chore: import upstream snapshot with attribution

src/brpc/builtin/grpc_health_check_service.cpp

@@ -0,0 +1,41 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 "brpc/builtin/common.h"
+#include "brpc/builtin/grpc_health_check_service.h"
+#include "brpc/controller.h"           // Controller
+#include "brpc/closure_guard.h"        // ClosureGuard
+#include "brpc/server.h"               // Server
+
+namespace brpc {
+    void GrpcHealthCheckService::Check(::google::protobuf::RpcController* cntl_base,
+                                  const grpc::health::v1::HealthCheckRequest* request,
+                                  grpc::health::v1::HealthCheckResponse* response,
+                                  ::google::protobuf::Closure* done) {
+        ClosureGuard done_guard(done);
+        Controller *cntl = static_cast<Controller*>(cntl_base);
+        const Server* server = cntl->server();
+        if (server->options().health_reporter) {
+            server->options().health_reporter->GenerateReport(
+                    cntl, done_guard.release());
+        } else {
+            response->set_status(grpc::health::v1::HealthCheckResponse_ServingStatus_SERVING);
+        }
+    }
+
+} // namespace brpc
+