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use serde::Deserialize;
use serde_json::Result;
use std::env;
use std::io::{BufRead, BufReader, Write};
use std::process::{ChildStdin, ChildStdout, Command, Stdio};
use std::string::String;
pub struct ChessEngine {
stdin: ChildStdin,
reader: BufReader<ChildStdout>,
}
#[derive(Deserialize)]
struct PerftResult {
ms: i32,
result: u64,
}
#[derive(Debug)]
pub struct PerftTest {
pub position: &'static str,
pub depth: i32,
pub expected: u64,
}
pub const PERFT_TESTS: &[PerftTest; 17] = &[
PerftTest {
position: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
depth: 1,
expected: 20,
},
PerftTest {
position: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
depth: 2,
expected: 400,
},
PerftTest {
position: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
depth: 3,
expected: 8902,
},
PerftTest {
position: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
depth: 4,
expected: 197281,
},
PerftTest {
position: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
depth: 5,
expected: 4865609,
},
// kiwipete
PerftTest {
position: "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1",
depth: 1,
expected: 48,
},
PerftTest {
position: "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1",
depth: 2,
expected: 2039,
},
PerftTest {
position: "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1",
depth: 3,
expected: 97862,
},
PerftTest {
position: "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1",
depth: 4,
expected: 4085603,
},
// other ones
PerftTest {
position: "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1",
depth: 1,
expected: 14,
},
PerftTest {
position: "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1",
depth: 2,
expected: 191,
},
PerftTest {
position: "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1",
depth: 3,
expected: 2812,
},
PerftTest {
position: "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1",
depth: 4,
expected: 43238,
},
// other position
PerftTest {
position: "r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1",
depth: 1,
expected: 6,
},
PerftTest {
position: "r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1",
depth: 2,
expected: 264,
},
PerftTest {
position: "r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1",
depth: 3,
expected: 9467,
},
PerftTest {
position: "r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1",
depth: 4,
expected: 422333,
},
];
impl ChessEngine {
/// Spawns the engine process and initializes UCI mode
pub fn new(path_to_engine: &str) -> Self {
let mut child = Command::new(path_to_engine)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.expect("Failed to start chess engine");
let stdin = child.stdin.take().expect("Failed to open stdin");
let stdout = child.stdout.take().expect("Failed to open stdout");
let reader = BufReader::new(stdout);
let mut engine = Self { stdin, reader };
// Boot up UCI mode
engine.send_command("uci");
engine.wait_for_response("uciok");
engine
}
/// Sends a clean string command to the engine.
/// Explicitly appends a newline and flushes the stream.
pub fn send_command(&mut self, cmd: &str) {
let formatted = format!("{}\n", cmd);
self.stdin
.write_all(formatted.as_bytes())
.expect("Failed to write to engine");
self.stdin.flush().expect("Failed to flush stdin");
}
/// Blocks and reads lines until a specific keyword signature is found
pub fn wait_for_response(&mut self, expected_keyword: &str) -> Vec<String> {
let mut lines = Vec::new();
let mut line = String::new();
while self.reader.read_line(&mut line).is_ok() {
let clean_line = line.trim().to_string();
if clean_line.starts_with("info") {
println!("{}", clean_line)
}
lines.push(clean_line.clone());
// Clear buffer for the next read loop
line.clear();
if clean_line.contains(expected_keyword) {
break;
}
}
lines
}
pub fn read_line(&mut self) -> String {
let mut line = String::new();
let _ = self.reader.read_line(&mut line);
let clean_line = line.trim().to_string();
if clean_line.starts_with("info") {
println!("{}", clean_line)
}
clean_line
}
}
fn test_perft(test: &PerftTest, engine: &mut ChessEngine) {
let cmd = "position fen ".to_string() + &test.position;
engine.send_command(&cmd);
let cmd = "perft ".to_string() + &test.depth.to_string();
engine.send_command(&cmd);
let line = engine.read_line();
let result = parse_perft_result(&line);
match result {
Err(err) => {
println!("error: {}", err);
}
Ok(perft) => {
if perft.result == test.expected {
println!(
"passed (Depth {}): {} nodes in {}ms",
test.depth, perft.result, perft.ms
);
} else {
println!(
"FAILED Depth: {}, Expected: {}, got: {}, position: {}",
test.depth, test.expected, perft.result, test.position,
);
std::process::exit(1);
}
}
}
}
fn parse_perft_result(raw: &str) -> Result<PerftResult> {
serde_json::from_str(raw)
}
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() != 2 {
println!("usage: ./cli <path to test executable>");
return;
}
let engine_path = &args[1];
let mut engine = ChessEngine::new(engine_path);
println!("Engine running");
engine.send_command("isready");
engine.wait_for_response("readyok");
for test in PERFT_TESTS.iter() {
test_perft(test, &mut engine);
}
}
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