191 lines
5.9 KiB
Rust
191 lines
5.9 KiB
Rust
#![allow(dead_code)]
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/// Manage UCI messages and link into chess component
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mod uci_command;
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use log::{info, warn};
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use std::io::*;
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use crate::uci_command::*;
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use chess::{Game, Board, ChessMove};
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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: BufRead, Fo: Write> {
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source: Fi,
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destination: 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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}
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impl<Fi: BufRead, 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: Fi, destination: Fo) -> UciEngine<Fi, Fo> {
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UciEngine::<Fi, Fo>{
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source, destination,
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id: Id::new(),
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uciok: false,
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initial: Board::default(),
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game: Game::new()
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}
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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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while !self.uciok {
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self.pull();
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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) {
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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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}
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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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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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/// 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){
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match parse (&mut command.to_string()) {
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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(_) => {unimplemented!("command not implemented")},
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Err(_) => warn!("Not a command"),
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}
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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) {
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let mut command = String::new();
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match self.source.read_line(&mut command) {
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Ok(0) => self.terminate("Chess engine closed connection."),
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Ok(_) => {
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info!("← {}", command);
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self.exec(&command)
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},
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Err(reason) => warn!("Unable to read from engine: {reason}"),
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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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let mut data = String::new();
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match self.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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}
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/// Push a Uci Gui command to the engine
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fn push(&mut self, command: GuiCommand) {
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let command_str = command.to_string();
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match self.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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}
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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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match self.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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}
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}
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// LocalWords: uci
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