grpc/examples/cpp/features/unix_abstract/client.cc

// Copyright 2021 the 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 "examples/protos/helloworld.grpc.pb.h"

#include <grpcpp/grpcpp.h>

using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using helloworld::Greeter;
using helloworld::HelloReply;
using helloworld::HelloRequest;

class GreeterClient {
 public:
  GreeterClient(std::shared_ptr<Channel> channel)
      : stub_(Greeter::NewStub(channel)) {}

  std::string SayHello(const std::string& user) {
    HelloRequest request;
    request.set_name(user);
    HelloReply reply;
    ClientContext context;
    Status status = stub_->SayHello(&context, request, &reply);
    if (status.ok()) {
      return reply.message();
    }
    std::cout << status.error_code() << ": " << status.error_message()
              << std::endl;
    return "RPC failed";
  }

 private:
  std::unique_ptr<Greeter::Stub> stub_;
};

int main(int argc, char** argv) {
  std::string target_str("unix-abstract:grpc%00abstract");
  GreeterClient greeter(
      grpc::CreateChannel(target_str, grpc::InsecureChannelCredentials()));
  std::string user("arst");
  std::cout << "Sending '" << user << "' to " << target_str << " ... ";
  std::string reply = greeter.SayHello(user);
  std::cout << "Received: " << reply << std::endl;

  return 0;
}