mirror of
https://github.com/moparisthebest/mail
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332 lines
9.5 KiB
JavaScript
332 lines
9.5 KiB
JavaScript
/**
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* indexed db adapter
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* ===
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* - originally authored by Vivian Li
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*
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*/
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Lawnchair.adapter('indexed-db', (function(){
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// update the STORE_VERSION when the schema used by this adapter changes
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// (for example, if you change the STORE_NAME above)
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// NB: Causes onupgradeneeded to be fired, which erases the old database!
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var STORE_VERSION = 3;
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var getIDB = function() {
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return window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.oIndexedDB || window.msIndexedDB;
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};
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var getIDBTransaction = function() {
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return window.IDBTransaction || window.webkitIDBTransaction || window.mozIDBTransaction || window.oIDBTransaction || window.msIDBTransaction;
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};
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var getIDBKeyRange = function() {
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return window.IDBKeyRange || window.webkitIDBKeyRange || window.mozIDBKeyRange || window.oIDBKeyRange || window.msIDBKeyRange;
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};
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// see https://groups.google.com/a/chromium.org/forum/?fromgroups#!topic/chromium-html5/OhsoAQLj7kc
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var READ_WRITE = (getIDBTransaction() && 'READ_WRITE' in getIDBTransaction()) ? getIDBTransaction().READ_WRITE : 'readwrite';
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return {
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valid: function() {
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return !!getIDB();
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},
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init: function(options, callback) {
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var self = this;
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var cb = self.fn(self.name, callback);
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if (cb && typeof cb !== 'function') {
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throw 'callback not valid';
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}
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// queues pending operations
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self.waiting = [];
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// open idb
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self.idb = getIDB();
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var request = self.idb.open(self.name, STORE_VERSION);
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// attach callback handlers
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request.onerror = fail;
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request.onupgradeneeded = onupgradeneeded;
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request.onsuccess = onsuccess;
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// first start or indexeddb needs a version upgrade
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function onupgradeneeded() {
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self.db = request.result;
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self.transaction = request.transaction;
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// NB! in case of a version conflict, we don't try to migrate,
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// instead just throw away the old store and create a new one.
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// this happens if somebody changed the
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try {
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self.db.deleteObjectStore(self.record);
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} catch (e) { /* ignore */ }
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// create object store.
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self.db.createObjectStore(self.record, {
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autoIncrement: useAutoIncrement()
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});
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}
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// database is ready for use
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function onsuccess(event) {
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// remember the db instance
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self.db = event.target.result;
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// storage is now possible
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self.store = true;
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// execute all pending operations
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while (self.waiting.length) {
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self.waiting.shift().call(self);
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}
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// we're done, fire the callback
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if (cb) {
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cb.call(self, self);
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}
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}
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},
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save:function(obj, callback) {
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var self = this;
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if(!this.store) {
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this.waiting.push(function() {
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this.save(obj, callback);
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});
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return;
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}
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var objs = (this.isArray(obj) ? obj : [obj]).map(function(o){if(!o.key) { o.key = self.uuid()} return o})
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var win = function (e) {
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if (callback) { self.lambda(callback).call(self, self.isArray(obj) ? objs : objs[0] ) }
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};
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var trans = this.db.transaction(this.record, READ_WRITE);
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var store = trans.objectStore(this.record);
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for (var i = 0; i < objs.length; i++) {
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var o = objs[i];
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store.put(o, o.key);
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}
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store.transaction.oncomplete = win;
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store.transaction.onabort = fail;
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return this;
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},
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batch: function (objs, callback) {
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return this.save(objs, callback);
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},
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get:function(key, callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.get(key, callback);
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});
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return;
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}
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var self = this;
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var win = function (e) {
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var r = e.target.result;
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if (callback) {
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if (r) { r.key = key; }
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self.lambda(callback).call(self, r);
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}
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};
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if (!this.isArray(key)){
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var req = this.db.transaction(this.record).objectStore(this.record).get(key);
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req.onsuccess = function(event) {
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req.onsuccess = req.onerror = null;
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win(event);
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};
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req.onerror = function(event) {
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req.onsuccess = req.onerror = null;
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fail(event);
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};
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} else {
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// note: these are hosted.
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var results = []
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, done = key.length
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, keys = key
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var getOne = function(i) {
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self.get(keys[i], function(obj) {
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results[i] = obj;
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if ((--done) > 0) { return; }
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if (callback) {
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self.lambda(callback).call(self, results);
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}
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});
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};
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for (var i = 0, l = keys.length; i < l; i++)
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getOne(i);
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}
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return this;
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},
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exists:function(key, callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.exists(key, callback);
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});
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return;
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}
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var self = this;
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var req = this.db.transaction(self.record).objectStore(this.record).openCursor(getIDBKeyRange().only(key));
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req.onsuccess = function(event) {
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req.onsuccess = req.onerror = null;
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// exists iff req.result is not null
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// XXX but firefox returns undefined instead, sigh XXX
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var undef;
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self.lambda(callback).call(self, event.target.result !== null &&
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event.target.result !== undef);
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};
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req.onerror = function(event) {
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req.onsuccess = req.onerror = null;
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fail(event);
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};
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return this;
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},
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all:function(callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.all(callback);
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});
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return;
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}
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var cb = this.fn(this.name, callback) || undefined;
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var self = this;
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var objectStore = this.db.transaction(this.record).objectStore(this.record);
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var toReturn = [];
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objectStore.openCursor().onsuccess = function(event) {
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var cursor = event.target.result;
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if (cursor) {
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toReturn.push(cursor.value);
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cursor['continue']();
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}
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else {
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if (cb) cb.call(self, toReturn);
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}
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};
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return this;
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},
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keys:function(callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.keys(callback);
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});
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return;
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}
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var cb = this.fn(this.name, callback) || undefined;
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var self = this;
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var objectStore = this.db.transaction(this.record).objectStore(this.record);
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var toReturn = [];
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// in theory we could use openKeyCursor() here, but no one actually
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// supports it yet.
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objectStore.openCursor().onsuccess = function(event) {
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var cursor = event.target.result;
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if (cursor) {
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toReturn.push(cursor.key);
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cursor['continue']();
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}
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else {
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if (cb) cb.call(self, toReturn);
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}
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};
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return this;
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},
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remove:function(keyOrArray, callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.remove(keyOrArray, callback);
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});
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return;
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}
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var self = this;
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var toDelete = keyOrArray;
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if (!this.isArray(keyOrArray)) {
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toDelete=[keyOrArray];
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}
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var win = function () {
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if (callback) self.lambda(callback).call(self)
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};
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var os = this.db.transaction(this.record, READ_WRITE).objectStore(this.record);
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var key = keyOrArray.key ? keyOrArray.key : keyOrArray;
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for (var i = 0; i < toDelete.length; i++) {
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var key = toDelete[i].key ? toDelete[i].key : toDelete[i];
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os['delete'](key);
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};
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os.transaction.oncomplete = win;
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os.transaction.onabort = fail;
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return this;
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},
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nuke:function(callback) {
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if(!this.store) {
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this.waiting.push(function() {
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this.nuke(callback);
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});
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return;
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}
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var self = this
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, win = callback ? function() { self.lambda(callback).call(self) } : function(){};
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try {
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var os = this.db.transaction(this.record, READ_WRITE).objectStore(this.record);
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os.clear();
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os.transaction.oncomplete = win;
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os.transaction.onabort = fail;
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} catch (e) {
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if (e.name=='NotFoundError')
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win()
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else
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fail(e);
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}
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return this;
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}
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};
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//
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// Helper functions
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//
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function fail(e, i) {
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console.error('error in indexed-db adapter!', e, i);
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}
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function useAutoIncrement() {
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// using preliminary mozilla implementation which doesn't support
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// auto-generated keys. Neither do some webkit implementations.
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return !!window.indexedDB;
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}
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})());
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