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builtin.js
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builtin.js
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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');
const eventsModules = new WeakMap();
function defaultBuiltinLoaderEvents(vm) {
return eventsModules.get(vm);
}
let cacheBufferScript;
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);
}
let cacheUtilScript;
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);
}
const BUILTIN_MODULES = (nmod.builtinModules || Object.getOwnPropertyNames(process.binding('natives'))).filter(s=>!s.startsWith('internal/'));
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;
}
let cacheEventsScript;
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={};{ ${eventsSource}
} return module.exports;})`, {filename: 'events.js'});
}
const closure = VM.prototype.run.call(vm, cacheEventsScript);
const eventsInstance = closure(vm.readonly({
kErrorMonitor: EventEmitter.errorMonitor,
once: EventEmitter.once,
on: EventEmitter.on,
getEventListeners: EventEmitter.getEventListeners,
EventEmitterReferencingAsyncResource: EventEmitterReferencingAsyncResourceClass
}));
eventsModules.set(vm, eventsInstance);
vm._addProtoMapping(EventEmitter.prototype, eventsInstance.EventEmitter.prototype);
},
load: defaultBuiltinLoaderEvents
},
buffer: defaultBuiltinLoaderBuffer,
util: defaultBuiltinLoaderUtil
};
function addDefaultBuiltin(builtins, key, hostRequire) {
if (builtins.has(key)) return;
const special = SPECIAL_MODULES[key];
builtins.set(key, special ? special : vm => vm.readonly(hostRequire(key)));
}
function makeBuiltinsFromLegacyOptions(builtins, hostRequire, mocks, overrides) {
const res = new Map();
if (mocks) {
const keys = Object.getOwnPropertyNames(mocks);
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
res.set(key, (tvm) => tvm.readonly(mocks[key]));
}
}
if (overrides) {
const keys = Object.getOwnPropertyNames(overrides);
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
res.set(key, overrides[key]);
}
}
if (Array.isArray(builtins)) {
const def = builtins.indexOf('*') >= 0;
if (def) {
for (let i = 0; i < BUILTIN_MODULES.length; i++) {
const name = BUILTIN_MODULES[i];
if (builtins.indexOf(`-${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;
}
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;
}
exports.makeBuiltinsFromLegacyOptions = makeBuiltinsFromLegacyOptions;
exports.makeBuiltins = makeBuiltins;