fix #209: page-requests-completed-per-tab metric

docs/metrics.md

@@ -49,7 +49,7 @@ whether they are actively interacting with it.
   * Average number of container tabs when new window was clicked
 * How many containers do users have hidden at the same time? (when should we measure this? each time a container is hidden?)
 * Do users pin container tabs? (do we have existing Telemetry for pinning?)
-* Do users change URLs in a container tab? (sounds like it could be a flood unless we only record the first URL change?)
+* Do users visit more pages in container tabs than non-container tabs?
 
 ### Follow-up Questions
 
@@ -178,6 +178,17 @@ of a `testpilottest` telemetry ping for each scenario.
   }
 ```
 
+* The user closes a tab
+
+```js
+  {
+    "uuid": <uuid>,
+    "userContextId": <userContextId>,
+    "event": "page-requests-completed-per-tab",
+    "pageRequestCount": <pageRequestCount>
+  }
+```
+
 ### A Redshift schema for the payload:
 
 ```lua
@@ -188,6 +199,7 @@ local schema = {
     {"clickedContainerTabCount",    "INTEGER",   255,    nil,         "Fields[payload.clickedContainerTabCount]"},
     {"eventSource",                 "VARCHAR",   255,    nil,         "Fields[payload.eventSource]"},
     {"event",                       "VARCHAR",   255,    nil,         "Fields[payload.event]"},
+    {"pageRequestCount",            "INTEGER",   255,    nil,         "Fields[payload.pageRequestCount]"}
     {"hiddenContainersCount",       "INTEGER",   255,    nil,         "Fields[payload.hiddenContainersCount]"},
     {"shownContainersCount",        "INTEGER",   255,    nil,         "Fields[payload.shownContainersCount]"},
     {"totalContainersCount",        "INTEGER",   255,    nil,         "Fields[payload.totalContainersCount]"},

webextension/background.js

@@ -1,4 +1,3 @@
-
 const themeManager = {
   existingTheme: null,
   init() {
@@ -43,7 +42,43 @@ const themeManager = {
   }
 };
 
+const tabPageCounter = {
+  counter: {},
+
+  init() {
+    browser.tabs.onCreated.addListener(this.initTabCounter.bind(this));
+    browser.tabs.onRemoved.addListener(this.sendTabCountAndDelete.bind(this));
+    browser.webRequest.onCompleted.addListener(this.incrementTabCount.bind(this), {urls: ["<all_urls>"], types: ["main_frame"]});
+  },
+
+  initTabCounter(tab) {
+    this.counter[tab.id] = {
+      "cookieStoreId": tab.cookieStoreId,
+      "pageRequests": 0
+    };
+  },
+
+  sendTabCountAndDelete(tab) {
+    browser.runtime.sendMessage({
+      method: "sendTelemetryPayload",
+      event: "page-requests-completed-per-tab",
+      userContextId: this.counter[tab].cookieStoreId,
+      pageRequestCount: this.counter[tab].pageRequests
+    });
+    delete this.counter[tab.id];
+  },
+
+  incrementTabCount(details) {
+    browser.tabs.get(details.tabId).then(tab => {
+      this.counter[tab.id].pageRequests++;
+    }).catch(e => {
+      throw e;
+    });
+  }
+};
+
 themeManager.init();
+tabPageCounter.init();
 
 browser.runtime.sendMessage({
   method: "getPreference",

webextension/manifest.json

@@ -20,7 +20,9 @@
 
   "permissions": [
     "cookies",
-    "tabs"
+    "tabs",
+    "webRequest",
+    "<all_urls>"
   ],
 
   "browser_action": {