offline storage

fpjs/render/storage_filesystem.js

@@ -0,0 +1,151 @@
+FP.storage = FP.storage || {}
+
+FP.storage.filesystem = function() {
+	var _urls = {},
+		_queue = new FP.Queue("fpjs/render/loader_filesystem.js", 6),
+		_requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem,
+		_fs;
+
+	const DBSIZE = 5*1024*1024;
+	const DBTYPE = TEMPORARY;
+
+
+
+	function openFs(callback){
+
+		if(_fs){
+			callback(_fs);
+			return;
+		}
+
+		_requestFileSystem(DBTYPE,  DBSIZE, function(fs){
+			_fs = fs;
+			callback(fs);
+		}, _error);
+
+	}
+
+	function preload(path) {
+		// var fromCache = check(path);
+		// 
+		// if(!fromCache){
+		// 	_queue.add(path);
+		// }
+	}
+
+	function batch(group, callback){
+		_queue.addGroup(group, callback);
+	}
+
+	//-- Fetches url
+	function get(path, callback) {
+
+		if(typeof(_urls[path]) != "undefined"){
+			return _urls[path];
+		}
+
+		check(path, function(fromCache){
+
+			var url;
+			//-- should only be checking urls? but blank on reload?
+			if(fromCache){
+				url = getURL(path, fromCache);
+				if(typeof(callback) != "undefined"){
+					callback(url);
+				}
+			}else{
+				_queue.add(path, function(file){
+					url = getURL(path, file);
+					if(typeof(callback) != "undefined"){
+						callback(url);
+					}
+				}, true);
+			}
+
+		});
+
+
+	}
+
+	function check(path, callback) {
+		var request,
+			objectStore;
+
+		openFs(function(fs){
+			fs.root.getFile(path, {}, 
+			function(fileEntry) {
+				callback(fileEntry);
+			}, 
+			function(){
+				callback(false);
+			});
+		});
+
+	}
+
+	//-- should be in worker
+
+	function request(path, callback) {
+		var xhr = new FP.core.loadFile(path);
+
+		xhr.succeeded = function(file) {
+			if(typeof(callback) != "undefined"){
+				callback(file);
+			}
+		}
+
+		xhr.failed = _error;
+
+		xhr.start();
+	}
+
+	function save(path, file) {
+		var	entry = {"path" : path, "file": file},
+			request;
+
+		var transaction = _db.transaction(["files"], "readwrite");
+		var store = transaction.objectStore("files");	
+		request = store.put(entry);
+
+		request.onerror = function(event) {
+		  console.log("failed: " + event.target.errorCode);
+		};
+
+		request.onsuccess = function(event) {
+		  //-- Do nothing for now
+		  console.log("saved", path);
+		};
+	}
+
+	//-- end worker
+
+	function getURL(path, fileEntry){
+		var url;
+
+		if(typeof(_urls[path]) != "undefined"){
+			return _urls[path];
+		}
+
+		url = fileEntry.toURL();
+
+		_urls[path] = url;
+
+		return url;
+	}
+
+	function _error(err){
+		if(typeof(this.failed) == "undefined"){
+			console.log("Error: ", err);
+		}else{
+			this.failed(err);
+		}
+	}
+
+
+
+	return {
+		"get" : get,
+		"preload" : preload,
+		"batch" : batch
+	}	
+}