Bug 1360567 - Add telemetry probes for Indexeddb storage types, r=janv, datareview=francois

dom/indexedDB/IDBFactory.cpp

@@ -19,6 +19,7 @@
 #include "mozilla/ipc/BackgroundUtils.h"
 #include "mozilla/ipc/PBackground.h"
 #include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/Telemetry.h"
 #include "mozIThirdPartyUtil.h"
 #include "nsAboutProtocolUtils.h"
 #include "nsContentUtils.h"
@@ -477,6 +478,28 @@ IDBFactory::Open(JSContext* aCx,
                  CallerType aCallerType,
                  ErrorResult& aRv)
 {
+  if (!IsChrome() &&
+      aOptions.mStorage.WasPassed()) {
+    switch (aOptions.mStorage.Value()) {
+      case StorageType::Persistent: {
+        Telemetry::ScalarAdd(Telemetry::ScalarID::IDB_TYPE_PERSISTENT_COUNT, 1);
+        break;
+      }
+
+      case StorageType::Temporary: {
+        Telemetry::ScalarAdd(Telemetry::ScalarID::IDB_TYPE_TEMPORARY_COUNT, 1);
+        break;
+      }
+
+      case StorageType::Default:
+      case StorageType::EndGuard_:
+        break;
+
+      default:
+        MOZ_CRASH("Invalid storage type!");
+    }
+  }
+
   return OpenInternal(aCx,
                       /* aPrincipal */ nullptr,
                       aName,

toolkit/components/telemetry/Scalars.yaml

@@ -1052,6 +1052,35 @@ network.tcp:
     record_in_processes:
       - 'main'
 
+idb.type:
+  persistent_count:
+    bug_numbers:
+      - 1360567
+    description: >
+      Number of times indexeddb.open(name, {storage: "persistent"}) has been used.
+    expires: "60"
+    kind: uint
+    notification_emails:
+      - shuang@mozilla.com
+    release_channel_collection: opt-in
+    record_in_processes:
+      - 'main'
+      - 'content'
+
+  temporary_count:
+    bug_numbers:
+      - 1360567
+    description: >
+      Number of times indexeddb.open(name, {storage: "temporary"}) has been used.
+    expires: "60"
+    kind: uint
+    notification_emails:
+      - shuang@mozilla.com
+    release_channel_collection: opt-in
+    record_in_processes:
+      - 'main'
+      - 'content'
+
 # The following section contains probes that record timestamps.
 timestamps:
   first_paint: