Don't suppress notices during startup flow

tokio-postgres/src/connect_raw.rs

@@ -13,7 +13,7 @@ use postgres_protocol::authentication::sasl;
 use postgres_protocol::authentication::sasl::ScramSha256;
 use postgres_protocol::message::backend::{AuthenticationSaslBody, Message};
 use postgres_protocol::message::frontend;
-use std::collections::HashMap;
+use std::collections::{HashMap, VecDeque};
 use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -23,6 +23,7 @@ use tokio_util::codec::Framed;
 pub struct StartupStream<S, T> {
     inner: Framed<MaybeTlsStream<S, T>, PostgresCodec>,
     buf: BackendMessages,
+    delayed: VecDeque<BackendMessage>,
 }
 
 impl<S, T> Sink<FrontendMessage> for StartupStream<S, T>
@@ -91,6 +92,7 @@ where
     let mut stream = StartupStream {
         inner: Framed::new(stream, PostgresCodec),
         buf: BackendMessages::empty(),
+        delayed: VecDeque::new(),
     };
 
     startup(&mut stream, config).await?;
@@ -99,7 +101,7 @@ where
 
     let (sender, receiver) = mpsc::unbounded();
     let client = Client::new(sender, config.ssl_mode, process_id, secret_key);
-    let connection = Connection::new(stream.inner, parameters, receiver);
+    let connection = Connection::new(stream.inner, stream.delayed, parameters, receiver);
 
     Ok((client, connection))
 }
@@ -332,7 +334,9 @@ where
                     body.value().map_err(Error::parse)?.to_string(),
                 );
             }
-            Some(Message::NoticeResponse(_)) => {}
+            Some(msg @ Message::NoticeResponse(_)) => {
+                stream.delayed.push_back(BackendMessage::Async(msg))
+            }
             Some(Message::ReadyForQuery(_)) => return Ok((process_id, secret_key, parameters)),
             Some(Message::ErrorResponse(body)) => return Err(Error::db(body)),
             Some(_) => return Err(Error::unexpected_message()),

tokio-postgres/src/connection.rs

@@ -52,7 +52,7 @@ pub struct Connection<S, T> {
     parameters: HashMap<String, String>,
     receiver: mpsc::UnboundedReceiver<Request>,
     pending_request: Option<RequestMessages>,
-    pending_response: Option<BackendMessage>,
+    pending_responses: VecDeque<BackendMessage>,
     responses: VecDeque<Response>,
     state: State,
 }
@@ -64,6 +64,7 @@ where
 {
     pub(crate) fn new(
         stream: Framed<MaybeTlsStream<S, T>, PostgresCodec>,
+        pending_responses: VecDeque<BackendMessage>,
         parameters: HashMap<String, String>,
         receiver: mpsc::UnboundedReceiver<Request>,
     ) -> Connection<S, T> {
@@ -72,7 +73,7 @@ where
             parameters,
             receiver,
             pending_request: None,
-            pending_response: None,
+            pending_responses,
             responses: VecDeque::new(),
             state: State::Active,
         }
@@ -82,7 +83,7 @@ where
         &mut self,
         cx: &mut Context<'_>,
     ) -> Poll<Option<Result<BackendMessage, Error>>> {
-        if let Some(message) = self.pending_response.take() {
+        if let Some(message) = self.pending_responses.pop_front() {
             trace!("retrying pending response");
             return Poll::Ready(Some(Ok(message)));
         }
@@ -158,7 +159,7 @@ where
                 }
                 Poll::Pending => {
                     self.responses.push_front(response);
-                    self.pending_response = Some(BackendMessage::Normal {
+                    self.pending_responses.push_back(BackendMessage::Normal {
                         messages,
                         request_complete,
                     });

tokio-postgres/tests/test/main.rs

@@ -570,6 +570,45 @@ async fn copy_out() {
     assert_eq!(&data[..], b"1\tjim\n2\tjoe\n");
 }
 
+#[tokio::test]
+async fn notices() {
+    let long_name = "x".repeat(65);
+    let (client, mut connection) =
+        connect_raw(&format!("user=postgres application_name={}", long_name,))
+            .await
+            .unwrap();
+
+    let (tx, rx) = mpsc::unbounded();
+    let stream = stream::poll_fn(move |cx| connection.poll_message(cx)).map_err(|e| panic!(e));
+    let connection = stream.forward(tx).map(|r| r.unwrap());
+    tokio::spawn(connection);
+
+    client
+        .batch_execute("DROP DATABASE IF EXISTS noexistdb")
+        .await
+        .unwrap();
+
+    drop(client);
+
+    let notices = rx
+        .filter_map(|m| match m {
+            AsyncMessage::Notice(n) => future::ready(Some(n)),
+            _ => future::ready(None),
+        })
+        .collect::<Vec<_>>()
+        .await;
+    assert_eq!(notices.len(), 2);
+    assert_eq!(
+        notices[0].message(),
+        "identifier \"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\" \
+         will be truncated to \"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\""
+    );
+    assert_eq!(
+        notices[1].message(),
+        "database \"noexistdb\" does not exist, skipping"
+    );
+}
+
 #[tokio::test]
 async fn notifications() {
     let (client, mut connection) = connect_raw("user=postgres").await.unwrap();