commit bc72d3455d201f2be397cf4c30bc914b3e52543a
Author: Aode (lion) <asonix@asonix.dog>
Date:   Thu Dec 30 21:15:37 2021 -0600

    Wrapping structure for a chess engine

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..1826307
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "chess"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web = { version = "4.0.0-beta.18", default-features = false }
+serde = { version = "1", features = ["derive"] }
+serde_repr = "0.1"
+tokio = { version = "1", default-features = false, features = ["sync"] }
+tracing = "0.1"
+tracing-actix-web = "0.5.0-beta.7"
+tracing-log = "0.1"
+tracing-subscriber = "0.3"
+uuid = { version = "0.8.2", features = ["serde", "v4"] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4b27645
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,325 @@
+use actix_web::web::{Data, Json};
+use actix_web::{App, HttpResponse, HttpServer, Responder};
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+use tokio::sync::mpsc::Sender;
+use tracing::subscriber::set_global_default;
+use tracing_actix_web::TracingLogger;
+use tracing_log::LogTracer;
+use tracing_subscriber::filter::Targets;
+use tracing_subscriber::fmt::format::FmtSpan;
+use tracing_subscriber::prelude::__tracing_subscriber_SubscriberExt;
+use tracing_subscriber::Registry;
+use uuid::Uuid;
+
+const INITIAL_PIECES: [(File, Rank, PieceKind, Color); 32] = [
+    (File::A, Rank::One, PieceKind::Rook, Color::White),
+    (File::B, Rank::One, PieceKind::Knight, Color::White),
+    (File::C, Rank::One, PieceKind::Bishop, Color::White),
+    (File::D, Rank::One, PieceKind::Queen, Color::White),
+    (File::E, Rank::One, PieceKind::King, Color::White),
+    (File::F, Rank::One, PieceKind::Bishop, Color::White),
+    (File::G, Rank::One, PieceKind::Knight, Color::White),
+    (File::H, Rank::One, PieceKind::Rook, Color::White),
+    (File::A, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::B, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::C, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::D, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::E, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::F, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::G, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::H, Rank::Two, PieceKind::Pawn, Color::White),
+    (File::A, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::B, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::C, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::D, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::E, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::F, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::G, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::H, Rank::Seven, PieceKind::Pawn, Color::Black),
+    (File::A, Rank::Eight, PieceKind::Rook, Color::Black),
+    (File::B, Rank::Eight, PieceKind::Knight, Color::Black),
+    (File::C, Rank::Eight, PieceKind::Bishop, Color::Black),
+    (File::D, Rank::Eight, PieceKind::Queen, Color::Black),
+    (File::E, Rank::Eight, PieceKind::King, Color::Black),
+    (File::F, Rank::Eight, PieceKind::Bishop, Color::Black),
+    (File::G, Rank::Eight, PieceKind::Knight, Color::Black),
+    (File::H, Rank::Eight, PieceKind::Rook, Color::Black),
+];
+
+#[derive(
+    Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Deserialize, serde::Serialize,
+)]
+#[serde(transparent)]
+struct GameId {
+    inner: Uuid,
+}
+
+impl GameId {
+    fn new() -> Self {
+        GameId {
+            inner: Uuid::new_v4(),
+        }
+    }
+}
+
+#[derive(Clone, serde::Deserialize, serde::Serialize)]
+struct Piece {
+    kind: PieceKind,
+    color: Color,
+}
+
+#[derive(serde::Deserialize, serde::Serialize)]
+struct Coordinates {
+    file: File,
+    rank: Rank,
+}
+
+#[derive(serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Move {
+    piece: Piece,
+    from: Coordinates,
+    to: Coordinates,
+    game_id: GameId,
+}
+
+#[derive(serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Start {
+    player_color: String,
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+enum Color {
+    Black,
+    White,
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+enum PieceKind {
+    Pawn,
+    Rook,
+    Knight,
+    Bishop,
+    Queen,
+    King,
+}
+
+#[derive(
+    Clone,
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    Hash,
+    serde_repr::Deserialize_repr,
+    serde_repr::Serialize_repr,
+)]
+#[repr(u8)]
+enum Rank {
+    One = 1,
+    Two = 2,
+    Three = 3,
+    Four = 4,
+    Five = 5,
+    Six = 6,
+    Seven = 7,
+    Eight = 8,
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+enum File {
+    A,
+    B,
+    C,
+    D,
+    E,
+    F,
+    G,
+    H,
+}
+
+#[derive(Clone, Default)]
+struct FileState {
+    inner: HashMap<Rank, Piece>,
+}
+
+#[derive(Clone, Default)]
+struct BoardState {
+    inner: HashMap<File, FileState>,
+}
+
+impl BoardState {
+    fn starting_positions() -> Self {
+        let mut this = Self::default();
+
+        for (file, rank, kind, color) in INITIAL_PIECES {
+            let rank_entry = this.inner.entry(file).or_default();
+
+            rank_entry.inner.insert(rank, Piece { kind, color });
+        }
+
+        this
+    }
+
+    fn to_serializable(&self) -> Vec<(File, Rank, PieceKind, Color)> {
+        self.inner
+            .iter()
+            .flat_map(|(file, ranks)| {
+                ranks.inner.iter().map(|(rank, piece)| {
+                    (
+                        file.clone(),
+                        rank.clone(),
+                        piece.kind.clone(),
+                        piece.color.clone(),
+                    )
+                })
+            })
+            .collect()
+    }
+}
+
+struct Reply {
+    board_state: BoardState,
+}
+
+struct MoveSession {
+    action: Move,
+    reply: tokio::sync::oneshot::Sender<Reply>,
+}
+
+#[derive(serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+struct GameStart {
+    board: Vec<(File, Rank, PieceKind, Color)>,
+    game_id: GameId,
+}
+
+#[derive(Clone, Debug)]
+struct GameData {
+    sender: Sender<MoveSession>,
+}
+
+#[derive(Clone, Default)]
+struct GameState {
+    inner: Arc<Mutex<HashMap<GameId, GameData>>>,
+}
+
+impl GameState {
+    fn data_for_id(&self, game_id: &GameId) -> Option<GameData> {
+        self.inner.lock().unwrap().get(&game_id).cloned()
+    }
+}
+
+struct GameDropper(GameState, GameId);
+
+impl Drop for GameDropper {
+    fn drop(&mut self) {
+        self.0.inner.lock().unwrap().remove(&self.1);
+    }
+}
+
+async fn start(start: Json<Start>, game_state: Data<GameState>) -> impl Responder {
+    let game_id = GameId::new();
+
+    let (tx, mut rx) = tokio::sync::mpsc::channel(1);
+
+    let initial_board_state = BoardState::starting_positions();
+
+    let board_state = initial_board_state.clone();
+    let game_dropper = GameDropper((**game_state).clone(), game_id.clone());
+
+    let game_data = GameData { sender: tx };
+
+    game_state
+        .inner
+        .lock()
+        .unwrap()
+        .insert(game_id.clone(), game_data);
+
+    actix_web::rt::spawn(async move {
+        while let Ok(Some(msg)) =
+            actix_web::rt::time::timeout(Duration::from_secs(60 * 5), rx.recv()).await
+        {
+            /* do stuff */
+
+            let _ = msg.reply.send(Reply {
+                board_state: board_state.clone(),
+            });
+        }
+
+        drop(game_dropper);
+    });
+
+    HttpResponse::Ok().json(GameStart {
+        board: initial_board_state.to_serializable(),
+        game_id,
+    })
+}
+
+async fn make_move(action: Json<Move>, game_state: Data<GameState>) -> impl Responder {
+    if let Some(data) = game_state.data_for_id(&action.0.game_id) {
+        let (tx, rx) = tokio::sync::oneshot::channel();
+
+        let res = data
+            .sender
+            .send(MoveSession {
+                action: action.into_inner(),
+                reply: tx,
+            })
+            .await;
+
+        if res.is_err() {
+            return HttpResponse::InternalServerError().finish();
+        }
+
+        if let Ok(reply) = rx.await {
+            return HttpResponse::Ok().json(reply.board_state.to_serializable());
+        }
+
+        return HttpResponse::InternalServerError().finish();
+    }
+
+    HttpResponse::BadRequest().finish()
+}
+
+fn init_tracing() -> Result<(), Box<dyn std::error::Error>> {
+    LogTracer::init()?;
+
+    let targets: Targets = std::env::var("RUST_LOG")
+        .unwrap_or_else(|_| "info".into())
+        .parse()?;
+
+    let fmt_layer = tracing_subscriber::fmt::layer()
+        .with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
+        .pretty();
+
+    let subscriber = Registry::default().with(targets).with(fmt_layer);
+
+    set_global_default(subscriber)?;
+
+    Ok(())
+}
+
+#[actix_web::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    init_tracing()?;
+
+    HttpServer::new(|| {
+        App::new()
+            .app_data(Data::new(GameState::default()))
+            .wrap(TracingLogger::default())
+            .route("/start", actix_web::web::post().to(start))
+            .route("/move", actix_web::web::post().to(make_move))
+    })
+    .bind("0.0.0.0:8000")?
+    .run()
+    .await?;
+
+    Ok(())
+}