基于c++实现grpc服务端

1.下载grpc源码

git clone https://github.com/grpc/grpc

2.编译安装grpc

cd grpc
mkdir -p cmake/build
pushd cmake/build
git submodule update --init
cmake -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF ..
make -j8
sudo make install
popd

3.编写user.proto文件

syntax = "proto3";
package net;

message RegisterRequest
{
    string username = 1;
    string password = 2;
    string nickname = 3;
    string phonenumber = 4;
    string email    = 5;
}

message RegisterReply
{
    bool result = 1;
}

4.编译生成cpp文件

4.1 编译生成user.pb.h和user.pb.cc文件

protoc --cpp_out=./ user.proto

4.2 编译生成user.grpc.pb.h和user.grpc.pb.cc文件

protoc --grpc_out=. --plugin=protoc-gen-grpc=`which grpc_cpp_plugin` ./user.proto 

5. 服务端工程结构如下

5.1 主目录CMakeLists.txt

project(detect-server)

cmake_minimum_required(VERSION 3.13)

add_compile_options(-std=c++2a)

add_subdirectory(srcs)

5.2 cmake/common.cmake

# Copyright 2018 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.
#
# cmake build file for C++ route_guide example.
# Assumes protobuf and gRPC have been installed using cmake.
# See cmake_externalproject/CMakeLists.txt for all-in-one cmake build
# that automatically builds all the dependencies before building route_guide.

cmake_minimum_required(VERSION 3.5.1)

set (CMAKE_CXX_STANDARD 14)

if(MSVC)
  add_definitions(-D_WIN32_WINNT=0x600)
endif()

find_package(Threads REQUIRED)

if(GRPC_AS_SUBMODULE)
  # One way to build a projects that uses gRPC is to just include the
  # entire gRPC project tree via "add_subdirectory".
  # This approach is very simple to use, but the are some potential
  # disadvantages:
  # * it includes gRPC's CMakeLists.txt directly into your build script
  #   without and that can make gRPC's internal setting interfere with your
  #   own build.
  # * depending on what's installed on your system, the contents of submodules
  #   in gRPC's third_party/* might need to be available (and there might be
  #   additional prerequisites required to build them). Consider using
  #   the gRPC_*_PROVIDER options to fine-tune the expected behavior.
  #
  # A more robust approach to add dependency on gRPC is using
  # cmake's ExternalProject_Add (see cmake_externalproject/CMakeLists.txt).

  # Include the gRPC's cmake build (normally grpc source code would live
  # in a git submodule called "third_party/grpc", but this example lives in
  # the same repository as gRPC sources, so we just look a few directories up)
  add_subdirectory(../../.. ${CMAKE_CURRENT_BINARY_DIR}/grpc EXCLUDE_FROM_ALL)
  message(STATUS "Using gRPC via add_subdirectory.")

  # After using add_subdirectory, we can now use the grpc targets directly from
  # this build.
  set(_PROTOBUF_LIBPROTOBUF libprotobuf)
  set(_REFLECTION grpc++_reflection)
  if(CMAKE_CROSSCOMPILING)
    find_program(_PROTOBUF_PROTOC protoc)
  else()
    set(_PROTOBUF_PROTOC $)
  endif()
  set(_GRPC_GRPCPP grpc++)
  if(CMAKE_CROSSCOMPILING)
    find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
  else()
    set(_GRPC_CPP_PLUGIN_EXECUTABLE $)
  endif()
elseif(GRPC_FETCHCONTENT)
  # Another way is to use CMake's FetchContent module to clone gRPC at
  # configure time. This makes gRPC's source code available to your project,
  # similar to a git submodule.
  message(STATUS "Using gRPC via add_subdirectory (FetchContent).")
  include(FetchContent)
  FetchContent_Declare(
    grpc
    GIT_REPOSITORY https://github.com/grpc/grpc.git
    # when using gRPC, you will actually set this to an existing tag, such as
    # v1.25.0, v1.26.0 etc..
    # For the purpose of testing, we override the tag used to the commit
    # that's currently under test.
    GIT_TAG        vGRPC_TAG_VERSION_OF_YOUR_CHOICE)
  FetchContent_MakeAvailable(grpc)

  # Since FetchContent uses add_subdirectory under the hood, we can use
  # the grpc targets directly from this build.
  set(_PROTOBUF_LIBPROTOBUF libprotobuf)
  set(_REFLECTION grpc++_reflection)
  set(_PROTOBUF_PROTOC $)
  set(_GRPC_GRPCPP grpc++)
  if(CMAKE_CROSSCOMPILING)
    find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
  else()
    set(_GRPC_CPP_PLUGIN_EXECUTABLE $)
  endif()
else()
  # This branch assumes that gRPC and all its dependencies are already installed
  # on this system, so they can be located by find_package().

  # Find Protobuf installation
  # Looks for protobuf-config.cmake file installed by Protobuf's cmake installation.
  set(protobuf_MODULE_COMPATIBLE TRUE)
  find_package(Protobuf CONFIG REQUIRED)
  message(STATUS "Using protobuf ${Protobuf_VERSION}")

  set(_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)
  set(_REFLECTION gRPC::grpc++_reflection)
  if(CMAKE_CROSSCOMPILING)
    find_program(_PROTOBUF_PROTOC protoc)
  else()
    set(_PROTOBUF_PROTOC $)
  endif()

  # Find gRPC installation
  # Looks for gRPCConfig.cmake file installed by gRPC's cmake installation.
  find_package(gRPC CONFIG REQUIRED)
  message(STATUS "Using gRPC ${gRPC_VERSION}")

  set(_GRPC_GRPCPP gRPC::grpc++)
  if(CMAKE_CROSSCOMPILING)
    find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
  else()
    set(_GRPC_CPP_PLUGIN_EXECUTABLE $)
  endif()
endif()

5.3 src/main.cpp

#include 
#include 
#include 
#include 
#include "user.grpc.pb.h"
#include "user.pb.h"

using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using net::RegisterRequest;
using net::RegisterResponse;

class ServiceImpl : public net::UserService::Service
{
public:
    ServiceImpl()
    {
    }

    virtual ~ServiceImpl()
    {
    }

    virtual Status Register(ServerContext* context,
                            const RegisterRequest* request, 
                            RegisterResponse* response) override
    {
        for (auto userInfo : m_userInfos)
        {
            if (userInfo.username() == request->username())
            {
                m_userInfos.push_back(*request);
                response->set_result(false); 
                break;
            }

        }
       response->set_result(true);

       return grpc::Status::OK;
    }

private:
    std::vector<net::RegisterRequest> m_userInfos;
};

void RunServer(const std::string &server_address)
{
    grpc::EnableDefaultHealthCheckService(true);
    grpc::reflection::InitProtoReflectionServerBuilderPlugin();

    ServiceImpl service;
    ServerBuilder builder;
    builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
    builder.RegisterService(&service);

    std::unique_ptr<Server> server(builder.BuildAndStart());
    std::cout << "Server listening on " << server_address << std::endl;

    server->Wait();
}

int main(int argc, char *argv[])
{
    if (argc < 2)
    {
        std::cerr << "Specify an IP address and port number in the format of address: port number." << std::endl;
        return EXIT_FAILURE;
    }

    RunServer(argv[1]);

    return EXIT_SUCCESS;
}