add missing src2/data
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Stewart Allen
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7f75981689
commit
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2 changed files with 374 additions and 0 deletions
325
src2/data/index.js
Normal file
325
src2/data/index.js
Normal file
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/** Copyright Stewart Allen -- All Rights Reserved */
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// Create global data object if it doesn't exist
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if (!self.data) {
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self.data = {};
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}
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const { data } = self;
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data.Index = IDBStore;
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data.open = function() {
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return new IDBStore(...arguments);
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};
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// https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
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let IDB, IRR, local = null;
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try {
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IDB = self.indexedDB || self.mozIndexedDB || self.webkitIndexedDB || self.msIndexedDB;
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IRR = self.IDBKeyRange;
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} catch (e) {
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console.log("IndexedDB disabled: application may not function properly");
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}
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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 IDBStore(dbname, options = {}) {
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this.db = null;
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this.name = dbname;
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this.stores = options.stores || [ dbname ];
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this.version = options.version || 1;
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this.queue = [];
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this.idle = [];
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this.initCalled = false;
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this.created = {};
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}
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IDBStore.delete = function(dbname) {
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IDB.deleteDatabase(dbname);
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};
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let SP = IDBStore.prototype;
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/** ******************************************************************
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* indexedDB implementation
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******************************************************************* */
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SP.onIdle = function(fn) {
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if (this.queue.length) {
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this.idle.push(fn);
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} else {
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fn();
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}
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return this;
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};
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SP.promise = function(store) {
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let db = this;
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let pc = {
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iterate: (opt = {}) => new Promise(function(resolve, reject) {
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let { lower, upper, collect } = opt;
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if (!collect) {
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let rval = opt.map ? {} : [];
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collect = (key, value) => {
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if (key !== null) {
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if (opt.map) {
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rval[key] = value;
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} else {
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rval.push({key, value});
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}
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} else {
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resolve(rval);
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}
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};
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} else {
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resolve();
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}
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db.iterate(collect, lower, upper, true, store);
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}),
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get: (key) => new Promise(function(resolve, reject) {
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db.get(key, resolve, store);
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}),
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put: (key, value) => new Promise(function(resolve, reject) {
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db.put(key, value, resolve, store);
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}),
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remove: (key) => new Promise(function(resolve, reject) {
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db.remove(key, resolve, store);
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}),
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// wait for all outstanding transactions to complete
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wait: () => new Promise(function(resolve, reject) {
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db.onIdle(promise);
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}),
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use: (store) => {
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db.use(store);
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return pc;
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},
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};
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return pc;
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}
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SP.keys = function(callback, lower, upper, store = this.current) {
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if (!this.db) {
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this.init();
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return this.queue.push(["keys", callback, lower, upper, store]);
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}
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let out = [];
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this.iterate(function(k,v) {
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if (k === null) {
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callback(out);
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} else {
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out.push(k);
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}
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}, lower, upper, true, store);
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};
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SP.iterate = function(callback, lower, upper, nullterm, store = this.current) {
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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, nullterm, store]);
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}
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let 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
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.transaction(store)
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.objectStore(store)
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.openCursor(range).onsuccess = function(event) {
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let 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.use = function(store) {
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this.current = store;
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return this;
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}
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SP.init = function(options = {}) {
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if (this.initCalled) return;
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let 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(`IndexedDB disabled: unable to initialize '${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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let db = storage.db = request.result;
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let current = [...db.objectStoreNames];
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let stores = storage.stores;
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// add missing stores
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for (let store of stores) {
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if (current.indexOf(store) >= 0) {
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continue;
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}
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storage.created[store] = db.createObjectStore(store);
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storage.current = store;
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current.push(store);
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console.log({index_added: store});
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}
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// remove obsolete stores
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for (let curr of current) {
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if (stores.indexOf(curr) < 0) {
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storage.db.deleteObjectStore(curr);
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console.log({index_dropped: curr});
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}
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}
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event.target.transaction.oncomplete = function(event) {
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storage.runQueue();
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};
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};
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request.onsuccess = function(event) {
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storage.current = storage.stores[0];
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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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let 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.shift()) {
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case 'iterate': this.iterate(...e); break;
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case 'keys': this.keys(...e); break;
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case 'put': this.put(...e); break;
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case 'get': this.get(...e); break;
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case 'remove': this.remove(...e); break;
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case 'clear': this.clear(...e);
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}
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}
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this.queue = [];
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}
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while (this.idle.length) {
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this.idle.shift()();
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}
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};
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SP.put = function(key, value, callback, store = this.current) {
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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, store]);
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}
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try {
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let req = this.db
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.transaction(store, "readwrite")
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.objectStore(store).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, store = this.current) {
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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, store]);
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}
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try {
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let req = this.db
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.transaction(store)
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.objectStore(store).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, store = this.current) {
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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, store]);
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}
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try {
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let req = this.db
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.transaction(store, "readwrite")
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.objectStore(store).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, store = this.current) {
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if (!this.db) {
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this.init();
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return this.queue.push(['clear', store]);
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}
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this.db
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.transaction(store, "readwrite")
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.objectStore(store).clear();
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};
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// Export for ES modules
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export { IDBStore as Index };
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export const open = data.open;
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49
src2/data/local.js
Normal file
49
src2/data/local.js
Normal file
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@ -0,0 +1,49 @@
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/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
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// Create global data object if it doesn't exist
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if (!self.data) {
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self.data = {};
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}
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const { data } = self;
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function Local() {
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this.__data__ = {};
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this.__mem__ = true;
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}
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var LS = Local.prototype;
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LS.getItem = function(key) {
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return this[key];
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};
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LS.setItem = function(key, val) {
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this.__data__[key] = val;
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this[key] = val;
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};
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LS.removeItem = function(key) {
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delete this.__data__[key];
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};
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LS.clear = function() {
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this.__data__ = {};
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};
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try {
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// deprecate 'Local' at some point
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let local = data.local = self.localStorage;
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let testkey = '__test';
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local.setItem(testkey, 1);
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local.getItem(testkey);
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local.removeItem(testkey);
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} catch (e) {
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data.local = new Local();
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let msg = "localStorage disabled: application may not function properly";
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console.log(msg);
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// alert(msg);
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}
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// Export for ES modules
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export const local = data.local;
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