experimental gears cache work

manifest.json

@@ -1,9 +1,18 @@
 {
   "betaManifestVersion": 1,
-  "version": "my_version_string",
+  "version": "0",
   "entries": [
-      { "url": "go_offline.html"},
+      { "url": "tt-rss.php"},
-      { "url": "go_offline.js"},
+      { "url": "tt-rss.css"},
-      { "url": "../gears_init.js"}
+      { "url": "viewfeed.js"},
+      { "url": "feedlist.js"},
+      { "url": "functions.js"},
+      { "url": "tt-rss.js"},
+      { "url": "lib/scriptaculous/effects.js"},
+      { "url": "lib/scriptaculous/controls.js"},
+      { "url": "lib/scriptaculous/dragdrop.js"},
+      { "url": "lib/scriptaculous/scriptaculous.js"},
+      { "url": "lib/prototype.js"},
+      { "url": "gears_init.js"}
     ]
-}
+}

tt-rss.js

@@ -19,6 +19,10 @@ var ver_offset = 0;
 var hor_offset = 0;
 var feeds_sort_by_unread = false;
 var feedlist_sortable_enabled = false;
+var offline_mode = false;
+var store = false;
+var localServer = false;
+var db = false;
 
 function activeFeedIsCat() {
 	return _active_feed_is_cat;
@@ -131,7 +135,11 @@ function backend_sanity_check_callback(transport) {
 		}
 
 		if (!transport.responseXML) {
-			fatalError(3, "Sanity check: Received reply is not XML", transport.responseText);
+			if (!google.gears) {
+				fatalError(3, "Sanity check: Received reply is not XML", transport.responseText);
+			} else {
+				init_offline();
+			}
 			return;
 		}
 
@@ -369,6 +377,8 @@ function init() {
 		if (arguments.callee.done) return;
 		arguments.callee.done = true;		
 
+		init_gears();
+
 		disableContainerChildren("headlinesToolbar", true);
 
 		Form.disable("main_toolbar_form");
@@ -1451,3 +1461,31 @@ function feedBrowserSubscribe() {
 	}
 }
 
+function init_gears() {
+	try {
+
+		if (google.gears) {
+			localServer = google.gears.factory.create("beta.localserver");
+			store = localServer.createManagedStore("tt-rss");
+			db = google.gears.factory.create('beta.database');
+			db.open('tt-rss');
+
+			db.execute("CREATE TABLE IF NOT EXISTS cache (id text, article text, param text, added text)");
+		}	
+
+	} catch (e) {
+		exception_error("init_gears", e);
+	}
+}
+
+function init_offline() {
+	try {
+		offline_mode = true;
+
+		remove_splash();
+
+	} catch (e) {
+		exception_error("init_offline", e);
+	}
+}
+

viewfeed.js

@@ -1466,65 +1466,116 @@ function cdmWatchdog() {
 
 
 function cache_inject(id, article, param) {
-	if (!cache_check_param(id, param)) {
+	try {
-		debug("cache_article: miss: " + id + " [p=" + param + "]");
+		if (!cache_check_param(id, param)) {
+			debug("cache_article: miss: " + id + " [p=" + param + "]");
+	
+	
+			if (db) {
 
-		var cache_obj = new Array();
+			   var date = new Date();
+		      var ts = Math.round(date.getTime() / 1000);
 
-		cache_obj["id"] = id;
+				db.execute("INSERT INTO cache (id, article, param, added) VALUES (?, ?, ?, ?)",
-		cache_obj["data"] = article;
+					[id, article, param, ts]);				
-		cache_obj["param"] = param;
+			} else {
-
+	
-		article_cache.push(cache_obj);
+				var cache_obj = new Array();
-
+	
-	} else {
+				cache_obj["id"] = id;
-		debug("cache_article: hit: " + id + " [p=" + param + "]");
+				cache_obj["data"] = article;
+				cache_obj["param"] = param;
+	
+				article_cache.push(cache_obj);
+			}
+	
+		} else {
+			debug("cache_article: hit: " + id + " [p=" + param + "]");
+		}
+	} catch (e) {	
+		exception_error("cache_inject", e);
 	}
 }
 
 function cache_find(id) {
-	for (var i = 0; i < article_cache.length; i++) {
+
-		if (article_cache[i]["id"] == id) {
+	if (db) {
-			return article_cache[i]["data"];
+
+	} else {
+		for (var i = 0; i < article_cache.length; i++) {
+			if (article_cache[i]["id"] == id) {
+				return article_cache[i]["data"];
+			}
 		}
 	}
 	return false;
 }
 
 function cache_find_param(id, param) {
-	for (var i = 0; i < article_cache.length; i++) {
+
-		if (article_cache[i]["id"] == id && article_cache[i]["param"] == param) {
+	if (db) {
-			return article_cache[i]["data"];
+		var rs = db.execute("SELECT article FROM cache WHERE id = ? AND param = ?",
+			[id, param]);
+
+		if (rs.isValidRow()) {
+			return rs.field(0);
+		}
+
+	} else {
+		for (var i = 0; i < article_cache.length; i++) {
+			if (article_cache[i]["id"] == id && article_cache[i]["param"] == param) {
+				return article_cache[i]["data"];
+			}
 		}
 	}
 	return false;
 }
 
 function cache_check(id) {
-	for (var i = 0; i < article_cache.length; i++) {
+
-		if (article_cache[i]["id"] == id) {
+	if (db) {
-			return true;
+		var rs = db.execute("SELECT COUNT(*) AS c FROM cache WHERE id = ?",
+			[id]);
+
+		if (rs.isValidRow()) {
+			return rs.field(0) != "0";
+		}
+
+	} else {
+		for (var i = 0; i < article_cache.length; i++) {
+			if (article_cache[i]["id"] == id) {
+				return true;
+			}
 		}
 	}
 	return false;
 }
 
 function cache_check_param(id, param) {
-	for (var i = 0; i < article_cache.length; i++) {
 
-//		debug("cache_check_param " + article_cache[i]["id"] + ":" + 
+	if (db) {
-//			article_cache[i]["param"] + " vs " + id + ":" + param);
+		var rs = db.execute("SELECT COUNT(*) AS c FROM cache WHERE id = ? AND param = ?",
+			[id, param]);
 
-		if (article_cache[i]["id"] == id && article_cache[i]["param"] == param) {
+		if (rs.isValidRow()) {
-			return true;
+			return rs.field(0) != "0";
+		}
+
+	} else {
+		for (var i = 0; i < article_cache.length; i++) {
+			if (article_cache[i]["id"] == id && article_cache[i]["param"] == param) {
+				return true;
+			}
 		}
 	}
 	return false;
 }
 
 function cache_expire() {
-	while (article_cache.length > 25) {
+	if (!db) {
-		article_cache.shift();
+		while (article_cache.length > 25) {
+			article_cache.shift();
+		}
 	}
 }
 
@@ -1533,18 +1584,25 @@ function cache_empty() {
 }
 
 function cache_invalidate(id) {
-	var i = 0
-
 	try {	
 
-		while (i < article_cache.length) {
+		if (db) {
-			if (article_cache[i]["id"] == id) {
+			rs = db.execute("DELETE FROM cache WHERE id = ?", [id]);
-				debug("cache_invalidate: removed id " + id);
+			return rs.rowsAffected != 0;
-				article_cache.splice(i, 1);
+		} else {
-				return true;
+
+			var i = 0
+
+			while (i < article_cache.length) {
+				if (article_cache[i]["id"] == id) {
+					debug("cache_invalidate: removed id " + id);
+					article_cache.splice(i, 1);
+					return true;
+				}
+				i++;
 			}
-			i++;
 		}
+
 		debug("cache_invalidate: id not found: " + id);
 		return false;
 	} catch (e) {