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