Merge pull request #104 from BeaudanBrown/pow-refactor
Refactor PoW calculation to use webworkers Fixes #100pull/107/head
sachaaaaa
6 years ago
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GitHub
commit
76cdf61ef9
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/* global Worker, window, setTimeout */
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const WORKER_TIMEOUT = 60 * 1000; // one minute
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class TimedOutError extends Error {
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constructor(message) {
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super(message);
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this.name = this.constructor.name;
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if (typeof Error.captureStackTrace === 'function') {
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Error.captureStackTrace(this, this.constructor);
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} else {
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this.stack = (new Error(message)).stack;
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}
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}
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}
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class WorkerInterface {
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constructor(path) {
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this._utilWorker = new Worker(path);
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this._jobs = Object.create(null);
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this._DEBUG = false;
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this._jobCounter = 0;
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this._utilWorker.onmessage = e => {
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const [jobId, errorForDisplay, result] = e.data;
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const job = this._getJob(jobId);
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if (!job) {
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throw new Error(
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`Received worker reply to job ${jobId}, but did not have it in our registry!`
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);
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}
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const { resolve, reject, fnName } = job;
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if (errorForDisplay) {
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return reject(
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new Error(
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`Error received from worker job ${jobId} (${fnName}): ${errorForDisplay}`
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)
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);
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}
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return resolve(result);
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};
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}
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_makeJob (fnName) {
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this._jobCounter += 1;
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const id = this._jobCounter;
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if (this._DEBUG) {
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window.log.info(`Worker job ${id} (${fnName}) started`);
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}
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this._jobs[id] = {
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fnName,
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start: Date.now(),
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};
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return id;
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};
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_updateJob(id, data) {
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const { resolve, reject } = data;
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const { fnName, start } = this._jobs[id];
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this._jobs[id] = {
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...this._jobs[id],
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...data,
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resolve: value => {
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this._removeJob(id);
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const end = Date.now();
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window.log.info(
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`Worker job ${id} (${fnName}) succeeded in ${end - start}ms`
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);
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return resolve(value);
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},
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reject: error => {
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this._removeJob(id);
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const end = Date.now();
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window.log.info(
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`Worker job ${id} (${fnName}) failed in ${end - start}ms`
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);
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return reject(error);
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},
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};
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};
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_removeJob(id) {
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if (this._DEBUG) {
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this._jobs[id].complete = true;
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} else {
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delete this._jobs[id];
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}
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}
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_getJob(id) {
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return this._jobs[id];
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};
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callWorker(fnName, ...args) {
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const jobId = this._makeJob(fnName);
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return new Promise((resolve, reject) => {
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this._utilWorker.postMessage([jobId, fnName, ...args]);
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this._updateJob(jobId, {
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resolve,
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reject,
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args: this._DEBUG ? args : null,
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});
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setTimeout(
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() => reject(new TimedOutError(`Worker job ${jobId} (${fnName}) timed out`)),
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WORKER_TIMEOUT
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);
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});
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};
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}
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module.exports = {
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WorkerInterface,
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TimedOutError,
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};
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