Add a histogram for tracking web store promo

chrome/browser/dom_ui/app_launcher_handler.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/dom_ui/app_launcher_handler.h"
 
 #include "app/animation.h"
+#include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
+#include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/app_launched_animation.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/extensions/default_apps.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_icon_set.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/common/url_constants.h"
 #include "gfx/rect.h"
 #include "grit/browser_resources.h"
 #include "grit/generated_resources.h"
 
 namespace {
 
+// The URL prefixes used by the NTP to signal when the web store or an app
+// has launched. These are used for histogram purposes.
+const char* kLaunchAppPingURL = "record-app-launch";
+const char* kLaunchWebStorePingURL = "record-webstore-launch";
+
 // This extracts an int from a ListValue at the given |index|.
 bool ExtractInt(const ListValue* list, size_t index, int* out_int) {
   std::string string_value;
 
   if (list->GetString(index, &string_value)) {
     base::StringToInt(string_value, out_int);
     return true;
   }
 
   return false;
 }
 
 std::string GetIconURL(const Extension* extension, Extension::Icons icon,
                        const std::string& default_val) {
   GURL url = extension->GetIconURL(icon, ExtensionIconSet::MATCH_EXACTLY);
   if (!url.is_empty())
     return url.spec();
   else
     return default_val;
 }
 
+// Extracts the promo parameter from the |path| generated by a ping on the NTP.
+bool IsPromoActive(const std::string& path) {
+  std::vector<std::string> params;
+  base::SplitString(path, '+', &params);
+
+  CHECK(params.size() == 2);
+
+  return params.at(1) == "true";
+}
+
 }  // namespace
 
 AppLauncherHandler::AppLauncherHandler(ExtensionsService* extension_service)
-    : extensions_service_(extension_service) {
+    : extensions_service_(extension_service),
+      promo_active_(false) {
 }
 
 AppLauncherHandler::~AppLauncherHandler() {}
 
 DOMMessageHandler* AppLauncherHandler::Attach(DOMUI* dom_ui) {
   // TODO(arv): Add initialization code to the Apps store etc.
   return DOMMessageHandler::Attach(dom_ui);
 }
 
 void AppLauncherHandler::RegisterMessages() {
@@ skipping 73 matching lines @@
       CreateAppInfo(*it, extensions_service_->extension_prefs(), app_info);
       list->Append(app_info);
     }
   }
   dictionary->Set("apps", list);
 
   DefaultApps* default_apps = extensions_service_->default_apps();
   if (default_apps->ShouldShowPromo(extensions_service_->GetAppIds())) {
     dictionary->SetBoolean("showPromo", true);
     default_apps->DidShowPromo();
+    promo_active_ = true;
   } else {
     dictionary->SetBoolean("showPromo", false);
+    promo_active_ = false;
   }
 
   bool showLauncher =
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableAppLauncher);
   dictionary->SetBoolean("showLauncher", showLauncher);
 }
 
 void AppLauncherHandler::HandleGetApps(const ListValue* args) {
   DictionaryValue dictionary;
   FillAppDictionary(&dictionary);
@@ skipping 48 matching lines @@
   TabContents* old_contents = NULL;
   if (browser)
     old_contents = browser->GetSelectedTabContents();
 
   AnimateAppIcon(extension, rect);
   TabContents* new_contents = Browser::OpenApplication(
       profile, extension, extension->launch_container(), old_contents);
 
   if (new_contents != old_contents && browser->tab_count() > 1)
     browser->CloseTabContents(old_contents);
+
+  if (extension_id != extension_misc::kWebStoreAppId)
+    RecordAppLaunch(promo_active_);
 }
 
 void AppLauncherHandler::HandleSetLaunchType(const ListValue* args) {
   std::string extension_id;
   int launch_type;
   if (!args->GetString(0, &extension_id) ||
       !ExtractInt(args, 1, &launch_type)) {
     NOTREACHED();
     return;
   }
@@ skipping 31 matching lines @@
     return;  // Only one prompt at a time.
 
   extension_id_prompting_ = extension_id;
   GetExtensionInstallUI()->ConfirmUninstall(this, extension);
 }
 
 void AppLauncherHandler::HandleHideAppsPromo(const ListValue* args) {
   // If the user has intentionally hidden the promotion, we'll uninstall all the
   // default apps (we know the user hasn't installed any apps on their own at
   // this point, or the promotion wouldn't have been shown).
+  UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppsPromoHistogram,
+                            extension_misc::PROMO_CLOSE,
+                            extension_misc::PROMO_BUCKET_BOUNDARY);
   DefaultApps* default_apps = extensions_service_->default_apps();
   const ExtensionIdSet* app_ids = default_apps->GetDefaultApps();
   DCHECK(*app_ids == extensions_service_->GetAppIds());
 
   for (ExtensionIdSet::const_iterator iter = app_ids->begin();
        iter != app_ids->end(); ++iter) {
     if (extensions_service_->GetExtensionById(*iter, true))
       extensions_service_->UninstallExtension(*iter, false);
   }
 
   extensions_service_->default_apps()->SetPromoHidden();
 }
 
+// static
+bool AppLauncherHandler::HandlePing(const std::string& path) {
+  if (path.find(kLaunchWebStorePingURL) != std::string::npos) {
+    RecordWebStoreLaunch(IsPromoActive(path));
+    return true;
+  } else if (path.find(kLaunchAppPingURL) != std::string::npos) {
+    RecordAppLaunch(IsPromoActive(path));
+    return true;
+  }
+
+  return false;
+}
+
 ExtensionInstallUI* AppLauncherHandler::GetExtensionInstallUI() {
   if (!install_ui_.get())
     install_ui_.reset(new ExtensionInstallUI(dom_ui_->GetProfile()));
   return install_ui_.get();
 }
 
 void AppLauncherHandler::InstallUIProceed() {
   DCHECK(!extension_id_prompting_.empty());
 
   // The extension can be uninstalled in another window while the UI was
   // showing. Do nothing in that case.
   const Extension* extension =
       extensions_service_->GetExtensionById(extension_id_prompting_, true);
   if (!extension)
     return;
 
   extensions_service_->UninstallExtension(extension_id_prompting_,
                                           false /* external_uninstall */);
   extension_id_prompting_ = "";
 }
 
 void AppLauncherHandler::InstallUIAbort() {
   extension_id_prompting_ = "";
 }
+
+//static
+void AppLauncherHandler::RecordWebStoreLaunch(bool promo_active) {
+  if (!promo_active) return;
+
+  UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppsPromoHistogram,
+                            extension_misc::PROMO_LAUNCH_WEB_STORE,
+                            extension_misc::PROMO_BUCKET_BOUNDARY);
+}
+
+//static
+void AppLauncherHandler::RecordAppLaunch(bool promo_active) {
+  // TODO(jstritar): record app launches that occur when the promo is not
+  // active using a different histogram.
+
+  if (!promo_active) return;
+
+  UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppsPromoHistogram,
+                            extension_misc::PROMO_LAUNCH_APP,
+                            extension_misc::PROMO_BUCKET_BOUNDARY);
+}