server.cpp 4.37 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
gejun's avatar
gejun committed
17 18 19 20

// A server sleeping for even-th requests to trigger backup request of client.

#include <gflags/gflags.h>
21
#include <butil/logging.h>
gejun's avatar
gejun committed
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
#include <brpc/server.h>
#include "echo.pb.h"

DEFINE_bool(echo_attachment, true, "Echo attachment as well");
DEFINE_int32(port, 8000, "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)");
DEFINE_int32(sleep_ms, 20, "Sleep so many milliseconds on even-th requests");

// Your implementation of example::EchoService
// Notice that implementing brpc::Describable grants the ability to put
// additional information in /status.
namespace example {
class SleepyEchoService : public EchoService
38
                        , public brpc::Describable {
gejun's avatar
gejun committed
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
public:
    SleepyEchoService() : _count(0) {};
    virtual ~SleepyEchoService() {};
    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);

        // The purpose of following logs is to help you to understand
        // how clients interact with servers more intuitively. You should 
        // remove these logs in performance-sensitive servers.
        // The noflush prevents the log from being flushed immediately.
        LOG(INFO) << "Received request[index=" << request->index()
                  << "] from " << cntl->remote_side() 
                  << " to " << cntl->local_side() << noflush;
        // Sleep a while for 0th, 2nd, 4th, 6th ... requests to trigger backup request
        // at client-side.
62
        bool do_sleep = (_count.fetch_add(1, butil::memory_order_relaxed) % 2 == 0);
gejun's avatar
gejun committed
63 64 65 66 67 68 69 70 71 72 73 74 75 76
        if (do_sleep) {
            LOG(INFO) << ", sleep " << FLAGS_sleep_ms 
                      << " ms to trigger backup request" << noflush;
        }
        LOG(INFO);

        // Fill response.
        response->set_index(request->index());

        if (do_sleep) {
            bthread_usleep(FLAGS_sleep_ms * 1000);
        }
    }
private:
77
    butil::atomic<int> _count;
gejun's avatar
gejun committed
78 79 80 81 82
};
}  // namespace example

int main(int argc, char* argv[]) {
    // Parse gflags. We recommend you to use gflags as well.
83
    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
gejun's avatar
gejun committed
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111

    // Generally you only need one Server.
    brpc::Server server;

    // Instance of your service.
    example::SleepyEchoService echo_service_impl;

    // Add the service 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(&echo_service_impl, 
                          brpc::SERVER_DOESNT_OWN_SERVICE) != 0) {
        LOG(ERROR) << "Fail to add service";
        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 EchoServer";
        return -1;
    }

    // Wait until Ctrl-C is pressed, then Stop() and Join() the server.
    server.RunUntilAskedToQuit();
    return 0;
}