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64ad66bc99
Co-authored-by: James M Snell <jasnell@gmail.com> PR-URL: https://github.com/nodejs/node/pull/44048 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
'use strict';
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const {
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Error,
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ObjectDefineProperties,
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ObjectGetOwnPropertyDescriptors,
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ObjectGetPrototypeOf,
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ObjectSetPrototypeOf,
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ObjectValues,
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ReflectConstruct,
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StringPrototypeSplit,
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} = primordials;
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const {
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messaging_deserialize_symbol,
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messaging_transfer_symbol,
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messaging_clone_symbol,
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messaging_transfer_list_symbol
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} = internalBinding('symbols');
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const {
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JSTransferable,
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setDeserializerCreateObjectFunction
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} = internalBinding('messaging');
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function setup() {
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// Register the handler that will be used when deserializing JS-based objects
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// from .postMessage() calls. The format of `deserializeInfo` is generally
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// 'module:Constructor', e.g. 'internal/fs/promises:FileHandle'.
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setDeserializerCreateObjectFunction((deserializeInfo) => {
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const { 0: module, 1: ctor } = StringPrototypeSplit(deserializeInfo, ':');
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const Ctor = require(module)[ctor];
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if (typeof Ctor !== 'function' ||
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typeof Ctor.prototype[messaging_deserialize_symbol] !== 'function') {
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// Not one of the official errors because one should not be able to get
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// here without messing with Node.js internals.
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// eslint-disable-next-line no-restricted-syntax
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throw new Error(`Unknown deserialize spec ${deserializeInfo}`);
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}
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return new Ctor();
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});
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}
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function makeTransferable(obj) {
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// If the object is already transferable, skip all this.
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if (obj instanceof JSTransferable) return obj;
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const inst = ReflectConstruct(JSTransferable, [], obj.constructor);
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const properties = ObjectGetOwnPropertyDescriptors(obj);
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const propertiesValues = ObjectValues(properties);
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for (let i = 0; i < propertiesValues.length; i++) {
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// We want to use null-prototype objects to not rely on globally mutable
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// %Object.prototype%.
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ObjectSetPrototypeOf(propertiesValues[i], null);
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}
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ObjectDefineProperties(inst, properties);
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ObjectSetPrototypeOf(inst, ObjectGetPrototypeOf(obj));
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return inst;
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}
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module.exports = {
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makeTransferable,
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setup,
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JSTransferable,
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kClone: messaging_clone_symbol,
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kDeserialize: messaging_deserialize_symbol,
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kTransfer: messaging_transfer_symbol,
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kTransferList: messaging_transfer_list_symbol,
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};
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