84 lines
1.6 KiB
JavaScript
84 lines
1.6 KiB
JavaScript
/*!
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* parent.js - worker processes for bcoin
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* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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const assert = require('assert');
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const EventEmitter = require('events');
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/**
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* Represents the parent process.
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* @alias module:workers.Parent
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* @constructor
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* @ignore
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*/
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function Parent() {
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if (!(this instanceof Parent))
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return new Parent();
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EventEmitter.call(this);
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this.init();
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}
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Object.setPrototypeOf(Parent.prototype, EventEmitter.prototype);
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/**
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* Initialize master (web workers).
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* @private
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*/
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Parent.prototype.init = function init() {
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global.onerror = (event) => {
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this.emit('error', new Error('Worker error.'));
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};
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global.onmessage = (event) => {
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let data;
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if (typeof event.data === 'string') {
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data = Buffer.from(event.data, 'hex');
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assert(data.length === event.data.length / 2);
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} else {
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assert(event.data && typeof event.data === 'object');
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assert(event.data.data && typeof event.data.data.length === 'number');
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data = event.data.data;
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data.__proto__ = Buffer.prototype;
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}
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this.emit('data', data);
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};
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};
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/**
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* Send data to parent process.
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* @param {Buffer} data
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* @returns {Boolean}
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*/
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Parent.prototype.write = function write(data) {
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if (global.postMessage.length === 2) {
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data.__proto__ = Uint8Array.prototype;
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global.postMessage({ data }, [data]);
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} else {
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global.postMessage(data.toString('hex'));
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}
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return true;
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};
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/**
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* Destroy the parent process.
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*/
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Parent.prototype.destroy = function destroy() {
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global.close();
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};
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/*
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* Expose
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*/
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module.exports = Parent;
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