84 lines
2.4 KiB
TypeScript
84 lines
2.4 KiB
TypeScript
"use strict";
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// TODO: use modules; export type for LocalForageDbMethods
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//import * as localforage from "localforage";
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declare var localforage;
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var Ver2xFileStore = function(storage, prefix:string) {
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var self = this;
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this.saveFile = function(name, text) {
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storage.setItem(prefix + name, text);
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}
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this.loadFile = function(name) {
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return storage.getItem(prefix + name) || storage.getItem(name);
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}
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this.getFiles = function(prefix2) {
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// iterate over files with <platform>/<dir> prefix
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var files = [];
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for (var i = 0; i < storage.length; i++) {
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var key = storage.key(i);
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if (key.startsWith(prefix + prefix2)) {
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var name = key.substring(prefix.length + prefix2.length);
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files.push(name);
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}
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}
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return files;
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}
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this.deleteFile = function(name) {
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storage.removeItem(prefix + name);
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storage.removeItem(prefix + 'local/' + name); //TODO?
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}
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}
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// copy localStorage to new driver
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function copyFromVer2xStorageFormat(platformid:string, newstore, callback:(store)=>void) {
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var alreadyMigratedKey = "__migrated_" + platformid;
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//localStorage.removeItem(alreadyMigratedKey);
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if (localStorage.getItem(alreadyMigratedKey)) {
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callback(newstore);
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return;
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}
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var oldstore = new Ver2xFileStore(localStorage, platformid + '/');
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var keys = oldstore.getFiles('');
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// no files to convert?
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if (keys.length == 0) {
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localStorage.setItem(alreadyMigratedKey, 'true');
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callback(newstore);
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return;
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}
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// convert function
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function migrateNext() {
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var key = keys.shift();
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var value = oldstore.loadFile(key);
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newstore.setItem(key, value, function(err, result) {
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if (err) {
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console.log(err);
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} else {
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console.log("Converted " + key);
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if (keys.length) {
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migrateNext();
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} else {
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newstore.length(function(err, len) {
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if (err) throw err;
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console.log("Migrated " + len + " local files to new data store");
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if (len) {
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localStorage.setItem(alreadyMigratedKey, 'true');
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callback(newstore);
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}
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});
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}
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}
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});
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}
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migrateNext(); // start the conversion
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}
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export function createNewPersistentStore(platformid:string, callback:(store)=>void) {
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var store = localforage.createInstance({
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name: "__" + platformid,
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version: 2.0
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});
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copyFromVer2xStorageFormat(platformid, store, callback);
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return store;
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}
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