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Stewart Allen
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211
js/moto-db.js
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211
js/moto-db.js
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"use strict";
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var gs_moto_db = {
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copyright:"stewart allen <stewart@neuron.com> -- all rights reserved"
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};
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(function() {
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if (!self.moto) self.moto = {};
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if (self.moto.Storage) return;
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self.moto.Storage = Storage;
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// https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
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var IDB = self.indexedDB || self.mozIndexedDB || self.webkitIndexedDB || self.msIndexedDB,
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IRR = self.IDBKeyRange,
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local = null;
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/**
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* @param {String} dbname
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* @param {number} [version]
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* @constructor
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*/
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function Storage(dbname, version) {
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this.db = null;
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this.name = dbname;
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this.version = version || 1;
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this.queue = [];
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this.initCalled = false;
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}
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Storage.delete = function(dbname) {
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IDB.deleteDatabase(dbname);
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};
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var SP = Storage.prototype;
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/** ******************************************************************
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* indexedDB implementation
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******************************************************************* */
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SP.keys = function(callback, lower, upper) {
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var out = [];
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this.iterate(function(k,v) {
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if (k) out.push(k);
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}, lower, upper, true);
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callback(out);
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};
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SP.iterate = function(callback, lower, upper, nullterm) {
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if (!this.db) {
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this.init();
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return this.queue.push(["iterate", callback, lower, upper]);
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}
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var range = lower && upper ? IRR.bound(lower,upper) :
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lower ? IRR.lowerBound(lower) :
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upper ? IRR.upperBound(upper) : undefined;
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// iterate over all db values for debugging
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this.db.transaction(this.name).objectStore(this.name).openCursor(range).onsuccess = function(event) {
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var cursor = event.target.result;
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if (cursor) {
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callback(cursor.key,cursor.value);
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cursor.continue();
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} else if (nullterm) {
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callback(null);
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}
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};
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};
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SP.deleteStore = function() {
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if (this.initCalled) throw "cannot delete ObjectStore after init() called";
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this.version = Number.MAX_SAFE_INTEGER || Number.MAX_VALUE;
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return this.init(true);
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};
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SP.init = function(deleteOS) {
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if (this.initCalled) return;
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var storage = this,
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name = this.name,
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request = null;
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function fallback() {
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console.log("in private browsing mode or browser lacks support for IndexedDB. unable to setup storage for '" + name + "'.");
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local = {};
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storage.runQueue();
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}
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try {
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request = IDB.open(name, this.version);
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request.onupgradeneeded = function(event) {
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if (deleteOS) {
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storage.db.deleteObjectStore(name);
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return;
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}
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storage.db = request.result;
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storage.store = storage.db.createObjectStore(name);
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setTimeout(function() { storage.runQueue() });
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};
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request.onsuccess = function(event) {
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storage.db = request.result;
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storage.runQueue();
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};
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request.onerror = function(event) {
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console.log({error:event});
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fallback();
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};
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} catch (e) {
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fallback();
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return;
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}
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this.initCalled = true;
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return this;
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};
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SP.runQueue = function() {
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if (this.queue.length > 0) {
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var i = 0, q = this.queue, e;
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while (i < q.length) {
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e = q[i++];
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switch (e[0]) {
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case 'iterate': this.iterate(e[1], e[2], e[3]); break;
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case 'put': this.put(e[1], e[2], e[3]); break;
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case 'get': this.get(e[1], e[2]); break;
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case 'remove': this.remove(e[1], e[2]); break;
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case 'clear': this.clear();
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}
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}
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this.queue = [];
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}
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};
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SP.put = function(key, value, callback) {
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if (local) {
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local[key] = value;
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if (callback) callback(true);
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return;
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}
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if (!this.db) {
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this.init();
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return this.queue.push(['put', key, value, callback]);
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}
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try {
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var req = this.db.transaction(this.name, "readwrite").objectStore(this.name).put(value, key);
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if (callback) {
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req.onsuccess = function(event) { callback(true) };
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req.onerror = function(event) { callback(false) };
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}
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} catch (e) {
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console.log(e);
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if (callback) callback(false);
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}
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};
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SP.get = function(key, callback) {
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if (local) {
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if (callback) callback(local[key]);
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return;
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}
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if (!this.db) {
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this.init();
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return this.queue.push(['get', key, callback]);
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}
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try {
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var req = this.db.transaction(this.name).objectStore(this.name).get(key);
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if (callback) {
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req.onsuccess = function(event) { callback(req.result) };
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req.onerror = function(event) { callback(null) };
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}
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} catch (e) {
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console.log(e);
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if (callback) callback(null);
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}
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};
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SP.remove = function(key, callback) {
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if (local) {
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delete local[key];
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if (callback) callback(true);
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return;
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}
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if (!this.db) {
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this.init();
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return this.queue.push(['remove', key, callback]);
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}
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try {
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var req = this.db.transaction(this.name, "readwrite").objectStore(this.name).delete(key);
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if (callback) {
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req.onsuccess = function(event) { callback(true) };
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req.onerror = function(event) { callback(false) };
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}
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} catch (e) {
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console.log(e);
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if (callback) callback(false);
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}
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};
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SP.clear = function(key) {
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if (!this.db) {
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this.init();
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return this.queue.push(['clear']);
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}
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this.db.transaction(this.name, "readwrite").objectStore(this.name).clear();
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};
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})();
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