v1.17: quic: delay calling set_max_concurrent_uni_streams/set_receive_window (backport of #904) (#967)

* quic: delay calling set_max_concurrent_uni_streams/set_receive_window (#904)

* quic: don't call connection.set_max_concurrent_uni_streams if we're going to drop a connection

Avoids taking a mutex and waking a task.

* quic: don't increase the receive window before we've actually accepted a connection

(cherry picked from commit 2770424)

# Conflicts:
#	streamer/src/nonblocking/quic.rs

* Fix merge conflicts

---------

Co-authored-by: Alessandro Decina <[email protected]>

Author: 2 people

streamer/src/nonblocking/quic.rs

@@ -342,18 +342,12 @@ fn handle_and_cache_new_connection(
         params.total_stake,
     ) as u64)
     {
-        connection.set_max_concurrent_uni_streams(max_uni_streams);
         let receive_window = compute_recieve_window(
             params.max_stake,
             params.min_stake,
             connection_table_l.peer_type,
             params.stake,
         );
-
-        if let Ok(receive_window) = receive_window {
-            connection.set_receive_window(receive_window);
-        }
-
         let remote_addr = connection.remote_address();
 
         debug!(
@@ -376,6 +370,12 @@ fn handle_and_cache_new_connection(
         ) {
             let peer_type = connection_table_l.peer_type;
             drop(connection_table_l);
+
+            if let Ok(receive_window) = receive_window {
+                connection.set_receive_window(receive_window);
+            }
+            connection.set_max_concurrent_uni_streams(max_uni_streams);
+
             tokio::spawn(handle_connection(
                 connection,
                 remote_addr,