add tcp user timeout config knob

tokio-postgres/Cargo.toml

@@ -56,7 +56,7 @@ phf = "0.11"
 postgres-protocol = { version = "0.6.4", path = "../postgres-protocol" }
 postgres-types = { version = "0.2.4", path = "../postgres-types" }
 serde = { version = "1.0", optional = true }
-socket2 = "0.4"
+socket2 = { version = "0.4", features = ["all"] }
 tokio = { version = "1.0", features = ["io-util"] }
 tokio-util = { version = "0.7", features = ["codec"] }
 

tokio-postgres/src/cancel_query.rs

@@ -38,6 +38,7 @@ where
         &config.host,
         config.port,
         config.connect_timeout,
+        config.tcp_user_timeout,
         config.keepalive.as_ref(),
     )
     .await?;

tokio-postgres/src/client.rs

@@ -158,6 +158,7 @@ pub(crate) struct SocketConfig {
     pub host: Host,
     pub port: u16,
     pub connect_timeout: Option<Duration>,
+    pub tcp_user_timeout: Option<Duration>,
     pub keepalive: Option<KeepaliveConfig>,
 }
 

tokio-postgres/src/config.rs

@@ -116,6 +116,9 @@ pub enum Host {
 ///     omitted or the empty string.
 /// * `connect_timeout` - The time limit in seconds applied to each socket-level connection attempt. Note that hostnames
 ///     can resolve to multiple IP addresses, and this limit is applied to each address. Defaults to no timeout.
+/// * `tcp_user_timeout` - The time limit that transmitted data may remain unacknowledged before a connection is forcibly closed.
+///     This is ignored for Unix domain socket connections. It is only supported on systems where TCP_USER_TIMEOUT is available
+///     and will default to the system default if omitted or set to 0; on other systems, it has no effect.
 /// * `keepalives` - Controls the use of TCP keepalive. A value of 0 disables keepalive and nonzero integers enable it.
 ///     This option is ignored when connecting with Unix sockets. Defaults to on.
 /// * `keepalives_idle` - The number of seconds of inactivity after which a keepalive message is sent to the server.
@@ -183,6 +186,7 @@ pub struct Config {
     pub(crate) host: Vec<Host>,
     pub(crate) port: Vec<u16>,
     pub(crate) connect_timeout: Option<Duration>,
+    pub(crate) tcp_user_timeout: Option<Duration>,
     pub(crate) keepalives: bool,
     pub(crate) keepalive_config: KeepaliveConfig,
     pub(crate) target_session_attrs: TargetSessionAttrs,
@@ -217,6 +221,7 @@ impl Config {
             host: vec![],
             port: vec![],
             connect_timeout: None,
+            tcp_user_timeout: None,
             keepalives: true,
             keepalive_config,
             target_session_attrs: TargetSessionAttrs::Any,
@@ -407,6 +412,21 @@ impl Config {
         self.connect_timeout.as_ref()
     }
 
+    /// Sets the TCP user timeout.
+    ///
+    /// This is ignored for Unix domain socket connections. It is only supported on systems where
+    /// TCP_USER_TIMEOUT is available and will default to the system default if omitted or set to 0;
+    /// on other systems, it has no effect.
+    pub fn tcp_user_timeout(&mut self, tcp_user_timeout: Duration) -> &mut Config {
+        self.tcp_user_timeout = Some(tcp_user_timeout);
+        self
+    }
+
+    /// Gets the TCP user timeout, if one has been set with the
+    /// `user_timeout` method.
+    pub fn get_tcp_user_timeout(&self) -> Option<&Duration> {
+        self.tcp_user_timeout.as_ref()
+    }
     /// Controls the use of TCP keepalive.
     ///
     /// This is ignored for Unix domain socket connections. Defaults to `true`.
@@ -578,6 +598,14 @@ impl Config {
                     self.connect_timeout(Duration::from_secs(timeout as u64));
                 }
             }
+            "tcp_user_timeout" => {
+                let timeout = value
+                    .parse::<i64>()
+                    .map_err(|_| Error::config_parse(Box::new(InvalidValue("tcp_user_timeout"))))?;
+                if timeout > 0 {
+                    self.tcp_user_timeout(Duration::from_secs(timeout as u64));
+                }
+            }
             "keepalives" => {
                 let keepalives = value
                     .parse::<u64>()
@@ -713,6 +741,7 @@ impl fmt::Debug for Config {
             .field("host", &self.host)
             .field("port", &self.port)
             .field("connect_timeout", &self.connect_timeout)
+            .field("tcp_user_timeout", &self.tcp_user_timeout)
             .field("keepalives", &self.keepalives)
             .field("keepalives_idle", &self.keepalive_config.idle)
             .field("keepalives_interval", &self.keepalive_config.interval)

tokio-postgres/src/connect.rs

@@ -65,6 +65,7 @@ where
         host,
         port,
         config.connect_timeout,
+        config.tcp_user_timeout,
         if config.keepalives {
             Some(&config.keepalive_config)
         } else {
@@ -118,6 +119,7 @@ where
         host: host.clone(),
         port,
         connect_timeout: config.connect_timeout,
+        tcp_user_timeout: config.tcp_user_timeout,
         keepalive: if config.keepalives {
             Some(config.keepalive_config.clone())
         } else {

tokio-postgres/src/connect_socket.rs

@@ -14,6 +14,7 @@ pub(crate) async fn connect_socket(
     host: &Host,
     port: u16,
     connect_timeout: Option<Duration>,
+    tcp_user_timeout: Option<Duration>,
     keepalive_config: Option<&KeepaliveConfig>,
 ) -> Result<Socket, Error> {
     match host {
@@ -35,8 +36,17 @@ pub(crate) async fn connect_socket(
                     };
 
                 stream.set_nodelay(true).map_err(Error::connect)?;
+
+                let sock_ref = SockRef::from(&stream);
+                #[cfg(target_os = "linux")]
+                {
+                    sock_ref
+                        .set_tcp_user_timeout(tcp_user_timeout)
+                        .map_err(Error::connect)?;
+                }
+
                 if let Some(keepalive_config) = keepalive_config {
-                    SockRef::from(&stream)
+                    sock_ref
                         .set_tcp_keepalive(&TcpKeepalive::from(keepalive_config))
                         .map_err(Error::connect)?;
                 }