improve logging and avoid race

src/scheduler.rs

@@ -57,7 +57,9 @@ async fn inbox_loop(ctx: Context, inbox_handlers: ImapConnectionHandlers) {
         shutdown_sender,
     } = inbox_handlers;
 
+    let ctx1 = ctx.clone();
     let fut = async move {
+        let ctx = ctx1;
         if let Err(err) = connection.connect_configured(&ctx).await {
             error!(ctx, "{}", err);
             return;
@@ -106,6 +108,7 @@ async fn inbox_loop(ctx: Context, inbox_handlers: ImapConnectionHandlers) {
         }
     };
 
+    info!(ctx, "Shutting down inbox loop");
     fut.race(stop_receiver.recv().map(|_| ())).await;
     shutdown_sender.send(()).await;
 }
@@ -201,7 +204,7 @@ async fn smtp_loop(ctx: Context, smtp_handlers: SmtpConnectionHandlers) {
         }
     };
 
-    fut.race(stop_receiver.recv()).await;
+    fut.race(stop_receiver.recv()).await.ok();
     shutdown_sender.send(()).await;
 }
 
@@ -362,7 +365,7 @@ impl ConnectionState {
         // Trigger shutdown of the run loop.
         self.stop_sender.send(()).await;
         // Wait for a notification that the run loop has been shutdown.
-        self.shutdown_receiver.recv().await;
+        self.shutdown_receiver.recv().await.ok();
     }
 
     async fn interrupt(&self) {

src/sql.rs

@@ -181,7 +181,7 @@ impl Sql {
         let pool = lock.as_ref().ok_or_else(|| Error::SqlNoConnection)?;
         let conn = pool.get()?;
 
-        let res = async_std::task::spawn_blocking(move || g(conn)).await;
+        let res = g(conn);
         self.in_use.remove();
 
         res
@@ -419,7 +419,10 @@ impl Sql {
             let bt = backtrace::Backtrace::new();
             eprintln!("old query: {}", query);
             eprintln!("Connection is already used from this thread: {:?}", bt);
-            panic!("Connection is already used from this thread");
+            panic!(
+                "Connection is already used from this thread: trying to execute {}",
+                stmt.as_ref()
+            );
         }
 
         self.in_use.set(stmt.as_ref().to_string());