server.h

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// Copyright 2025 Google LLC
//
// 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 ACTIONENGINE_NET_WEBRTC_SERVER_H_
#define ACTIONENGINE_NET_WEBRTC_SERVER_H_
 
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
 
#include <absl/base/nullability.h>
#include <absl/base/thread_annotations.h>
#include <absl/container/flat_hash_map.h>
#include <absl/status/status.h>
 
#include "actionengine/concurrency/concurrency.h"
#include "actionengine/net/webrtc/signalling_client.h"
#include "actionengine/net/webrtc/wire_stream.h"
#include "actionengine/service/service.h"

 
namespace act::net {

class WebRtcServer {
 public:
  explicit WebRtcServer(act::Service* absl_nonnull service,
                        std::string_view address = "0.0.0.0",
                        uint16_t port = 20000,
                        std::string_view signalling_address = "localhost",
                        uint16_t signalling_port = 80,
                        std::string_view signalling_identity = "server",
                        std::optional<RtcConfig> rtc_config = std::nullopt);
 
  ~WebRtcServer();

  void Run();

  absl::Status Cancel();

  absl::Status Join();
 
 private:
  using DataChannelConnectionMap =
      absl::flat_hash_map<std::string, WebRtcDataChannelConnection>;
  void RunLoop() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_);
 
  absl::Status CancelInternal() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_);
  absl::Status JoinInternal() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_);
 
  std::shared_ptr<SignallingClient> InitSignallingClient(
      std::string_view signalling_address, uint16_t signalling_port,
      DataChannelConnectionMap* absl_nonnull connections);
 
  act::Service* absl_nonnull const service_;
 
  const std::string address_;
  const uint16_t port_;
  const std::string signalling_address_;
  const uint16_t signalling_port_;
  const std::string signalling_identity_;
  const std::optional<RtcConfig> rtc_config_;
 
  thread::Channel<absl::StatusOr<WebRtcDataChannelConnection>>
      ready_data_connections_;
  act::Mutex mu_;
  std::unique_ptr<thread::Fiber> main_loop_;
};
 
}  // namespace act::net
 
#endif  // ACTIONENGINE_NET_WEBRTC_SERVER_H_