add grpc example

example/grpc_c++/CMakeLists.txt

+cmake_minimum_required(VERSION 2.8.10)
+project(http_c++ C CXX)
+
+option(EXAMPLE_LINK_SO "Whether examples are linked dynamically" OFF)
+
+execute_process(
+    COMMAND bash -c "find ${CMAKE_SOURCE_DIR}/../.. -type d -regex \".*output/include$\" | head -n1 | xargs dirname | tr -d '\n'"
+    OUTPUT_VARIABLE OUTPUT_PATH
+)
+
+set(CMAKE_PREFIX_PATH ${OUTPUT_PATH})
+
+include(FindThreads)
+include(FindProtobuf)
+protobuf_generate_cpp(PROTO_SRC PROTO_HEADER helloworld.proto)
+# include PROTO_HEADER
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+find_path(GPERFTOOLS_INCLUDE_DIR NAMES gperftools/heap-profiler.h)
+find_library(GPERFTOOLS_LIBRARIES NAMES tcmalloc_and_profiler)
+include_directories(${GPERFTOOLS_INCLUDE_DIR})
+
+find_path(BRPC_INCLUDE_PATH NAMES brpc/server.h)
+if(EXAMPLE_LINK_SO)
+    find_library(BRPC_LIB NAMES brpc)
+else()
+    find_library(BRPC_LIB NAMES libbrpc.a brpc)
+endif()
+if((NOT BRPC_INCLUDE_PATH) OR (NOT BRPC_LIB))
+    message(FATAL_ERROR "Fail to find brpc")
+endif()
+include_directories(${BRPC_INCLUDE_PATH})
+
+find_path(GFLAGS_INCLUDE_PATH gflags/gflags.h)
+find_library(GFLAGS_LIBRARY NAMES gflags libgflags)
+if((NOT GFLAGS_INCLUDE_PATH) OR (NOT GFLAGS_LIBRARY))
+    message(FATAL_ERROR "Fail to find gflags")
+endif()
+include_directories(${GFLAGS_INCLUDE_PATH})
+
+execute_process(
+    COMMAND bash -c "grep \"namespace [_A-Za-z0-9]\\+ {\" ${GFLAGS_INCLUDE_PATH}/gflags/gflags_declare.h | head -1 | awk '{print $2}' | tr -d '\n'"
+    OUTPUT_VARIABLE GFLAGS_NS
+)
+if(${GFLAGS_NS} STREQUAL "GFLAGS_NAMESPACE")
+    execute_process(
+        COMMAND bash -c "grep \"#define GFLAGS_NAMESPACE [_A-Za-z0-9]\\+\" ${GFLAGS_INCLUDE_PATH}/gflags/gflags_declare.h | head -1 | awk '{print $3}' | tr -d '\n'"
+        OUTPUT_VARIABLE GFLAGS_NS
+    )
+endif()
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    include(CheckFunctionExists)
+    CHECK_FUNCTION_EXISTS(clock_gettime HAVE_CLOCK_GETTIME)
+    if(NOT HAVE_CLOCK_GETTIME)
+        set(DEFINE_CLOCK_GETTIME "-DNO_CLOCK_GETTIME_IN_MAC")
+    endif()
+endif()
+
+set(CMAKE_CPP_FLAGS "${DEFINE_CLOCK_GETTIME} -DGFLAGS_NS=${GFLAGS_NS}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CPP_FLAGS} -DNDEBUG -O2 -D__const__= -pipe -W -Wall -Wno-unused-parameter -fPIC -fno-omit-frame-pointer")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DBRPC_ENABLE_CPU_PROFILER")
+
+if(CMAKE_VERSION VERSION_LESS "3.1.3")
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    endif()
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    endif()
+else()
+    set(CMAKE_CXX_STANDARD 11)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+endif()
+
+find_path(LEVELDB_INCLUDE_PATH NAMES leveldb/db.h)
+find_library(LEVELDB_LIB NAMES leveldb)
+if ((NOT LEVELDB_INCLUDE_PATH) OR (NOT LEVELDB_LIB))
+    message(FATAL_ERROR "Fail to find leveldb")
+endif()
+include_directories(${LEVELDB_INCLUDE_PATH})
+
+find_library(SSL_LIB NAMES ssl)
+if (NOT SSL_LIB)
+    message(FATAL_ERROR "Fail to find ssl")
+endif()
+
+find_library(CRYPTO_LIB NAMES crypto)
+if (NOT CRYPTO_LIB)
+    message(FATAL_ERROR "Fail to find crypto")
+endif()
+
+set(DYNAMIC_LIB
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${GFLAGS_LIBRARY}
+    ${PROTOBUF_LIBRARIES}
+    ${LEVELDB_LIB}
+    ${SSL_LIB}
+    ${CRYPTO_LIB}
+    dl
+    )
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    set(DYNAMIC_LIB ${DYNAMIC_LIB}
+        pthread
+        "-framework CoreFoundation"
+        "-framework CoreGraphics"
+        "-framework CoreData"
+        "-framework CoreText"
+        "-framework Security"
+        "-framework Foundation"
+        "-Wl,-U,_MallocExtension_ReleaseFreeMemory"
+        "-Wl,-U,_ProfilerStart"
+        "-Wl,-U,_ProfilerStop"
+        "-Wl,-U,_RegisterThriftProtocol")
+endif()
+
+add_executable(server server.cpp ${PROTO_SRC} ${PROTO_HEADER} )
+add_executable(client client.cpp ${PROTO_SRC} ${PROTO_HEADER})
+
+target_link_libraries(server ${BRPC_LIB} ${DYNAMIC_LIB} ${GPERFTOOLS_LIBRARIES})
+target_link_libraries(client ${BRPC_LIB} ${DYNAMIC_LIB} ${GPERFTOOLS_LIBRARIES})

example/grpc_c++/client.cpp

+// Copyright (c) 2014 Baidu, Inc.
+// 
+// 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.
+
+// A client sending requests to server every 1 second.
+
+#include <gflags/gflags.h>
+#include <butil/logging.h>
+#include <butil/time.h>
+#include <brpc/channel.h>
+#include "helloworld.pb.h"
+
+DEFINE_string(attachment, "foo", "Carry this along with requests");
+DEFINE_string(protocol, "grpc", "Protocol type. Defined in src/brpc/options.proto");
+DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
+DEFINE_string(load_balancer, "", "The algorithm for load balancing");
+DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
+DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)"); 
+DEFINE_int32(interval_ms, 1000, "Milliseconds between consecutive requests");
+DEFINE_string(http_content_type, "application/json", "Content type of http request");
+
+int main(int argc, char* argv[]) {
+    // Parse gflags. We recommend you to use gflags as well.
+    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
+    
+    // A Channel represents a communication line to a Server. Notice that 
+    // Channel is thread-safe and can be shared by all threads in your program.
+    brpc::Channel channel;
+    
+    // Initialize the channel, NULL means using default options.
+    brpc::ChannelOptions options;
+    options.protocol = FLAGS_protocol;
+    options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;
+    options.max_retry = FLAGS_max_retry;
+    if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options) != 0) {
+        LOG(ERROR) << "Fail to initialize channel";
+        return -1;
+    }
+
+    // Normally, you should not call a Channel directly, but instead construct
+    // a stub Service wrapping it. stub can be shared by all threads as well.
+    helloworld::Greeter_Stub stub(&channel);
+
+    // Send a request and wait for the response every 1 second.
+    int log_id = 0;
+    //while (!brpc::IsAskedToQuit()) {
+        // We will receive response synchronously, safe to put variables
+        // on stack.
+        helloworld::HelloRequest request;
+        helloworld::HelloReply response;
+        brpc::Controller cntl;
+
+        request.set_name("zjs's world");
+
+        cntl.set_log_id(log_id ++);  // set by user
+        if (FLAGS_protocol != "http" && FLAGS_protocol != "h2c" &&
+                FLAGS_protocol != "grpc")  {
+            // Set attachment which is wired to network directly instead of 
+            // being serialized into protobuf messages.
+            cntl.request_attachment().append(FLAGS_attachment);
+        } else {
+            //cntl.http_request().set_content_type(FLAGS_http_content_type);
+        }
+
+        // Because `done'(last parameter) is NULL, this function waits until
+        // the response comes back or error occurs(including timedout).
+        stub.SayHello(&cntl, &request, &response, NULL);
+        if (!cntl.Failed()) {
+            LOG(INFO) << "Received response from " << cntl.remote_side()
+                << " to " << cntl.local_side()
+                << ": " << response.message() << " (attached="
+                << cntl.response_attachment() << ")"
+                << " latency=" << cntl.latency_us() << "us";
+        } else {
+            LOG(WARNING) << cntl.ErrorText();
+        }
+        //usleep(FLAGS_interval_ms * 1000L);
+    //}
+
+    return 0;
+}

example/grpc_c++/grpc_client.cpp

+/*
+ *
+ * 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 <fstream>
+
+#include <grpcpp/grpcpp.h>
+
+#include "helloworld.pb.h"
+
+using grpc::Channel;
+using grpc::ClientContext;
+using grpc::Status;
+using helloworld::HelloRequest;
+using helloworld::HelloReply;
+using helloworld::Greeter;
+
+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) {
+    // Data we are sending to the server.
+    HelloRequest request;
+    request.set_name(user);
+    request.set_sex("1234");
+    std::fstream output("out", std::ios::out | std::ios::trunc | std::ios::binary);
+    request.SerializeToOstream(&output);
+    //output.close();
+
+    std::fstream input("out", std::ios::in | std::ios::binary);
+    HelloRequest request_in;
+    request_in.ParseFromIstream(&input);
+    std::cout << "name=" << request_in.name() << ", sex=" << request_in.sex();
+    //input.close();
+
+    // 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) {
+  // Instantiate the client. It requires a channel, out of which the actual RPCs
+  // are created. This channel models a connection to an endpoint (in this case,
+  // localhost at port 50051). We indicate that the channel isn't authenticated
+  // (use of InsecureChannelCredentials()).
+  GreeterClient greeter(grpc::CreateChannel(
+      "localhost:8010", grpc::InsecureChannelCredentials()));
+  std::string user("world");
+  std::string reply = greeter.SayHello(user);
+  std::cout << "Greeter received: " << reply << std::endl;
+
+  return 0;
+}

example/grpc_c++/helloworld.proto

+syntax = "proto3";
+
+package helloworld;
+
+option cc_generic_services = true;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}

example/grpc_c++/server.cpp

+// Copyright (c) 2014 Baidu, Inc.
+//
+// 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.
+
+// A server to receive HttpRequest and send back HttpResponse.
+
+#include <gflags/gflags.h>
+#include <butil/logging.h>
+#include <brpc/server.h>
+#include <brpc/restful.h>
+#include "helloworld.pb.h"
+
+DEFINE_int32(port, 8010, "TCP Port of this server");
+DEFINE_int32(idle_timeout_s, -1, "Connection will be closed if there is no "
+             "read/write operations during the last `idle_timeout_s'");
+DEFINE_int32(logoff_ms, 2000, "Maximum duration of server's LOGOFF state "
+             "(waiting for client to close connection before server stops)");
+
+// Service with static path.
+using helloworld::HelloRequest;
+using helloworld::HelloReply;
+
+class HttpServiceImpl : public helloworld::Greeter {
+public:
+    HttpServiceImpl() {};
+    virtual ~HttpServiceImpl() {};
+    void SayHello(google::protobuf::RpcController* cntl_base,
+                 const HelloRequest* req,
+                 HelloReply* res,
+                 google::protobuf::Closure* done) {
+        brpc::ClosureGuard done_guard(done);
+
+        brpc::Controller* cntl = static_cast<brpc::Controller*>(cntl_base);
+        std::string prefix("Hello ");
+        LOG(INFO) << "req=" << req->name();
+        res->set_message(prefix + req->name());
+    }
+};
+
+int main(int argc, char* argv[]) {
+    // Parse gflags. We recommend you to use gflags as well.
+    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
+
+    // Generally you only need one Server.
+    brpc::Server server;
+
+    HttpServiceImpl http_svc;
+
+    // Add services into server. Notice the second parameter, because the
+    // service is put on stack, we don't want server to delete it, otherwise
+    // use brpc::SERVER_OWNS_SERVICE.
+    if (server.AddService(&http_svc,
+                          brpc::SERVER_DOESNT_OWN_SERVICE) != 0) {
+        LOG(ERROR) << "Fail to add http_svc";
+        return -1;
+    }
+
+    // Start the server.
+    brpc::ServerOptions options;
+    options.idle_timeout_sec = FLAGS_idle_timeout_s;
+    if (server.Start(FLAGS_port, &options) != 0) {
+        LOG(ERROR) << "Fail to start HttpServer";
+        return -1;
+    }
+
+    // Wait until Ctrl-C is pressed, then Stop() and Join() the server.
+    server.RunUntilAskedToQuit();
+    return 0;
+}