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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

use crate::{decoder::*, encoder::*, *};
use bytes::{Buf, BufMut, BytesMut};
#[cfg(feature = "derive")]
use serde::{Deserialize, Serialize};
use alloc::{string::String, vec::Vec};

/// Subscribe topic.
///
/// [Subscribe] packets contain a `Vec` of those.
///
/// [Subscribe]: struct.Subscribe.html
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "derive", derive(Serialize, Deserialize))]
pub struct SubscribeTopic {
    pub topic_path: String,
    pub qos: QoS,
}

/// Subscribe return value.
///
/// [Suback] packets contain a `Vec` of those.
///
/// [Suback]: struct.Subscribe.html
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum SubscribeReturnCodes {
    Success(QoS),
    Failure,
}
impl SubscribeReturnCodes {
    pub(crate) fn to_u8(&self) -> u8 {
        match *self {
            SubscribeReturnCodes::Failure => 0x80,
            SubscribeReturnCodes::Success(qos) => qos.to_u8(),
        }
    }
}

/// Subscribe packet ([MQTT 3.8]).
///
/// [MQTT 3.8]: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718063
#[derive(Debug, Clone, PartialEq)]
pub struct Subscribe {
    pub pid: Pid,
    pub topics: Vec<SubscribeTopic>,
}

/// Subsack packet ([MQTT 3.9]).
///
/// [MQTT 3.9]: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718068
#[derive(Debug, Clone, PartialEq)]
pub struct Suback {
    pub pid: Pid,
    pub return_codes: Vec<SubscribeReturnCodes>,
}

/// Unsubscribe packet ([MQTT 3.10]).
///
/// [MQTT 3.10]: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718072
#[derive(Debug, Clone, PartialEq)]
pub struct Unsubscribe {
    pub pid: Pid,
    pub topics: Vec<String>,
}

impl Subscribe {
    pub(crate) fn from_buffer(buf: &mut BytesMut) -> Result<Self, Error> {
        let pid = Pid::from_buffer(buf)?;
        let mut topics: Vec<SubscribeTopic> = Vec::new();
        while buf.remaining() != 0 {
            let topic_path = read_string(buf)?;
            let qos = QoS::from_u8(buf.get_u8())?;
            let topic = SubscribeTopic { topic_path, qos };
            topics.push(topic);
        }
        Ok(Subscribe { pid, topics })
    }

    pub(crate) fn to_buffer(&self, buf: &mut impl BufMut) -> Result<(), Error> {
        let header: u8 = 0b10000010;
        check_remaining(buf, 1)?;
        buf.put_u8(header);

        // Length: pid(2) + topic.for_each(2+len + qos(1))
        let mut length = 2;
        for topic in &self.topics {
            length += topic.topic_path.len() + 2 + 1;
        }
        write_length(length, buf)?;

        // Pid
        self.pid.to_buffer(buf)?;

        // Topics
        for topic in &self.topics {
            write_string(topic.topic_path.as_ref(), buf)?;
            buf.put_u8(topic.qos.to_u8());
        }

        Ok(())
    }
}

impl Unsubscribe {
    pub(crate) fn from_buffer(buf: &mut BytesMut) -> Result<Self, Error> {
        let pid = Pid::from_buffer(buf)?;
        let mut topics: Vec<String> = Vec::new();
        while buf.remaining() != 0 {
            let topic_path = read_string(buf)?;
            topics.push(topic_path);
        }
        Ok(Unsubscribe { pid, topics })
    }

    pub(crate) fn to_buffer(&self, buf: &mut impl BufMut) -> Result<(), Error> {
        let header: u8 = 0b10100010;
        let mut length = 2;
        for topic in &self.topics {
            length += 2 + topic.len();
        }
        check_remaining(buf, 1)?;
        buf.put_u8(header);

        write_length(length, buf)?;
        self.pid.to_buffer(buf)?;
        for topic in &self.topics {
            write_string(topic.as_ref(), buf)?;
        }
        Ok(())
    }
}

impl Suback {
    pub(crate) fn from_buffer(buf: &mut impl Buf) -> Result<Self, Error> {
        let pid = Pid::from_buffer(buf)?;
        let mut return_codes: Vec<SubscribeReturnCodes> = Vec::new();
        while buf.remaining() != 0 {
            let code = buf.get_u8();
            let r = if code == 0x80 {
                SubscribeReturnCodes::Failure
            } else {
                SubscribeReturnCodes::Success(QoS::from_u8(code)?)
            };
            return_codes.push(r);
        }
        Ok(Suback { return_codes, pid })
    }
    pub(crate) fn to_buffer(&self, buf: &mut impl BufMut) -> Result<(), Error> {
        let header: u8 = 0b10010000;
        let length = 2 + self.return_codes.len();
        check_remaining(buf, 1)?;
        buf.put_u8(header);

        write_length(length, buf)?;
        self.pid.to_buffer(buf)?;
        for rc in &self.return_codes {
            buf.put_u8(rc.to_u8());
        }
        Ok(())
    }
}