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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zenhorde/hordeclient.h>
#include <zencore/logbase.h>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <memory>
#include <system_error>
namespace asio {
class io_context;
}
namespace zen::horde {
/** Handler types for async transport operations. */
using AsyncConnectHandler = std::function<void(const std::error_code&)>;
using AsyncIoHandler = std::function<void(const std::error_code&, size_t)>;
/** Abstract base for asynchronous compute transports.
*
* All callbacks are invoked on the io_context that was provided at construction.
* Callers are responsible for strand serialization if needed.
*/
class AsyncComputeTransport
{
public:
virtual ~AsyncComputeTransport() = default;
virtual bool IsValid() const = 0;
/** Asynchronous write of exactly Size bytes. Handler called on completion or error. */
virtual void AsyncWrite(const void* Data, size_t Size, AsyncIoHandler Handler) = 0;
/** Asynchronous read of exactly Size bytes into Data. Handler called on completion or error. */
virtual void AsyncRead(void* Data, size_t Size, AsyncIoHandler Handler) = 0;
virtual void Close() = 0;
};
/** Async TCP transport using ASIO.
*
* Connects to the Horde compute endpoint and provides async send/receive.
* The socket is created on a caller-provided io_context (shared across agents).
*/
class AsyncTcpComputeTransport final : public AsyncComputeTransport
{
public:
/** Construct a transport on the given io_context. Does not connect yet. */
explicit AsyncTcpComputeTransport(asio::io_context& IoContext);
~AsyncTcpComputeTransport() override;
/** Asynchronously connect to the endpoint and send the nonce. */
void AsyncConnect(const MachineInfo& Info, AsyncConnectHandler Handler);
bool IsValid() const override;
void AsyncWrite(const void* Data, size_t Size, AsyncIoHandler Handler) override;
void AsyncRead(void* Data, size_t Size, AsyncIoHandler Handler) override;
void Close() override;
private:
LoggerRef Log() { return m_Log; }
struct Impl;
std::unique_ptr<Impl> m_Impl;
LoggerRef m_Log;
bool m_IsClosed = false;
bool m_HasErrors = false;
};
} // namespace zen::horde
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