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use std::{fmt, num::NonZeroU16, rc::Rc};
use super::{codec, shared::MqttShared, sink::MqttSink};
pub struct Handshake<Io> {
io: Io,
pkt: codec::Connect,
shared: Rc<MqttShared>,
max_size: u32,
max_receive: u16,
max_topic_alias: u16,
}
impl<Io> Handshake<Io> {
pub(crate) fn new(
pkt: codec::Connect,
io: Io,
shared: Rc<MqttShared>,
max_size: u32,
max_receive: u16,
max_topic_alias: u16,
) -> Self {
Self { pkt, io, shared, max_size, max_receive, max_topic_alias }
}
pub fn packet(&self) -> &codec::Connect {
&self.pkt
}
pub fn packet_mut(&mut self) -> &mut codec::Connect {
&mut self.pkt
}
#[inline]
pub fn io(&mut self) -> &mut Io {
&mut self.io
}
pub fn sink(&self) -> MqttSink {
MqttSink::new(self.shared.clone())
}
pub fn ack<St>(self, st: St) -> HandshakeAck<Io, St> {
let mut packet = codec::ConnectAck {
reason_code: codec::ConnectAckReason::Success,
topic_alias_max: self.max_topic_alias,
..codec::ConnectAck::default()
};
if self.max_size != 0 {
packet.max_packet_size = Some(self.max_size);
}
if self.max_receive != 0 {
packet.receive_max = Some(NonZeroU16::new(self.max_receive).unwrap());
}
HandshakeAck {
io: self.io,
shared: self.shared,
session: Some(st),
lw: 256,
read_hw: 4 * 1024,
write_hw: 4 * 1024,
keepalive: 30,
packet,
}
}
pub fn failed<St>(self, reason_code: codec::ConnectAckReason) -> HandshakeAck<Io, St> {
HandshakeAck {
io: self.io,
shared: self.shared,
session: None,
keepalive: 30,
lw: 256,
read_hw: 4 * 1024,
write_hw: 4 * 1024,
packet: codec::ConnectAck { reason_code, ..codec::ConnectAck::default() },
}
}
pub fn fail_with<St>(self, ack: codec::ConnectAck) -> HandshakeAck<Io, St> {
HandshakeAck {
io: self.io,
shared: self.shared,
session: None,
packet: ack,
lw: 256,
read_hw: 4 * 1024,
write_hw: 4 * 1024,
keepalive: 30,
}
}
}
impl<T> fmt::Debug for Handshake<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.pkt.fmt(f)
}
}
pub struct HandshakeAck<Io, St> {
pub(crate) io: Io,
pub(crate) session: Option<St>,
pub(crate) shared: Rc<MqttShared>,
pub(crate) packet: codec::ConnectAck,
pub(crate) keepalive: u16,
pub(crate) lw: u16,
pub(crate) read_hw: u16,
pub(crate) write_hw: u16,
}
impl<Io, St> HandshakeAck<Io, St> {
pub fn keep_alive(mut self, timeout: u16) -> Self {
if timeout == 0 {
panic!("Timeout must be greater than 0")
}
self.keepalive = timeout;
self
}
#[inline]
pub fn buffer_params(
mut self,
max_read_buf: u16,
max_write_buf: u16,
min_buf_size: u16,
) -> Self {
self.read_hw = max_read_buf;
self.write_hw = max_write_buf;
self.lw = min_buf_size;
self
}
#[doc(hidden)]
#[deprecated(since = "0.6.3")]
pub fn low_watermark(mut self, lw: u16) -> Self {
self.lw = lw;
self
}
#[doc(hidden)]
#[deprecated(since = "0.6.3")]
pub fn read_high_watermark(mut self, hw: u16) -> Self {
self.read_hw = hw;
self
}
#[doc(hidden)]
#[deprecated(since = "0.6.3")]
pub fn write_high_watermark(mut self, hw: u16) -> Self {
self.write_hw = hw;
self
}
#[inline]
pub fn with(mut self, f: impl FnOnce(&mut codec::ConnectAck)) -> Self {
f(&mut self.packet);
self
}
}