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use crate::Id;
use mqtt4bytes::{Packet, Publish, QoS, Subscribe};
use rumqttlog::{
Connection, ConnectionAck, Data, Event, Notification, Receiver, RecvError, SendError, Sender,
};
#[derive(Debug, thiserror::Error)]
pub enum LinkError {
#[error("Unexpected router message")]
NotConnectionAck(Notification),
#[error("Connack error {0}")]
ConnectionAck(String),
#[error("Channel send error")]
Send(#[from] SendError<(Id, Event)>),
#[error("Channel recv error")]
Recv(#[from] RecvError),
}
pub struct LinkTx {
id: usize,
router_tx: Sender<(Id, Event)>,
client_id: String,
}
impl LinkTx {
pub(crate) fn new(client_id: &str, router_tx: Sender<(Id, Event)>) -> LinkTx {
LinkTx {
id: 0,
router_tx,
client_id: client_id.to_owned(),
}
}
pub fn connect(&mut self, max_inflight_requests: usize) -> Result<LinkRx, LinkError> {
let (connection, link_rx) =
Connection::new_remote(&self.client_id, true, max_inflight_requests);
let message = (0, Event::Connect(connection));
self.router_tx.send(message).unwrap();
match link_rx.recv()? {
Notification::ConnectionAck(ack) => match ack {
ConnectionAck::Success((id, _, _)) => self.id = id,
ConnectionAck::Failure(reason) => return Err(LinkError::ConnectionAck(reason)),
},
message => return Err(LinkError::NotConnectionAck(message)),
};
let rx = LinkRx::new(self.id, self.router_tx.clone(), link_rx);
Ok(rx)
}
pub fn publish<S, V>(&mut self, topic: S, retain: bool, payload: V) -> Result<(), LinkError>
where
S: Into<String>,
V: Into<Vec<u8>>,
{
let mut publish = Publish::new(topic, QoS::AtLeastOnce, payload);
publish.retain = retain;
let message = Event::Data(vec![Packet::Publish(publish)]);
self.router_tx.send((self.id, message))?;
Ok(())
}
pub fn subscribe<S: Into<String>>(&mut self, filter: S) -> Result<(), LinkError> {
let subscribe = Subscribe::new(filter.into(), QoS::AtMostOnce);
let packet = Packet::Subscribe(subscribe);
let message = Event::Data(vec![packet]);
self.router_tx.send((self.id, message))?;
Ok(())
}
}
pub struct LinkRx {
id: usize,
router_tx: Sender<(Id, Event)>,
link_rx: Receiver<Notification>,
}
impl LinkRx {
pub(crate) fn new(
id: usize,
router_tx: Sender<(Id, Event)>,
link_rx: Receiver<Notification>,
) -> LinkRx {
LinkRx {
id,
router_tx,
link_rx,
}
}
pub fn recv(&mut self) -> Result<Option<Data>, LinkError> {
let message = self.link_rx.recv()?;
let message = self.handle_router_response(message)?;
Ok(message)
}
pub async fn async_recv(&mut self) -> Result<Option<Data>, LinkError> {
let message = self.link_rx.recv()?;
let message = self.handle_router_response(message)?;
Ok(message)
}
fn handle_router_response(&mut self, message: Notification) -> Result<Option<Data>, LinkError> {
match message {
Notification::ConnectionAck(_) => Ok(None),
Notification::Message(_) => {
unreachable!("Local links are always clean");
}
Notification::Data(reply) => {
trace!(
"{:11} {:14} Id = {}, Count = {}",
"data",
"reply",
self.id,
reply.payload.len()
);
Ok(Some(reply))
}
Notification::Pause => {
let message = (self.id, Event::Ready);
self.router_tx.send(message)?;
Ok(None)
}
notification => {
warn!("{:?} not supported in local link", notification);
Ok(None)
}
}
}
}