/*
 *
 * Copyright 2019 gRPC authors.
 *
 * Licensed 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.
 *
 */

#ifndef SRC_CPP_SERVER_EXTERNAL_CONNECTION_ACCEPTOR_IMPL_H_
#define SRC_CPP_SERVER_EXTERNAL_CONNECTION_ACCEPTOR_IMPL_H_

#include <memory>
#include <mutex>

#include <grpc/impl/codegen/grpc_types.h>
#include <grpcpp/security/server_credentials.h>
#include <grpcpp/security/server_credentials_impl.h>
#include <grpcpp/server_builder.h>
#include <grpcpp/support/channel_arguments.h>

#include "src/core/lib/iomgr/tcp_server.h"

namespace grpc {
namespace internal {

class ExternalConnectionAcceptorImpl
    : public std::enable_shared_from_this<ExternalConnectionAcceptorImpl> {
 public:
  ExternalConnectionAcceptorImpl(
      const grpc::string& name,
      ServerBuilder::experimental_type::ExternalConnectionType type,
      std::shared_ptr<ServerCredentials> creds);
  // Should only be called once.
  std::unique_ptr<experimental::ExternalConnectionAcceptor> GetAcceptor();

  void HandleNewConnection(
      experimental::ExternalConnectionAcceptor::NewConnectionParameters* p);

  void Shutdown();

  void Start();

  const char* name() { return name_.c_str(); }

  ServerCredentials* GetCredentials() { return creds_.get(); }

  void SetToChannelArgs(::grpc::ChannelArguments* args);

 private:
  const grpc::string name_;
  std::shared_ptr<ServerCredentials> creds_;
  grpc_core::TcpServerFdHandler* handler_ = nullptr;  // not owned
  std::mutex mu_;
  bool has_acceptor_ = false;
  bool started_ = false;
  bool shutdown_ = false;
};

}  // namespace internal
}  // namespace grpc

#endif  // SRC_CPP_SERVER_EXTERNAL_CONNECTION_ACCEPTOR_IMPL_H_