/// Selects an event from the client's requests, incoming packets from the
/// broker and keepalive ping cycle.
Selects an event from the client's requests, incoming packets from the
broker and keepalive ping cycle.
Selects an event from the client ' s requests incoming packets from the broker and keepalive ping cycle .
fn select_event<N: TcpClientStack<TcpSocket = S> + ?Sized>(
        &mut self,
        network: &mut N,
    ) -> nb::Result<Notification, EventError> {
        let now = self
            .last_outgoing_timer
            .try_now()
            .map_err(EventError::from)?;
        // Handle a request
        if self.should_handle_request() {
            if let Some(mut grant) = self.requests.read() {
                let mut packet = SerializedPacket(grant.deref_mut());
                match self.state.handle_outgoing_request(&mut packet, &now) {
                    Ok(()) => {
                        self.network_handle.send(network, packet.to_inner())?;
                        grant.release();
                        return Err(nb::Error::WouldBlock);
                    }
                    Err(crate::state::StateError::MaxMessagesInflight) => {}
                    Err(e) => return Err(nb::Error::Other(e.into())),
                }
            }
        }
        if self
            .state
            .last_ping_entry()
            .or_insert(now)
            .has_elapsed(&now, self.options.keep_alive_ms().milliseconds())
        {
            // Handle keepalive ping
            let packet = self
                .state
                .handle_outgoing_packet(Packet::Pingreq)
                .map_err(EventError::from)?;
            self.network_handle.send_packet(network, &packet)?;
            self.state.last_ping_entry().insert(now);
            return Err(nb::Error::WouldBlock);
        }
        // Handle an incoming packet
        let (notification, packet) = self
            .network_handle
            .receive(network)
            .map_err(|e| e.map(EventError::Network))?
            .decode(&mut self.state)?;
        // Handle `ack` of newly received incoming packet, if relevant
        if let Some(packet) = packet {
            self.network_handle.send_packet(network, &packet)?;
        }
        // By comparing the current time, select pending non-zero QoS publish
        // requests staying longer than the retry interval, and handle their
        // retrial.
        for (pid, inflight) in self.state.retries(now, 10_000.milliseconds()) {
            mqtt_log!(warn, "Retrying PID {:?}", pid);
            // Update inflight's timestamp for later retrials
            inflight.last_touch_entry().insert(now);
            let packet = inflight.packet(*pid).map_err(EventError::from)?;
            self.network_handle.send(network, &packet)?;
        }
        notification.ok_or(nb::Error::WouldBlock)
    }
fn select_event < N : TcpClientStack < TcpSocket = S > + ? Sized > ( & mut self , network : & mut N , ) -> nb :: Result < Notification , EventError > { let now = self . last_outgoing_timer . try_now ( ) . map_err ( EventError :: from ) ? ; // Handle a request if self . should_handle_request ( ) { if let Some ( mut grant ) = self . requests . read ( ) { let mut packet = SerializedPacket ( grant . deref_mut ( ) ) ; match self . state . handle_outgoing_request ( & mut packet , & now ) { Ok ( ( ) ) => { self . network_handle . send ( network , packet . to_inner ( ) ) ? ; grant . release ( ) ; return Err ( nb :: Error :: WouldBlock ) ; } Err ( crate :: state :: StateError :: MaxMessagesInflight ) => { } Err ( e ) => return Err ( nb :: Error :: Other ( e . into ( ) ) ) , } } } if self . state . last_ping_entry ( ) . or_insert ( now ) . has_elapsed ( & now , self . options . keep_alive_ms ( ) . milliseconds ( ) ) { // Handle keepalive ping let packet = self . state . handle_outgoing_packet ( Packet :: Pingreq ) . map_err ( EventError :: from ) ? ; self . network_handle . send_packet ( network , & packet ) ? ; self . state . last_ping_entry ( ) . insert ( now ) ; return Err ( nb :: Error :: WouldBlock ) ; } // Handle an incoming packet let ( notification , packet ) = self . network_handle . receive ( network ) . map_err ( | e | e . map ( EventError :: Network ) ) ? . decode ( & mut self . state ) ? ; // Handle `ack` of newly received incoming packet, if relevant if let Some ( packet ) = packet { self . network_handle . send_packet ( network , & packet ) ? ; } // By comparing the current time, select pending non-zero QoS publish // requests staying longer than the retry interval, and handle their // retrial. for ( pid , inflight ) in self . state . retries ( now , 10_000 . milliseconds ( ) ) { mqtt_log ! ( warn " " pid ) ; // Update inflight's timestamp for later retrials inflight . last_touch_entry ( ) . insert ( now ) ; let packet = inflight . packet ( * pid ) . map_err ( EventError :: from ) ? ; self . network_handle . send ( network , & packet ) ? ; } notification . ok_or ( nb :: Error :: WouldBlock ) }
Selects an event from the client's requests, incoming packets from the
broker and keepalive ping cycle.
Selects an event from the client ' s requests incoming packets from the broker and keepalive ping cycle .
&mut self
network
&mut N