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use std::sync::Arc;
use tokio::sync::{Mutex as AsyncMutex, Semaphore};
use crate::config::Config;
/// Shared application state. The single SQLite connection is serialized behind
/// an async mutex; concurrent fetch/backtest work is bounded by semaphores.
pub struct AppState {
pub cfg: Config,
pub db: AsyncMutex<rusqlite::Connection>,
pub run_sem: Arc<Semaphore>,
pub fetch_sem: Arc<Semaphore>,
}
/// Fixed shared contract alias for handler arguments: the axum State extractor
/// over `Arc<AppState>`. Handlers take `cx: Cx`, helpers take `&Cx`.
pub type Cx = axum::extract::State<std::sync::Arc<AppState>>;
/// Legacy alias kept for modules (auth, projects, datasets) whose handlers take
/// the bare `Arc<AppState>`; both styles are valid extractors for this state.
pub type S = Arc<AppState>;
impl AppState {
/// Lock the connection, run the closure, return its result exactly.
/// Never `.await` inside the closure; keep transactions in ONE closure.
pub async fn with_db<R>(&self, f: impl FnOnce(&mut rusqlite::Connection) -> R) -> R {
let mut db = self.db.lock().await;
f(&mut db)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::config::Config;
#[tokio::test]
async fn with_db_returns_closure_result_and_composes() {
let cfg = Config::from_env();
let conn = rusqlite::Connection::open_in_memory().unwrap();
let st = AppState {
cfg: cfg.clone(),
db: AsyncMutex::new(conn),
run_sem: Arc::new(Semaphore::new(1)),
fetch_sem: Arc::new(Semaphore::new(1)),
};
let n: i64 = st.with_db(|db| {
db.execute("CREATE TABLE t(x INTEGER)", []).unwrap();
db.execute("INSERT INTO t VALUES (42)", []).unwrap();
db.query_row("SELECT SUM(x) FROM t", [], |r| r.get(0)).unwrap()
}).await;
assert_eq!(n, 42);
st.with_db(|_db| ()).await;
}
}
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