//
//
// Copyright 2016 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 GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_SERVER_CHTTP2_SERVER_H
#define GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_SERVER_CHTTP2_SERVER_H

#include <functional>

#include <grpc/passive_listener.h>
#include <grpc/support/port_platform.h>

#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/server/server.h"

namespace grpc_core {

// A function to modify channel args for a listening addr:port. Note that this
// is used to create a security connector for listeners when the servers are
// configured with a config fetcher. Not invoked if there is no config fetcher
// added to the server. On failure, the error parameter will be set.
using Chttp2ServerArgsModifier =
    std::function<ChannelArgs(const ChannelArgs&, grpc_error_handle*)>;

/// Adds a port to \a server.  Sets \a port_num to the port number.
/// Takes ownership of \a args.
grpc_error_handle Chttp2ServerAddPort(
    Server* server, const char* addr, const ChannelArgs& args,
    Chttp2ServerArgsModifier connection_args_modifier, int* port_num);

class Chttp2ServerListener;
namespace experimental {

// An implementation of the public C++ passive listener interface.
// The server builder holds a weak_ptr to one of these objects, and the
// application owns the instance.
class PassiveListenerImpl final : public PassiveListener {
 public:
  absl::Status AcceptConnectedEndpoint(
      std::unique_ptr<grpc_event_engine::experimental::EventEngine::Endpoint>
          endpoint) override ABSL_LOCKS_EXCLUDED(mu_);

  absl::Status AcceptConnectedFd(GRPC_UNUSED int fd) override
      ABSL_LOCKS_EXCLUDED(mu_);

  void ListenerDestroyed() ABSL_LOCKS_EXCLUDED(mu_);

 private:
  // note: the grpc_core::Server redundant namespace qualification is
  // required for older gcc versions.
  friend absl::Status(::grpc_server_add_passive_listener)(
      grpc_core::Server* server, grpc_server_credentials* credentials,
      std::shared_ptr<grpc_core::experimental::PassiveListenerImpl>
          passive_listener);

  Mutex mu_;
  // Data members will be populated when initialized.
  RefCountedPtr<Server> server_;
  Chttp2ServerListener* listener_;
};

}  // namespace experimental
}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_SERVER_CHTTP2_SERVER_H
