switch from c-ares to getdns #38184
dns: switch to getdns
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,249 @@ | ||
| 'use strict'; | ||
|
|
||
| const { | ||
| ArrayPrototypeFilter, | ||
| ArrayPrototypeMap, | ||
| ArrayPrototypeSort, | ||
| JSONParse, | ||
| StringPrototypeReplace, | ||
| Symbol, | ||
| } = primordials; | ||
|
|
||
| const { | ||
| DNSWrap, | ||
| GetNameInfoReqWrap, | ||
| getnameinfo, | ||
| } = internalBinding('dns'); | ||
| const { Buffer } = require('buffer'); | ||
| const { dnsException } = require('internal/errors'); | ||
| const { AsyncResource } = require('async_hooks'); | ||
|
|
||
| const kResource = Symbol('kResource'); | ||
| const kOnComplete = Symbol('kOnComplete'); | ||
|
|
||
| class ReqWrap { | ||
| constructor(name) { | ||
| this[kResource] = new AsyncResource(name); | ||
| this[kOnComplete] = undefined; | ||
| } | ||
|
|
||
| set oncomplete(f) { | ||
| this[kOnComplete] = function(...args) { | ||
| try { | ||
| return this[kResource].runInAsyncScope(f, this, ...args); | ||
| } finally { | ||
| this[kResource].emitDestroy(); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| get oncomplete() { | ||
| return this[kOnComplete]; | ||
| } | ||
| } | ||
|
|
||
| class QueryReqWrap extends ReqWrap { | ||
| constructor() { | ||
| super('QUERYWRAP'); | ||
| } | ||
| } | ||
|
|
||
| class GetAddrInfoReqWrap extends ReqWrap { | ||
| constructor() { | ||
| super('GETADDRINFOREQWRAP'); | ||
| } | ||
| } | ||
|
|
||
| function unwrapBindata(s, isFQDN = false) { | ||
| if (typeof s !== 'string') { | ||
| s = Buffer.from(s).toString(); | ||
| } | ||
| if (isFQDN) { | ||
| s = StringPrototypeReplace(s, /\.$/, ''); | ||
| } | ||
| return s; | ||
| } | ||
|
|
||
| const DNS_MAP_FNS = {}; | ||
| const DNS_MAP_TYPES = {}; | ||
| [ | ||
| // https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml | ||
| ['Any', 255, (answer, req) => { | ||
| let mapped = DNS_MAP_FNS[answer.type](answer, { ttl: true }); | ||
| if (typeof mapped === 'string') { | ||
| mapped = { value: mapped }; | ||
| } else if (DNS_MAP_TYPES[answer.type] === 'TXT') { | ||
| mapped = { entries: mapped }; | ||
| } | ||
| mapped.type = DNS_MAP_TYPES[answer.type]; | ||
| return mapped; | ||
| }], | ||
| ['A', 1, (answer, req) => { | ||
| if (req.ttl) { | ||
| return { | ||
| ttl: answer.ttl, | ||
| address: unwrapBindata(answer.rdata.ipv4_address, true), | ||
| }; | ||
| } | ||
| return unwrapBindata(answer.rdata.ipv4_address); | ||
| }], | ||
| ['Aaaa', 28, (answer, req) => { | ||
| if (req.ttl) { | ||
| return { | ||
| ttl: answer.ttl, | ||
| address: unwrapBindata(answer.rdata.ipv6_address, true), | ||
| }; | ||
| } | ||
| return unwrapBindata(answer.rdata.ipv6_address); | ||
| }], | ||
| ['Caa', 257, (answer) => { | ||
| return { | ||
| critical: answer.rdata.flags, | ||
| [unwrapBindata(answer.rdata.tag)]: unwrapBindata(answer.rdata.value), | ||
| }; | ||
| }], | ||
| ['Cname', 5, (answer) => { | ||
| return answer.rdata.cname; | ||
| }], | ||
| ['Mx', 15, (answer) => { | ||
| return { | ||
| priority: answer.rdata.preference, | ||
| exchange: unwrapBindata(answer.rdata.exchange, true), | ||
| }; | ||
| }], | ||
| ['Ns', 2, (answer) => { | ||
| return unwrapBindata(answer.rdata.nsdname, true); | ||
| }], | ||
| ['Txt', 16, (answer) => { | ||
| return ArrayPrototypeMap( | ||
| answer.rdata.txt_strings, | ||
| (s) => unwrapBindata(s, true)); | ||
| }], | ||
| ['Srv', 33, (answer) => { | ||
| return { | ||
| priority: answer.rdata.priority, | ||
| weight: answer.rdata.weight, | ||
| port: answer.rdata.port, | ||
| name: unwrapBindata(answer.rdata.target), | ||
| }; | ||
| }], | ||
| ['Ptr', 12, (answer) => { | ||
| return unwrapBindata(answer.rdata.ptrdname, true); | ||
| }], | ||
| ['Naptr', 35, (answer) => { | ||
| return { | ||
| order: answer.rdata.order, | ||
| preference: answer.rdata.preference, | ||
| flags: answer.rdata.flags, | ||
| service: answer.rdata.service, | ||
| regexp: unwrapBindata(answer.rdata.regexp), | ||
| replacement: unwrapBindata(answer.rdata.replacement), | ||
| }; | ||
| }], | ||
| ['Soa', 6, (answer) => { | ||
| return { | ||
| nsname: unwrapBindata(answer.rdata.mname, true), | ||
| hostmaster: unwrapBindata(answer.rdata.rname, true), | ||
| serial: answer.rdata.serial, | ||
| refresh: answer.rdata.refresh, | ||
| retry: answer.rdata.retry, | ||
| expire: answer.rdata.expire, | ||
| minttl: answer.rdata.minimum, | ||
| }; | ||
| }], | ||
| ].forEach(({ 0: name, 1: rr, 2: mapfn }) => { | ||
| DNS_MAP_TYPES[rr] = name.toUpperCase(); | ||
| DNS_MAP_FNS[rr] = mapfn; | ||
| const bindingName = `query${name}`; | ||
| DNSWrap.prototype[bindingName] = function(req, hostname) { | ||
| this.getGeneral(hostname, rr) | ||
| .then((json) => { | ||
| const data = JSONParse(json); | ||
| let mapped; | ||
| if (name === 'Txt') { | ||
| mapped = ArrayPrototypeFilter( | ||
| ArrayPrototypeMap( | ||
| ArrayPrototypeFilter( | ||
| data.replies_tree[0].answer, | ||
| (a) => a.type === 16), | ||
| (a) => mapfn(a, req)), | ||
| (a) => a.length > 0); | ||
| } else { | ||
| mapped = ArrayPrototypeMap( | ||
| data.replies_tree[0].answer, | ||
| (a) => mapfn(a, req), | ||
| ); | ||
| } | ||
| if (name === 'Soa') { | ||
| mapped = mapped[0]; | ||
| } | ||
| return mapped; | ||
| }, (e) => { | ||
| throw dnsException(e, bindingName, name); | ||
| }) | ||
| .then((v) => { | ||
| req.oncomplete(null, v); | ||
| }, (e) => { | ||
| req.oncomplete(e); | ||
| }); | ||
| }; | ||
| }); | ||
|
|
||
| DNSWrap.prototype.getHostByAddr = function(req, address) { | ||
| this.getHostnames(address) | ||
| .then((v) => { | ||
| req.oncomplete(null, v); | ||
| }) | ||
| .catch((e) => { | ||
| req.oncomplete(dnsException(e, 'getHostByAddr', address)); | ||
| }); | ||
| }; | ||
|
|
||
| let implicitResolver; | ||
| function getImplicitResolver() { | ||
| if (!implicitResolver) { | ||
| implicitResolver = new DNSWrap(-1); | ||
| } | ||
| return implicitResolver; | ||
| } | ||
|
|
||
| function getaddrinfo(req, hostname, family, hints, verbatim) { | ||
| getImplicitResolver() | ||
| .getAddresses(hostname) | ||
| .then((json) => { | ||
| const data = JSONParse(json); | ||
| let addresses = data.just_address_answers; | ||
| if (!verbatim) { | ||
| ArrayPrototypeSort(addresses, (a, b) => { | ||
| if (a.address_type === b.address_type) { | ||
| return 0; | ||
| } | ||
| if (a.address_type === 'IPv4' && b.address_type === 'IPv6') { | ||
| return -1; | ||
| } | ||
| return 1; | ||
| }); | ||
| } | ||
| if (family !== 0) { | ||
| const type = { 4: 'IPv4', 6: 'IPv6' }[family]; | ||
| addresses = ArrayPrototypeFilter( | ||
| addresses, (a) => a.address_type === type); | ||
| } | ||
| return ArrayPrototypeMap(addresses, (a) => a.address_data); | ||
| }, (e) => { | ||
| throw dnsException(e, 'getaddrinfo', hostname); | ||
| }) | ||
| .then((v) => { | ||
| req.oncomplete(null, v); | ||
| }, (e) => { | ||
| req.oncomplete(e); | ||
| }); | ||
| } | ||
|
|
||
| module.exports = { | ||
| QueryReqWrap, | ||
| GetAddrInfoReqWrap, | ||
| GetNameInfoReqWrap, | ||
| getaddrinfo, | ||
| getnameinfo, | ||
| }; | ||
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Could the
ReqWrapitself just extend fromAsyncResource?There was a problem hiding this comment.
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it could, though that would add the AsyncResource api to the req wrap, which is returned from all the various api calls to the user.