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Original file line number | Diff line number | Diff line change |
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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={};{ ${eventsSource} | ||
} return module.exports;})`, {filename: 'events.js'}); | ||
} | ||
const closure = VM.prototype.run.call(vm, cacheEventsScript); | ||
const eventsInstance = closure(vm.readonly({ | ||
kErrorMonitor: EventEmitter.errorMonitor, | ||
once: EventEmitter.once, | ||
on: EventEmitter.on, | ||
getEventListeners: EventEmitter.getEventListeners, | ||
EventEmitterReferencingAsyncResource: EventEmitterReferencingAsyncResourceClass | ||
})); | ||
eventsModules.set(vm, eventsInstance); | ||
vm._addProtoMapping(EventEmitter.prototype, eventsInstance.EventEmitter.prototype); | ||
}, | ||
load: defaultBuiltinLoaderEvents | ||
}, | ||
buffer: defaultBuiltinLoaderBuffer, | ||
util: defaultBuiltinLoaderUtil | ||
}; | ||
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function addDefaultBuiltin(builtins, key, hostRequire) { | ||
if (builtins.has(key)) return; | ||
const special = SPECIAL_MODULES[key]; | ||
builtins.set(key, special ? special : vm => vm.readonly(hostRequire(key))); | ||
} | ||
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function makeBuiltinsFromLegacyOptions(builtins, hostRequire, mocks, overrides) { | ||
const res = new Map(); | ||
if (mocks) { | ||
const keys = Object.getOwnPropertyNames(mocks); | ||
for (let i = 0; i < keys.length; i++) { | ||
const key = keys[i]; | ||
res.set(key, (tvm) => tvm.readonly(mocks[key])); | ||
} | ||
} | ||
if (overrides) { | ||
const keys = Object.getOwnPropertyNames(overrides); | ||
for (let i = 0; i < keys.length; i++) { | ||
const key = keys[i]; | ||
res.set(key, overrides[key]); | ||
} | ||
} | ||
if (Array.isArray(builtins)) { | ||
const def = builtins.indexOf('*') >= 0; | ||
if (def) { | ||
for (let i = 0; i < BUILTIN_MODULES.length; i++) { | ||
const name = BUILTIN_MODULES[i]; | ||
if (builtins.indexOf(`-${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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