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use std::marker::PhantomData;
use std::num::NonZeroU16;
use bytestring::ByteString;
use super::codec;
use crate::types::QoS;
pub enum ControlPacket {
Ping(Ping),
Disconnect(Disconnect),
Subscribe(Subscribe),
Unsubscribe(Unsubscribe),
Closed(Closed),
}
pub struct ControlResult {
pub(crate) result: ControlResultKind,
}
pub(crate) enum ControlResultKind {
Ping,
Disconnect,
Subscribe(SubscribeResult),
Unsubscribe(UnsubscribeResult),
Closed,
}
impl ControlPacket {
pub(crate) fn ping() -> Self {
ControlPacket::Ping(Ping)
}
pub(crate) fn disconnect() -> Self {
ControlPacket::Disconnect(Disconnect)
}
pub(crate) fn closed(is_error: bool) -> Self {
ControlPacket::Closed(Closed::new(is_error))
}
}
pub struct Ping;
impl Ping {
pub fn ack(self) -> ControlResult {
ControlResult { result: ControlResultKind::Ping }
}
}
pub struct Disconnect;
impl Disconnect {
pub fn ack(self) -> ControlResult {
ControlResult { result: ControlResultKind::Disconnect }
}
}
pub struct Subscribe {
packet_id: NonZeroU16,
topics: Vec<(ByteString, QoS)>,
codes: Vec<codec::SubscribeReturnCode>,
}
pub(crate) struct SubscribeResult {
pub(crate) codes: Vec<codec::SubscribeReturnCode>,
pub(crate) packet_id: NonZeroU16,
}
impl Subscribe {
pub(crate) fn new(packet_id: NonZeroU16, topics: Vec<(ByteString, QoS)>) -> Self {
let mut codes = Vec::with_capacity(topics.len());
(0..topics.len()).for_each(|_| codes.push(codec::SubscribeReturnCode::Failure));
Self { topics, codes, packet_id }
}
#[inline]
pub fn iter_mut(&mut self) -> SubscribeIter {
SubscribeIter { subs: self as *const _ as *mut _, entry: 0, lt: PhantomData }
}
#[inline]
pub fn ack(self) -> ControlResult {
ControlResult {
result: ControlResultKind::Subscribe(SubscribeResult {
codes: self.codes,
packet_id: self.packet_id,
}),
}
}
}
impl<'a> IntoIterator for &'a mut Subscribe {
type Item = Subscription<'a>;
type IntoIter = SubscribeIter<'a>;
fn into_iter(self) -> SubscribeIter<'a> {
self.iter_mut()
}
}
pub struct SubscribeIter<'a> {
subs: *mut Subscribe,
entry: usize,
lt: PhantomData<&'a mut Subscribe>,
}
impl<'a> SubscribeIter<'a> {
fn next_unsafe(&mut self) -> Option<Subscription<'a>> {
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,
code: &mut subs.codes[self.entry],
};
self.entry += 1;
Some(s)
} else {
None
}
}
}
impl<'a> Iterator for SubscribeIter<'a> {
type Item = Subscription<'a>;
#[inline]
fn next(&mut self) -> Option<Subscription<'a>> {
self.next_unsafe()
}
}
pub struct Subscription<'a> {
topic: &'a ByteString,
qos: QoS,
code: &'a mut codec::SubscribeReturnCode,
}
impl<'a> Subscription<'a> {
#[inline]
pub fn topic(&self) -> &'a ByteString {
&self.topic
}
#[inline]
pub fn qos(&self) -> QoS {
self.qos
}
#[inline]
pub fn fail(&mut self) {
*self.code = codec::SubscribeReturnCode::Failure
}
#[inline]
pub fn subscribe(&mut self, qos: QoS) {
*self.code = codec::SubscribeReturnCode::Success(qos)
}
}
pub struct Unsubscribe {
packet_id: NonZeroU16,
topics: Vec<ByteString>,
}
pub(crate) struct UnsubscribeResult {
pub(crate) packet_id: NonZeroU16,
}
impl Unsubscribe {
pub(crate) fn new(packet_id: NonZeroU16, topics: Vec<ByteString>) -> Self {
Self { topics, packet_id }
}
pub fn iter(&self) -> impl Iterator<Item = &ByteString> {
self.topics.iter()
}
#[inline]
pub fn ack(self) -> ControlResult {
ControlResult {
result: ControlResultKind::Unsubscribe(UnsubscribeResult {
packet_id: self.packet_id,
}),
}
}
}
pub struct Closed {
is_error: bool,
}
impl Closed {
pub(crate) fn new(is_error: bool) -> Self {
Self { is_error }
}
pub fn is_error(&self) -> bool {
self.is_error
}
#[inline]
pub fn ack(self) -> ControlResult {
ControlResult { result: ControlResultKind::Closed }
}
}