1 files changed, 72 insertions, 0 deletions
diff --git a/toolkit/components/glean/bindings/private/Denominator.cpp b/toolkit/components/glean/bindings/private/Denominator.cpp
new file mode 100644
index 0000000000..3162c27f76
--- /dev/null
+++ b/toolkit/components/glean/bindings/private/Denominator.cpp
@@ -0,0 +1,72 @@
+/* -*- 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/Denominator.h"
+
+#include "nsString.h"
+#include "mozilla/Components.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/glean/bindings/ScalarGIFFTMap.h"
+#include "mozilla/glean/fog_ffi_generated.h"
+#include "nsIClassInfoImpl.h"
+#include "nsIScriptError.h"
+#include "Common.h"
+
+namespace mozilla::glean {
+
+namespace impl {
+
+void DenominatorMetric::Add(int32_t aAmount) const {
+  auto scalarId = ScalarIdForMetric(mId);
+  if (scalarId && aAmount >= 0) {
+    Telemetry::ScalarAdd(scalarId.extract(), aAmount);
+  }
+  fog_denominator_add(mId, aAmount);
+}
+
+Result<Maybe<int32_t>, nsCString> DenominatorMetric::TestGetValue(
+    const nsACString& aPingName) const {
+  nsCString err;
+  if (fog_denominator_test_get_error(mId, &err)) {
+    return Err(err);
+  }
+  if (!fog_denominator_test_has_value(mId, &aPingName)) {
+    return Maybe<int32_t>();
+  }
+  return Some(fog_denominator_test_get_value(mId, &aPingName));
+}
+
+}  // namespace impl
+
+NS_IMPL_CLASSINFO(GleanDenominator, nullptr, 0, {0})
+NS_IMPL_ISUPPORTS_CI(GleanDenominator, nsIGleanDenominator)
+
+NS_IMETHODIMP
+GleanDenominator::Add(int32_t aAmount) {
+  mDenominator.Add(aAmount);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GleanDenominator::TestGetValue(const nsACString& aStorageName,
+                               JS::MutableHandle<JS::Value> aResult) {
+  auto result = mDenominator.TestGetValue(aStorageName);
+  if (result.isErr()) {
+    aResult.set(JS::UndefinedValue());
+    LogToBrowserConsole(nsIScriptError::errorFlag,
+                        NS_ConvertUTF8toUTF16(result.unwrapErr()));
+    return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
+  }
+  auto optresult = result.unwrap();
+  if (optresult.isNothing()) {
+    aResult.set(JS::UndefinedValue());
+  } else {
+    aResult.set(JS::Int32Value(optresult.value()));
+  }
+  return NS_OK;
+}
+
+}  // namespace mozilla::glean