1 files changed, 105 insertions, 0 deletions
diff --git a/toolkit/components/glean/bindings/private/Rate.cpp b/toolkit/components/glean/bindings/private/Rate.cpp
new file mode 100644
index 0000000000..6bc6ad61c9
--- /dev/null
+++ b/toolkit/components/glean/bindings/private/Rate.cpp
@@ -0,0 +1,105 @@
+/* -*- 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/Rate.h"
+
+#include "jsapi.h"
+#include "nsString.h"
+#include "mozilla/Components.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/glean/bindings/Common.h"
+#include "mozilla/glean/bindings/ScalarGIFFTMap.h"
+#include "mozilla/glean/fog_ffi_generated.h"
+#include "nsIClassInfoImpl.h"
+
+namespace mozilla::glean {
+
+namespace impl {
+
+void RateMetric::AddToNumerator(int32_t aAmount) const {
+  auto scalarId = ScalarIdForMetric(mId);
+  if (scalarId && aAmount >= 0) {
+    Telemetry::ScalarAdd(scalarId.extract(), u"numerator"_ns, aAmount);
+  }
+  fog_rate_add_to_numerator(mId, aAmount);
+}
+
+void RateMetric::AddToDenominator(int32_t aAmount) const {
+  auto scalarId = ScalarIdForMetric(mId);
+  if (scalarId && aAmount >= 0) {
+    Telemetry::ScalarAdd(scalarId.extract(), u"denominator"_ns, aAmount);
+  }
+  fog_rate_add_to_denominator(mId, aAmount);
+}
+
+Result<Maybe<std::pair<int32_t, int32_t>>, nsCString> RateMetric::TestGetValue(
+    const nsACString& aPingName) const {
+  nsCString err;
+  if (fog_rate_test_get_error(mId, &err)) {
+    return Err(err);
+  }
+  if (!fog_rate_test_has_value(mId, &aPingName)) {
+    return Maybe<std::pair<int32_t, int32_t>>();
+  }
+  int32_t num = 0;
+  int32_t den = 0;
+  fog_rate_test_get_value(mId, &aPingName, &num, &den);
+  return Some(std::make_pair(num, den));
+}
+
+}  // namespace impl
+
+NS_IMPL_CLASSINFO(GleanRate, nullptr, 0, {0})
+NS_IMPL_ISUPPORTS_CI(GleanRate, nsIGleanRate)
+
+NS_IMETHODIMP
+GleanRate::AddToNumerator(int32_t aAmount) {
+  mRate.AddToNumerator(aAmount);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GleanRate::AddToDenominator(int32_t aAmount) {
+  mRate.AddToDenominator(aAmount);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GleanRate::TestGetValue(const nsACString& aPingName, JSContext* aCx,
+                        JS::MutableHandle<JS::Value> aResult) {
+  auto result = mRate.TestGetValue(aPingName);
+  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 {
+    // Build return value of the form: { numerator: n, denominator: d }
+    JS::Rooted<JSObject*> root(aCx, JS_NewPlainObject(aCx));
+    if (!root) {
+      return NS_ERROR_FAILURE;
+    }
+    auto pair = optresult.extract();
+    int32_t num = pair.first;
+    int32_t den = pair.second;
+    if (!JS_DefineProperty(aCx, root, "numerator", static_cast<double>(num),
+                           JSPROP_ENUMERATE)) {
+      return NS_ERROR_FAILURE;
+    }
+    if (!JS_DefineProperty(aCx, root, "denominator", static_cast<double>(den),
+                           JSPROP_ENUMERATE)) {
+      return NS_ERROR_FAILURE;
+    }
+    aResult.setObject(*root);
+  }
+  return NS_OK;
+}
+
+}  // namespace mozilla::glean