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