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				|  |  | +/*
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				|  |  | + *
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				|  |  | + * Copyright 2015, Google Inc.
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				|  |  | + * All rights reserved.
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				|  |  | + *
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				|  |  | + * Redistribution and use in source and binary forms, with or without
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				|  |  | + * modification, are permitted provided that the following conditions are
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				|  |  | + * met:
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				|  |  | + *
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				|  |  | + *     * Redistributions of source code must retain the above copyright
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				|  |  | + * notice, this list of conditions and the following disclaimer.
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				|  |  | + *     * Redistributions in binary form must reproduce the above
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				|  |  | + * copyright notice, this list of conditions and the following disclaimer
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				|  |  | + * in the documentation and/or other materials provided with the
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				|  |  | + * distribution.
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				|  |  | + *     * Neither the name of Google Inc. nor the names of its
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				|  |  | + * contributors may be used to endorse or promote products derived from
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				|  |  | + * this software without specific prior written permission.
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				|  |  | + *
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				|  |  | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | + *
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				|  |  | + */
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				|  |  | +
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				|  |  | +#include <memory>
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				|  |  | +#include <sstream>
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				|  |  | +#include <thread>
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				|  |  | +
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				|  |  | +#include <signal.h>
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				|  |  | +#include <unistd.h>
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				|  |  | +
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				|  |  | +#include <gflags/gflags.h>
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				|  |  | +#include <grpc/grpc.h>
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				|  |  | +#include <grpc/support/log.h>
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				|  |  | +#include <grpc++/config.h>
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				|  |  | +#include <grpc++/server.h>
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				|  |  | +#include <grpc++/server_builder.h>
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				|  |  | +#include <grpc++/server_context.h>
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				|  |  | +#include <grpc++/server_credentials.h>
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				|  |  | +#include <grpc++/status.h>
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				|  |  | +#include <grpc++/stream.h>
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				|  |  | +#include "test/core/util/reconnect_server.h"
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				|  |  | +#include "test/cpp/util/test_config.h"
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				|  |  | +#include "test/proto/test.grpc.pb.h"
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				|  |  | +#include "test/proto/empty.grpc.pb.h"
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				|  |  | +#include "test/proto/messages.grpc.pb.h"
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				|  |  | +
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				|  |  | +DEFINE_int32(control_port, 0, "Server port for controlling the server.");
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				|  |  | +DEFINE_int32(retry_port, 0,
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				|  |  | +             "Server port for raw tcp connections. All incoming "
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				|  |  | +             "connections will be closed immediately.");
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				|  |  | +
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				|  |  | +using grpc::Server;
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				|  |  | +using grpc::ServerBuilder;
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				|  |  | +using grpc::ServerContext;
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				|  |  | +using grpc::ServerCredentials;
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				|  |  | +using grpc::ServerReader;
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				|  |  | +using grpc::ServerReaderWriter;
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				|  |  | +using grpc::ServerWriter;
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				|  |  | +using grpc::SslServerCredentialsOptions;
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				|  |  | +using grpc::Status;
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				|  |  | +using grpc::testing::Empty;
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				|  |  | +using grpc::testing::ReconnectService;
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				|  |  | +using grpc::testing::ReconnectInfo;
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				|  |  | +
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				|  |  | +static bool got_sigint = false;
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				|  |  | +
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				|  |  | +class ReconnectServiceImpl : public ReconnectService::Service {
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				|  |  | + public:
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				|  |  | +  explicit ReconnectServiceImpl(int retry_port) : retry_port_(retry_port) {
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				|  |  | +    reconnect_server_init(&tcp_server_);
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				|  |  | +  }
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				|  |  | +
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				|  |  | +  ~ReconnectServiceImpl() {
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				|  |  | +    if (tcp_server_.tcp_server) {
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				|  |  | +      reconnect_server_destroy(&tcp_server_);
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				|  |  | +    }
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				|  |  | +  }
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				|  |  | +
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				|  |  | +  void Poll(int seconds) { reconnect_server_poll(&tcp_server_, seconds); }
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				|  |  | +
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				|  |  | +  Status Start(ServerContext* context, const Empty* request, Empty* response) {
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				|  |  | +    if (!tcp_server_.tcp_server) {
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				|  |  | +      reconnect_server_start(&tcp_server_, retry_port_);
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				|  |  | +    } else {
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				|  |  | +      reconnect_server_clear_timestamps(&tcp_server_);
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				|  |  | +    }
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				|  |  | +    return Status::OK;
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				|  |  | +  }
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				|  |  | +
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				|  |  | +  Status Stop(ServerContext* context, const Empty* request,
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				|  |  | +              ReconnectInfo* response) {
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				|  |  | +    // extract timestamps and set response
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				|  |  | +    Verify(response);
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				|  |  | +    reconnect_server_clear_timestamps(&tcp_server_);
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				|  |  | +    return Status::OK;
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				|  |  | +  }
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				|  |  | +
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				|  |  | +  void Verify(ReconnectInfo* response) {
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				|  |  | +    double expected_backoff = 1000.0;
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				|  |  | +    const double kTransmissionDelay = 100.0;
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				|  |  | +    const double kBackoffMultiplier = 1.6;
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				|  |  | +    const double kJitterFactor = 0.2;
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				|  |  | +    const int kMaxBackoffMs = 120 * 1000;
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				|  |  | +    bool passed = true;
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				|  |  | +    for (timestamp_list* cur = tcp_server_.head; cur && cur->next;
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				|  |  | +         cur = cur->next) {
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				|  |  | +      double backoff = gpr_time_to_millis(
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				|  |  | +          gpr_time_sub(cur->next->timestamp, cur->timestamp));
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				|  |  | +      double min_backoff = expected_backoff * (1 - kJitterFactor);
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				|  |  | +      double max_backoff = expected_backoff * (1 + kJitterFactor);
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				|  |  | +      if (backoff < min_backoff - kTransmissionDelay ||
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				|  |  | +          backoff > max_backoff + kTransmissionDelay) {
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				|  |  | +        passed = false;
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				|  |  | +      }
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				|  |  | +      response->add_backoff_ms(static_cast<gpr_int32>(backoff));
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				|  |  | +      expected_backoff *= kBackoffMultiplier;
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				|  |  | +      expected_backoff =
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				|  |  | +          expected_backoff > kMaxBackoffMs ? kMaxBackoffMs : expected_backoff;
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				|  |  | +    }
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				|  |  | +    response->set_passed(passed);
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				|  |  | +  }
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				|  |  | +
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				|  |  | + private:
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				|  |  | +  int retry_port_;
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				|  |  | +  reconnect_server tcp_server_;
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				|  |  | +};
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				|  |  | +
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				|  |  | +void RunServer() {
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				|  |  | +  std::ostringstream server_address;
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				|  |  | +  server_address << "0.0.0.0:" << FLAGS_control_port;
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				|  |  | +  ReconnectServiceImpl service(FLAGS_retry_port);
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				|  |  | +
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				|  |  | +  ServerBuilder builder;
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				|  |  | +  builder.RegisterService(&service);
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				|  |  | +  builder.AddListeningPort(server_address.str(),
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				|  |  | +                           grpc::InsecureServerCredentials());
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				|  |  | +  std::unique_ptr<Server> server(builder.BuildAndStart());
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				|  |  | +  gpr_log(GPR_INFO, "Server listening on %s", server_address.str().c_str());
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				|  |  | +  while (!got_sigint) {
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				|  |  | +    service.Poll(5);
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				|  |  | +  }
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				|  |  | +}
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				|  |  | +
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				|  |  | +static void sigint_handler(int x) { got_sigint = true; }
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				|  |  | +
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				|  |  | +int main(int argc, char** argv) {
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				|  |  | +  grpc::testing::InitTest(&argc, &argv, true);
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				|  |  | +  signal(SIGINT, sigint_handler);
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				|  |  | +
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				|  |  | +  GPR_ASSERT(FLAGS_control_port != 0);
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				|  |  | +  GPR_ASSERT(FLAGS_retry_port != 0);
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				|  |  | +  RunServer();
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				|  |  | +
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				|  |  | +  return 0;
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				|  |  | +}
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