hello-world-client.cpp

// Copyright 2024 Dennis Hezel
//
// 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 "awaitable_client_rpc.hpp"
#include "helloworld/helloworld.grpc.pb.h"
#include "helper.hpp"
#include "rethrow_first_arg.hpp"

#include <agrpc/asio_grpc.hpp>
#include <boost/asio/co_spawn.hpp>
#include <grpcpp/client_context.h>
#include <grpcpp/create_channel.h>

namespace asio = boost::asio;

int main(int argc, const char** argv)
{
    const auto port = argc >= 2 ? argv[1] : "50051";
    const auto host = std::string("localhost:") + port;

    grpc::Status status;

    helloworld::Greeter::Stub stub{grpc::CreateChannel(host, grpc::InsecureChannelCredentials())};
    agrpc::GrpcContext grpc_context;

    asio::co_spawn(
        grpc_context,
        [&]() -> asio::awaitable<void>
        {
            using RPC = example::AwaitableClientRPC<&helloworld::Greeter::Stub::PrepareAsyncSayHello>;
            grpc::ClientContext client_context;
            helloworld::HelloRequest request;
            request.set_name("world");
            helloworld::HelloReply response;
            status = co_await RPC::request(grpc_context, stub, client_context, request, response);
            std::cout << status.ok() << " response: " << response.message() << std::endl;
        },
        example::RethrowFirstArg{});

    grpc_context.run();

    abort_if_not(status.ok());
}