Open and close sqlite db properly

cove-tui/src/vault.rs

@@ -0,0 +1,44 @@
+use std::path::Path;
+use std::{fs, thread};
+
+use rusqlite::Connection;
+use tokio::sync::{mpsc, oneshot};
+
+enum Request {
+    Close(oneshot::Sender<()>),
+    Nop,
+}
+
+pub struct Vault {
+    tx: mpsc::Sender<Request>,
+}
+
+impl Vault {
+    pub async fn close(&self) {
+        let (tx, rx) = oneshot::channel();
+        let _ = self.tx.send(Request::Close(tx)).await;
+        let _ = rx.await;
+    }
+}
+
+fn run(conn: Connection, mut rx: mpsc::Receiver<Request>) -> anyhow::Result<()> {
+    while let Some(request) = rx.blocking_recv() {
+        match request {
+            // Drops the Sender resulting in `Vault::close` exiting
+            Request::Close(_) => break,
+            Request::Nop => {}
+        }
+    }
+    Ok(())
+}
+
+pub fn launch(path: &Path) -> rusqlite::Result<Vault> {
+    // If this fails, rusqlite will complain about not being able to open the db
+    // file, which saves me from adding a separate vault error type.
+    let _ = fs::create_dir_all(path.parent().expect("path to file"));
+
+    let conn = Connection::open(path)?;
+    let (tx, rx) = mpsc::channel(8);
+    thread::spawn(move || run(conn, rx));
+    Ok(Vault { tx })
+}