Bug 1597211 - Calculate size of individual cursor response entries....

Bug 1597211 - Calculate size of individual cursor response entries. r=dom-workers-and-storage-reviewers,ytausky

Differential Revision: https://phabricator.services.mozilla.com/D53937

--HG--
extra : moz-landing-system : lando

dom/indexedDB/ActorsParent.cpp

@@ -9479,6 +9479,11 @@ struct CommonCursorTypeTraits {
     aResponse->key() = std::move(mPosition);
   }
+  template <typename Response>
+  static size_t GetKeySize(const Response* const aResponse) {
+    return aResponse->key().GetBuffer().Length();
+  }
+
  protected:
   const Key& GetPosition() const { return mPosition; }
@@ -9528,6 +9533,13 @@ struct IndexCursorTypeTraits : CommonCursorTypeTraits {
     aResponse->objectKey() = std::move(mObjectStorePosition);
   }
+  template <typename Response>
+  static size_t GetKeySize(const Response* const aResponse) {
+    return CommonCursorTypeTraits::GetKeySize(aResponse) +
+           aResponse->sortKey().GetBuffer().Length() +
+           aResponse->objectKey().GetBuffer().Length();
+  }
+
  private:
   Key mLocaleAwarePosition, mObjectStorePosition;
 };
@@ -9542,6 +9554,12 @@ struct KeyCursorTypeTraits {
   template <typename Response>
   static constexpr void MaybeFillCloneInfo(Response* const /*aResponse*/,
                                            FilesArray* const /*aFiles*/) {}
+
+  template <typename Response>
+  static constexpr size_t MaybeGetCloneInfoSize(
+      const Response* const /*aResponse*/) {
+    return 0;
+  }
 };
 template <bool StatementHasIndexKeyBindings>
@@ -9573,6 +9591,11 @@ struct ValueCursorTypeTraits {
     aFiles->AppendElement(std::move(mCloneInfo.mFiles));
   }
+  template <typename Response>
+  static size_t MaybeGetCloneInfoSize(const Response* const aResponse) {
+    return aResponse->cloneInfo().data().data.Size();
+  }
+
  private:
   StructuredCloneReadInfo mCloneInfo{
       JS::StructuredCloneScope::DifferentProcess};
@@ -25985,11 +26008,12 @@ Cursor::CursorOpBase::PopulateResponseFromTypedStatement(
   auto& responses = cursorTypeTraits.GetTypedResponse(&mResponse);
   auto* response = responses.AppendElement();
+
   cursorTypeTraits.FillKeys(response);
   cursorTypeTraits.MaybeFillCloneInfo(response, &mFiles);
-  // TODO: Calculate real size and return it.
-  return 0;
+  return cursorTypeTraits.GetKeySize(response) +
+         cursorTypeTraits.MaybeGetCloneInfoSize(response);
 }
 Cursor::CursorOpBase::ResponseSizeOrError