490 lines
21 KiB
C++
490 lines
21 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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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*/
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/** @file command_func.h Functions related to commands. */
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#ifndef COMMAND_FUNC_H
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#define COMMAND_FUNC_H
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#include "command_type.h"
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#include "network/network_type.h"
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#include "company_type.h"
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#include "company_func.h"
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#include "core/backup_type.hpp"
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#include "misc/endian_buffer.hpp"
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#include "tile_map.h"
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/**
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* Define a default return value for a failed command.
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*
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* This variable contains a CommandCost object with is declared as "failed".
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* Other functions just need to return this error if there is an error,
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* which doesn't need to specific by a StringID.
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*/
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static const CommandCost CMD_ERROR = CommandCost(INVALID_STRING_ID);
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/**
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* Returns from a function with a specific StringID as error.
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*
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* This macro is used to return from a function. The parameter contains the
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* StringID which will be returned.
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*
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* @param errcode The StringID to return
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*/
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#define return_cmd_error(errcode) return CommandCost(errcode);
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void NetworkSendCommand(Commands cmd, StringID err_message, CommandCallback *callback, CompanyID company, const CommandDataBuffer &cmd_data);
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bool IsValidCommand(Commands cmd);
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CommandFlags GetCommandFlags(Commands cmd);
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const char *GetCommandName(Commands cmd);
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Money GetAvailableMoneyForCommand();
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bool IsCommandAllowedWhilePaused(Commands cmd);
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template <Commands Tcmd>
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constexpr CommandFlags GetCommandFlags()
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{
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return CommandTraits<Tcmd>::flags;
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}
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/**
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* Extracts the DC flags needed for DoCommand from the flags returned by GetCommandFlags
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* @param cmd_flags Flags from GetCommandFlags
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* @return flags for DoCommand
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*/
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static constexpr inline DoCommandFlag CommandFlagsToDCFlags(CommandFlags cmd_flags)
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{
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DoCommandFlag flags = DC_NONE;
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if (cmd_flags & CMD_NO_WATER) flags |= DC_NO_WATER;
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if (cmd_flags & CMD_AUTO) flags |= DC_AUTO;
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if (cmd_flags & CMD_ALL_TILES) flags |= DC_ALL_TILES;
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return flags;
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}
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/** Helper class to keep track of command nesting level. */
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struct RecursiveCommandCounter {
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RecursiveCommandCounter() noexcept { _counter++; }
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~RecursiveCommandCounter() noexcept { _counter--; }
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/** Are we in the top-level command execution? */
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bool IsTopLevel() const { return _counter == 1; }
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private:
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static int _counter;
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};
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#if defined(__GNUC__) && !defined(__clang__)
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/*
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* We cast specialized function pointers to a generic one, but don't use the
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* converted value to call the function, which is safe, except that GCC
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* helpfully thinks it is not.
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*
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* "Any pointer to function can be converted to a pointer to a different function type.
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* Calling the function through a pointer to a different function type is undefined,
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* but converting such pointer back to pointer to the original function type yields
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* the pointer to the original function." */
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wcast-function-type"
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# define SILENCE_GCC_FUNCTION_POINTER_CAST
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#endif
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template<Commands TCmd, typename T, bool THasTile> struct CommandHelper;
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class CommandHelperBase {
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protected:
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static void InternalDoBefore(bool top_level, bool test);
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static void InternalDoAfter(CommandCost &res, DoCommandFlag flags, bool top_level, bool test);
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static std::tuple<bool, bool, bool> InternalPostBefore(Commands cmd, CommandFlags flags, TileIndex tile, StringID err_message, bool network_command);
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static void InternalPostResult(const CommandCost &res, TileIndex tile, bool estimate_only, bool only_sending, StringID err_message, bool my_cmd);
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static bool InternalExecutePrepTest(CommandFlags cmd_flags, TileIndex tile, Backup<CompanyID> &cur_company);
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static std::tuple<bool, bool, bool> InternalExecuteValidateTestAndPrepExec(CommandCost &res, CommandFlags cmd_flags, bool estimate_only, bool network_command, Backup<CompanyID> &cur_company);
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static CommandCost InternalExecuteProcessResult(Commands cmd, CommandFlags cmd_flags, const CommandCost &res_test, const CommandCost &res_exec, Money extra_cash, TileIndex tile, Backup<CompanyID> &cur_company);
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static void LogCommandExecution(Commands cmd, StringID err_message, TileIndex tile, const CommandDataBuffer &args, bool failed);
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};
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/**
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* Templated wrapper that exposes the command parameter arguments
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* for the various Command::Do/Post calls.
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* @tparam Tcmd The command-id to execute.
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* @tparam Tret Return type of the command.
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* @tparam Targs The command parameter types.
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*/
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template <Commands Tcmd, typename Tret, typename... Targs>
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struct CommandHelper<Tcmd, Tret(*)(DoCommandFlag, Targs...), true> : protected CommandHelperBase {
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private:
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/** Extract the \c CommandCost from a command proc result. */
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static inline CommandCost &ExtractCommandCost(Tret &ret)
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{
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if constexpr (std::is_same_v<Tret, CommandCost>) {
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return ret;
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} else {
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return std::get<0>(ret);
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}
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}
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/** Make a command proc result from a \c CommandCost. */
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static inline Tret MakeResult(const CommandCost &cost)
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{
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Tret ret{};
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ExtractCommandCost(ret) = cost;
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return ret;
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}
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public:
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/**
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* This function executes a given command with the parameters from the #CommandProc parameter list.
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* Depending on the flags parameter it executes or tests a command.
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*
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* @note This function is to be called from the StateGameLoop or from within the execution of a Command.
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* This function must not be called from the context of a "player" (real person, AI, game script).
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* Use ::Post for commands directly triggered by "players".
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*
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* @param flags Flags for the command and how to execute the command
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* @param args Parameters for the command
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* @see CommandProc
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* @return the cost
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*/
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static Tret Do(DoCommandFlag flags, Targs... args)
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{
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if constexpr (std::is_same_v<TileIndex, std::tuple_element_t<0, std::tuple<Targs...>>>) {
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/* Do not even think about executing out-of-bounds tile-commands. */
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TileIndex tile = std::get<0>(std::make_tuple(args...));
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if (tile != 0 && (tile >= Map::Size() || (!IsValidTile(tile) && (flags & DC_ALL_TILES) == 0))) return MakeResult(CMD_ERROR);
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}
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RecursiveCommandCounter counter{};
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/* Only execute the test call if it's toplevel, or we're not execing. */
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if (counter.IsTopLevel() || !(flags & DC_EXEC)) {
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InternalDoBefore(counter.IsTopLevel(), true);
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Tret res = CommandTraits<Tcmd>::proc(flags & ~DC_EXEC, args...);
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InternalDoAfter(ExtractCommandCost(res), flags, counter.IsTopLevel(), true); // Can modify res.
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if (ExtractCommandCost(res).Failed() || !(flags & DC_EXEC)) return res;
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}
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/* Execute the command here. All cost-relevant functions set the expenses type
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* themselves to the cost object at some point. */
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InternalDoBefore(counter.IsTopLevel(), false);
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Tret res = CommandTraits<Tcmd>::proc(flags, args...);
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InternalDoAfter(ExtractCommandCost(res), flags, counter.IsTopLevel(), false);
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return res;
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}
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/**
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* Shortcut for the long Post when not using a callback.
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* @param err_message Message prefix to show on error
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* @param args Parameters for the command
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*/
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static inline bool Post(StringID err_message, Targs... args) { return Post<CommandCallback>(err_message, nullptr, std::forward<Targs>(args)...); }
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/**
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* Shortcut for the long Post when not using an error message.
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* @param callback A callback function to call after the command is finished
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* @param args Parameters for the command
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*/
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template <typename Tcallback>
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static inline bool Post(Tcallback *callback, Targs... args) { return Post((StringID)0, callback, std::forward<Targs>(args)...); }
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/**
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* Shortcut for the long Post when not using a callback or an error message.
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* @param args Parameters for the command
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*/
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static inline bool Post(Targs... args) { return Post<CommandCallback>((StringID)0, nullptr, std::forward<Targs>(args)...); }
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/**
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* Top-level network safe command execution for the current company.
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* Must not be called recursively. The callback is called when the
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* command succeeded or failed.
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*
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* @param err_message Message prefix to show on error
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* @param callback A callback function to call after the command is finished
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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template <typename Tcallback>
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static bool Post(StringID err_message, Tcallback *callback, Targs... args)
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{
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return InternalPost(err_message, callback, true, false, std::forward_as_tuple(args...));
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}
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/**
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* Execute a command coming from the network.
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* @param err_message Message prefix to show on error
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* @param callback A callback function to call after the command is finished
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* @param my_cmd indicator if the command is from a company or server (to display error messages for a user)
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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template <typename Tcallback>
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static bool PostFromNet(StringID err_message, Tcallback *callback, bool my_cmd, std::tuple<Targs...> args)
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{
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return InternalPost(err_message, callback, my_cmd, true, std::move(args));
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}
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/**
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* Prepare a command to be send over the network
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* @param cmd The command to execute (a CMD_* value)
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* @param err_message Message prefix to show on error
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* @param company The company that wants to send the command
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* @param args Parameters for the command
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*/
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static void SendNet(StringID err_message, CompanyID company, Targs... args)
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{
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auto args_tuple = std::forward_as_tuple(args...);
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::NetworkSendCommand(Tcmd, err_message, nullptr, company, EndianBufferWriter<CommandDataBuffer>::FromValue(args_tuple));
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}
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/**
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* Top-level network safe command execution without safety checks.
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* @param err_message Message prefix to show on error
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* @param callback A callback function to call after the command is finished
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* @param my_cmd indicator if the command is from a company or server (to display error messages for a user)
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* @param estimate_only whether to give only the estimate or also execute the command
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* @param location Tile location for user feedback.
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* @param args Parameters for the command
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* @return the command cost of this function.
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*/
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template <typename Tcallback>
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static Tret Unsafe(StringID err_message, Tcallback *callback, bool my_cmd, bool estimate_only, TileIndex location, std::tuple<Targs...> args)
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{
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return Execute(err_message, reinterpret_cast<CommandCallback *>(callback), my_cmd, estimate_only, false, location, std::move(args));
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}
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protected:
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/** Helper to process a single ClientID argument. */
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template <class T>
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static inline void SetClientIdHelper(T &data)
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{
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if constexpr (std::is_same_v<ClientID, T>) {
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if (data == INVALID_CLIENT_ID) data = CLIENT_ID_SERVER;
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}
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}
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/** Set all invalid ClientID's to the proper value. */
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template<class Ttuple, size_t... Tindices>
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static inline void SetClientIds(Ttuple &values, std::index_sequence<Tindices...>)
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{
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((SetClientIdHelper(std::get<Tindices>(values))), ...);
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}
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/** Remove the first element of a tuple. */
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template <template <typename...> typename Tt, typename T1, typename... Ts>
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static inline Tt<Ts...> RemoveFirstTupleElement(const Tt<T1, Ts...> &tuple)
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{
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return std::apply([](auto &&, const auto&... args) { return std::tie(args...); }, tuple);
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}
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template <typename Tcallback>
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static bool InternalPost(StringID err_message, Tcallback *callback, bool my_cmd, bool network_command, std::tuple<Targs...> args)
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{
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/* Where to show the message? */
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TileIndex tile{};
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if constexpr (std::is_same_v<TileIndex, std::tuple_element_t<0, decltype(args)>>) {
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tile = std::get<0>(args);
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}
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return InternalPost(err_message, callback, my_cmd, network_command, tile, std::move(args));
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}
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template <typename Tcallback>
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static bool InternalPost(StringID err_message, Tcallback *callback, bool my_cmd, bool network_command, TileIndex tile, std::tuple<Targs...> args)
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{
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/* Do not even think about executing out-of-bounds tile-commands. */
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if (tile != 0 && (tile >= Map::Size() || (!IsValidTile(tile) && (GetCommandFlags<Tcmd>() & CMD_ALL_TILES) == 0))) return false;
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auto [err, estimate_only, only_sending] = InternalPostBefore(Tcmd, GetCommandFlags<Tcmd>(), tile, err_message, network_command);
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if (err) return false;
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/* Only set client IDs when the command does not come from the network. */
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if (!network_command && GetCommandFlags<Tcmd>() & CMD_CLIENT_ID) SetClientIds(args, std::index_sequence_for<Targs...>{});
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Tret res = Execute(err_message, reinterpret_cast<CommandCallback *>(callback), my_cmd, estimate_only, network_command, tile, args);
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InternalPostResult(ExtractCommandCost(res), tile, estimate_only, only_sending, err_message, my_cmd);
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if (!estimate_only && !only_sending && callback != nullptr) {
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if constexpr (std::is_same_v<Tcallback, CommandCallback>) {
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/* Callback that doesn't need any command arguments. */
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callback(Tcmd, ExtractCommandCost(res), tile);
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} else if constexpr (std::is_same_v<Tcallback, CommandCallbackData>) {
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/* Generic callback that takes packed arguments as a buffer. */
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if constexpr (std::is_same_v<Tret, CommandCost>) {
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callback(Tcmd, ExtractCommandCost(res), EndianBufferWriter<CommandDataBuffer>::FromValue(args), {});
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} else {
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callback(Tcmd, ExtractCommandCost(res), EndianBufferWriter<CommandDataBuffer>::FromValue(args), EndianBufferWriter<CommandDataBuffer>::FromValue(RemoveFirstTupleElement(res)));
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}
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} else if constexpr (!std::is_same_v<Tret, CommandCost> && std::is_same_v<Tcallback *, typename CommandTraits<Tcmd>::RetCallbackProc>) {
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std::apply(callback, std::tuple_cat(std::make_tuple(Tcmd), res));
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} else {
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/* Callback with arguments. We assume that the tile is only interesting if it actually is in the command arguments. */
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if constexpr (std::is_same_v<Tret, CommandCost>) {
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std::apply(callback, std::tuple_cat(std::make_tuple(Tcmd, res), args));
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} else {
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std::apply(callback, std::tuple_cat(std::make_tuple(Tcmd), res, args));
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}
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}
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}
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return ExtractCommandCost(res).Succeeded();
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}
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/** Helper to process a single ClientID argument. */
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template <class T>
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static inline bool ClientIdIsSet(T &data)
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{
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if constexpr (std::is_same_v<ClientID, T>) {
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return data != INVALID_CLIENT_ID;
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} else {
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return true;
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}
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}
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/** Check if all ClientID arguments are set to valid values. */
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template<class Ttuple, size_t... Tindices>
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static inline bool AllClientIdsSet(Ttuple &values, std::index_sequence<Tindices...>)
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{
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return (ClientIdIsSet(std::get<Tindices>(values)) && ...);
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}
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template<class Ttuple>
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static inline Money ExtractAdditionalMoney(Ttuple &values)
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{
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if constexpr (std::is_same_v<std::tuple_element_t<1, Tret>, Money>) {
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return std::get<1>(values);
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} else {
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return {};
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}
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}
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static Tret Execute(StringID err_message, CommandCallback *callback, bool my_cmd, bool estimate_only, bool network_command, TileIndex tile, std::tuple<Targs...> args)
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{
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/* Prevent recursion; it gives a mess over the network */
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RecursiveCommandCounter counter{};
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assert(counter.IsTopLevel());
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/* Command flags are used internally */
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constexpr CommandFlags cmd_flags = GetCommandFlags<Tcmd>();
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if constexpr ((cmd_flags & CMD_CLIENT_ID) != 0) {
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/* Make sure arguments are properly set to a ClientID also when processing external commands. */
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assert(AllClientIdsSet(args, std::index_sequence_for<Targs...>{}));
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}
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Backup<CompanyID> cur_company(_current_company, FILE_LINE);
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if (!InternalExecutePrepTest(cmd_flags, tile, cur_company)) {
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cur_company.Trash();
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return MakeResult(CMD_ERROR);
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}
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/* Test the command. */
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DoCommandFlag flags = CommandFlagsToDCFlags(cmd_flags);
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Tret res = std::apply(CommandTraits<Tcmd>::proc, std::tuple_cat(std::make_tuple(flags), args));
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auto [exit_test, desync_log, send_net] = InternalExecuteValidateTestAndPrepExec(ExtractCommandCost(res), cmd_flags, estimate_only, network_command, cur_company);
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if (exit_test) {
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if (desync_log) LogCommandExecution(Tcmd, err_message, tile, EndianBufferWriter<CommandDataBuffer>::FromValue(args), true);
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cur_company.Restore();
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return res;
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}
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/* If we are in network, and the command is not from the network
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* send it to the command-queue and abort execution. */
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if (send_net) {
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::NetworkSendCommand(Tcmd, err_message, callback, _current_company, EndianBufferWriter<CommandDataBuffer>::FromValue(args));
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cur_company.Restore();
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/* Don't return anything special here; no error, no costs.
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* This way it's not handled by DoCommand and only the
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* actual execution of the command causes messages. Also
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* reset the storages as we've not executed the command. */
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return {};
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}
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if (desync_log) LogCommandExecution(Tcmd, err_message, tile, EndianBufferWriter<CommandDataBuffer>::FromValue(args), false);
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/* Actually try and execute the command. */
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Tret res2 = std::apply(CommandTraits<Tcmd>::proc, std::tuple_cat(std::make_tuple(flags | DC_EXEC), args));
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/* Convention: If the second result element is of type Money,
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* this is the additional cash required for the command. */
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Money additional_money{};
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if constexpr (!std::is_same_v<Tret, CommandCost>) { // No short-circuiting for 'if constexpr'.
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additional_money = ExtractAdditionalMoney(res2);
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}
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if constexpr (std::is_same_v<Tret, CommandCost>) {
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return InternalExecuteProcessResult(Tcmd, cmd_flags, res, res2, additional_money, tile, cur_company);
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} else {
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std::get<0>(res2) = InternalExecuteProcessResult(Tcmd, cmd_flags, ExtractCommandCost(res), ExtractCommandCost(res2), additional_money, tile, cur_company);
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return res2;
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}
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}
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};
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/**
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* Overload for #CommandHelper that exposes additional \c Post variants
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* for commands that don't take a TileIndex themselves.
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* @tparam Tcmd The command-id to execute.
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* @tparam Tret Return type of the command.
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* @tparam Targs The command parameter types.
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*/
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template <Commands Tcmd, typename Tret, typename... Targs>
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struct CommandHelper<Tcmd, Tret(*)(DoCommandFlag, Targs...), false> : CommandHelper<Tcmd, Tret(*)(DoCommandFlag, Targs...), true>
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{
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/* Do not allow Post without explicit location. */
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static inline bool Post(StringID err_message, Targs... args) = delete;
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template <typename Tcallback>
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static inline bool Post(Tcallback *callback, Targs... args) = delete;
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static inline bool Post(Targs... args) = delete;
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template <typename Tcallback>
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static bool Post(StringID err_message, Tcallback *callback, Targs... args) = delete;
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/**
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* Shortcut for Post when not using a callback.
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* @param err_message Message prefix to show on error
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* @param location Tile location for user feedback.
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* @param args Parameters for the command
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*/
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static inline bool Post(StringID err_message, TileIndex location, Targs... args) { return Post<CommandCallback>(err_message, nullptr, location, std::forward<Targs>(args)...); }
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/**
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* Shortcut for Post when not using an error message.
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* @param callback A callback function to call after the command is finished
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* @param location Tile location for user feedback.
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* @param args Parameters for the command
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*/
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template <typename Tcallback>
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static inline bool Post(Tcallback *callback, TileIndex location, Targs... args) { return Post((StringID)0, callback, location, std::forward<Targs>(args)...); }
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/**
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* Shortcut for Post when not using a callback or an error message.
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* @param location Tile location for user feedback.
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* @param args Parameters for the command*
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*/
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static inline bool Post(TileIndex location, Targs... args) { return Post<CommandCallback>((StringID)0, nullptr, location, std::forward<Targs>(args)...); }
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/**
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* Post variant that takes a TileIndex (for error window location and text effects) for
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* commands that don't take a TileIndex by themselves.
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* @param err_message Message prefix to show on error
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* @param callback A callback function to call after the command is finished
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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template <typename Tcallback>
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static inline bool Post(StringID err_message, Tcallback *callback, TileIndex location, Targs... args)
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{
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return CommandHelper<Tcmd, Tret(*)(DoCommandFlag, Targs...), true>::InternalPost(err_message, callback, true, false, location, std::forward_as_tuple(args...));
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}
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};
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#ifdef SILENCE_GCC_FUNCTION_POINTER_CAST
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# pragma GCC diagnostic pop
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#endif
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template <Commands Tcmd>
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using Command = CommandHelper<Tcmd, typename CommandTraits<Tcmd>::ProcType, (GetCommandFlags<Tcmd>() & CMD_LOCATION) == 0>;
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#endif /* COMMAND_FUNC_H */
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