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unifex-server.cpp
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unifex-server.cpp
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// 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 "example/v1/example.grpc.pb.h"
#include "example/v1/example_ext.grpc.pb.h"
#include "grpc/health/v1/health.grpc.pb.h"
#include "helper.hpp"
#include "server_shutdown_unifex.hpp"
#include <agrpc/asio_grpc.hpp>
#include <agrpc/health_check_service.hpp>
#include <grpcpp/server.h>
#include <grpcpp/server_builder.h>
#include <unifex/finally.hpp>
#include <unifex/just_from.hpp>
#include <unifex/just_void_or_done.hpp>
#include <unifex/let_value_with.hpp>
#include <unifex/sync_wait.hpp>
#include <unifex/task.hpp>
#include <unifex/then.hpp>
#include <unifex/when_all.hpp>
#include <unifex/with_query_value.hpp>
// Example showing some of the features of using asio-grpc with libunifex.
using ExampleService = example::v1::Example::AsyncService;
using UnaryRPC = agrpc::ServerRPC<&ExampleService::RequestUnary>;
using ServerStreamingRPC = agrpc::ServerRPC<&ExampleService::RequestServerStreaming>;
// begin-snippet: server-side-unifex-unary
// ---------------------------------------------------
// Register a request handler to unary requests. A bit of boilerplate code regarding stop_source has been added to make
// the example testable.
// ---------------------------------------------------
// end-snippet
auto register_unary_request_handler(agrpc::GrpcContext& grpc_context, example::v1::Example::AsyncService& service)
{
// Register a handler for all incoming RPCs of this unary method until the server is being shut down.
return agrpc::register_sender_rpc_handler<UnaryRPC>(grpc_context, service,
[&](UnaryRPC& rpc, const UnaryRPC::Request& request)
{
return unifex::let_value_with(
[]
{
return UnaryRPC::Response{};
},
[&](auto& response)
{
response.set_integer(request.integer());
return rpc.finish(response, grpc::Status::OK);
});
});
}
// ---------------------------------------------------
//
// begin-snippet: server-side-unifex-server-streaming
// ---------------------------------------------------
// A simple server-streaming request handler using coroutines.
// ---------------------------------------------------
// end-snippet
auto handle_server_streaming_request(agrpc::GrpcContext& grpc_context, example::v1::Example::AsyncService& service)
{
return agrpc::register_sender_rpc_handler<ServerStreamingRPC>(
grpc_context, service,
[&](ServerStreamingRPC& rpc, const ServerStreamingRPC::Request& request) -> unifex::task<void>
{
for (google::protobuf::int32 i = 0; i < request.integer(); ++i)
{
example::v1::Response response;
response.set_integer(i);
if (!co_await rpc.write(response))
{
// The client hung up.
co_return;
}
}
co_await rpc.finish(grpc::Status::OK);
});
}
// ---------------------------------------------------
//
// ---------------------------------------------------
// The SlowUnary endpoint is used by the client to demonstrate per-RPC step cancellation. See unifex-client.cpp.
// ---------------------------------------------------
auto handle_slow_unary_request(agrpc::GrpcContext& grpc_context, example::v1::ExampleExt::AsyncService& service)
{
using RPC = agrpc::ServerRPC<&example::v1::ExampleExt::AsyncService::RequestSlowUnary>;
return agrpc::register_sender_rpc_handler<RPC>(
grpc_context, service,
[&](RPC& rpc, const RPC::Request& request) -> unifex::task<void>
{
agrpc::Alarm alarm{grpc_context};
co_await alarm.wait(std::chrono::system_clock::now() + std::chrono::milliseconds(request.delay()));
co_await rpc.finish({}, grpc::Status::OK);
});
}
// ---------------------------------------------------
//
auto register_shutdown_request_handler(agrpc::GrpcContext& grpc_context, example::v1::ExampleExt::AsyncService& service,
example::ServerShutdown& server_shutdown)
{
using RPC = agrpc::ServerRPC<&example::v1::ExampleExt::AsyncService::RequestShutdown>;
auto rpc_handler = [&](RPC& rpc, const RPC::Request&)
{
return unifex::let_value_with(
[]
{
return RPC::Response{};
},
[&](auto& response)
{
return rpc.finish(response, grpc::Status::OK);
}) |
unifex::then(
[&](bool)
{
server_shutdown.shutdown();
});
};
return agrpc::register_sender_rpc_handler<RPC>(grpc_context, service, std::move(rpc_handler));
}
template <class Sender>
void run_grpc_context_for_sender(agrpc::GrpcContext& grpc_context, Sender&& sender)
{
grpc_context.work_started();
unifex::sync_wait(
unifex::when_all(unifex::finally(std::forward<Sender>(sender), unifex::just_from(
[&]
{
grpc_context.work_finished();
})),
unifex::just_from(
[&]
{
grpc_context.run();
})));
}
int main(int argc, const char** argv)
{
const auto port = argc >= 2 ? argv[1] : "50051";
const auto host = std::string("0.0.0.0:") + port;
example::v1::Example::AsyncService service;
example::v1::ExampleExt::AsyncService service_ext;
std::unique_ptr<grpc::Server> server;
grpc::ServerBuilder builder;
agrpc::GrpcContext grpc_context{builder.AddCompletionQueue()};
builder.AddListeningPort(host, grpc::InsecureServerCredentials());
builder.RegisterService(&service);
builder.RegisterService(&service_ext);
agrpc::add_health_check_service(builder);
server = builder.BuildAndStart();
abort_if_not(bool{server});
agrpc::start_health_check_service(*server, grpc_context);
example::ServerShutdown server_shutdown{*server};
run_grpc_context_for_sender(
grpc_context, unifex::with_query_value(unifex::when_all(register_unary_request_handler(grpc_context, service),
handle_server_streaming_request(grpc_context, service),
handle_slow_unary_request(grpc_context, service_ext),
register_shutdown_request_handler(
grpc_context, service_ext, server_shutdown)),
unifex::get_scheduler, unifex::inline_scheduler{}));
}