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use std::cell::{Ref, RefMut};
use std::marker::PhantomData;
use actix_ioframe::State;
use bytes::Bytes;
use mqtt_codec as mqtt;
use string::String;
use crate::dispatcher::MqttState;
use crate::sink::MqttSink;
pub struct Subscribe<S> {
topics: Vec<(String<Bytes>, mqtt::QoS)>,
codes: Vec<mqtt::SubscribeReturnCode>,
state: State<MqttState<S>>,
}
pub struct SubscribeResult {
pub(crate) codes: Vec<mqtt::SubscribeReturnCode>,
}
impl<S> Subscribe<S> {
pub(crate) fn new(
state: State<MqttState<S>>,
topics: Vec<(String<Bytes>, mqtt::QoS)>,
) -> Self {
let mut codes = Vec::with_capacity(topics.len());
(0..topics.len()).for_each(|_| codes.push(mqtt::SubscribeReturnCode::Failure));
Self {
topics,
state,
codes,
}
}
#[inline]
pub fn session(&self) -> Ref<S> {
Ref::map(self.state.get_ref(), |t| &t.st)
}
#[inline]
pub fn session_mut(&mut self) -> RefMut<S> {
RefMut::map(self.state.get_mut(), |t| &mut t.st)
}
#[inline]
pub fn sink(&self) -> MqttSink {
self.state.get_ref().sink().clone()
}
#[inline]
pub fn iter_mut(&mut self) -> SubscribeIter<S> {
SubscribeIter {
subs: self as *const _ as *mut _,
entry: 0,
lt: PhantomData,
}
}
#[inline]
pub fn into_result(self) -> SubscribeResult {
SubscribeResult { codes: self.codes }
}
}
impl<'a, S> IntoIterator for &'a mut Subscribe<S> {
type Item = Subscription<'a, S>;
type IntoIter = SubscribeIter<'a, S>;
fn into_iter(self) -> SubscribeIter<'a, S> {
self.iter_mut()
}
}
pub struct SubscribeIter<'a, S> {
subs: *mut Subscribe<S>,
entry: usize,
lt: PhantomData<&'a mut Subscribe<S>>,
}
impl<'a, S> SubscribeIter<'a, S> {
fn next_unsafe(&mut self) -> Option<Subscription<'a, S>> {
let subs = unsafe { &mut *self.subs };
if self.entry < subs.topics.len() {
let s = Subscription {
topic: &subs.topics[self.entry].0,
qos: subs.topics[self.entry].1,
state: subs.state.clone(),
code: &mut subs.codes[self.entry],
};
self.entry += 1;
Some(s)
} else {
None
}
}
}
impl<'a, S> Iterator for SubscribeIter<'a, S> {
type Item = Subscription<'a, S>;
#[inline]
fn next(&mut self) -> Option<Subscription<'a, S>> {
self.next_unsafe()
}
}
pub struct Subscription<'a, S> {
topic: &'a String<Bytes>,
state: State<MqttState<S>>,
qos: mqtt::QoS,
code: &'a mut mqtt::SubscribeReturnCode,
}
impl<'a, S> Subscription<'a, S> {
#[inline]
pub fn session(&self) -> Ref<S> {
Ref::map(self.state.get_ref(), |t| &t.st)
}
#[inline]
pub fn session_mut(&mut self) -> RefMut<S> {
RefMut::map(self.state.get_mut(), |t| &mut t.st)
}
#[inline]
pub fn topic(&self) -> &'a String<Bytes> {
&self.topic
}
#[inline]
pub fn qos(&self) -> mqtt::QoS {
self.qos
}
#[inline]
pub fn fail(&mut self) {
*self.code = mqtt::SubscribeReturnCode::Failure
}
#[inline]
pub fn subscribe(&mut self, qos: mqtt::QoS) {
*self.code = mqtt::SubscribeReturnCode::Success(qos)
}
}
pub struct Unsubscribe<S> {
state: State<MqttState<S>>,
topics: Vec<String<Bytes>>,
}
impl<S> Unsubscribe<S> {
pub(crate) fn new(state: State<MqttState<S>>, topics: Vec<String<Bytes>>) -> Self {
Self { topics, state }
}
#[inline]
pub fn session(&self) -> Ref<S> {
Ref::map(self.state.get_ref(), |t| &t.st)
}
#[inline]
pub fn session_mut(&mut self) -> RefMut<S> {
RefMut::map(self.state.get_mut(), |t| &mut t.st)
}
#[inline]
pub fn sink(&self) -> MqttSink {
self.state.get_ref().sink().clone()
}
pub fn iter(&self) -> impl Iterator<Item = &String<Bytes>> {
self.topics.iter()
}
}