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