mqrstt 0.4.2

Pure rust MQTTv5 client implementation Smol and Tokio
Documentation 
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

mod properties;
pub use properties::UnsubAckProperties;

mod reason_code;
pub use reason_code::UnsubAckReasonCode;

use crate::packets::mqtt_trait::MqttAsyncRead;

use bytes::BufMut;

use tokio::io::AsyncReadExt;

use super::error::SerializeError;
use super::mqtt_trait::{MqttRead, MqttWrite, PacketRead, PacketWrite};
use super::{PacketAsyncRead, VariableInteger, WireLength};

/// UnsubAck packet is sent by the server in response to an [`crate::packets::Unsubscribe`] packet.
#[derive(Debug, Default, PartialEq, Eq, Clone)]
pub struct UnsubAck {
    pub packet_identifier: u16,
    pub properties: UnsubAckProperties,
    pub reason_codes: Vec<UnsubAckReasonCode>,
}

impl PacketRead for UnsubAck {
    fn read(_: u8, remaining_length: usize, mut buf: bytes::Bytes) -> Result<Self, super::error::DeserializeError> {
        let packet_identifier = u16::read(&mut buf)?;
        let properties = UnsubAckProperties::read(&mut buf)?;
        let mut reason_codes = vec![];

        let mut read = 2 + properties.wire_len().variable_integer_len() + properties.wire_len();
        loop {
            if read == remaining_length {
                break;
            }

            let reason_code = UnsubAckReasonCode::read(&mut buf)?;
            reason_codes.push(reason_code);
            read += 1;
        }

        Ok(Self {
            packet_identifier,
            properties,
            reason_codes,
        })
    }
}

impl<S> PacketAsyncRead<S> for UnsubAck
where
    S: tokio::io::AsyncRead + Unpin,
{
    async fn async_read(_: u8, remaining_length: usize, stream: &mut S) -> Result<(Self, usize), crate::packets::error::ReadError> {
        let mut total_read_bytes = 2;
        let packet_identifier = stream.read_u16().await?;

        let (properties, properties_read_bytes) = UnsubAckProperties::async_read(stream).await?;
        total_read_bytes += properties_read_bytes;

        let mut reason_codes = vec![];
        loop {
            if total_read_bytes >= remaining_length {
                break;
            }

            let (reason_code, reason_code_read_bytes) = UnsubAckReasonCode::async_read(stream).await?;
            total_read_bytes += reason_code_read_bytes;

            reason_codes.push(reason_code);
        }

        Ok((
            Self {
                packet_identifier,
                properties,
                reason_codes,
            },
            total_read_bytes,
        ))
    }
}

impl PacketWrite for UnsubAck {
    fn write(&self, buf: &mut bytes::BytesMut) -> Result<(), SerializeError> {
        buf.put_u16(self.packet_identifier);
        self.properties.write(buf)?;
        for reason_code in &self.reason_codes {
            reason_code.write(buf)?;
        }
        Ok(())
    }
}

impl<S> crate::packets::mqtt_trait::PacketAsyncWrite<S> for UnsubAck
where
    S: tokio::io::AsyncWrite + Unpin,
{
    fn async_write(&self, stream: &mut S) -> impl std::future::Future<Output = Result<usize, crate::packets::error::WriteError>> {
        use crate::packets::mqtt_trait::MqttAsyncWrite;
        use tokio::io::AsyncWriteExt;
        async move {
            let mut total_written_bytes = 2;
            stream.write_u16(self.packet_identifier).await?;

            total_written_bytes += self.properties.async_write(stream).await?;

            for reason_code in &self.reason_codes {
                reason_code.async_write(stream).await?;
            }
            total_written_bytes += self.reason_codes.len();

            Ok(total_written_bytes)
        }
    }
}

impl WireLength for UnsubAck {
    fn wire_len(&self) -> usize {
        2 + self.properties.wire_len().variable_integer_len() + self.properties.wire_len() + self.reason_codes.len()
    }
}

#[cfg(test)]
mod tests {
    use bytes::{Bytes, BytesMut};

    use crate::packets::{
        mqtt_trait::{PacketRead, PacketWrite},
        unsuback::UnsubAck,
    };

    #[test]
    fn read_write_unsub_ack() {
        // let entire_mqtt_packet = [0xb0, 0x04, 0x35, 0xd7, 0x00, 0x00];
        let unsub_ack = [0x35, 0xd7, 0x00, 0x00];

        let mut bufmut = BytesMut::new();
        bufmut.extend(&unsub_ack[..]);

        let buf: Bytes = bufmut.into();

        let s = UnsubAck::read(0xb0, 4, buf.clone()).unwrap();

        let mut result = BytesMut::new();
        s.write(&mut result).unwrap();

        assert_eq!(buf.to_vec(), result.to_vec());
    }
}