Rename asset_stream_manager to cdc_stream (#27)

Fixes #13

cdc_stream/background_service_impl.cc

@@ -0,0 +1,56 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cdc_stream/background_service_impl.h"
+
+#include "common/grpc_status.h"
+#include "common/log.h"
+#include "common/util.h"
+#include "grpcpp/grpcpp.h"
+
+namespace cdc_ft {
+
+BackgroundServiceImpl::BackgroundServiceImpl() {}
+
+BackgroundServiceImpl::~BackgroundServiceImpl() = default;
+
+void BackgroundServiceImpl::SetExitCallback(ExitCallback exit_callback) {
+  exit_callback_ = std::move(exit_callback);
+}
+
+grpc::Status BackgroundServiceImpl::Exit(grpc::ServerContext* context,
+                                         const ExitRequest* request,
+                                         ExitResponse* response) {
+  LOG_INFO("RPC:Exit");
+  if (exit_callback_) {
+    return ToGrpcStatus(exit_callback_());
+  }
+  return grpc::Status::OK;
+}
+
+grpc::Status BackgroundServiceImpl::GetPid(grpc::ServerContext* context,
+                                           const GetPidRequest* request,
+                                           GetPidResponse* response) {
+  LOG_INFO("RPC:GetPid");
+  response->set_pid(static_cast<int32_t>(Util::GetPid()));
+  return grpc::Status::OK;
+}
+
+grpc::Status BackgroundServiceImpl::HealthCheck(grpc::ServerContext* context,
+                                                const EmptyProto* request,
+                                                EmptyProto* response) {
+  return grpc::Status::OK;
+}
+
+}  // namespace cdc_ft