add diesel as dep and add db infra

Cargo.toml

@@ -13,3 +13,4 @@ log = "0.4"
 pretty_env_logger = "0.4"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1"
+diesel = { version = "2.0.0", features = ["sqlite"] }

src/infra/mod.rs

+use diesel::{Connection, SqliteConnection};
+
+pub enum DbConn {
+    // Currently only sqlite Connection
+    SqliteConn(SqliteConnection),
+}
+
+impl DbConn {
+    pub fn establish_sqlite(database_url: &str) -> anyhow::Result<Self> {
+        Ok(Self::SqliteConn(SqliteConnection::establish(database_url)?))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::DbConn;
+
+    #[test]
+    fn test_establish_sqlite() {
+        let workspace = env!("CARGO_MANIFEST_DIR");
+        let db_url = format!("{}/ygopro-database/locales/zh-CN/cards.db", workspace);
+        let _conn = DbConn::establish_sqlite(&db_url).unwrap();
+    }
+}

src/main.rs

@@ -2,6 +2,7 @@ use std::{net::SocketAddr, str::FromStr};
 use warp::Filter;
 
 mod deck;
+mod infra;
 
 const ADDR: &str = "127.0.0.1:3030";