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85 lines
2.9 KiB
85 lines
2.9 KiB
/**
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* Way data is stored for this database
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* For a Node.js/Node Webkit database it's the file system
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* For a browser-side database it's localforage, which uses the best backend available (IndexedDB then WebSQL then localStorage)
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*
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* This version is the browser version
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*/
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const localforage = require('localforage')
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// Configure localforage to display NeDB name for now. Would be a good idea to let user use his own app name
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const store = localforage.createInstance({
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name: 'NeDB',
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storeName: 'nedbdata'
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})
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const exists = (filename, cback) => {
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// eslint-disable-next-line node/handle-callback-err
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store.getItem(filename, (err, value) => {
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if (value !== null) return cback(true) // Even if value is undefined, localforage returns null
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else return cback(false)
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})
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}
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const rename = (filename, newFilename, callback) => {
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// eslint-disable-next-line node/handle-callback-err
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store.getItem(filename, (err, value) => {
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if (value === null) store.removeItem(newFilename, () => callback())
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else {
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store.setItem(newFilename, value, () => {
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store.removeItem(filename, () => callback())
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})
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}
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})
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}
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const writeFile = (filename, contents, options, callback) => {
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// Options do not matter in browser setup
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if (typeof options === 'function') { callback = options }
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store.setItem(filename, contents, () => callback())
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}
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const appendFile = (filename, toAppend, options, callback) => {
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// Options do not matter in browser setup
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if (typeof options === 'function') { callback = options }
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// eslint-disable-next-line node/handle-callback-err
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store.getItem(filename, (err, contents) => {
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contents = contents || ''
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contents += toAppend
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store.setItem(filename, contents, () => callback())
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})
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}
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const readFile = (filename, options, callback) => {
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// Options do not matter in browser setup
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if (typeof options === 'function') { callback = options }
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// eslint-disable-next-line node/handle-callback-err
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store.getItem(filename, (err, contents) => callback(null, contents || ''))
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}
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const unlink = (filename, callback) => {
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store.removeItem(filename, () => callback())
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}
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// Nothing to do, no directories will be used on the browser
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const mkdir = (dir, options, callback) => callback()
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// Nothing to do, no data corruption possible in the browser
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const ensureDatafileIntegrity = (filename, callback) => callback(null)
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const crashSafeWriteFileLines = (filename, lines, callback) => {
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lines.push('') // Add final new line
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writeFile(filename, lines.join('\n'), callback)
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}
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// Interface
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module.exports.exists = exists
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module.exports.rename = rename
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module.exports.writeFile = writeFile
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module.exports.crashSafeWriteFileLines = crashSafeWriteFileLines
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module.exports.appendFile = appendFile
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module.exports.readFile = readFile
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module.exports.unlink = unlink
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module.exports.mkdir = mkdir
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module.exports.ensureDatafileIntegrity = ensureDatafileIntegrity
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