptTimeout = common.platformTimeout(1500); | ||
| } | ||
|
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| function _lookup(resolver, hostname, options, cb) { | ||
| resolver.resolve(hostname, 'ANY', (err, replies) => { | ||
| assert.notStrictEqual(options.family, 4); | ||
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| if (err) { | ||
| return cb(err); | ||
| } | ||
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| const hosts = replies | ||
| .map((r) => ({ address: r.address, family: r.type === 'AAAA' ? 6 : 4 })) | ||
| .sort((a, b) => b.family - a.family); | ||
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| if (options.all === true) { | ||
| return cb(null, hosts); | ||
| } | ||
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| return cb(null, hosts[0].address, hosts[0].family); | ||
| }); | ||
| } | ||
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| function createDnsServer(ipv6Addr, ipv4Addr, cb) { | ||
| // Create a DNS server which replies with a AAAA and a A record for the same host | ||
| const socket = dgram.createSocket('udp4'); | ||
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| socket.on('message', common.mustCall((msg, { address, port }) => { | ||
| const parsed = parseDNSPacket(msg); | ||
| const domain = parsed.questions[0].domain; | ||
| assert.strictEqual(domain, 'example.org'); | ||
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| socket.send(writeDNSPacket({ | ||
| id: parsed.id, | ||
| questions: parsed.questions, | ||
| answers: [ | ||
| { type: 'AAAA', address: ipv6Addr, ttl: 123, domain: 'example.org' }, | ||
| { type: 'A', address: ipv4Addr, ttl: 123, domain: 'example.org' }, | ||
| ] | ||
| }), port, address); | ||
| })); | ||
|
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| socket.bind(0, () => { | ||
| const resolver = new Resolver(); | ||
| resolver.setServers([`127.0.0.1:${socket.address().port}`]); | ||
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| cb({ dnsServer: socket, lookup: _lookup.bind(null, resolver) }); | ||
| }); | ||
| } | ||
|
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| // Test that IPV4 is reached if IPV6 is not reachable | ||
| { | ||
| createDnsServer('::1', '127.0.0.1', common.mustCall(function({ dnsServer, lookup }) { | ||
| const ipv4Server = createServer((socket) => { | ||
| socket.on('data', common.mustCall(() => { | ||
| socket.write('response-ipv4'); | ||
| socket.end(); | ||
| })); | ||
| }); | ||
|
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| ipv4Server.listen(0, '127.0.0.1', common.mustCall(() => { | ||
| const port = ipv4Server.address().port; | ||
|
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| const connection = createConnection({ | ||
| host: 'example.org', | ||
| port: port, | ||
| lookup, | ||
| autoSelectFamilyAttemptTimeout, | ||
| }); | ||
|
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| let response = ''; | ||
| connection.setEncoding('utf-8'); | ||
|
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| connection.on('ready', common.mustCall(() => { | ||
| assert.deepStrictEqual(connection.autoSelectFamilyAttemptedAddresses, [`::1:${port}`, `127.0.0.1:${port}`]); | ||
| })); | ||
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| connection.on('data', (chunk) => { | ||
| response += chunk; | ||
| }); | ||
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| connection.on('end', common.mustCall(() => { | ||
| assert.strictEqual(response, 'response-ipv4'); | ||
| ipv4Server.close(); | ||
| dnsServer.close(); | ||
| })); | ||
|
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| connection.write('request'); | ||
| })); | ||
| })); | ||
| } |
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