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// SPDX-License-Identifier: CC0-1.0
#pragma once
#include <cstddef>
#include <list>
#include <memory>
#include <string>
#include <string_view>
#include <enet/enet.h>
#include "Common/CommonTypes.h"
#include "Common/ENet.h"
#include "Common/TraversalProto.h"
namespace Common
{
class TraversalClientClient
{
public:
virtual ~TraversalClientClient() = default;
virtual void OnTraversalStateChanged() = 0;
virtual void OnConnectReady(ENetAddress addr) = 0;
virtual void OnConnectFailed(TraversalConnectFailedReason reason) = 0;
virtual void OnTtlDetermined(u8 ttl) = 0;
};
class TraversalClient
{
public:
enum class State
{
Connecting,
Connected,
Failure,
};
enum class FailureReason
{
BadHost = 0x300,
VersionTooOld,
ServerForgotAboutUs,
SocketSendError,
ResendTimeout,
};
TraversalClient(ENetHost* netHost, const std::string& server, const u16 port,
const u16 port_alt = 0);
~TraversalClient();
TraversalHostId GetHostID() const;
TraversalInetAddress GetExternalAddress() const;
State GetState() const;
FailureReason GetFailureReason() const;
bool HasFailed() const { return m_State == State::Failure; }
bool IsConnecting() const { return m_State == State::Connecting; }
bool IsConnected() const { return m_State == State::Connected; }
void Reset();
void ConnectToClient(std::string_view host);
void ReconnectToServer();
void Update();
void HandleResends();
TraversalClientClient* m_Client = nullptr;
private:
struct OutgoingTraversalPacketInfo
{
TraversalPacket packet;
int tries;
u32 sendTime;
};
void HandleServerPacket(TraversalPacket* packet);
// called from NetHost
bool TestPacket(u8* data, size_t size, ENetAddress* from);
void ResendPacket(OutgoingTraversalPacketInfo* info);
TraversalRequestId SendTraversalPacket(const TraversalPacket& packet);
void OnFailure(FailureReason reason);
void HandlePing();
static int ENET_CALLBACK InterceptCallback(ENetHost* host, ENetEvent* event);
void NewTraversalTest();
void HandleTraversalTest();
ENetHost* m_NetHost;
TraversalHostId m_HostId{};
TraversalInetAddress m_external_address{};
State m_State{};
FailureReason m_FailureReason{};
TraversalRequestId m_ConnectRequestId = 0;
bool m_PendingConnect = false;
std::list<OutgoingTraversalPacketInfo> m_OutgoingTraversalPackets;
ENetAddress m_ServerAddress{};
std::string m_Server;
u16 m_port;
u16 m_portAlt;
u32 m_PingTime = 0;
ENetSocket m_TestSocket = ENET_SOCKET_NULL;
TraversalRequestId m_TestRequestId = 0;
u8 m_ttl = 2;
bool m_ttlReady = false;
};
extern std::unique_ptr<TraversalClient> g_TraversalClient;
// the NetHost connected to the TraversalClient.
extern ENet::ENetHostPtr g_MainNetHost;
// Create g_TraversalClient and g_MainNetHost if necessary.
bool EnsureTraversalClient(const std::string& server, u16 server_port, u16 server_port_alt = 0,
u16 listen_port = 0);
void ReleaseTraversalClient();
} // namespace Common
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