1 files changed, 73 insertions, 0 deletions
diff --git a/toolkit/components/glean/bindings/private/Numerator.cpp b/toolkit/components/glean/bindings/private/Numerator.cpp
new file mode 100644
index 0000000000..87f931e53d
--- /dev/null
+++ b/toolkit/components/glean/bindings/private/Numerator.cpp
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/glean/bindings/Numerator.h"
+
+#include "nsString.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/dom/GleanMetricsBinding.h"
+#include "mozilla/glean/bindings/ScalarGIFFTMap.h"
+#include "mozilla/glean/fog_ffi_generated.h"
+#include "jsapi.h"
+
+namespace mozilla::glean {
+
+namespace impl {
+
+void NumeratorMetric::AddToNumerator(int32_t aAmount) const {
+  auto scalarId = ScalarIdForMetric(mId);
+  if (scalarId && aAmount >= 0) {
+    Telemetry::ScalarAdd(scalarId.extract(), u"numerator"_ns, aAmount);
+  }
+  fog_numerator_add_to_numerator(mId, aAmount);
+}
+
+Result<Maybe<std::pair<int32_t, int32_t>>, nsCString>
+NumeratorMetric::TestGetValue(const nsACString& aPingName) const {
+  nsCString err;
+  if (fog_numerator_test_get_error(mId, &err)) {
+    return Err(err);
+  }
+  if (!fog_numerator_test_has_value(mId, &aPingName)) {
+    return Maybe<std::pair<int32_t, int32_t>>();
+  }
+  int32_t num = 0;
+  int32_t den = 0;
+  fog_numerator_test_get_value(mId, &aPingName, &num, &den);
+  return Some(std::make_pair(num, den));
+}
+
+}  // namespace impl
+
+/* virtual */
+JSObject* GleanNumerator::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto) {
+  return dom::GleanNumerator_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void GleanNumerator::AddToNumerator(int32_t aAmount) {
+  mNumerator.AddToNumerator(aAmount);
+}
+
+void GleanNumerator::TestGetValue(const nsACString& aPingName,
+                                  dom::Nullable<dom::GleanRateData>& aResult,
+                                  ErrorResult& aRv) {
+  auto result = mNumerator.TestGetValue(aPingName);
+  if (result.isErr()) {
+    aRv.ThrowDataError(result.unwrapErr());
+    return;
+  }
+  auto optresult = result.unwrap();
+  if (!optresult.isNothing()) {
+    dom::GleanRateData ret;
+    auto pair = optresult.extract();
+    ret.mNumerator = pair.first;
+    ret.mDenominator = pair.second;
+    aResult.SetValue(std::move(ret));
+  }
+}
+
+}  // namespace mozilla::glean