The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
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/*
*
* Copyright 2021 gRPC authors.
*
* 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 <iostream>
#include <memory>
#include <string>
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "absl/strings/str_cat.h"
#include <grpcpp/ext/admin_services.h>
#include <grpcpp/ext/proto_server_reflection_plugin.h>
#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#include <grpcpp/xds_server_builder.h>
#ifdef BAZEL_BUILD
#include "examples/protos/helloworld.grpc.pb.h"
#else
#include "helloworld.grpc.pb.h"
#endif
ABSL_FLAG(int32_t, port, 50051, "Server port for service.");
ABSL_FLAG(int32_t, maintenance_port, 50052,
"Server port for maintenance if --secure is used.");
ABSL_FLAG(bool, secure, true, "Secure mode");
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using helloworld::Greeter;
using helloworld::HelloReply;
using helloworld::HelloRequest;
// Logic and data behind the server's behavior.
class GreeterServiceImpl final : public Greeter::Service {
Status SayHello(ServerContext* context, const HelloRequest* request,
HelloReply* reply) override {
std::string prefix("Hello ");
reply->set_message(prefix + request->name());
return Status::OK;
}
};
void RunServer() {
grpc::EnableDefaultHealthCheckService(true);
grpc::reflection::InitProtoReflectionServerBuilderPlugin();
int port = absl::GetFlag(FLAGS_port);
int maintenance_port = absl::GetFlag(FLAGS_maintenance_port);
grpc::XdsServerBuilder xds_builder;
ServerBuilder builder;
std::unique_ptr<Server> xds_enabled_server;
std::unique_ptr<Server> server;
GreeterServiceImpl service;
// Register "service" as the instance through which we'll communicate with
// clients. In this case it corresponds to an *synchronous* service.
xds_builder.RegisterService(&service);
if (absl::GetFlag(FLAGS_secure)) {
// Listen on the given address with XdsServerCredentials and a fallback of
// InsecureServerCredentials
xds_builder.AddListeningPort(
absl::StrCat("0.0.0.0:", port),
grpc::XdsServerCredentials(grpc::InsecureServerCredentials()));
xds_enabled_server = xds_builder.BuildAndStart();
gpr_log(GPR_INFO, "Server starting on 0.0.0.0:%d", port);
grpc::AddAdminServices(&builder);
// For the maintenance server, do not use any authentication mechanism.
builder.AddListeningPort(absl::StrCat("0.0.0.0:", maintenance_port),
grpc::InsecureServerCredentials());
server = builder.BuildAndStart();
gpr_log(GPR_INFO, "Maintenance server listening on 0.0.0.0:%d",
maintenance_port);
} else {
grpc::AddAdminServices(&xds_builder);
// Listen on the given address without any authentication mechanism.
builder.AddListeningPort(absl::StrCat("0.0.0.0:", port),
grpc::InsecureServerCredentials());
server = xds_builder.BuildAndStart();
gpr_log(GPR_INFO, "Server listening on 0.0.0.0:%d", port);
}
// Wait for the server to shutdown. Note that some other thread must be
// responsible for shutting down the server for this call to ever return.
server->Wait();
}
int main(int argc, char** argv) {
absl::ParseCommandLine(argc, argv);
RunServer();
return 0;
}