overleaf/services/clsi/app/js/SafeReader.js

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/* eslint-disable
no-unused-vars,
n/no-deprecated-api,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS101: Remove unnecessary use of Array.from
* DS102: Remove unnecessary code created because of implicit returns
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
let SafeReader
const fs = require('fs')
const logger = require('@overleaf/logger')
module.exports = SafeReader = {
// safely read up to size bytes from a file and return result as a
// string
readFile(file, size, encoding, callback) {
if (callback == null) {
callback = function () {}
}
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return fs.open(file, 'r', function (err, fd) {
if (err != null && err.code === 'ENOENT') {
return callback()
}
if (err != null) {
return callback(err)
}
// safely return always closing the file
const callbackWithClose = (err, ...result) =>
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fs.close(fd, function (err1) {
if (err != null) {
return callback(err)
}
if (err1 != null) {
return callback(err1)
}
return callback(null, ...Array.from(result))
})
const buff = Buffer.alloc(size) // fills with zeroes by default
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return fs.read(
fd,
buff,
0,
buff.length,
0,
function (err, bytesRead, buffer) {
if (err != null) {
return callbackWithClose(err)
}
const result = buffer.toString(encoding, 0, bytesRead)
return callbackWithClose(null, result, bytesRead)
}
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)
})
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},
}