Separate command and query

backend/src/pool.rs

@@ -0,0 +1,51 @@
+use std::path::Path;
+use std::str::FromStr;
+
+use anyhow::Result;
+use sqlx::{
+    SqlitePool,
+    sqlite::{SqliteConnectOptions, SqlitePoolOptions},
+};
+
+pub async fn create_pool() -> Result<SqlitePool> {
+    let raw_database_url = std::env::var("DATABASE_URL")
+        .unwrap_or_else(|_| format!("sqlite://{}/data/caravel.db", env!("CARGO_MANIFEST_DIR")));
+    let database_url = normalize_sqlite_url(&raw_database_url);
+
+    if let Some(path) = database_url.strip_prefix("sqlite://")
+        && !path.is_empty()
+        && path != ":memory:"
+        && let Some(parent) = Path::new(path).parent()
+        && !parent.as_os_str().is_empty()
+    {
+        std::fs::create_dir_all(parent)?;
+    }
+
+    let connect_options =
+        SqliteConnectOptions::from_str(&database_url)?.create_if_missing(true);
+
+    let pool = SqlitePoolOptions::new()
+        .max_connections(5)
+        .connect_with(connect_options)
+        .await?;
+
+    sqlx::query("PRAGMA journal_mode = WAL;")
+        .execute(&pool)
+        .await?;
+
+    sqlx::migrate!("./migrations").run(&pool).await?;
+
+    Ok(pool)
+}
+
+fn normalize_sqlite_url(url: &str) -> String {
+    let Some(path) = url.strip_prefix("sqlite://") else {
+        return url.to_string();
+    };
+
+    if path.is_empty() || path == ":memory:" || Path::new(path).is_absolute() {
+        return url.to_string();
+    }
+
+    format!("sqlite://{}/{}", env!("CARGO_MANIFEST_DIR"), path)
+}