rework caching, use html5 local storage

allow caching of headlines
code cleanup

1 files changed, 106 insertions, 336 deletions

diff --git a/viewfeed.js b/viewfeed.js
index 3a21323da..0d20faf81 100644
--- a/viewfeed.js
+++ b/viewfeed.js
@@ -9,14 +9,11 @@ var post_under_pointer = false;
 
 var last_requested_article = false;
 
-var preload_id_batch = [];
-var preload_timeout_id = false;
-
-var cache_added = [];
-
 var catchup_id_batch = [];
 var catchup_timeout_id = false;
 
+var has_storage = 'sessionStorage' in window && window['sessionStorage'] !== null;
+
 function headlines_callback2(transport, offset) {
 	try {
 		handle_rpc_json(transport);
@@ -138,10 +135,12 @@ function headlines_callback2(transport, offset) {
 				}
 			}
 
+			cache_headlines(feed_id, is_cat, reply['headlines']['toolbar'], $("headlines-frame").innerHTML);
+
 			if (articles) {
 				for (var i = 0; i < articles.length; i++) {
 					var a_id = articles[i]['id'];
-					cache_inject(a_id, articles[i]['content']);
+					cache_set("article:" + a_id, articles[i]['content']);
 				}
 			} else {
 				console.log("no cached articles received");
@@ -210,14 +209,6 @@ function showArticleInHeadlines(id) {
 
 		var upd_img_pic = $("FUPDPIC-" + id);
 
-		var cache_prefix = "";
-
-		if (activeFeedIsCat()) {
-			cache_prefix = "C:";
-		} else {
-			cache_prefix = "F:";
-		}
-
 		var view_mode = false;
 
 		try {
@@ -232,22 +223,10 @@ function showArticleInHeadlines(id) {
 
 			upd_img_pic.src = "images/blank_icon.gif";
 
-			cache_invalidate(cache_prefix + getActiveFeedId());
-
-			/* cache_inject(cache_prefix + getActiveFeedId(),
-				$("headlines-frame").innerHTML,
-				getFeedUnread(getActiveFeedId())); */
+			cache_headlines(getActiveFeedId(), activeFeedIsCat(), null, $("headlines-frame").innerHTML);
 
 		} else if (article_is_unread && view_mode == "all_articles") {
-
-			cache_invalidate(cache_prefix + getActiveFeedId());
-
-			/* cache_inject(cache_prefix + getActiveFeedId(),
-				$("headlines-frame").innerHTML,
-				getFeedUnread(getActiveFeedId())-1); */
-
-		} else if (article_is_unread) {
-			cache_invalidate(cache_prefix + getActiveFeedId());
+			cache_headlines(getActiveFeedId(), activeFeedIsCat(), null, $("headlines-frame").innerHTML);
 		}
 
 		markHeadline(id);
@@ -282,7 +261,7 @@ function article_callback2(transport, id) {
 				if (active_post_id == article['id']) {
 					render_article(article['content']);
 				}
-				cache_inject(article['id'], article['content']);
+				cache_set("article:" + article['id'], article['content']);
 			});
 
 		} else {
@@ -307,7 +286,7 @@ function view(id) {
 	try {
 		console.log("loading article: " + id);
 
-		var cached_article = cache_find(id);
+		var cached_article = cache_get("article:" + id);
 
 		console.log("cache check result: " + (cached_article != false));
 
@@ -322,7 +301,7 @@ function view(id) {
 		var cids_to_request = Array();
 
 		for (var i = 0; i < neighbor_ids.length; i++) {
-			if (!cache_check(neighbor_ids[i])) {
+			if (!cache_get("article:" + neighbor_ids[i])) {
 				cids_to_request.push(neighbor_ids[i]);
 			}
 		}
@@ -356,9 +335,9 @@ function view(id) {
 			query = query + "&mode=prefetch_old";
 			render_article(cached_article);
 
-		}
+			return; // do not do prefetch_old request
 
-		cache_expire();
+		}
 
 		last_requested_article = id;
 
@@ -606,27 +585,17 @@ function selectionRemoveLabel(id, ids) {
 			return;
 		}
 
-//		var ok = confirm(__("Remove selected articles from label?"));
+		var query = "?op=rpc&subop=removeFromLabel&ids=" +
+			param_escape(ids.toString()) + "&lid=" + param_escape(id);
 
-//		if (ok) {
-
-			var query = "?op=rpc&subop=removeFromLabel&ids=" +
-				param_escape(ids.toString()) + "&lid=" + param_escape(id);
-
-			console.log(query);
-
-//			notify_progress("Loading, please wait...");
-
-			cache_invalidate("F:" + (-11 - id));
-
-			new Ajax.Request("backend.php", {
-				parameters: query,
-				onComplete: function(transport) {
-					handle_rpc_json(transport);
-					show_labels_in_headlines(transport);
-				} });
+		console.log(query);
 
-//		}
+		new Ajax.Request("backend.php", {
+			parameters: query,
+			onComplete: function(transport) {
+				handle_rpc_json(transport);
+				show_labels_in_headlines(transport);
+			} });
 
 	} catch (e) {
 		exception_error("selectionAssignLabel", e);
@@ -644,27 +613,17 @@ function selectionAssignLabel(id, ids) {
 			return;
 		}
 
-//		var ok = confirm(__("Assign selected articles to label?"));
-
-//		if (ok) {
-
-			cache_invalidate("F:" + (-11 - id));
-
-			var query = "?op=rpc&subop=assignToLabel&ids=" +
-				param_escape(ids.toString()) + "&lid=" + param_escape(id);
-
-			console.log(query);
-
-//			notify_progress("Loading, please wait...");
+		var query = "?op=rpc&subop=assignToLabel&ids=" +
+			param_escape(ids.toString()) + "&lid=" + param_escape(id);
 
-			new Ajax.Request("backend.php", {
-				parameters: query,
-				onComplete: function(transport) {
-					handle_rpc_json(transport);
-					show_labels_in_headlines(transport);
-				} });
+		console.log(query);
 
-//		}
+		new Ajax.Request("backend.php", {
+			parameters: query,
+			onComplete: function(transport) {
+				handle_rpc_json(transport);
+				show_labels_in_headlines(transport);
+			} });
 
 	} catch (e) {
 		exception_error("selectionAssignLabel", e);
@@ -959,7 +918,7 @@ function archiveSelection() {
 		console.log(query);
 
 		for (var i = 0; i < rows.length; i++) {
-			cache_invalidate(rows[i]);
+			cache_delete("article:" + rows[i]);
 		}
 
 		new Ajax.Request("backend.php", {
@@ -1037,7 +996,7 @@ function editArticleTags(id) {
 							if (tags) tags.innerHTML = tags_str.content;
 							if (tooltip) tooltip.attr('label', tags_str.content_full);
 
-							cache_invalidate(id);
+							cache_delete("article:" + id);
 						}
 
 					}});
@@ -1072,274 +1031,16 @@ function cdmScrollToArticleId(id) {
 	}
 }
 
-function cache_inject(id, article, param) {
-
-	try {
-		if (!cache_check_param(id, param)) {
-			//console.log("cache_article: miss: " + id + " [p=" + param + "]");
-
-		   var date = new Date();
-	      var ts = Math.round(date.getTime() / 1000);
-
-			var cache_obj = {};
-
-			cache_obj["id"] = id;
-			cache_obj["data"] = article;
-			cache_obj["param"] = param;
-
-			if (param) id = id + ":" + param;
-
-			cache_added["TS:" + id] = ts;
-
-			if (has_local_storage())
-				sessionStorage.setItem(id, JSON.stringify(cache_obj));
-			else
-				article_cache.push(cache_obj);
-
-		} else {
-			//console.log("cache_article: hit: " + id + " [p=" + param + "]");
-		}
-	} catch (e) {
-		exception_error("cache_inject", e);
-	}
-}
-
-function cache_find(id) {
-
-	if (has_local_storage()) {
-		var cache_obj = sessionStorage.getItem(id);
-
-		if (cache_obj) {
-			cache_obj = JSON.parse(cache_obj);
-
-			if (cache_obj)
-				return cache_obj['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) {
-
-	if (has_local_storage()) {
-
-		if (param) id = id + ":" + param;
-
-		var cache_obj = sessionStorage.getItem(id);
-
-		if (cache_obj) {
-			cache_obj = JSON.parse(cache_obj);
-
-			if (cache_obj)
-				return cache_obj['data'];
-		}
-
-	} 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) {
-	if (has_local_storage()) {
-		if (sessionStorage.getItem(id))
-			return true;
-	} 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) {
-	if (has_local_storage()) {
-
-		if (param) id = id + ":" + param;
-
-		if (sessionStorage.getItem(id))
-			return true;
-
-	} 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() {
-if (has_local_storage()) {
-
-		var date = new Date();
-		var timestamp = Math.round(date.getTime() / 1000);
-
-		for (var i = 0; i < sessionStorage.length; i++) {
-
-			var id = sessionStorage.key(i);
-
-			if (timestamp - cache_added["TS:" + id] > 180) {
-				sessionStorage.removeItem(id);
-			}
-		}
-
-	} else {
-		while (article_cache.length > 25) {
-			article_cache.shift();
-		}
-	}
-}
-
-function cache_flush() {
-	if (has_local_storage()) {
-		sessionStorage.clear();
-	} else {
-		article_cache = new Array();
-	}
-}
-
-function cache_invalidate(id) {
-	try {
-		if (has_local_storage()) {
-
-			var found = false;
-
-			for (var i = 0; i < sessionStorage.length; i++) {
-				var key = sessionStorage.key(i);
-
-//					console.warn("cache_invalidate: " + key_id + " cmp " + id);
-
-				if (key == id || key.indexOf(id + ":") == 0) {
-					sessionStorage.removeItem(key);
-					found = true;
-					break;
-				}
-			}
-
-			return found;
-
-		} else {
-			var i = 0
-
-			while (i < article_cache.length) {
-				if (article_cache[i]["id"] == id) {
-					//console.log("cache_invalidate: removed id " + id);
-					article_cache.splice(i, 1);
-					return true;
-				}
-				i++;
-			}
-		}
-
-		//console.log("cache_invalidate: id not found: " + id);
-		return false;
-	} catch (e) {
-		exception_error("cache_invalidate", e);
-	}
-}
-
 function getActiveArticleId() {
 	return active_post_id;
 }
 
-function preloadBatchedArticles() {
-	try {
-
-		var query = "?op=rpc&subop=getArticles&ids=" +
-			preload_id_batch.toString();
-
-		new Ajax.Request("backend.php", {
-			parameters: query,
-			onComplete: function(transport) {
-
-				preload_id_batch = [];
-
-				var articles = JSON.parse(transport.responseText);
-
-				for (var i = 0; i < articles.length; i++) {
-					var id = articles[i]['id'];
-					if (!cache_check(id)) {
-						cache_inject(id, articles[i]['content']);
-						//console.log("preloaded article: " + id);
-					}
-				}
-		} });
-
-	} catch (e) {
-		exception_error("preloadBatchedArticles", e);
-	}
-}
-
-function preloadArticleUnderPointer(id) {
-	try {
-		if (getInitParam("bw_limit") == "1") return;
-
-		if (post_under_pointer == id && !cache_check(id)) {
-
-			//console.log("trying to preload article " + id);
-
-			var neighbor_ids = getRelativePostIds(id, 1);
-
-			/* only request uncached articles */
-
-			if (preload_id_batch.indexOf(id) == -1) {
-				for (var i = 0; i < neighbor_ids.length; i++) {
-					if (!cache_check(neighbor_ids[i])) {
-						preload_id_batch.push(neighbor_ids[i]);
-					}
-				}
-			}
-
-			if (preload_id_batch.indexOf(id) == -1)
-				preload_id_batch.push(id);
-
-			//console.log("preload ids batch: " + preload_id_batch.toString());
-
-			window.clearTimeout(preload_timeout_id);
-			preload_batch_timeout_id = window.setTimeout('preloadBatchedArticles()', 1000);
-
-		}
-	} catch (e) {
-		exception_error("preloadArticleUnderPointer", e);
-	}
-}
-
 function postMouseIn(id) {
-	try {
-		if (post_under_pointer != id) {
-			post_under_pointer = id;
-			if (!isCdmMode()) {
-				window.setTimeout("preloadArticleUnderPointer(" + id + ")", 250);
-			}
-		}
-
-	} catch (e) {
-		exception_error("postMouseIn", e);
-	}
+	post_under_pointer = id;
 }
 
 function postMouseOut(id) {
-	try {
-		post_under_pointer = false;
-	} catch (e) {
-		exception_error("postMouseOut", e);
-	}
+	post_under_pointer = false;
 }
 
 function headlines_scroll_handler(e) {
@@ -1692,13 +1393,16 @@ function show_labels_in_headlines(transport) {
 
 				if (ctr) ctr.innerHTML = elem.labels;
 			});
+
+			cache_headlines(getActiveFeedId(), activeFeedIsCat(), null, $("headlines-frame").innerHTML);
+
 		}
 	} catch (e) {
 		exception_error("show_labels_in_headlines", e);
 	}
 }
 
-function toggleHeadlineActions() {
+/* function toggleHeadlineActions() {
 	try {
 		var e = $("headlineActionsBody");
 		var p = $("headlineActionsDrop");
@@ -1716,7 +1420,7 @@ function toggleHeadlineActions() {
 	} catch (e) {
 		exception_error("toggleHeadlineActions", e);
 	}
-}
+} */
 
 /* function publishWithNote(id, def_note) {
 	try {
@@ -2273,7 +1977,7 @@ function editArticleNote(id) {
 
 						var reply = JSON.parse(transport.responseText);
 
-						cache_invalidate(id);
+						cache_delete("article:" + id);
 
 						var elem = $("POSTNOTE-" + id);
 
@@ -2325,3 +2029,69 @@ function player(elem) {
 	}
 }
 
+function cache_set(id, obj) {
+	console.log("cache_set: " + id);
+	if (has_storage)
+		try {
+			sessionStorage[id] = obj;
+		} catch (e) {
+			if (e == QUOTA_EXCEEDED_ERR)
+				sessionStorage.clear();
+		}
+}
+
+function cache_get(id) {
+	if (has_storage)
+		return sessionStorage[id];
+}
+
+function cache_clear() {
+	if (has_storage)
+		sessionStorage.clear();
+}
+
+function cache_delete(id) {
+	if (has_storage)
+		sessionStorage.removeItem(id);
+}
+
+function cache_headlines(feed, is_cat, toolbar_obj, content_obj) {
+	if (toolbar_obj && content_obj) {
+		cache_set("feed:" + feed + ":" + is_cat,
+			JSON.stringify({toolbar: toolbar_obj, content: content_obj}));
+	} else {
+		try {
+			obj =	JSON.parse(cache_get("feed:" + feed + ":" + is_cat));
+
+			if (obj) {
+				if (toolbar_obj) obj.toolbar = toolbar_obj;
+				if (content_obj) obj.content = content_obj;
+
+				cache_set("feed:" + feed + ":" + is_cat, JSON.stringify(obj));
+			}
+
+		} catch (e) {
+			console.warn("cache_headlines failed: " + e);
+		}
+	}
+}
+
+function render_local_headlines(feed, is_cat, obj) {
+	try {
+
+		dijit.byId("headlines-toolbar").attr('content',
+			obj.toolbar);
+
+		dijit.byId("headlines-frame").attr('content',
+			obj.content);
+
+		dojo.parser.parse('headlines-toolbar');
+
+		$("headlines-frame").scrollTop = 0;
+		selectArticles('none');
+		setActiveFeedId(feed, is_cat);
+		initHeadlinesMenu();
+	} catch (e) {
+		exception_error("render_local_headlines", e);
+	}
+}