wire_stream_with_recv.h

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// Copyright 2026 The A11 Authors.
 
#ifndef A11_NET_WIRE_STREAM_WITH_RECV_H_
#define A11_NET_WIRE_STREAM_WITH_RECV_H_
 
#include <memory>
#include <optional>
#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/data/types.h"
#include "a11/net/wire_stream.h"
 
namespace a11::net {
 
class WireStreamWithRecv final
    : public WireStream,
      public std::enable_shared_from_this<WireStreamWithRecv> {
 private:
  struct State;
 
  struct ConstructorToken {};
 
 public:
  static absl::StatusOr<std::shared_ptr<WireStreamWithRecv>> Create(
      std::shared_ptr<WireStream> stream);
 
  using WireStream::HalfClose;
  using WireStream::SetDeadline;
 
  absl::Status Send(data::WireMessage message) override;
  a11::Task Start(OnMessage on_message, OnDone on_done) override;
  a11::Task Accept(OnMessage on_message, OnDone on_done) override;
  a11::Task Start();
  a11::Task Accept();
  absl::Status HalfClose(data::ByteMap trailers) override;
  a11::Task DrainOutgoingMessages() override;
  absl::Status Abort(absl::Status status) override;
  absl::Status SetDeadline(absl::Time deadline) override;
 
  [[nodiscard]] absl::Time deadline() const override;
  [[nodiscard]] absl::Status GetStatus() const override;
  [[nodiscard]] std::optional<data::ByteMap> GetTrailers() const override;
  [[nodiscard]] std::string GetId() const override;
  [[nodiscard]] void* absl_nullable GetImpl() const override;
 
  a11::Future<std::optional<data::WireMessage>> Receive(
      absl::Duration timeout = absl::InfiniteDuration());
 
  [[nodiscard]] std::shared_ptr<WireStream> wrapped_stream() const {
    return stream_;
  }
 
  WireStreamWithRecv(ConstructorToken, std::shared_ptr<WireStream> stream,
                     std::string id, std::shared_ptr<State> state)
      : stream_(std::move(stream)),
        id_(std::move(id)),
        state_(std::move(state)) {}
 
 private:
  a11::Task StartImpl(bool accept, OnMessage on_message, OnDone on_done);
  a11::Task HandleMessage(OnMessage observer,
                          std::optional<data::WireMessage> message);
  a11::Task HandleDone(OnDone observer);
  void RecordCurrentStatus() const;
  void SignalError(absl::Status status) const;
 
  std::shared_ptr<WireStream> stream_;
  std::string id_;
  std::shared_ptr<State> state_;
};
 
}  // namespace a11::net
 
#endif  // A11_NET_WIRE_STREAM_WITH_RECV_H_