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Fix OpenTTD#9501: allow multiple queries to be pending at the same time
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /* | ||
| * 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/>. | ||
| */ | ||
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| /** @file network_query.cpp Query part of the network protocol. */ | ||
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| #include "../stdafx.h" | ||
| #include "core/game_info.h" | ||
| #include "network_query.h" | ||
| #include "network_gamelist.h" | ||
| #include "../error.h" | ||
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| #include "table/strings.h" | ||
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| #include "../safeguards.h" | ||
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| std::vector<std::unique_ptr<QueryNetworkGameSocketHandler>> QueryNetworkGameSocketHandler::queries = {}; | ||
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| NetworkRecvStatus QueryNetworkGameSocketHandler::CloseConnection(NetworkRecvStatus status) | ||
| { | ||
| assert(status != NETWORK_RECV_STATUS_OKAY); | ||
| assert(this->sock != INVALID_SOCKET); | ||
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| return status; | ||
| } | ||
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| /** | ||
| * Check the connection's state, i.e. is the connection still up? | ||
| */ | ||
| bool QueryNetworkGameSocketHandler::CheckConnection() | ||
| { | ||
| std::chrono::steady_clock::duration lag = std::chrono::steady_clock::now() - this->last_packet; | ||
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| /* If there was no response in 5 seconds, terminate the query. */ | ||
| if (lag > std::chrono::seconds(5)) { | ||
| this->CloseConnection(NETWORK_RECV_STATUS_CONNECTION_LOST); | ||
| return false; | ||
| } | ||
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| return true; | ||
| } | ||
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| /** | ||
| * Check whether we received/can send some data from/to the server and | ||
| * when that's the case handle it appropriately. | ||
| * @return true when everything went okay. | ||
| */ | ||
| bool QueryNetworkGameSocketHandler::Receive() | ||
| { | ||
| if (this->CanSendReceive()) { | ||
| NetworkRecvStatus res = this->ReceivePackets(); | ||
| if (res != NETWORK_RECV_STATUS_OKAY) { | ||
| this->CloseConnection(res); | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
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| /** Send the packets of this socket handler. */ | ||
| void QueryNetworkGameSocketHandler::Send() | ||
| { | ||
| this->SendPackets(); | ||
| } | ||
|
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| /** | ||
| * Query the server for server information. | ||
| */ | ||
| NetworkRecvStatus QueryNetworkGameSocketHandler::SendGameInfo() | ||
| { | ||
| this->SendPacket(new Packet(PACKET_CLIENT_GAME_INFO)); | ||
| return NETWORK_RECV_STATUS_OKAY; | ||
| } | ||
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| NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p) | ||
| { | ||
| /* We try to join a server which is full */ | ||
| ShowErrorMessage(STR_NETWORK_ERROR_SERVER_FULL, INVALID_STRING_ID, WL_CRITICAL); | ||
| return NETWORK_RECV_STATUS_SERVER_FULL; | ||
| } | ||
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| NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p) | ||
| { | ||
| /* We try to join a server where we are banned */ | ||
| ShowErrorMessage(STR_NETWORK_ERROR_SERVER_BANNED, INVALID_STRING_ID, WL_CRITICAL); | ||
| return NETWORK_RECV_STATUS_SERVER_BANNED; | ||
| } | ||
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| NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_GAME_INFO(Packet *p) | ||
| { | ||
| NetworkGameList *item = NetworkGameListAddItem(this->connection_string); | ||
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| /* Clear any existing GRFConfig chain. */ | ||
| ClearGRFConfigList(&item->info.grfconfig); | ||
| /* Retrieve the NetworkGameInfo from the packet. */ | ||
| DeserializeNetworkGameInfo(p, &item->info); | ||
| /* Check for compatability with the client. */ | ||
| CheckGameCompatibility(item->info); | ||
| /* Ensure we consider the server online. */ | ||
| item->online = true; | ||
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| UpdateNetworkGameWindow(); | ||
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| return NETWORK_RECV_STATUS_CLOSE_QUERY; | ||
| } | ||
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| NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_ERROR(Packet *p) | ||
| { | ||
| NetworkErrorCode error = (NetworkErrorCode)p->Recv_uint8(); | ||
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| /* If we query a server that is 1.11.1 or older, we get an | ||
| * NETWORK_ERROR_NOT_EXPECTED on requesting the game info. Show a special | ||
| * error popup in that case. | ||
| */ | ||
| if (error == NETWORK_ERROR_NOT_EXPECTED) { | ||
| ShowErrorMessage(STR_NETWORK_ERROR_SERVER_TOO_OLD, INVALID_STRING_ID, WL_CRITICAL); | ||
| return NETWORK_RECV_STATUS_CLOSE_QUERY; | ||
| } | ||
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| ShowErrorMessage(STR_NETWORK_ERROR_LOSTCONNECTION, INVALID_STRING_ID, WL_CRITICAL); | ||
| return NETWORK_RECV_STATUS_SERVER_ERROR; | ||
| } | ||
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| /** | ||
| * Check if any query needs to send or receive. | ||
| */ | ||
| /* static */ void QueryNetworkGameSocketHandler::SendReceive() | ||
| { | ||
| for (auto it = QueryNetworkGameSocketHandler::queries.begin(); it != QueryNetworkGameSocketHandler::queries.end(); /* nothing */) { | ||
| if (!(*it)->Receive()) { | ||
| QueryNetworkGameSocketHandler::queries.erase(it); | ||
| continue; | ||
| } | ||
| if (!(*it)->CheckConnection()) { | ||
| QueryNetworkGameSocketHandler::queries.erase(it); | ||
| continue; | ||
| } | ||
| it++; | ||
| } | ||
|
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| for (auto &query : QueryNetworkGameSocketHandler::queries) { | ||
| query->Send(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| * 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/>. | ||
| */ | ||
|
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| /** @file network_query.h Query part of the network protocol. */ | ||
|
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| #ifndef NETWORK_QUERY_H | ||
| #define NETWORK_QUERY_H | ||
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| #include "network_internal.h" | ||
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| /** Class for handling the client side of quering a game server. */ | ||
| class QueryNetworkGameSocketHandler : public ZeroedMemoryAllocator, public NetworkGameSocketHandler { | ||
| private: | ||
| static std::vector<std::unique_ptr<QueryNetworkGameSocketHandler>> queries; ///< Pending queries. | ||
| std::string connection_string; ///< Address we are connected to. | ||
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| protected: | ||
| NetworkRecvStatus Receive_SERVER_FULL(Packet *p) override; | ||
| NetworkRecvStatus Receive_SERVER_BANNED(Packet *p) override; | ||
| NetworkRecvStatus Receive_SERVER_ERROR(Packet *p) override; | ||
| NetworkRecvStatus Receive_SERVER_GAME_INFO(Packet *p) override; | ||
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| NetworkRecvStatus SendGameInfo(); | ||
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| bool CheckConnection(); | ||
| void Send(); | ||
| bool Receive(); | ||
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| public: | ||
| /** | ||
| * Create a new socket for the client side of quering game server. | ||
| * @param s The socket to connect with. | ||
| * @param connection_string The connection string of the server. | ||
| */ | ||
| QueryNetworkGameSocketHandler(SOCKET s, const std::string &connection_string) : NetworkGameSocketHandler(s), connection_string(connection_string) {} | ||
|
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| /** | ||
| * Start to query a server based on an open socket. | ||
| * @param s The socket to connect with. | ||
| * @param connection_string The connection string of the server. | ||
| */ | ||
| static void QueryServer(SOCKET s, const std::string &connection_string) | ||
| { | ||
| auto query = std::make_unique<QueryNetworkGameSocketHandler>(s, connection_string); | ||
| query->SendGameInfo(); | ||
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| QueryNetworkGameSocketHandler::queries.push_back(std::move(query)); | ||
| } | ||
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| static void SendReceive(); | ||
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| NetworkRecvStatus CloseConnection(NetworkRecvStatus status) override; | ||
| }; | ||
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| #endif /* NETWORK_QUERY_H */ |