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Location: cpp/openttd-patchpack/source/src/network/core/tcp.h
r25813:ea6d38b6c3a1
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text/x-c
Codechange: track servers with a ServerAddress instead of a NetworkAddress
This allows future extensions to have different ways of referencing
a server, instead of forcing to use IP:port.
This allows future extensions to have different ways of referencing
a server, instead of forcing to use IP:port.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file tcp.h Basic functions to receive and send TCP packets.
*/
#ifndef NETWORK_CORE_TCP_H
#define NETWORK_CORE_TCP_H
#include "address.h"
#include "packet.h"
#include <atomic>
#include <chrono>
#include <map>
#include <thread>
/** The states of sending the packets. */
enum SendPacketsState {
SPS_CLOSED, ///< The connection got closed.
SPS_NONE_SENT, ///< The buffer is still full, so no (parts of) packets could be sent.
SPS_PARTLY_SENT, ///< The packets are partly sent; there are more packets to be sent in the queue.
SPS_ALL_SENT, ///< All packets in the queue are sent.
};
/** Base socket handler for all TCP sockets */
class NetworkTCPSocketHandler : public NetworkSocketHandler {
private:
Packet *packet_queue; ///< Packets that are awaiting delivery
Packet *packet_recv; ///< Partially received packet
void EmptyPacketQueue();
public:
SOCKET sock; ///< The socket currently connected to
bool writable; ///< Can we write to this socket?
/**
* Whether this socket is currently bound to a socket.
* @return true when the socket is bound, false otherwise
*/
bool IsConnected() const { return this->sock != INVALID_SOCKET; }
virtual NetworkRecvStatus CloseConnection(bool error = true);
void CloseSocket();
virtual void SendPacket(Packet *packet);
SendPacketsState SendPackets(bool closing_down = false);
virtual Packet *ReceivePacket();
bool CanSendReceive();
/**
* Whether there is something pending in the send queue.
* @return true when something is pending in the send queue.
*/
bool HasSendQueue() { return this->packet_queue != nullptr; }
NetworkTCPSocketHandler(SOCKET s = INVALID_SOCKET);
~NetworkTCPSocketHandler();
};
/**
* "Helper" class for creating TCP connections in a non-blocking manner
*/
class TCPConnecter {
private:
/**
* The current status of the connecter.
*
* We track the status like this to ensure everything is executed from the
* game-thread, and not at another random time where we might not have the
* lock on the game-state.
*/
enum class Status {
INIT, ///< TCPConnecter is created but resolving hasn't started.
RESOLVING, ///< The hostname is being resolved (threaded).
FAILURE, ///< Resolving failed.
CONNECTING, ///< We are currently connecting.
};
std::thread resolve_thread; ///< Thread used during resolving.
std::atomic<Status> status = Status::INIT; ///< The current status of the connecter.
addrinfo *ai = nullptr; ///< getaddrinfo() allocated linked-list of resolved addresses.
std::vector<addrinfo *> addresses; ///< Addresses we can connect to.
std::map<SOCKET, NetworkAddress> sock_to_address; ///< Mapping of a socket to the real address it is connecting to. USed for DEBUG statements.
size_t current_address = 0; ///< Current index in addresses we are trying.
std::vector<SOCKET> sockets; ///< Pending connect() attempts.
std::chrono::steady_clock::time_point last_attempt; ///< Time we last tried to connect.
std::string connection_string; ///< Current address we are connecting to (before resolving).
void Resolve();
void OnResolved(addrinfo *ai);
bool TryNextAddress();
void Connect(addrinfo *address);
bool CheckActivity();
/* We do not want any other derived classes from this class being able to
* access these private members, but it is okay for TCPServerConnecter. */
friend class TCPServerConnecter;
static void ResolveThunk(TCPConnecter *connecter);
public:
TCPConnecter() {};
TCPConnecter(const std::string &connection_string, uint16 default_port);
virtual ~TCPConnecter();
/**
* Callback when the connection succeeded.
* @param s the socket that we opened
*/
virtual void OnConnect(SOCKET s) {}
/**
* Callback for when the connection attempt failed.
*/
virtual void OnFailure() {}
static void CheckCallbacks();
static void KillAll();
};
class TCPServerConnecter : public TCPConnecter {
public:
ServerAddress server_address; ///< Address we are connecting to.
TCPServerConnecter(const std::string &connection_string, uint16 default_port);
};
#endif /* NETWORK_CORE_TCP_H */
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