Initial checkin of gRPC to third_party/

third_party/grpc/test/cpp/interop/reconnect_interop_server.cc

+/*
+ *
+ * Copyright 2015-2016, 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 "src/proto/grpc/testing/test.grpc.pb.h"
+#include "src/proto/grpc/testing/empty.grpc.pb.h"
+#include "src/proto/grpc/testing/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<int32_t>(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;
+}