audiobookshelf/server/libs/libarchive/libarchiveWorker.js

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/**
* Modified from https://github.com/nika-begiashvili/libarchivejs
*/
const { parentPort } = require('worker_threads')
const { getArchiveReader } = require('./wasm-module')
let reader = null
let busy = false
getArchiveReader((_reader) => {
reader = _reader
busy = false
parentPort.postMessage({ type: 'READY' })
})
parentPort.on('message', async msg => {
if (busy) {
parentPort.postMessage({ type: 'BUSY' })
return
}
let skipExtraction = false
busy = true
try {
switch (msg.type) {
case 'HELLO': // module will respond READY when it's ready
break
case 'OPEN':
await reader.open(msg.file)
parentPort.postMessage({ type: 'OPENED' })
break
case 'LIST_FILES':
skipExtraction = true
// eslint-disable-next-line no-fallthrough
case 'EXTRACT_FILES':
for (const entry of reader.entries(skipExtraction)) {
parentPort.postMessage({ type: 'ENTRY', entry })
}
parentPort.postMessage({ type: 'END' })
break
case 'EXTRACT_SINGLE_FILE':
for (const entry of reader.entries(true, msg.target)) {
if (entry.fileData) {
parentPort.postMessage({ type: 'FILE', entry })
}
}
break
case 'CHECK_ENCRYPTION':
parentPort.postMessage({ type: 'ENCRYPTION_STATUS', status: reader.hasEncryptedData() })
break
case 'SET_PASSPHRASE':
reader.setPassphrase(msg.passphrase)
parentPort.postMessage({ type: 'PASSPHRASE_STATUS', status: true })
break
default:
throw new Error('Invalid Command')
}
} catch (err) {
parentPort.postMessage({
type: 'ERROR',
error: {
message: err.message,
name: err.name,
stack: err.stack
}
})
} finally {
// eslint-disable-next-line require-atomic-updates
busy = false
}
})