325 lines
11 KiB
Rust
325 lines
11 KiB
Rust
#![allow(dead_code)]
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/// Manage UCI messages and link into chess component
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pub mod uci_command;
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use log::{info, warn};
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use std::io::*;
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use std::time::Duration;
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use std::result::Result;
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use crate::uci_command::*;
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use chess::{Game, Board, ChessMove};
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const DEFAULT_TIME: (Option<Duration>, Option<Duration>) = (Some(Duration::from_secs(120 * 60)), None);
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/// Structure used to manage a chess game with a uci engine.
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///
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/// It needs a in / out communication channel to read / push line by line uci commands
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///c
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/// ```rust
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/// use chess_uci::UciEngine;
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/// use std::process::{Command, Stdio};
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/// use std::io::BufReader;
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///
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/// let process = match Command::new("stockfish")
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/// .stdin(Stdio::piped())
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/// .stdout(Stdio::piped())
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/// .spawn() {
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/// Err(why) => panic!("couldn't spawn stockfish: {}", why),
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/// Ok(process) => process,
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/// };
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/// let (sf_in,sf_out) = (process.stdin.expect("Program stdin"), process.stdout.expect("Program stdout"));
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///
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/// let mut uci = UciEngine::new(BufReader::new(sf_out), sf_in);
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/// // .. uci.init(); ..
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/// uci.push_raw("quit\n");
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/// ```
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pub struct UciEngine<Fi: Read, Fo: Write> {
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source: Option<BufReader<Fi>>,
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destination: Option<Fo>,
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uciok: bool,
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id: Id,
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initial: Board,
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game: Game,
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/// white (total, incr), black (total, incr)
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time: [(Option<Duration>, Option<Duration>); 2],
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/// white, black
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player: [Player; 2],
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}
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pub enum UciOption {
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Ponder{value: bool},
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UCIElo{value: Option<u32>},
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}
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#[derive(Clone, Copy)]
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pub enum Player{Human{elo: Option<u32>}, Machine{elo: Option<u32>}}
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pub enum GameOption {
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WhiteTotalTime{value: Option<Duration>},
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BlackTotalTime{value: Option<Duration>},
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WhiteIncrement{value: Option<Duration>},
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BlackIncrement{value: Option<Duration>},
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WhitePlayer{value: Player},
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BlackPlayer{value: Player},
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}
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impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
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/// Create new game manager
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///
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/// Requires line by line input and output streams to communicate with uci engine
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pub fn new(source: Option<Fi>, destination: Option<Fo>) -> UciEngine<Fi, Fo> {
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UciEngine::<Fi, Fo>{
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source: source.map(|x| BufReader::new(x)),
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destination,
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id: Id::default(),
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uciok: false,
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initial: Board::default(),
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game: Game::new(),
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time: [DEFAULT_TIME; 2],
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player: [Player::Human{elo: None}; 2],
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}
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}
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pub fn game_option(&mut self, option: GameOption) -> GameOption {
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let old_value: GameOption;
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match option {
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GameOption::WhiteTotalTime{value} => {old_value = GameOption::WhiteTotalTime { value: self.time[Color::White.to_index()].0 };
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self.time[Color::White.to_index()].0 = value},
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GameOption::BlackTotalTime{value} => {old_value = GameOption::BlackTotalTime { value: self.time[Color::Black.to_index()].0 };
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self.time[Color::Black.to_index()].0 = value},
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GameOption::WhiteIncrement{value} => {old_value = GameOption::WhiteIncrement { value: self.time[Color::White.to_index()].1 };
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self.time[Color::White.to_index()].1 = value},
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GameOption::BlackIncrement{value} => {old_value = GameOption::BlackIncrement { value: self.time[Color::Black.to_index()].1 };
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self.time[Color::Black.to_index()].1 = value},
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GameOption::WhitePlayer{value} => {old_value = GameOption::WhitePlayer { value: self.player[Color::White.to_index()] };
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self.player[Color::White.to_index()] = value},
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GameOption::BlackPlayer{value} => {old_value = GameOption::WhitePlayer { value: self.player[Color::Black.to_index()] };
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self.player[Color::Black.to_index()] = value},
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}
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old_value
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}
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/// Launch uci engine initialisation
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///
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/// Retrieve data from uci engine (until uciok command from engine)
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pub fn init(&mut self){
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self.push(GuiCommand::Uci);
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// Consume commands until uciok messages
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if self.source.is_some() {
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while !self.uciok {
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self.pull();
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}
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}
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}
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/// Initialize a new game
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///
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/// Set a new board internally and tell the engine
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pub fn new_game(&mut self) {
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self.initial = Board::default();
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self.game = Game::new_with_board(self.initial);
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self.push(GuiCommand::UciNewGame);
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}
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/// Play a move
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///
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/// Update internal game reference and tell the uci engine
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///
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/// ```rust
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/// use chess::ChessMove;
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/// use std::str::FromStr;
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/// use chess_uci::*;
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/// use std::io;
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///
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/// let mut uci = UciEngine::new(io::empty(), io::sink());
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///
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/// uci.make_move(ChessMove::from_str("e2e4").expect("error converting e2e4"));
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/// ```
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pub fn make_move(&mut self, chess_move: ChessMove) -> bool {
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if self.game.make_move(chess_move) {
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self.push(GuiCommand::Position { position: Some(self.initial), moves: self.game.actions().to_vec() });
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true
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} else {
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false
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}
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}
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fn terminate(&mut self, reason: &str) {
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self.uciok = false;
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info!("UCI termination: {}", reason);
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}
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/// Provides the name of the uci engine
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pub fn name(&self) -> Option<String> {
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self.id.name()
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}
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/// Provides the author sof the uci engine
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pub fn author(&self) -> Option<String> {
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self.id.author()
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}
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fn update(&mut self, id: &Id){
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if self.is_uciok() {warn!("Engine info should not be updated now (uciok)");}
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self.id.update(id);
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}
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fn update_from_str(&mut self, name: Option<&str>, author: Option<&str>){
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if self.is_uciok() {warn!("Engine info should not be updated now (uciok)");}
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self.id.update_from_str(name, author);
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}
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/// Execute a uci command
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///
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/// if `EngineCommand::Id`: update name or authorship of the engine
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/// if `EngineCommand::UciOk`: end engine initialization phase
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pub fn exec(&mut self, command: &str) -> Result<EngineCommand, &'static str> {
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let uci_command = parse (&mut command.to_string());
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match uci_command.clone() {
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Ok(EngineCommand::Id{id}) => self.update(&id),
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Ok(EngineCommand::UciOk) => self.uciok(),
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Ok(EngineCommand::Opt { options: _ }) => {},
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Ok(EngineCommand::Info { infos: _ }) |
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Ok(EngineCommand::BestMove { best_move: _, ponder: _ }) |
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Ok(EngineCommand::ReadyOk)
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=> {},
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Ok(EngineCommand::Registration)|
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Ok(EngineCommand::CopyProtection)=> {unimplemented!("command not implemented")},
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Err(_) => warn!("Not a command"),
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};
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uci_command
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}
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/// Retrieve a line from the uci engine input stream and parse it
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pub fn pull(&mut self) -> Option<EngineCommand> {
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if let Some(source) = &mut self.source {
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let mut command = String::new();
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match source.read_line(&mut command) {
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Ok(0) => {self.terminate("Chess engine closed connection."); None},
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Ok(_) => {
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info!("← {}", command);
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self.exec(&command).ok()
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},
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Err(reason) => {warn!("Unable to read from engine: {reason}"); None},
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}
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} else {
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info!("❌ No connected uci engine");
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None
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}
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}
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/// Read a line from the uci engine input stream (do not parse)
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pub fn pull_raw(&mut self) -> Option<String> {
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if let Some(source) = &mut self.source {
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let mut data = String::new();
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match source.read_line(&mut data) {
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Ok(0) => {self.terminate("Chess engine closed connection."); None},
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Ok(_) => {info!("↜ {}", data); Some(data.clone())},
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Err(reason) => {warn!("Unable to read from engine: {reason}"); None},
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}
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} else {
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info!("❌ No connected uci engine");
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None
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}
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}
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/// Push a Uci Gui command to the engine
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pub fn push(&mut self, command: GuiCommand) {
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if let Some(destination) = &mut self.destination {
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let command_str = command.to_string();
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match destination.write(command_str.as_bytes()){
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Ok(n) if n == command_str.len() => info!("→ gui: {command_str}"),
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Ok(n) => warn!("⚠ gui: {command_str} truncated at {n}"),
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Err(reason) => warn!("Unable to send command {command_str}: {reason}"),
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}
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} else {
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info!("❌ No connected uci engine");
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}
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}
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/// Push string (not a game manager integrated command) to the Uci engine output stream
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pub fn push_raw(&mut self, data: &str){
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if let Some(destination) = &mut self.destination {
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match destination.write(data.as_bytes()) {
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Ok(n) if n == data.len() => info!("↝ raw: {data}"),
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Ok(n) => warn!("⚠ raw: {data} truncated at {n}"),
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Err(reason) => warn!("Unable to send raw {data}: {reason}"),
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}
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} else {
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info!("❌ No connected uci engine");
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}
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}
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}
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impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
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fn uciok(&mut self){
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self.uciok = true;
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}
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/// Tell whether the uci engine has initialized
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pub fn is_uciok(&self) -> bool {
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self.uciok
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}
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pub fn human_play(&mut self, chess_move: ChessMove) -> Result<ChessMove, &'static str> {
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match self.player[self.side_to_move().to_index()] {
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Player::Human{..} => {
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if self.make_move(chess_move) {
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Ok(chess_move)
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} else {
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Err("Invalid move for human player")
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}
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},
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Player::Machine {..} => Err("Not a human to play for current color.")
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}
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}
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pub fn go(&mut self) -> Result<(), &'static str> {
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match self.player[self.side_to_move().to_index()] {
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Player::Human{..} => Err("Not a machine to play for current color."),
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Player::Machine {elo} =>
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{
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if self.is_uciok() {
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if let Some(elo) = elo {
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self.push(GuiCommand::SetOption {option: Opt::UCILimitStrength{value: true}});
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self.push(GuiCommand::SetOption {option: Opt::UCIElo{value: elo}});
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}
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let (wtime, wincr) = self.time[Color::White.to_index()];
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let (btime, bincr) = self.time[Color::Black.to_index()];
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self.push(GuiCommand::Go{wtime, wincr, btime, bincr});
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Ok(())
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} else {
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Err("UCI engine not ready")
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}
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}
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}
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}
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}
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use chess::{Square, Piece, Color};
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impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
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pub fn piece_on(&self, square: Square) -> Option<Piece> {
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self.game.current_position().piece_on(square)
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}
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pub fn color_on(&self, square: Square) -> Option<Color> {
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self.game.current_position().color_on(square)
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}
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pub fn current_position(&self) -> Board {
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self.game.current_position()
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}
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pub fn side_to_move(&self) -> Color {
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self.game.side_to_move()
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}
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}
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// LocalWords: uci
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