a bit of refacotring work

src/js/background.js

@@ -101,7 +101,7 @@ return {
 
     // urls stats are kept on the back burner while waiting to be reactivated
     // in a tab or another.
-    pageStats: {},
+    pageStats: {}, // TODO: rename
 
     // A map of redirects, to allow reverse lookup of redirects from landing
     // page, so that redirection can be reported to the user.

src/js/pagestats.js

@@ -269,18 +269,18 @@ var makeRequestKey = function(uri, reqType) {
     }
     var key  = typeToCode[reqType] || 'z';
     return key +
-           String.fromCharCode(hint >>> 16, hint & 0xFFFF) +
+           String.fromCharCode(hint >>> 22, hint >>> 12 & 0x3FF, hint & 0xFFF) +
            stringPacker.pack(µmuri.hostnameFromURI(uri));
 };
 
 /******************************************************************************/
 
 var rememberRequestKey = function(reqKey) {
-    stringPacker.remember(reqKey.slice(3));
+    stringPacker.remember(reqKey.slice(4));
 };
 
 var forgetRequestKey = function(reqKey) {
-    stringPacker.forget(reqKey.slice(3));
+    stringPacker.forget(reqKey.slice(4));
 };
 
 /******************************************************************************/
@@ -288,7 +288,7 @@ var forgetRequestKey = function(reqKey) {
 // Exported
 
 var hostnameFromRequestKey = function(reqKey) {
-    return stringPacker.unpack(reqKey.slice(3));
+    return stringPacker.unpack(reqKey.slice(4));
 };
 
 PageRequestStats.prototype.hostnameFromRequestKey = hostnameFromRequestKey;
@@ -436,7 +436,6 @@ var pageStoreFactory = function(pageUrl) {
 /******************************************************************************/
 
 function PageStore(pageUrl) {
-    this.visible = false;
     this.requestStats = new WebRequestStats();
     this.off = false;
     this.init(pageUrl);
@@ -458,6 +457,8 @@ PageStore.prototype.init = function(pageUrl) {
     this.distinctRequestCount = 0;
     this.perLoadAllowedRequestCount = 0;
     this.perLoadBlockedRequestCount = 0;
+    this.boundCount = 0;
+    this.obsoleteAfter = 0;
     return this;
 };
 
@@ -465,18 +466,12 @@ PageStore.prototype.init = function(pageUrl) {
 
 PageStore.prototype.dispose = function() {
     this.requests.dispose();
-
-    // rhill 2013-11-07: Even though at init time these are reset, I still
-    // need to release the memory taken by these, which can amount to
-    // sizeable enough chunks (especially requests, through the request URL
-    // used as a key).
     this.pageUrl = '';
     this.pageHostname = '';
     this.pageDomain = '';
     this.domains = {};
     this.allHostnamesString = ' ';
     this.state = {};
-
     if ( pageStoreJunkyard.length < 8 ) {
         pageStoreJunkyard.push(this);
     }
@@ -487,7 +482,7 @@ PageStore.prototype.dispose = function() {
 PageStore.prototype.recordRequest = function(type, url, block) {
     // TODO: this makes no sense, I forgot why I put this here.
     if ( !this ) {
-        // console.error('HTTP Switchboard> PageStore.recordRequest(): no pageStats');
+        // console.error('pagestats.js > PageStore.recordRequest(): no pageStats');
         return;
     }
 
@@ -541,7 +536,7 @@ PageStore.prototype.recordRequest = function(type, url, block) {
     }
 
     µm.urlStatsChanged(this.pageUrl);
-    // console.debug("HTTP Switchboard> PageStore.recordRequest(): %o: %s @ %s", this, type, url);
+    // console.debug("pagestats.js > PageStore.recordRequest(): %o: %s @ %s", this, type, url);
 };
 
 /******************************************************************************/

src/js/start.js

@@ -29,9 +29,13 @@
 // normal way forbid binding behind the scene tab.
 // https://github.com/gorhill/httpswitchboard/issues/67
 
-µMatrix.createPageStats(µMatrix.behindTheSceneURL);
-µMatrix.pageUrlToTabId[µMatrix.behindTheSceneURL] = µMatrix.behindTheSceneTabId;
-µMatrix.tabIdToPageUrl[µMatrix.behindTheSceneTabId] = µMatrix.behindTheSceneURL;
+(function() {
+    var µm = µMatrix;
+    var pageStore = µm.createPageStore(µm.behindTheSceneURL);
+    µm.pageUrlToTabId[µm.behindTheSceneURL] = µm.behindTheSceneTabId;
+    µm.tabIdToPageUrl[µm.behindTheSceneTabId] = µm.behindTheSceneURL;
+    pageStore.boundCount += 1;
+})();
 
 /******************************************************************************/
 

src/js/tab.js

@@ -25,27 +25,34 @@
 
 // Create a new page url stats store (if not already present)
 
-µMatrix.createPageStats = function(pageUrl) {
+µMatrix.createPageStore = function(pageURL) {
     // https://github.com/gorhill/httpswitchboard/issues/303
     // At this point, the URL has been page-URL-normalized
 
     // do not create stats store for urls which are of no interest
-    if ( pageUrl.search(/^https?:\/\//) !== 0 ) {
-        return undefined;
+    if ( pageURL.search(/^https?/) !== 0 ) {
+        return;
     }
-    var pageStats = this.pageStats[pageUrl];
-    if ( !pageStats ) {
-        pageStats = this.PageStore.factory(pageUrl);
+    var pageStore = null;
+    if ( this.pageStats.hasOwnProperty(pageURL) ) {
+        pageStore = this.pageStats[pageURL];
+    }
+    if ( pageStore === null ) {
+        pageStore = this.PageStore.factory(pageURL);
         // These counters are used so that icon presents an overview of how
         // much allowed/blocked.
-        pageStats.perLoadAllowedRequestCount =
-        pageStats.perLoadBlockedRequestCount = 0;
-        this.pageStats[pageUrl] = pageStats;
-    } else if ( pageStats.pageUrl !== pageUrl ) {
-        pageStats.init(pageUrl);
+        pageStore.perLoadAllowedRequestCount =
+        pageStore.perLoadBlockedRequestCount = 0;
+        this.pageStats[pageURL] = pageStore;
     }
 
-    return pageStats;
+    // TODO: revisit code, need to account for those web pages for which the
+    // URL changes with the content only updated
+    if ( pageStore.pageUrl !== pageURL ) {
+        pageStore.init(pageURL);
+    }
+
+    return pageStore;
 };
 
 /******************************************************************************/
@@ -54,7 +61,7 @@
 // Some kind of trick going on here:
 //   Any scheme other than 'http' and 'https' is remapped into a fake
 //   URL which trick the rest of µMatrix into being able to process an
-//   otherwise unmanageable scheme. µMatrix needs web page to have a proper
+//   otherwise unmanageable scheme. µMatrix needs web pages to have a proper
 //   hostname to work properly, so just like the 'chromium-behind-the-scene'
 //   fake domain name, we map unknown schemes into a fake '{scheme}-scheme'
 //   hostname. This way, for a specific scheme you can create scope with
@@ -89,15 +96,19 @@
     // Normalize to a page-URL.
     pageURL = this.normalizePageURL(pageURL);
 
-    var pageStats = this.createPageStats(pageURL);
+    if ( this.tabIdToPageUrl[tabId] === pageURL ) {
+        return this.pageStats[pageURL];
+    }
+
+    var pageStore = this.createPageStore(pageURL);
 
-    // console.debug('tab.js > µMatrix.bindTabToPageStats(): dispatching traffic in tab id %d to url stats store "%s"', tabId, pageUrl);
+    // console.debug('tab.js > bindTabToPageStats(): dispatching traffic in tab id %d to page store "%s"', tabId, pageUrl);
 
     // rhill 2013-11-24: Never ever rebind chromium-behind-the-scene
     // virtual tab.
     // https://github.com/gorhill/httpswitchboard/issues/67
     if ( tabId === this.behindTheSceneTabId ) {
-        return pageStats;
+        return pageStore;
     }
 
     this.unbindTabFromPageStats(tabId);
@@ -105,23 +116,33 @@
     // rhill 2014-02-08: Do not create an entry if no page store
     // exists (like when visiting about:blank)
     // https://github.com/gorhill/httpswitchboard/issues/186
-    if ( !pageStats ) {
+    if ( !pageStore ) {
         return null;
     }
-    pageStats.visible = true;
 
     this.pageUrlToTabId[pageURL] = tabId;
     this.tabIdToPageUrl[tabId] = pageURL;
+    pageStore.boundCount += 1;
 
-    return pageStats;
+    return pageStore;
 };
 
+/******************************************************************************/
+
 µMatrix.unbindTabFromPageStats = function(tabId) {
-    var pageUrl = this.tabIdToPageUrl[tabId];
-    if ( pageUrl ) {
-        delete this.pageUrlToTabId[pageUrl];
+    if ( this.tabIdToPageUrl.hasOwnProperty(tabId) === false ) {
+        return;
+    }
+    var pageURL = this.tabIdToPageUrl[tabId];
+    if ( this.pageStats.hasOwnProperty(pageURL) ) {
+        var pageStore = this.pageStats[pageURL];
+        pageStore.boundCount -= 1;
+        if ( pageStore.boundCount === 0 ) {
+            pageStore.obsoleteAfter = Date.now() + (5 * 60 * 60 * 1000);
+        }
     }
     delete this.tabIdToPageUrl[tabId];
+    delete this.pageUrlToTabId[pageURL];
 };
 
 /******************************************************************************/
@@ -355,59 +376,43 @@
 
 // Garbage collect stale url stats entries
 (function() {
-    var gcOrphanPageStats = function(tabs) {
-        var µm = µMatrix;
-        var visibleTabs = {};
-        tabs.map(function(tab) {
-            visibleTabs[tab.id] = true;
-        });
-        var pageUrls = Object.keys(µm.pageStats);
-        var i = pageUrls.length;
-        var pageUrl, tabId, pageStats;
-        while ( i-- ) {
-            pageUrl = pageUrls[i];
-            // Do not dispose of chromium-behind-the-scene virtual tab,
-            // GC is done differently on this one (i.e. just pruning).
-            if ( pageUrl === µm.behindTheSceneURL ) {
+    var µm = µMatrix;
+    var gcPageStats = function() {
+        var pageStore;
+        var now = Date.now();
+        for ( var pageURL in µm.pageStats ) {
+            if ( µm.pageStats.hasOwnProperty(pageURL) === false ) {
                 continue;
             }
-            tabId = µm.tabIdFromPageUrl(pageUrl);
-            pageStats = µm.pageStats[pageUrl];
-            if ( !visibleTabs[tabId] && !pageStats.visible ) {
-                // console.debug('HTTP Switchboard> tab.js: page stats garbage collector letting go of "%s"', pageUrl);
-                µm.cookieHunter.removePageCookies(pageStats);
-                µm.pageStats[pageUrl].dispose();
-                delete µm.pageStats[pageUrl];
+            pageStore = µm.pageStats[pageURL];
+            if ( pageStore.boundCount !== 0 ) {
+                continue;
             }
-            pageStats.visible = !!visibleTabs[tabId];
-            if ( !pageStats.visible ) {
-                µm.unbindTabFromPageStats(tabId);
+            if ( pageStore.obsoleteAfter > now ) {
+                continue;
             }
+            µm.cookieHunter.removePageCookies(pageStore);
+            µm.pageStats[pageURL].dispose();
+            delete µm.pageStats[pageURL];
         }
-    };
-
-    var gcPageStats = function() {
-        var µm = µMatrix;
-
-        // Get rid of stale pageStats, those not bound to a tab for more than
-        // {duration placeholder}.
-        chrome.tabs.query({ 'url': '<all_urls>' }, gcOrphanPageStats);
 
         // Prune content of chromium-behind-the-scene virtual tab
         // When `suggest-as-you-type` is on in Chromium, this can lead to a
         // LOT of uninteresting behind the scene requests.
-        var pageStats = µm.pageStats[µm.behindTheSceneURL];
-        if ( pageStats ) {
-            var reqKeys = pageStats.requests.getRequestKeys();
-            if ( reqKeys.length > µm.behindTheSceneMaxReq ) {
-                reqKeys = reqKeys.sort(function(a,b){
-                    return pageStats.requests[b] - pageStats.requests[a];
-                }).slice(µm.behindTheSceneMaxReq);
-                var iReqKey = reqKeys.length;
-                while ( iReqKey-- ) {
-                    pageStats.requests.disposeOne(reqKeys[iReqKey]);
-                }
-            }
+        pageStore = µm.pageStats[µm.behindTheSceneURL];
+        if ( !pageStore ) {
+            return;
+        }
+        var reqKeys = pageStore.requests.getRequestKeys();
+        if ( reqKeys.length <= µm.behindTheSceneMaxReq ) {
+            return;
+        }
+        reqKeys = reqKeys.sort(function(a,b){
+            return pageStore.requests[b] - pageStore.requests[a];
+        }).slice(µm.behindTheSceneMaxReq);
+        var iReqKey = reqKeys.length;
+        while ( iReqKey-- ) {
+            pageStore.requests.disposeOne(reqKeys[iReqKey]);
         }
     };
 
@@ -417,7 +422,7 @@
         'gcPageStats',
         null,
         gcPageStats,
-        8 * 60 * 1000,
+        5 * 60 * 1000,
         true
     );
 })();

src/js/uritools.js

@@ -227,7 +227,7 @@ URI.assemble = function(bits) {
 
 URI.schemeFromURI = function(uri) {
     var matches = reSchemeFromURI.exec(uri);
-    if ( !matches ) {
+    if ( matches === null ) {
         return '';
     }
     return matches[0].slice(0, -1).toLowerCase();