mirror of https://github.com/seald/nedb
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.8 KiB
86 lines
2.8 KiB
/**
|
|
* Way data is stored for this database
|
|
* For a Node.js/Node Webkit database it's the file system
|
|
* For a browser-side database it's localforage, which uses the best backend available (IndexedDB then WebSQL then localStorage)
|
|
* For a react-native database, we use @react-native-async-storage/async-storage
|
|
*
|
|
* This version is the react-native version
|
|
*/
|
|
const AsyncStorage = require('@react-native-async-storage/async-storage').default
|
|
|
|
const exists = (filename, cback) => {
|
|
// eslint-disable-next-line node/handle-callback-err
|
|
AsyncStorage.getItem(filename, (err, value) => {
|
|
if (value !== null) {
|
|
return cback(true)
|
|
} else {
|
|
return cback(false)
|
|
}
|
|
})
|
|
}
|
|
|
|
const rename = (filename, newFilename, callback) => {
|
|
// eslint-disable-next-line node/handle-callback-err
|
|
AsyncStorage.getItem(filename, (err, value) => {
|
|
if (value === null) {
|
|
this.storage.removeItem(newFilename, callback)
|
|
} else {
|
|
this.storage.setItem(newFilename, value, () => {
|
|
this.storage.removeItem(filename, callback)
|
|
})
|
|
}
|
|
})
|
|
}
|
|
|
|
const writeFile = (filename, contents, options, callback) => {
|
|
// Options do not matter in a react-native setup
|
|
if (typeof options === 'function') { callback = options }
|
|
AsyncStorage.setItem(filename, contents, callback)
|
|
}
|
|
|
|
const appendFile = (filename, toAppend, options, callback) => {
|
|
// Options do not matter in a react-native setup
|
|
if (typeof options === 'function') { callback = options }
|
|
|
|
// eslint-disable-next-line node/handle-callback-err
|
|
AsyncStorage.getItem(filename, (err, contents) => {
|
|
contents = contents || ''
|
|
contents += toAppend
|
|
AsyncStorage.setItem(filename, contents, callback)
|
|
})
|
|
}
|
|
|
|
const readFile = (filename, options, callback) => {
|
|
// Options do not matter in a react-native setup
|
|
if (typeof options === 'function') { callback = options }
|
|
// eslint-disable-next-line node/handle-callback-err
|
|
AsyncStorage.getItem(filename, (err, contents) => {
|
|
return callback(null, contents || '')
|
|
})
|
|
}
|
|
|
|
const unlink = (filename, callback) => {
|
|
AsyncStorage.removeItem(filename, callback)
|
|
}
|
|
|
|
// Nothing to do, no directories will be used on react-native
|
|
const mkdir = (dir, options, callback) => callback()
|
|
|
|
// Nothing to do, no data corruption possible on react-native
|
|
const ensureDatafileIntegrity = (filename, callback) => callback(null)
|
|
|
|
const crashSafeWriteFileLines = (filename, lines, callback) => {
|
|
lines.push('') // Add final new line
|
|
writeFile(filename, lines.join('\n'), callback)
|
|
}
|
|
|
|
// Interface
|
|
module.exports.exists = exists
|
|
module.exports.rename = rename
|
|
module.exports.writeFile = writeFile
|
|
module.exports.crashSafeWriteFileLines = crashSafeWriteFileLines
|
|
module.exports.appendFile = appendFile
|
|
module.exports.readFile = readFile
|
|
module.exports.unlink = unlink
|
|
module.exports.mkdir = mkdir
|
|
module.exports.ensureDatafileIntegrity = ensureDatafileIntegrity
|
|
|