/*
 * 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
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#ifndef PAGESPEED_CONTROLLER_GRPC_SERVER_TEST_H_
#define PAGESPEED_CONTROLLER_GRPC_SERVER_TEST_H_

#include <memory>

#include "pagespeed/kernel/base/function.h"
#include "pagespeed/kernel/base/gtest.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/thread.h"
#include "pagespeed/kernel/base/thread_system.h"
#include "pagespeed/kernel/util/grpc.h"

namespace net_instaweb {

// Fixture for testing gRPC servers. Contains an event dispatcher thread, plus
// some other bits you'll need.
class GrpcServerTest : public testing::Test {
 public:
  GrpcServerTest();
  virtual ~GrpcServerTest();

  // Binds server_ to the address returned by ListenAddress().
  void SetUp() override;

  // Blocks until server_ is stopped.
  void StopServer();

  // Have the server thread call Run() (never Cancel()) on the supplied
  // function, ASAP. This call is thread-safe.
  void QueueFunctionForServerThread(Function* func);

  GoogleString ServerAddress() const;

 protected:
  // Holder for various pieces of a client connection.
  class BaseClientConnection {
   public:
    BaseClientConnection(const GoogleString& address)
        : channel_(::grpc::CreateChannel(
              address, ::grpc::InsecureChannelCredentials())) {
    }

    ::grpc::ClientContext client_ctx_;
    std::shared_ptr<::grpc::Channel> channel_;
  };

  std::unique_ptr<ThreadSystem> thread_system_;
  std::unique_ptr<::grpc::ServerCompletionQueue> queue_;

 private:
  class GrpcServerThread : public ThreadSystem::Thread {
   public:
    GrpcServerThread(::grpc::CompletionQueue* queue,
                     ThreadSystem* thread_system);
    virtual ~GrpcServerThread();
    void Stop();

   private:
    void Run() override;

    ::grpc::CompletionQueue* queue_;
  };

  // Override this to call RegisterService on the ServerBuilder.
  virtual void RegisterServices(::grpc::ServerBuilder*) = 0;

  std::unique_ptr<GrpcServerThread> server_thread_;
  std::unique_ptr<::grpc::Server> server_;
};

}  // namespace net_instaweb

#endif  // PAGESPEED_CONTROLLER_GRPC_SERVER_TEST_H_