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Merge pull request #519 from XmiliaH/resolver-api
Resolver API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
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| const fs = require('fs'); | ||
| const nmod = require('module'); | ||
| const {EventEmitter} = require('events'); | ||
| const util = require('util'); | ||
| const {VMScript} = require('./script'); | ||
| const {VM} = require('./vm'); | ||
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| const eventsModules = new WeakMap(); | ||
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| function defaultBuiltinLoaderEvents(vm) { | ||
| return eventsModules.get(vm); | ||
| } | ||
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| let cacheBufferScript; | ||
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| function defaultBuiltinLoaderBuffer(vm) { | ||
| if (!cacheBufferScript) { | ||
| cacheBufferScript = new VMScript('return buffer=>({Buffer: buffer});', {__proto__: null, filename: 'buffer.js'}); | ||
| } | ||
| const makeBuffer = vm.run(cacheBufferScript, {__proto__: null, strict: true, wrapper: 'none'}); | ||
| return makeBuffer(Buffer); | ||
| } | ||
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| let cacheUtilScript; | ||
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| function defaultBuiltinLoaderUtil(vm) { | ||
| if (!cacheUtilScript) { | ||
| cacheUtilScript = new VMScript(`return function inherits(ctor, superCtor) { | ||
| ctor.super_ = superCtor; | ||
| Object.setPrototypeOf(ctor.prototype, superCtor.prototype); | ||
| }`, {__proto__: null, filename: 'util.js'}); | ||
| } | ||
| const inherits = vm.run(cacheUtilScript, {__proto__: null, strict: true, wrapper: 'none'}); | ||
| const copy = Object.assign({}, util); | ||
| copy.inherits = inherits; | ||
| return vm.readonly(copy); | ||
| } | ||
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| const BUILTIN_MODULES = (nmod.builtinModules || Object.getOwnPropertyNames(process.binding('natives'))).filter(s=>!s.startsWith('internal/')); | ||
|
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| let EventEmitterReferencingAsyncResourceClass = null; | ||
| if (EventEmitter.EventEmitterAsyncResource) { | ||
| // eslint-disable-next-line global-require | ||
| const {AsyncResource} = require('async_hooks'); | ||
| const kEventEmitter = Symbol('kEventEmitter'); | ||
| class EventEmitterReferencingAsyncResource extends AsyncResource { | ||
| constructor(ee, type, options) { | ||
| super(type, options); | ||
| this[kEventEmitter] = ee; | ||
| } | ||
| get eventEmitter() { | ||
| return this[kEventEmitter]; | ||
| } | ||
| } | ||
| EventEmitterReferencingAsyncResourceClass = EventEmitterReferencingAsyncResource; | ||
| } | ||
|
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| let cacheEventsScript; | ||
|
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| const SPECIAL_MODULES = { | ||
| events: { | ||
| init(vm) { | ||
| if (!cacheEventsScript) { | ||
| const eventsSource = fs.readFileSync(`${__dirname}/events.js`, 'utf8'); | ||
| cacheEventsScript = new VMScript(`(function (fromhost) { const module = {}; module.exports={};{ ${eventsSource} | ||
| } return module.exports;})`, {filename: 'events.js'}); | ||
| } | ||
| const closure = VM.prototype.run.call(vm, cacheEventsScript); | ||
| const eventsInstance = closure(vm.readonly({ | ||
| kErrorMonitor: EventEmitter.errorMonitor, | ||
| once: EventEmitter.once, | ||
| on: EventEmitter.on, | ||
| getEventListeners: EventEmitter.getEventListeners, | ||
| EventEmitterReferencingAsyncResource: EventEmitterReferencingAsyncResourceClass | ||
| })); | ||
| eventsModules.set(vm, eventsInstance); | ||
| vm._addProtoMapping(EventEmitter.prototype, eventsInstance.EventEmitter.prototype); | ||
| }, | ||
| load: defaultBuiltinLoaderEvents | ||
| }, | ||
| buffer: defaultBuiltinLoaderBuffer, | ||
| util: defaultBuiltinLoaderUtil | ||
| }; | ||
|
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| function addDefaultBuiltin(builtins, key, hostRequire) { | ||
| if (builtins.has(key)) return; | ||
| const special = SPECIAL_MODULES[key]; | ||
| builtins.set(key, special ? special : vm => vm.readonly(hostRequire(key))); | ||
| } | ||
|
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|
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| function makeBuiltinsFromLegacyOptions(builtins, hostRequire, mocks, overrides) { | ||
| const res = new Map(); | ||
| if (mocks) { | ||
| const keys = Object.getOwnPropertyNames(mocks); | ||
| for (let i = 0; i < keys.length; i++) { | ||
| const key = keys[i]; | ||
| res.set(key, (tvm) => tvm.readonly(mocks[key])); | ||
| } | ||
| } | ||
| if (overrides) { | ||
| const keys = Object.getOwnPropertyNames(overrides); | ||
| for (let i = 0; i < keys.length; i++) { | ||
| const key = keys[i]; | ||
| res.set(key, overrides[key]); | ||
| } | ||
| } | ||
| if (Array.isArray(builtins)) { | ||
| const def = builtins.indexOf('*') >= 0; | ||
| if (def) { | ||
| for (let i = 0; i < BUILTIN_MODULES.length; i++) { | ||
| const name = BUILTIN_MODULES[i]; | ||
| if (builtins.indexOf(`-${name}`) === -1) { | ||
| addDefaultBuiltin(res, name, hostRequire); | ||
| } | ||
| } | ||
| } else { | ||
| for (let i = 0; i < BUILTIN_MODULES.length; i++) { | ||
| const name = BUILTIN_MODULES[i]; | ||
| if (builtins.indexOf(name) !== -1) { | ||
| addDefaultBuiltin(res, name, hostRequire); | ||
| } | ||
| } | ||
| } | ||
| } else if (builtins) { | ||
| for (let i = 0; i < BUILTIN_MODULES.length; i++) { | ||
| const name = BUILTIN_MODULES[i]; | ||
| if (builtins[name]) { | ||
| addDefaultBuiltin(res, name, hostRequire); | ||
| } | ||
| } | ||
| } | ||
| return res; | ||
| } | ||
|
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| function makeBuiltins(builtins, hostRequire) { | ||
| const res = new Map(); | ||
| for (let i = 0; i < builtins.length; i++) { | ||
| const name = builtins[i]; | ||
| addDefaultBuiltin(res, name, hostRequire); | ||
| } | ||
| return res; | ||
| } | ||
|
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| exports.makeBuiltinsFromLegacyOptions = makeBuiltinsFromLegacyOptions; | ||
| exports.makeBuiltins = makeBuiltins; |
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