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Move file hashing to a worker thread, add
async
method (#21)
Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,56 @@ | ||
'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) | ||
.on('error', reject) | ||
.pipe(hasher) | ||
.on('error', reject) | ||
.on('finish', () => { | ||
const {buffer} = 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); | ||
} | ||
|
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const hash = hasher.digest().buffer; | ||
return {value: hash, transferList: [hash]}; | ||
} | ||
}; | ||
|
||
parentPort.on('message', async message => { | ||
try { | ||
const {method, args} = message; | ||
const handler = handlers[method]; | ||
|
||
if (handler === undefined) { | ||
throw new Error(`Unknown method '${method}'`); | ||
} | ||
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const {value, transferList} = await handler(...args); | ||
parentPort.postMessage({id: message.id, value}, transferList); | ||
} catch (error) { | ||
const newError = {message: error.message, stack: error.stack}; | ||
|
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for (const [key, value] of Object.entries(error)) { | ||
if (typeof value !== 'object') { | ||
newError[key] = value; | ||
} | ||
} | ||
|
||
parentPort.postMessage({id: message.id, error: newError}); | ||
} | ||
}); |