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//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
use std::sync::Arc;
use futures::lock::Mutex;
use futures::StreamExt;
use tokio_util::codec::FramedRead;
use tracing::Instrument;
use yoke::Yoke;
use super::InnerClient;
use crate::codecs::MqttPacketCodec;
use crate::packet_identifier::PacketIdentifier;
use crate::packets::MqttPacket;
use crate::packets::MqttWriter;
use crate::packets::StableBytes;
use crate::transport::MqttConnection;
pub(super) async fn handle_background_receiving(
inner_clone: Arc<Mutex<InnerClient>>,
mut conn_read: FramedRead<tokio::io::ReadHalf<MqttConnection>, MqttPacketCodec>,
conn_read_sender: futures::channel::oneshot::Sender<
FramedRead<tokio::io::ReadHalf<MqttConnection>, MqttPacketCodec>,
>,
) -> Result<(), ()> {
tracing::info!("Starting background task");
let inner: Arc<Mutex<InnerClient>> = inner_clone;
while let Some(next) = conn_read.next().await {
let process_span = tracing::debug_span!(
"Processing packet",
packet_kind = tracing::field::Empty,
packet_identifier = tracing::field::Empty
);
tracing::debug!(parent: &process_span, valid = next.is_ok(), "Received packet");
let packet = match next {
Ok(packet) => packet,
Err(e) => panic!("Received err: {e}"),
};
process_span.record(
"packet_kind",
tracing::field::debug(packet.get().get_kind()),
);
match packet.get() {
mqtt_format::v5::packets::MqttPacket::Auth(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Disconnect(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Pingreq(pingreq) => {
handle_pingreq(pingreq).instrument(process_span).await?
}
mqtt_format::v5::packets::MqttPacket::Pingresp(pingresp) => {
handle_pingresp(pingresp, &inner)
.instrument(process_span)
.await?
}
mqtt_format::v5::packets::MqttPacket::Puback(mpuback) => {
handle_puback(mpuback, &inner, &packet)
.instrument(process_span)
.await?
}
mqtt_format::v5::packets::MqttPacket::Pubrec(pubrec) => {
handle_pubrec(pubrec, &inner, &packet)
.instrument(process_span)
.await?
}
mqtt_format::v5::packets::MqttPacket::Pubcomp(pubcomp) => {
handle_pubcomp(pubcomp, &inner, &packet)
.instrument(process_span)
.await?
}
mqtt_format::v5::packets::MqttPacket::Publish(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Pubrel(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Suback(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Unsuback(_) => todo!(),
mqtt_format::v5::packets::MqttPacket::Connack(_)
| mqtt_format::v5::packets::MqttPacket::Connect(_)
| mqtt_format::v5::packets::MqttPacket::Subscribe(_)
| mqtt_format::v5::packets::MqttPacket::Unsubscribe(_) => {
todo!("Handle invalid packet")
}
}
}
tracing::debug!("Finished processing, returning reader");
if let Err(_conn_read) = conn_read_sender.send(conn_read) {
tracing::error!("Failed to return reader");
todo!()
}
Ok(())
}
async fn handle_pingresp(
_pingresp: &mqtt_format::v5::packets::pingresp::MPingresp,
inner: &Arc<Mutex<InnerClient>>,
) -> Result<(), ()> {
let mut inner = inner.lock().await;
let inner = &mut *inner;
if let Some(cb) = inner.outstanding_callbacks.take_ping_req() {
if cb.send(()).is_err() {
tracing::debug!("PingReq completion handler was dropped before receiving response")
}
} else {
tracing::warn!("Received an unwarranted PingResp from the server, continuing")
}
Ok(())
}
async fn handle_pingreq(_pingreq: &mqtt_format::v5::packets::pingreq::MPingreq) -> Result<(), ()> {
tracing::warn!("Received an unwarranted PingReq from the server. This is unclear in the spec. Ignoring and continuing...");
Ok(())
}
async fn handle_pubcomp(
pubcomp: &mqtt_format::v5::packets::pubcomp::MPubcomp<'_>,
inner: &Arc<Mutex<InnerClient>>,
packet: &MqttPacket,
) -> Result<(), ()> {
match pubcomp.reason {
mqtt_format::v5::packets::pubcomp::PubcompReasonCode::Success => {
let mut inner = inner.lock().await;
let inner = &mut *inner;
let Some(ref mut session_state) = inner.session_state else {
tracing::error!("No session state found");
todo!()
};
let pident = PacketIdentifier::from(pubcomp.packet_identifier);
tracing::Span::current().record("packet_identifier", tracing::field::display(pident));
if session_state
.outstanding_packets
.exists_outstanding_packet(pident)
{
session_state.outstanding_packets.remove_by_id(pident);
tracing::trace!("Removed packet id from outstanding packets");
if let Some(callback) = inner.outstanding_callbacks.take_qos2_complete(pident) {
if let Err(_) = callback.on_complete.send(packet.clone()) {
tracing::trace!("Could not send ack, receiver was dropped.")
}
} else {
todo!("Invariant broken: Received on_complete for unknown packet")
}
}
}
_ => todo!("Handle errors"),
}
Ok(())
}
async fn handle_puback(
mpuback: &mqtt_format::v5::packets::puback::MPuback<'_>,
inner: &Arc<Mutex<InnerClient>>,
packet: &MqttPacket,
) -> Result<(), ()> {
match mpuback.reason {
mqtt_format::v5::packets::puback::PubackReasonCode::Success
| mqtt_format::v5::packets::puback::PubackReasonCode::NoMatchingSubscribers => {
let mut inner = inner.lock().await;
let inner = &mut *inner;
let Some(ref mut session_state) = inner.session_state else {
tracing::error!("No session state found");
todo!()
};
let pident = PacketIdentifier::try_from(mpuback.packet_identifier)
.expect("Zero PacketIdentifier not valid here");
tracing::Span::current().record("packet_identifier", tracing::field::display(pident));
if session_state
.outstanding_packets
.exists_outstanding_packet(pident)
{
session_state.outstanding_packets.remove_by_id(pident);
tracing::trace!("Removed packet id from outstanding packets");
if let Some(callback) = inner.outstanding_callbacks.take_qos1(pident) {
if let Err(_) = callback.on_acknowledge.send(packet.clone()) {
tracing::trace!("Could not send ack, receiver was dropped.")
}
}
} else {
tracing::error!("Packet id does not exist in outstanding packets");
todo!()
}
// TODO: Forward mpuback.properties etc to the user
}
_ => todo!("Handle errors"),
}
Ok(())
}
async fn handle_pubrec(
pubrec: &mqtt_format::v5::packets::pubrec::MPubrec<'_>,
inner: &Arc<Mutex<InnerClient>>,
packet: &MqttPacket,
) -> Result<(), ()> {
match pubrec.reason {
mqtt_format::v5::packets::pubrec::PubrecReasonCode::Success => {
let mut inner = inner.lock().await;
let inner = &mut *inner;
let Some(ref mut session_state) = inner.session_state else {
tracing::error!("No session state found");
todo!()
};
let Some(ref mut conn_state) = inner.connection_state else {
tracing::error!("No session state found");
todo!()
};
let pident = PacketIdentifier::try_from(pubrec.packet_identifier)
.expect("zero PacketIdentifier not valid here");
tracing::Span::current().record("packet_identifier", tracing::field::display(pident));
if session_state
.outstanding_packets
.exists_outstanding_packet(pident)
{
let pubrel = mqtt_format::v5::packets::MqttPacket::Pubrel(
mqtt_format::v5::packets::pubrel::MPubrel {
packet_identifier: pubrec.packet_identifier,
reason: mqtt_format::v5::packets::pubr
|
