feat(request-response): remove Config::set_connection_keep_alive

protocols/request-response/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 0.26.0 - unreleased
 
+- Remove `request_response::Config::set_connection_keep_alive` in favor of `SwarmBuilder::idle_connection_timeout`.
+  See [PR 4679](https://github.com/libp2p/rust-libp2p/pull/4679).
 
 ## 0.25.2
 

protocols/request-response/src/handler.rs

@@ -27,7 +27,6 @@ use crate::handler::protocol::{RequestProtocol, ResponseProtocol};
 use crate::{RequestId, EMPTY_QUEUE_SHRINK_THRESHOLD};
 
 use futures::{channel::oneshot, future::BoxFuture, prelude::*, stream::FuturesUnordered};
-use instant::Instant;
 use libp2p_swarm::handler::{
     ConnectionEvent, DialUpgradeError, FullyNegotiatedInbound, FullyNegotiatedOutbound,
     ListenUpgradeError,
@@ -57,9 +56,6 @@ where
     inbound_protocols: SmallVec<[TCodec::Protocol; 2]>,
     /// The request/response message codec.
     codec: TCodec,
-    /// The keep-alive timeout of idle connections. A connection is considered
-    /// idle if there are no outbound substreams.
-    keep_alive_timeout: Duration,
     /// The timeout for inbound and outbound substreams (i.e. request
     /// and response processing).
     substream_timeout: Duration,
@@ -92,15 +88,13 @@ where
     pub(super) fn new(
         inbound_protocols: SmallVec<[TCodec::Protocol; 2]>,
         codec: TCodec,
-        keep_alive_timeout: Duration,
         substream_timeout: Duration,
         inbound_request_id: Arc<AtomicU64>,
     ) -> Self {
         Self {
             inbound_protocols,
             codec,
             keep_alive: KeepAlive::Yes,
-            keep_alive_timeout,
             substream_timeout,
             outbound: VecDeque::new(),
             inbound: FuturesUnordered::new(),
@@ -336,13 +330,11 @@ where
             self.outbound.shrink_to_fit();
         }
 
-        #[allow(deprecated)]
         if self.inbound.is_empty() && self.keep_alive.is_yes() {
-            // No new inbound or outbound requests. However, we may just have
-            // started the latest inbound or outbound upgrade(s), so make sure
-            // the keep-alive timeout is preceded by the substream timeout.
-            let until = Instant::now() + self.substream_timeout + self.keep_alive_timeout;
-            self.keep_alive = KeepAlive::Until(until);
+            // No new inbound or outbound requests. We already check
+            // there is no active streams exist in swarm connection,
+            // so we can set keep-alive to no directly.
+            self.keep_alive = KeepAlive::No;
         }
 
         Poll::Pending

protocols/request-response/src/lib.rs

@@ -284,28 +284,17 @@
 #[derive(Debug, Clone)]
 pub struct Config {
     request_timeout: Duration,
-    connection_keep_alive: Duration,
 }
 
 impl Default for Config {
     fn default() -> Self {
         Self {
-            connection_keep_alive: Duration::from_secs(10),
             request_timeout: Duration::from_secs(10),
         }
     }
 }
 
 impl Config {
-    /// Sets the keep-alive timeout of idle connections.
-    #[deprecated(
-        note = "Set a global idle connection timeout via `SwarmBuilder::idle_connection_timeout` instead."
-    )]
-    pub fn set_connection_keep_alive(&mut self, v: Duration) -> &mut Self {
-        self.connection_keep_alive = v;
-        self
-    }
-
     /// Sets the timeout for inbound and outbound requests.
     pub fn set_request_timeout(&mut self, v: Duration) -> &mut Self {
         self.request_timeout = v;
@@ -717,7 +706,6 @@
             self.inbound_protocols.clone(),
             self.codec.clone(),
             self.config.request_timeout,
-            self.config.connection_keep_alive,
             self.next_inbound_id.clone(),
         );
 
@@ -756,11 +744,11 @@
         remote_address: &Multiaddr,
         _: Endpoint,
     ) -> Result<THandler<Self>, ConnectionDenied> {
         let mut handler = Handler::new(
             self.inbound_protocols.clone(),
             self.codec.clone(),
             self.config.request_timeout,
             self.config.connection_keep_alive,
             self.next_inbound_id.clone(),
         );