58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
'use strict';
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const fs = require('fs');
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const crypto = require('crypto');
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const {parentPort} = require('worker_threads');
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const handlers = {
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hashFile: (algorithm, filePath) => new Promise((resolve, reject) => {
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const hasher = crypto.createHash(algorithm);
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fs.createReadStream(filePath)
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// TODO: Use `Stream.pipeline` when targeting Node.js 12.
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.on('error', reject)
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.pipe(hasher)
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.on('error', reject)
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.on('finish', () => {
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const {buffer} = new Uint8Array(hasher.read());
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resolve({value: buffer, transferList: [buffer]});
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});
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}),
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hash: async (algorithm, input) => {
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const hasher = crypto.createHash(algorithm);
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if (Array.isArray(input)) {
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for (const part of input) {
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hasher.update(part);
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}
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} else {
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hasher.update(input);
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}
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const {buffer} = new Uint8Array(hasher.digest());
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return {value: buffer, transferList: [buffer]};
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}
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};
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parentPort.on('message', async message => {
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try {
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const {method, args} = message;
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const handler = handlers[method];
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if (handler === undefined) {
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throw new Error(`Unknown method '${method}'`);
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}
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const {value, transferList} = await handler(...args);
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parentPort.postMessage({id: message.id, value}, transferList);
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} catch (error) {
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const newError = {message: error.message, stack: error.stack};
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for (const [key, value] of Object.entries(error)) {
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if (typeof value !== 'object') {
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newError[key] = value;
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}
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}
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parentPort.postMessage({id: message.id, error: newError});
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}
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});
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