endpoint: allow override server configuration

Author: BiagioFesta

quinn-proto/src/endpoint.rs

@@ -109,6 +109,11 @@ where
         self.transmits.pop_front()
     }
 
+    /// Replace the server configuration, affecting new incoming connections only
+    pub fn set_server_config(&mut self, server_config: Option<Arc<ServerConfig<S>>>) {
+        self.server_config = server_config;
+    }
+
     /// Process `EndpointEvent`s emitted from related `Connection`s
     ///
     /// In turn, processing this event may return a `ConnectionEvent` for the same `Connection`.

quinn/src/endpoint.rs

@@ -17,7 +17,11 @@ use futures_channel::mpsc;
 use futures_util::StreamExt;
 use fxhash::FxHashMap;
 use once_cell::sync::OnceCell;
-use proto::{self as proto, generic::ClientConfig, ConnectError, ConnectionHandle, DatagramEvent};
+use proto::{
+    self as proto,
+    generic::{ClientConfig, ServerConfig},
+    ConnectError, ConnectionHandle, DatagramEvent,
+};
 
 use crate::{
     broadcast::{self, Broadcast},
@@ -116,6 +120,18 @@ where
         Ok(())
     }
 
+    /// Set the server configuration overriding the existing one.
+    /// If this endpoint has been built without a server configuration, it does nothing.
+    ///
+    /// Useful for e.g. refreshing TLS certificates without disrupting existing connections.
+    pub fn set_server_config(&self, server_config: Option<ServerConfig<S>>) {
+        self.inner
+            .lock()
+            .unwrap()
+            .inner
+            .set_server_config(server_config.map(Arc::new))
+    }
+
     /// Get the local `SocketAddr` the underlying socket is bound to
     pub fn local_addr(&self) -> io::Result<SocketAddr> {
         self.inner.lock().unwrap().socket.local_addr()