fn apply_conn_mutation<F>(&mut self, key: ConnMapKey, mut_fn: F)
    where
        F: FnOnce(&mut MuxerConnection),
    {
        if let Some(conn) = self.conn_map.get_mut(&key) {
            let had_rx = conn.has_pending_rx();
            let was_expiring = conn.will_expire();
            let prev_state = conn.state();

            mut_fn(conn);

            // If this is a host-initiated connection that has just become established, we'll have
            // to send an ack message to the host end.
            if prev_state == ConnState::LocalInit && conn.state() == ConnState::Established {
                conn.send_bytes(format!("OK {}\n", key.local_port).as_bytes())
                    .unwrap_or_else(|err| {
                        conn.kill();
                        warn!("vsock: unable to ack host connection: {:?}", err);
                    });
            }

            // If the connection wasn't previously scheduled for RX, add it to our RX queue.
            if !had_rx && conn.has_pending_rx() {
                self.rxq.push(MuxerRx::ConnRx(key));
            }

            // If the connection wasn't previously scheduled for termination, add it to the
            // kill queue.
            if !was_expiring && conn.will_expire() {
                // It's safe to unwrap here, since `conn.will_expire()` already guaranteed that
                // an `conn.expiry` is available.
                self.killq.push(key, conn.expiry().unwrap());
            }

            let fd = conn.as_raw_fd();
            let new_evset = conn.get_polled_evset();
            if new_evset.is_empty() {
                // If the connection no longer needs epoll notifications, remove its listener
                // from our list.
                self.remove_listener(fd);
                return;
            }
            if let Some(EpollListener::Connection { evset, .. }) = self.listener_map.get_mut(&fd) {
                if *evset != new_evset {
                    // If the set of events that the connection is interested in has changed,
                    // we need to update its epoll listener.
                    debug!(
                        "vsock: updating listener for (lp={}, pp={}): old={:?}, new={:?}",
                        key.local_port, key.peer_port, *evset, new_evset
                    );

                    *evset = new_evset;
                    self.epoll
                        .ctl(
                            ControlOperation::Modify,
                            fd,
                            &EpollEvent::new(new_evset, fd as u64),
                        )
                        .unwrap_or_else(|err| {
                            // This really shouldn't happen, like, ever. However, "famous last
                            // words" and all that, so let's just kill it with fire, and walk away.
                            self.kill_connection(key);
                            error!(
                                "vsock: error updating epoll listener for (lp={}, pp={}): {:?}",
                                key.local_port, key.peer_port, err
                            );
                        });
                }
            } else {
                // The connection had previously asked to be removed from the listener map (by
                // returning an empty event set via `get_polled_fd()`), but now wants back in.
                self.add_listener(
                    fd,
                    EpollListener::Connection {
                        key,
                        evset: new_evset,
                    },
                )
                .unwrap_or_else(|err| {
                    self.kill_connection(key);
                    error!(
                        "vsock: error updating epoll listener for (lp={}, pp={}): {:?}",
                        key.local_port, key.peer_port, err
                    );
                });
            }
        }
    }
/// Perform an action that might mutate a connection's state.
///
/// This is used as shorthand for repetitive tasks that need to be performed after a
/// connection object mutates. E.g.
/// - update the connection's epoll listener;
/// - schedule the connection to be queried for RX data;
/// - kill the connection if an unrecoverable error occurs.
Perform an action that might mutate a connection's state.
This is used as shorthand for repetitive tasks that need to be performed after a
connection object mutates.
Perform an action that might mutate a connection ' s state . This is used as shorthand for repetitive tasks that need to be performed after a connection object mutates .
fn apply_conn_mutation<F>(&mut self, key: ConnMapKey, mut_fn: F)
    where
        F: FnOnce(&mut MuxerConnection),
    {
        if let Some(conn) = self.conn_map.get_mut(&key) {
            let had_rx = conn.has_pending_rx();
            let was_expiring = conn.will_expire();
            let prev_state = conn.state();
            mut_fn(conn);
            // If this is a host-initiated connection that has just become established, we'll have
            // to send an ack message to the host end.
            if prev_state == ConnState::LocalInit && conn.state() == ConnState::Established {
                conn.send_bytes(format!("OK {}\n", key.local_port).as_bytes())
                    .unwrap_or_else(|err| {
                        conn.kill();
                        warn!("vsock: unable to ack host connection: {:?}", err);
                    });
            }
            // If the connection wasn't previously scheduled for RX, add it to our RX queue.
            if !had_rx && conn.has_pending_rx() {
                self.rxq.push(MuxerRx::ConnRx(key));
            }
            // If the connection wasn't previously scheduled for termination, add it to the
            // kill queue.
            if !was_expiring && conn.will_expire() {
                // It's safe to unwrap here, since `conn.will_expire()` already guaranteed that
                // an `conn.expiry` is available.
                self.killq.push(key, conn.expiry().unwrap());
            }
            let fd = conn.as_raw_fd();
            let new_evset = conn.get_polled_evset();
            if new_evset.is_empty() {
                // If the connection no longer needs epoll notifications, remove its listener
                // from our list.
                self.remove_listener(fd);
                return;
            }
            if let Some(EpollListener::Connection { evset, .. }) = self.listener_map.get_mut(&fd) {
                if *evset != new_evset {
                    // If the set of events that the connection is interested in has changed,
                    // we need to update its epoll listener.
                    debug!(
                        "vsock: updating listener for (lp={}, pp={}): old={:?}, new={:?}",
                        key.local_port, key.peer_port, *evset, new_evset
                    );
                    *evset = new_evset;
                    self.epoll
                        .ctl(
                            ControlOperation::Modify,
                            fd,
                            &EpollEvent::new(new_evset, fd as u64),
                        )
                        .unwrap_or_else(|err| {
                            // This really shouldn't happen, like, ever. However, "famous last
                            // words" and all that, so let's just kill it with fire, and walk away.
                            self.kill_connection(key);
                            error!(
                                "vsock: error updating epoll listener for (lp={}, pp={}): {:?}",
                                key.local_port, key.peer_port, err
                            );
                        });
                }
            } else {
                // The connection had previously asked to be removed from the listener map (by
                // returning an empty event set via `get_polled_fd()`), but now wants back in.
                self.add_listener(
                    fd,
                    EpollListener::Connection {
                        key,
                        evset: new_evset,
                    },
                )
                .unwrap_or_else(|err| {
                    self.kill_connection(key);
                    error!(
                        "vsock: error updating epoll listener for (lp={}, pp={}): {:?}",
                        key.local_port, key.peer_port, err
                    );
                });
            }
        }
    }
fn apply_conn_mutation < F > ( & mut self , key : ConnMapKey , mut_fn : F ) where F : FnOnce ( & mut MuxerConnection ) , { if let Some ( conn ) = self . conn_map . get_mut ( & key ) { let had_rx = conn . has_pending_rx ( ) ; let was_expiring = conn . will_expire ( ) ; let prev_state = conn . state ( ) ; mut_fn ( conn ) ; // If this is a host-initiated connection that has just become established, we'll have // to send an ack message to the host end. if prev_state == ConnState :: LocalInit && conn . state ( ) == ConnState :: Established { conn . send_bytes ( format ! ( " \n " key local_port ) . as_bytes ( ) ) . unwrap_or_else ( | err | { conn . kill ( ) ; warn ! ( " " err ) ; } ) ; } // If the connection wasn't previously scheduled for RX, add it to our RX queue. if ! had_rx && conn . has_pending_rx ( ) { self . rxq . push ( MuxerRx :: ConnRx ( key ) ) ; } // If the connection wasn't previously scheduled for termination, add it to the // kill queue. if ! was_expiring && conn . will_expire ( ) { // It's safe to unwrap here, since `conn.will_expire()` already guaranteed that // an `conn.expiry` is available. self . killq . push ( key , conn . expiry ( ) . unwrap ( ) ) ; } let fd = conn . as_raw_fd ( ) ; let new_evset = conn . get_polled_evset ( ) ; if new_evset . is_empty ( ) { // If the connection no longer needs epoll notifications, remove its listener // from our list. self . remove_listener ( fd ) ; return ; } if let Some ( EpollListener :: Connection { evset , .. } ) = self . listener_map . get_mut ( & fd ) { if * evset != new_evset { // If the set of events that the connection is interested in has changed, // we need to update its epoll listener. debug ! ( " " key local_port key peer_port evset new_evset ) ; * evset = new_evset ; self . epoll . ctl ( ControlOperation :: Modify , fd , & EpollEvent :: new ( new_evset , fd as u64 ) , ) . unwrap_or_else ( | err | { // This really shouldn't happen, like, ever. However, "famous last // words" and all that, so let's just kill it with fire, and walk away. self . kill_connection ( key ) ; error ! ( " " key local_port key peer_port err ) ; } ) ; } } else { // The connection had previously asked to be removed from the listener map (by // returning an empty event set via `get_polled_fd()`), but now wants back in. self . add_listener ( fd , EpollListener :: Connection { key , evset : new_evset , } , ) . unwrap_or_else ( | err | { self . kill_connection ( key ) ; error ! ( " " key local_port key peer_port err ) ; } ) ; } } }
Perform an action that might mutate a connection's state.
Perform an action that might mutate a connection ' s state .
&mut self
key
ConnMapKey
mut_fn
F