1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use ntex::io::IoBoxed;
use std::{fmt, num::NonZeroU16, rc::Rc};

use super::{codec, shared::MqttShared, sink::MqttSink};

/// Handshake message
pub struct Handshake {
    io: IoBoxed,
    pkt: Box<codec::Connect>,
    size: u32,
    pub(super) shared: Rc<MqttShared>,
}

impl Handshake {
    pub(crate) fn new(
        pkt: Box<codec::Connect>,
        size: u32,
        io: IoBoxed,
        shared: Rc<MqttShared>,
    ) -> Self {
        Self { io, pkt, size, shared }
    }

    #[inline]
    pub fn packet(&self) -> &codec::Connect {
        &self.pkt
    }

    #[inline]
    pub fn packet_mut(&mut self) -> &mut codec::Connect {
        &mut self.pkt
    }

    #[inline]
    pub fn packet_size(&self) -> u32 {
        self.size
    }

    #[inline]
    pub fn io(&self) -> &IoBoxed {
        &self.io
    }

    #[inline]
    /// Returns mqtt server sink
    pub fn sink(&self) -> MqttSink {
        MqttSink::new(self.shared.clone())
    }

    #[inline]
    /// Ack handshake message and set state
    pub fn ack<St>(self, st: St) -> HandshakeAck<St> {
        let max_pkt_size = self.shared.codec.max_inbound_size();
        let receive_max = self.shared.receive_max();
        let packet = codec::ConnectAck {
            reason_code: codec::ConnectAckReason::Success,
            max_qos: self.shared.max_qos(),
            topic_alias_max: self.shared.topic_alias_max(),
            receive_max: NonZeroU16::new(receive_max).unwrap_or(crate::v5::RECEIVE_MAX_DEFAULT),
            max_packet_size: if max_pkt_size == 0 { None } else { Some(max_pkt_size) },
            ..codec::ConnectAck::default()
        };

        let Handshake { io, shared, pkt, .. } = self;
        // [MQTT-3.1.2-22]
        let keepalive = if pkt.keep_alive != 0 {
            (pkt.keep_alive >> 1).checked_add(pkt.keep_alive).unwrap_or(u16::MAX)
        } else {
            30
        };
        HandshakeAck { io, shared, keepalive, packet, session: Some(st) }
    }

    #[inline]
    /// Create handshake ack object with error
    pub fn failed<St>(self, reason_code: codec::ConnectAckReason) -> HandshakeAck<St> {
        HandshakeAck {
            io: self.io,
            shared: self.shared,
            session: None,
            keepalive: 30,
            packet: codec::ConnectAck { reason_code, ..codec::ConnectAck::default() },
        }
    }

    #[inline]
    /// Create handshake ack object with provided ConnectAck packet
    pub fn fail_with<St>(self, ack: codec::ConnectAck) -> HandshakeAck<St> {
        HandshakeAck {
            io: self.io,
            shared: self.shared,
            session: None,
            packet: ack,
            keepalive: 30,
        }
    }
}

impl fmt::Debug for Handshake {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.pkt.fmt(f)
    }
}

/// Handshake ack message
pub struct HandshakeAck<St> {
    pub(crate) io: IoBoxed,
    pub(crate) session: Option<St>,
    pub(crate) shared: Rc<MqttShared>,
    pub(crate) packet: codec::ConnectAck,
    pub(crate) keepalive: u16,
}

impl<St> HandshakeAck<St> {
    #[inline]
    /// Set idle keep-alive for the connection in seconds.
    /// This method sets `server_keepalive_sec` property for `ConnectAck`
    /// response packet.
    ///
    /// By default idle keep-alive is set to 30 seconds. Panics if timeout is `0`.
    pub fn keep_alive(mut self, timeout: u16) -> Self {
        if timeout == 0 {
            panic!("Timeout must be greater than 0")
        }
        self.keepalive = timeout;
        self
    }

    /// Access to ConnectAck packet
    #[inline]
    pub fn with(mut self, f: impl FnOnce(&mut codec::ConnectAck)) -> Self {
        f(&mut self.packet);
        self
    }
}