kafrust-protocol 0.2.30

Kafka wire protocol primitives for kafrust.
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

use crate::codec::{Decoder, Encoder};
use crate::error::Result;
use crate::header::RequestHeader;

pub const API_KEY: i16 = 2;
pub const EARLIEST_TIMESTAMP: i64 = -2;
pub const LATEST_TIMESTAMP: i64 = -1;

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsRequestV1 {
    pub correlation_id: i32,
    pub client_id: Option<String>,
    pub replica_id: i32,
    pub topics: Vec<ListOffsetsTopicV1>,
}

impl ListOffsetsRequestV1 {
    pub fn encode(&self) -> Result<Vec<u8>> {
        let mut encoder = Encoder::new();
        RequestHeader {
            api_key: API_KEY,
            api_version: 1,
            correlation_id: self.correlation_id,
            client_id: self.client_id.clone(),
        }
        .encode_v1(&mut encoder)?;
        encoder.write_i32(self.replica_id);
        encoder.write_array(Some(&self.topics), |encoder, topic| topic.encode(encoder))?;
        Ok(encoder.into_bytes())
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsTopicV1 {
    pub name: String,
    pub partitions: Vec<ListOffsetsPartitionV1>,
}

impl ListOffsetsTopicV1 {
    fn encode(&self, encoder: &mut Encoder) -> Result<()> {
        encoder.write_string(&self.name)?;
        encoder.write_array(Some(&self.partitions), |encoder, partition| {
            encoder.write_i32(partition.partition_index);
            encoder.write_i64(partition.timestamp);
            Ok(())
        })
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsPartitionV1 {
    pub partition_index: i32,
    pub timestamp: i64,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsResponseV1 {
    pub topics: Vec<ListOffsetsTopicResponseV1>,
}

impl ListOffsetsResponseV1 {
    pub fn decode_body(decoder: &mut Decoder<'_>) -> Result<Self> {
        Ok(Self {
            topics: decoder
                .read_array("list offsets topic responses", |decoder| {
                    Ok(ListOffsetsTopicResponseV1 {
                        name: decoder.read_string()?,
                        partitions: decoder
                            .read_array("list offsets partition responses", |decoder| {
                                Ok(ListOffsetsPartitionResponseV1 {
                                    partition_index: decoder.read_i32()?,
                                    error_code: decoder.read_i16()?,
                                    timestamp: decoder.read_i64()?,
                                    offset: decoder.read_i64()?,
                                })
                            })?
                            .unwrap_or_default(),
                    })
                })?
                .unwrap_or_default(),
        })
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsTopicResponseV1 {
    pub name: String,
    pub partitions: Vec<ListOffsetsPartitionResponseV1>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ListOffsetsPartitionResponseV1 {
    pub partition_index: i32,
    pub error_code: i16,
    pub timestamp: i64,
    pub offset: i64,
}

#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
    use super::*;

    #[test]
    fn encodes_list_offsets_v1_request() {
        let request = ListOffsetsRequestV1 {
            correlation_id: 7,
            client_id: None,
            replica_id: -1,
            topics: vec![ListOffsetsTopicV1 {
                name: "x".to_owned(),
                partitions: vec![ListOffsetsPartitionV1 {
                    partition_index: 2,
                    timestamp: LATEST_TIMESTAMP,
                }],
            }],
        };

        assert_eq!(
            request.encode().unwrap(),
            [
                0, 2, 0, 1, 0, 0, 0, 7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0, 1, 0, 1, b'x',
                0, 0, 0, 1, 0, 0, 0, 2, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            ]
        );
    }

    #[test]
    fn decodes_list_offsets_v1_response() {
        let mut encoder = Encoder::new();
        encoder.write_i32(1);
        encoder.write_string("x").unwrap();
        encoder.write_i32(1);
        encoder.write_i32(2);
        encoder.write_i16(0);
        encoder.write_i64(123);
        encoder.write_i64(42);
        let bytes = encoder.into_bytes();

        let response = ListOffsetsResponseV1::decode_body(&mut Decoder::new(&bytes)).unwrap();
        assert_eq!(response.topics[0].partitions[0].offset, 42);
    }
}