use std::fmt;
use std::marker::PhantomData;
use std::rc::Rc;
use std::time::Duration;
use futures::{SinkExt, StreamExt, TryFutureExt};
use ntex::channel::mpsc;
use ntex::codec::{AsyncRead, AsyncWrite, Framed};
use ntex::rt::time::Delay;
use ntex::service::{IntoServiceFactory, Service, ServiceFactory};
use ntex::util::framed::DispatcherError;
use ntex::util::timeout::{Timeout, TimeoutError};
use crate::error::MqttError;
use crate::handshake::{Handshake, HandshakeResult};
use crate::service::{FactoryBuilder, FactoryBuilder2};
use super::codec as mqtt;
use super::connect::{Connect, ConnectAck};
use super::control::{ControlPacket, ControlResult};
use super::default::{DefaultControlService, DefaultPublishService};
use super::dispatcher::factory;
use super::publish::Publish;
use super::sink::MqttSink;
use super::Session;
pub struct MqttServer<Io, St, C: ServiceFactory, Cn: ServiceFactory, P: ServiceFactory> {
connect: C,
control: Cn,
publish: P,
max_size: u32,
inflight: usize,
handshake_timeout: usize,
disconnect_timeout: usize,
_t: PhantomData<(Io, St)>,
}
impl<Io, St, C>
MqttServer<
Io,
St,
C,
DefaultControlService<St, C::Error>,
DefaultPublishService<St, C::Error>,
>
where
St: 'static,
C: ServiceFactory<Config = (), Request = Connect<Io>, Response = ConnectAck<Io, St>>
+ 'static,
C::Error: fmt::Debug,
{
pub fn new<F>(connect: F) -> Self
where
F: IntoServiceFactory<C>,
{
MqttServer {
connect: connect.into_factory(),
control: DefaultControlService::default(),
publish: DefaultPublishService::default(),
max_size: 0,
inflight: 15,
handshake_timeout: 0,
disconnect_timeout: 3000,
_t: PhantomData,
}
}
}
impl<Io, St, C, Cn, P> MqttServer<Io, St, C, Cn, P>
where
Io: AsyncRead + AsyncWrite + Unpin + 'static,
St: 'static,
C: ServiceFactory<Config = (), Request = Connect<Io>, Response = ConnectAck<Io, St>>
+ 'static,
Cn: ServiceFactory<Config = Session<St>, Request = ControlPacket, Response = ControlResult>
+ 'static,
P: ServiceFactory<Config = Session<St>, Request = Publish, Response = ()> + 'static,
C::Error: From<Cn::Error>
+ From<Cn::InitError>
+ From<P::Error>
+ From<P::InitError>
+ fmt::Debug,
{
pub fn handshake_timeout(mut self, timeout: usize) -> Self {
self.handshake_timeout = timeout;
self
}
pub fn disconnect_timeout(mut self, val: usize) -> Self {
self.disconnect_timeout = val;
self
}
pub fn max_size(mut self, size: u32) -> Self {
self.max_size = size;
self
}
pub fn inflight(mut self, val: usize) -> Self {
self.inflight = val;
self
}
pub fn control<F, Srv>(self, service: F) -> MqttServer<Io, St, C, Srv, P>
where
F: IntoServiceFactory<Srv>,
Srv: ServiceFactory<
Config = Session<St>,
Request = ControlPacket,
Response = ControlResult,
> + 'static,
C::Error: From<Srv::Error> + From<Srv::InitError>,
{
MqttServer {
connect: self.connect,
publish: self.publish,
control: service.into_factory(),
max_size: self.max_size,
inflight: self.inflight,
handshake_timeout: self.handshake_timeout,
disconnect_timeout: self.disconnect_timeout,
_t: PhantomData,
}
}
pub fn publish<F, Srv>(self, publish: F) -> MqttServer<Io, St, C, Cn, Srv>
where
F: IntoServiceFactory<Srv> + 'static,
Srv: ServiceFactory<Config = Session<St>, Request = Publish, Response = ()> + 'static,
C::Error: From<Srv::Error> + From<Srv::InitError> + fmt::Debug,
{
MqttServer {
connect: self.connect,
publish: publish.into_factory(),
control: self.control,
max_size: self.max_size,
inflight: self.inflight,
handshake_timeout: self.handshake_timeout,
disconnect_timeout: self.disconnect_timeout,
_t: PhantomData,
}
}
pub fn finish(
self,
) -> impl ServiceFactory<Config = (), Request = Io, Response = (), Error = MqttError<C::Error>>
{
let connect = self.connect;
let publish = self
.publish
.into_factory()
.map_err(|e| MqttError::Service(e.into()))
.map_init_err(|e| MqttError::Service(e.into()));
let control = self
.control
.map_err(|e| MqttError::Service(e.into()))
.map_init_err(|e| MqttError::Service(e.into()));
ntex::unit_config(
FactoryBuilder::new(handshake_service_factory(
connect,
self.max_size,
self.inflight,
self.handshake_timeout,
))
.disconnect_timeout(self.disconnect_timeout)
.build(factory(publish, control))
.map_err(|e| match e {
DispatcherError::Service(e) => e,
DispatcherError::Encoder(e) => MqttError::Encode(e),
DispatcherError::Decoder(e) => MqttError::Decode(e),
}),
)
}
pub(crate) fn inner_finish(
self,
) -> impl ServiceFactory<
Config = (),
Request = (Framed<Io, mqtt::Codec>, Option<Delay>),
Response = (),
Error = MqttError<C::Error>,
InitError = C::InitError,
> {
let connect = self.connect;
let publish = self
.publish
.into_factory()
.map_err(|e| MqttError::Service(e.into()))
.map_init_err(|e| MqttError::Service(e.into()));
let control = self
.control
.map_err(|e| MqttError::Service(e.into()))
.map_init_err(|e| MqttError::Service(e.into()));
ntex::unit_config(
FactoryBuilder2::new(handshake_service_factory2(
connect,
self.max_size,
self.inflight,
self.handshake_timeout,
))
.disconnect_timeout(self.disconnect_timeout)
.build(factory(publish, control))
.map_err(|e| match e {
DispatcherError::Service(e) => e,
DispatcherError::Encoder(e) => MqttError::Encode(e),
DispatcherError::Decoder(e) => MqttError::Decode(e),
}),
)
}
}
fn handshake_service_factory<Io, St, C>(
factory: C,
max_size: u32,
inflight: usize,
handshake_timeout: usize,
) -> impl ServiceFactory<
Config = (),
Request = Handshake<Io, mqtt::Codec>,
Response = HandshakeResult<Io, Session<St>, mqtt::Codec, mpsc::Receiver<mqtt::Packet>>,
Error = MqttError<C::Error>,
>
where
Io: AsyncRead + AsyncWrite + Unpin,
C: ServiceFactory<Config = (), Request = Connect<Io>, Response = ConnectAck<Io, St>>,
C::Error: fmt::Debug,
{
ntex::apply(
Timeout::new(Duration::from_millis(handshake_timeout as u64)),
ntex::fn_factory(move || {
factory.new_service(()).map_ok(move |service| {
let service = Rc::new(service.map_err(MqttError::Service));
ntex::apply_fn(service, move |conn: Handshake<Io, mqtt::Codec>, service| {
handshake(
conn.codec(mqtt::Codec::new()),
service.clone(),
max_size,
inflight,
)
})
})
}),
)
.map_err(|e| match e {
TimeoutError::Service(e) => e,
TimeoutError::Timeout => MqttError::HandshakeTimeout,
})
}
fn handshake_service_factory2<Io, St, C>(
factory: C,
max_size: u32,
inflight: usize,
handshake_timeout: usize,
) -> impl ServiceFactory<
Config = (),
Request = HandshakeResult<Io, (), mqtt::Codec, mpsc::Receiver<mqtt::Packet>>,
Response = HandshakeResult<Io, Session<St>, mqtt::Codec, mpsc::Receiver<mqtt::Packet>>,
Error = MqttError<C::Error>,
InitError = C::InitError,
>
where
Io: AsyncRead + AsyncWrite + Unpin,
C: ServiceFactory<Config = (), Request = Connect<Io>, Response = ConnectAck<Io, St>>,
C::Error: fmt::Debug,
{
ntex::apply(
Timeout::new(Duration::from_millis(handshake_timeout as u64)),
ntex::fn_factory(move || {
factory.new_service(()).map_ok(move |service| {
let service = Rc::new(service.map_err(MqttError::Service));
ntex::apply_fn(service, move |conn, service| {
handshake(conn, service.clone(), max_size, inflight)
})
})
}),
)
.map_err(|e| match e {
TimeoutError::Service(e) => e,
TimeoutError::Timeout => MqttError::HandshakeTimeout,
})
}
async fn handshake<Io, S, St, E>(
mut framed: HandshakeResult<Io, (), mqtt::Codec, mpsc::Receiver<mqtt::Packet>>,
service: S,
max_size: u32,
inflight: usize,
) -> Result<HandshakeResult<Io, Session<St>, mqtt::Codec, mpsc::Receiver<mqtt::Packet>>, S::Error>
where
Io: AsyncRead + AsyncWrite + Unpin,
S: Service<Request = Connect<Io>, Response = ConnectAck<Io, St>, Error = MqttError<E>>,
{
log::trace!("Starting mqtt handshake");
framed.get_codec_mut().set_max_size(max_size);
let packet = framed
.next()
.await
.ok_or_else(|| {
log::trace!("Server mqtt is disconnected during handshake");
MqttError::Disconnected
})
.and_then(|res| {
res.map_err(|e| {
log::trace!("Error is received during mqtt handshake: {:?}", e);
MqttError::Decode(e)
})
})?;
match packet {
mqtt::Packet::Connect(connect) => {
let (tx, rx) = mpsc::channel();
let sink = MqttSink::new(tx);
let mut ack = service
.call(Connect::new(connect, framed, sink, inflight))
.await?;
match ack.session {
Some(session) => {
log::trace!(
"Sending: {:#?}",
mqtt::Packet::ConnectAck {
session_present: ack.session_present,
return_code: mqtt::ConnectAckReason::ConnectionAccepted,
}
);
let sink = ack.sink;
ack.io
.send(mqtt::Packet::ConnectAck {
session_present: ack.session_present,
return_code: mqtt::ConnectAckReason::ConnectionAccepted,
})
.await?;
Ok(ack.io.out(rx).state(Session::new(
session,
sink,
ack.keep_alive,
ack.inflight,
)))
}
None => {
log::trace!(
"Sending: {:#?}",
mqtt::Packet::ConnectAck {
session_present: false,
return_code: ack.return_code,
}
);
ack.io
.send(mqtt::Packet::ConnectAck {
session_present: false,
return_code: ack.return_code,
})
.await?;
Err(MqttError::Disconnected)
}
}
}
packet => {
log::info!(
"MQTT-3.1.0-1: Expected CONNECT packet, received {:?}",
packet
);
Err(MqttError::Unexpected(
packet.packet_type(),
"MQTT-3.1.0-1: Expected CONNECT packet",
))
}
}
}