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95 lines
2.8 KiB
95 lines
2.8 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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var 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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localforage.config({
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name: 'NeDB'
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, storeName: 'nedbdata'
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});
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function exists (filename, callback) {
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localforage.getItem(filename, function (err, value) {
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if (value !== null) { // Even if value is undefined, localforage returns null
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return callback(true);
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} else {
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return callback(false);
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}
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});
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}
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function rename (filename, newFilename, callback) {
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localforage.getItem(filename, function (err, value) {
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if (value === null) {
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localforage.removeItem(newFilename, function () { return callback(); });
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} else {
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localforage.setItem(newFilename, value, function () {
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localforage.removeItem(filename, function () { return callback(); });
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});
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}
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});
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}
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function 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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localforage.setItem(filename, contents, function () { return callback(); });
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}
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function 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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localforage.getItem(filename, function (err, contents) {
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contents = contents || '';
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contents += toAppend;
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localforage.setItem(filename, contents, function () { return callback(); });
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});
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}
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function 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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localforage.getItem(filename, function (err, contents) { return callback(null, contents || ''); });
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}
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function unlink (filename, callback) {
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localforage.removeItem(filename, function () { return callback(); });
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}
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// Nothing to do, no directories will be used on the browser
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function mkdirp (dir, callback) {
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return callback();
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}
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// Nothing to do, no data corruption possible in the brower
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function ensureDatafileIntegrity (filename, callback) {
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return callback(null);
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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.crashSafeWriteFile = writeFile; // No need for a crash safe function in the browser
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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.mkdirp = mkdirp;
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module.exports.ensureDatafileIntegrity = ensureDatafileIntegrity;
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