websocket_signalling.h

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// Copyright 2026 The A11 Authors.
 
#ifndef A11_NET_WEBSOCKET_SIGNALLING_H_
#define A11_NET_WEBSOCKET_SIGNALLING_H_
 
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
 
#include <absl/base/nullability.h>
#include <absl/status/status.h>
#include <absl/status/statusor.h>
#include <absl/time/time.h>
 
#include "a11/concurrency/future.h"
#include "a11/net/http2.h"
#include "a11/net/signalling.h"
 
namespace a11::net {
 
struct WebSocketSignallingClientOptions {
  Http2Options http2_options;  
  absl::Time deadline = absl::InfiniteFuture();  
  size_t max_message_size = 1024 * 1024;  
 
  absl::Status Validate() const;
};
 
class WebSocketSignallingClient final
    : public SignallingTransport,
      public std::enable_shared_from_this<WebSocketSignallingClient> {
 private:
  struct State;
 
  struct ConstructorToken {};
 
 public:
  static a11::Future<std::shared_ptr<WebSocketSignallingClient>> Connect(
      std::string url, std::string identity,
      OnSignallingMessage on_message = {},
      WebSocketSignallingClientOptions options = {});
 
  ~WebSocketSignallingClient() override;
 
  absl::Status Send(SignallingMessage message) override;
  absl::Status SetOnMessage(OnSignallingMessage on_message) override;
  absl::Status Close() override;
  [[nodiscard]] std::string identity() const override;
  [[nodiscard]] bool connected() const override;
  [[nodiscard]] absl::Status GetStatus() const override;
  [[nodiscard]] void* absl_nullable GetImpl() const;
 
  explicit WebSocketSignallingClient(ConstructorToken,
                                     std::shared_ptr<State> state)
      : state_(std::move(state)) {}
 
 private:
  static void Pump(const std::shared_ptr<State>& state);
  static void Fail(const std::shared_ptr<State>& state, absl::Status status);
 
  std::shared_ptr<State> state_;
};
 
struct WebSocketSignallingServerOptions {
  std::string path_prefix =
      "/";  
  std::string bind_address = "127.0.0.1";  
  std::uint16_t port = 0;  
  Http2Options http2_options;             
  size_t max_message_size = 1024 * 1024;  
 
  absl::Status Validate() const;
};
 
class WebSocketSignallingServer
    : public std::enable_shared_from_this<WebSocketSignallingServer> {
 public:
  static absl::StatusOr<std::shared_ptr<WebSocketSignallingServer>> Create(
      std::shared_ptr<SignallingService> service,
      WebSocketSignallingServerOptions options = {});
 
  ~WebSocketSignallingServer();
 
  absl::Status Stop();
  [[nodiscard]] std::uint16_t port() const;
  [[nodiscard]] bool running() const;
  [[nodiscard]] std::shared_ptr<SignallingService> service() const;
  [[nodiscard]] void* absl_nullable GetImpl() const;
 
 private:
  struct State;
 
  explicit WebSocketSignallingServer(std::shared_ptr<State> state)
      : state_(std::move(state)) {}
 
  static void Remove(const std::shared_ptr<State>& state, std::string identity);
 
  std::shared_ptr<State> state_;
};
 
}  // namespace a11::net
 
#endif  // A11_NET_WEBSOCKET_SIGNALLING_H_