1 files changed, 38 insertions, 0 deletions
diff --git a/services/common/app_services_logger/AppServicesLoggerComponents.h b/services/common/app_services_logger/AppServicesLoggerComponents.h
new file mode 100644
index 0000000000..015eae230b
--- /dev/null
+++ b/services/common/app_services_logger/AppServicesLoggerComponents.h
@@ -0,0 +1,38 @@
+/* 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/. */
+
+#ifndef mozilla_services_AppServicesLoggerComponents_h_
+#define mozilla_services_AppServicesLoggerComponents_h_
+
+#include "mozIAppServicesLogger.h"
+#include "nsCOMPtr.h"
+
+extern "C" {
+
+// Implemented in Rust, in the `app_services_logger` crate.
+nsresult NS_NewAppServicesLogger(mozIAppServicesLogger** aResult);
+
+}  // extern "C"
+
+namespace mozilla {
+namespace appservices {
+
+// The C++ constructor for a `services.appServicesLogger` service. This wrapper
+// exists because `components.conf` requires a component class constructor to
+// return an `already_AddRefed<T>`, but Rust doesn't have such a type. So we
+// call the Rust constructor using a `nsCOMPtr` (which is compatible with Rust's
+// `xpcom::RefPtr`) out param, and return that.
+already_AddRefed<mozIAppServicesLogger> NewLogService() {
+  nsCOMPtr<mozIAppServicesLogger> logger;
+  nsresult rv = NS_NewAppServicesLogger(getter_AddRefs(logger));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+  return logger.forget();
+}
+
+}  // namespace appservices
+}  // namespace mozilla
+
+#endif  // mozilla_services_AppServicesLoggerComponents_h_