gRPC的命令参数里，
1. 如果要用pacakge，需要--proto_path的参数，
例如helloworld.proto的绝对路径是
/home/user/grpc_demo_ws/grpc_demo/hello_world/proto/helloworld.proto
在helloworld.proto里面的pacakge是
package grpc_demo.hello_world.proto;
那--proto_path的值就是/home/user/grpc_demo_ws
如果要生成带包名的DescriptorTable，--proto_path也是必须的
2. 如果pb.cc/pb.h/grpc.pb.cc/grpc.pb.h想要和proto放在同一个目录
--grpc_out 和 --cpp_out 也都是填入/home/user/grpc_demo_ws
最后实际生成的位置是加上package路径的/home/user/grpc_demo_ws/grpc_demo/hello_world/proto/
下载代码
https://download.csdn.net/download/howard789/87966195
client向server发送一条数据包含自己的名字（helloworld.proto），还有另外两个proto的数据结构（catInfo.proto和dogInfo.proto），server收到后，转成一条string发回给client
目录结构
CMakeLists.txt
cmake_minimum_required(VERSION 3.19)
project(grpc_demo)
set(CMAKE_CXX_STANDARD 17)
# 加载 gRPC ---------------------------------
include(cmake/common.cmake)
MESSAGE("LIB _REFLECTION :" ${_REFLECTION})
MESSAGE("LIB _GRPC_GRPCPP:" ${_GRPC_GRPCPP})
MESSAGE("LIB _PROTOBUF_LIBPROTOBUF:" ${_PROTOBUF_LIBPROTOBUF})
include_directories(/home/hao/.local/include)
# --------------------------------------------
include_directories(${CMAKE_SOURCE_DIR})
include_directories(${CMAKE_SOURCE_DIR}/grpc_demo)
#---------------------------------------------------------------------
set(PROTO_WS_DIR ${CMAKE_SOURCE_DIR})
MESSAGE("PROTO_WS_DIR:" ${PROTO_WS_DIR})
## Cat_PROTO--------------------------------------------
set(PROTO_ABSOLUTE_PATH ${PROTO_WS_DIR}/grpc_demo/cat/proto/cat.proto)
set(Regenerate_Proto ON)
include(cmake/common_generate_files.cmake)
## Dog_PROTO--------------------------------------------
set(PROTO_ABSOLUTE_PATH ${PROTO_WS_DIR}/grpc_demo/dog/proto/dog.proto)
set(Regenerate_Proto ON)
include(cmake/common_generate_files.cmake)
## HelloWorld_PROTO--------------------------------------------
set(PROTO_ABSOLUTE_PATH ${PROTO_WS_DIR}/grpc_demo/hello_world/proto/helloworld.proto)
set(Regenerate_Proto ON)
include(cmake/common_generate_files.cmake)
find_package(Threads REQUIRED)
add_executable(greeter_client grpc_demo/hello_world/greeter_client.cc)
target_link_libraries(greeter_client
helloworld_grpc_proto
dog_grpc_proto
cat_grpc_proto
absl::flags
absl::flags_parse
${_REFLECTION}
${_GRPC_GRPCPP}
${_PROTOBUF_LIBPROTOBUF})
add_executable(greeter_server grpc_demo/hello_world/greeter_server.cc)
target_link_libraries(greeter_server
helloworld_grpc_proto
dog_grpc_proto
cat_grpc_proto
absl::flags
absl::flags_parse
${_REFLECTION}
${_GRPC_GRPCPP}
${_PROTOBUF_LIBPROTOBUF})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 3.8)
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 $<TARGET_FILE: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 $<TARGET_FILE:grpc_cpp_plugin>)
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 $<TARGET_FILE:protoc>)
set(_GRPC_GRPCPP grpc++)
if(CMAKE_CROSSCOMPILING)
find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
else()
set(_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:grpc_cpp_plugin>)
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().
message(STATUS "gRPC and all its dependencies should be able to located by find_package().")
# Find Protobuf installation
# Looks for protobuf-config.cmake file installed by Protobuf's cmake installation.
option(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)
message(STATUS "CMAKE_CROSSCOMPILING: ${CMAKE_CROSSCOMPILING}")
if(CMAKE_CROSSCOMPILING)
find_program(_PROTOBUF_PROTOC protoc)
else()
set(_PROTOBUF_PROTOC $<TARGET_FILE: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 $<TARGET_FILE:gRPC::grpc_cpp_plugin>)
endif()
endif()
common_generate_files.cmake
#需要的参数
#PROTO_WS_DIR #工作目录的路径，就是proto档案的package上一级目录。这里是/home/user/grpc_demo_ws
#PROTO_ABSOLUTE_PATH #proto档案的绝对路径 例如/home/user/grpc_demo_ws/grpc_demo/hello_world/proto/helloworld.proto
#Regenerate_Proto #是否重新生成档案 pb.cc pb.h
get_filename_component(PROTO_NAME "${PROTO_ABSOLUTE_PATH}" NAME_WE)
get_filename_component(PROTO_SOURCE_DIR "${PROTO_ABSOLUTE_PATH}" PATH)
file(RELATIVE_PATH PROTO_PKG_DIR ${PROTO_WS_DIR} ${PROTO_SOURCE_DIR})
# Proto file
MESSAGE("PROTO_ABSOLUTE_PATH:" ${PROTO_ABSOLUTE_PATH})
MESSAGE("PROTO_WS_DIR:" ${PROTO_WS_DIR})
MESSAGE("PROTO_PKG_DIR:" ${PROTO_PKG_DIR})
MESSAGE("PROTO_NAME:" ${PROTO_NAME})
# Generated sources
set(_proto_srcs "${PROTO_WS_DIR}/${PROTO_PKG_DIR}/${PROTO_NAME}.pb.cc") #输出档案的绝对路径
set(_proto_hdrs "${PROTO_WS_DIR}/${PROTO_PKG_DIR}/${PROTO_NAME}.pb.h")
set(_grpc_srcs "${PROTO_WS_DIR}/${PROTO_PKG_DIR}/${PROTO_NAME}.grpc.pb.cc")
set(_grpc_hdrs "${PROTO_WS_DIR}/${PROTO_PKG_DIR}/${PROTO_NAME}.grpc.pb.h")
if(Regenerate_Proto)
MESSAGE("Regenerate_Proto" ${PROTO_NAME} " = ON")
add_custom_command(
OUTPUT "${_proto_srcs}" "${_proto_hdrs}" "${_grpc_srcs}" "${_grpc_hdrs}" #输出档案的绝对路径
COMMAND ${_PROTOBUF_PROTOC}
ARGS
--proto_path "${PROTO_WS_DIR}"
--grpc_out "${PROTO_WS_DIR}"
--cpp_out "${PROTO_WS_DIR}"
-I "${PROTO_WS_DIR}/${PROTO_PKG_DIR}"
--plugin=protoc-gen-grpc="${_GRPC_CPP_PLUGIN_EXECUTABLE}"
"${PROTO_ABSOLUTE_PATH}"
DEPENDS "${PROTO_ABSOLUTE_PATH}")
endif()
# Include generated *.pb.h files
include_directories("${PROTO_WS_DIR}/${PROTO_PKG_DIR}")
set(LIB_NAME ${PROTO_NAME}_grpc_proto)
MESSAGE(" ********************************* ${PROTO_NAME} 生成的 LIB_NAME名称 = ${LIB_NAME}")
# hw_grpc_proto
add_library(${LIB_NAME}
${_grpc_srcs}
${_grpc_hdrs}
${_proto_srcs}
${_proto_hdrs})
target_link_libraries(${LIB_NAME}
${_REFLECTION}
${_GRPC_GRPCPP}
${_PROTOBUF_LIBPROTOBUF})cat.proto
syntax = "proto3";
package grpc_demo.cat.proto;
message CatInfo{
string name = 1;
bool isMale = 2;
}
dog.proto
syntax = "proto3";
package grpc_demo.dog.proto;
message DogInfo{
string name = 1;
int32 age = 2;
}
helloworld.proto
// Copyright 2015 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.
syntax = "proto3";
option java_multiple_files = true;
option java_package = "io.grpc.examples.helloworld";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "HLW";
package grpc_demo.hello_world.proto;
import "grpc_demo/cat/proto/cat.proto";
import "grpc_demo/dog/proto/dog.proto";
// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply) {}
rpc SayHelloStreamReply (HelloRequest) returns (stream HelloReply) {}
}
// The request message containing the user's name.
message HelloRequest {
string name = 1;
grpc_demo.cat.proto.CatInfo catInfo=2;
grpc_demo.dog.proto.DogInfo dogInfo=3;
}
// The response message containing the greetings
message HelloReply {
string message = 1;
}
greeter_client.cc
#include <iostream>
#include <memory>
#include <string>
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include <grpcpp/grpcpp.h>
#include "helloworld.grpc.pb.h"
ABSL_FLAG(std::string, target, "localhost:50051", "Server address");
using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using grpc_demo::hello_world::proto::Greeter;
using grpc_demo::hello_world::proto::HelloReply;
using grpc_demo::hello_world::proto::HelloRequest;
class GreeterClient {
public:
GreeterClient(std::shared_ptr<Channel> channel)
: stub_(Greeter::NewStub(channel)) {}
// Assembles the client's payload, sends it and presents the response back
// from the server.
std::string SayHello(const std::string& user,grpc_demo::cat::proto::CatInfo* catinfo,grpc_demo::dog::proto::DogInfo* doginfo) {
// Data we are sending to the server.
HelloRequest request;
request.set_name(user);
request.set_allocated_catinfo(catinfo);
request.set_allocated_doginfo(doginfo);
// Container for the data we expect from the server.
HelloReply reply;
// Context for the client. It could be used to convey extra information to
// the server and/or tweak certain RPC behaviors.
ClientContext context;
// The actual RPC.
Status status = stub_->SayHello(&context, request, &reply);
// Act upon its status.
if (status.ok()) {
return reply.message();
} else {
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) {
absl::ParseCommandLine(argc, argv);
// Instantiate the client. It requires a channel, out of which the actual RPCs
// are created. This channel models a connection to an endpoint specified by
// the argument "--target=" which is the only expected argument.
std::string target_str = absl::GetFlag(FLAGS_target);
// We indicate that the channel isn't authenticated (use of
// InsecureChannelCredentials()).
GreeterClient greeter(
grpc::CreateChannel(target_str, grpc::InsecureChannelCredentials()));
std::string user("铲屎官John");
grpc_demo::cat::proto::CatInfo* catinfo=new grpc_demo::cat::proto::CatInfo();
catinfo->set_ismale(false);
catinfo->set_name("mimi");
grpc_demo::dog::proto::DogInfo* doginfo=new grpc_demo::dog::proto::DogInfo();
doginfo->set_name("happy");
doginfo->set_age(12);
std::string reply = greeter.SayHello(user,catinfo,doginfo);
std::cout << "client收到server回复: " << reply << std::endl;
return 0;
}
greeter_server.cc
/*
*
* Copyright 2015 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_format.h"
#include <grpcpp/ext/proto_server_reflection_plugin.h>
#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#ifdef BAZEL_BUILD
#include "examples/protos/helloworld.grpc.pb.h"
#else
#include "helloworld.grpc.pb.h"
#endif
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using grpc_demo::hello_world::proto::Greeter;
using grpc_demo::hello_world::proto::HelloReply;
using grpc_demo::hello_world::proto::HelloRequest;
ABSL_FLAG(uint16_t, port, 50051, "Server port for the service");
// 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::cout << "收到client的消息 "<< std::endl;
std::string prefix("你好 ");
reply->set_message(prefix + request->name()
+",Server收到 CatInfo:"+ request->catinfo().name()
+"," + std::to_string(request->catinfo().ismale())
+",DogInfo:"+ request->doginfo().name()
+"," + std::to_string(request->doginfo().age())
);
return Status::OK;
}
};
void RunServer(uint16_t port) {
std::string server_address = absl::StrFormat("0.0.0.0:%d", port);
GreeterServiceImpl service;
grpc::EnableDefaultHealthCheckService(true);
grpc::reflection::InitProtoReflectionServerBuilderPlugin();
ServerBuilder builder;
// Listen on the given address without any authentication mechanism.
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
// Register "service" as the instance through which we'll communicate with
// clients. In this case it corresponds to an *synchronous* service.
builder.RegisterService(&service);
// Finally assemble the server.
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
// 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(absl::GetFlag(FLAGS_port));
return 0;
}
其余*.pb.cc *.pb.h 是用cmake生成的
