brpc 使用压缩方式传递数据

brpc 是支持压缩方式传递数据的，支持的压缩格式有四种：

  COMPRESS_TYPE_SNAPPY = 1,
  COMPRESS_TYPE_GZIP = 2,
  COMPRESS_TYPE_ZLIB = 3,
  COMPRESS_TYPE_LZ4 = 4

brpc 的请求和响应都支持压缩

• set_request_compress_type()
• set_response_compress_type()

example

• 请求

int main(int argc, char* argv[]) {
    // Parse gflags. We recommend you to use gflags as well.
    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
    if (FLAGS_gzip) {
        GFLAGS_NS::SetCommandLineOption("http_body_compress_threshold", 0);
    }
    
    // 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;
    }

    helloworld::Greeter_Stub stub(&channel);

    // Send a request and wait for the response every 1 second.
    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("grpc_req_from_brpc");

        // 这条语句用与设置请求压缩格式，解压的时候不用关心，brpc会自动处理
        cntl.set_request_compress_type(brpc::COMPRESS_TYPE_GZIP);
        
        stub.SayHello(&cntl, &request, &response, NULL);
        if (!cntl.Failed()) {
            LOG(INFO) << "Received response from " << cntl.remote_side()
                << " to " << cntl.local_side()
                << ": " << response.message()
                << " latency=" << cntl.latency_us() << "us";
        } else {
            LOG(WARNING) << cntl.ErrorText();
        }
        usleep(FLAGS_interval_ms * 1000L);
    }

    return 0;
}

• 响应

virtual void Echo(google::protobuf::RpcController* cntl_base,
                      const EchoRequest* request,
                      EchoResponse* response,
                      google::protobuf::Closure* done) {
        // This object helps you to call done->Run() in RAII style. If you need
        // to process the request asynchronously, pass done_guard.release().
        brpc::ClosureGuard done_guard(done);

        brpc::Controller* cntl =
            static_cast<brpc::Controller*>(cntl_base);

        LOG(INFO) << "Received request[log_id=" << cntl->log_id() 
                  << "] from " << cntl->remote_side() 
                  << " to " << cntl->local_side()
                  << ": " << request->message()
                  << " (attached=" << cntl->request_attachment() << ")";

        // Fill response.
        response->set_message(request->message());

        // 这条语句用于设置响应的压缩格式
        // cntl->set_response_compress_type(brpc::COMPRESS_TYPE_GZIP);

        if (FLAGS_echo_attachment) {
            // Set attachment which is wired to network directly instead of
            // being serialized into protobuf messages.
            cntl->response_attachment().append(cntl->request_attachment());
        }
    }

资料：https://github.com/apache/incubator-brpc/blob/master/docs/cn/client.md