krabka_protocol/records/
error.rs

1//! Errors specific to record-batch decoding and encoding.
2
3use thiserror::Error;
4
5#[derive(Debug, Error)]
6#[non_exhaustive]
7pub enum RecordsError {
8    #[error("buffer too short for batch header (need {needed} more bytes)")]
9    HeaderTooShort { needed: usize },
10
11    #[error("batch magic byte {found} unsupported (only v2 supported)")]
12    UnsupportedMagic { found: i8 },
13
14    #[error("CRC mismatch: expected {expected:#010x}, computed {computed:#010x}")]
15    CrcMismatch { expected: u32, computed: u32 },
16
17    #[error("batch body truncated (need {needed} more bytes)")]
18    BodyTooShort { needed: usize },
19
20    #[error("record parse failed: {0}")]
21    RecordParse(String),
22
23    #[error("compression: {0}")]
24    Compression(#[from] krabka_compression::CompressionError),
25
26    #[error("zerocopy reinterpretation failed")]
27    ZerocopyFailure,
28}
29
30impl From<RecordsError> for crate::ProtocolError {
31    fn from(e: RecordsError) -> Self {
32        crate::ProtocolError::InvalidValue(match e {
33            RecordsError::HeaderTooShort { .. } => "records: header too short",
34            RecordsError::UnsupportedMagic { .. } => "records: unsupported magic",
35            RecordsError::CrcMismatch { .. } => "records: CRC mismatch",
36            RecordsError::BodyTooShort { .. } => "records: body truncated",
37            RecordsError::RecordParse(_) => "records: record parse failed",
38            RecordsError::Compression(_) => "records: compression error",
39            RecordsError::ZerocopyFailure => "records: zerocopy failure",
40        })
41    }
42}
43
44#[cfg(test)]
45mod tests {
46
47    use super::*;
48
49    #[test]
50    fn display_messages() {
51        let cases: &[(RecordsError, &str)] = &[
52            (
53                RecordsError::HeaderTooShort { needed: 4 },
54                "buffer too short for batch header",
55            ),
56            (
57                RecordsError::UnsupportedMagic { found: 1 },
58                "batch magic byte 1 unsupported",
59            ),
60            (
61                RecordsError::CrcMismatch {
62                    expected: 0xDEAD_BEEF,
63                    computed: 0x1234_5678,
64                },
65                "CRC mismatch: expected 0xdeadbeef",
66            ),
67            (
68                RecordsError::BodyTooShort { needed: 17 },
69                "batch body truncated",
70            ),
71            (
72                RecordsError::RecordParse("bad varint".into()),
73                "record parse failed",
74            ),
75            (
76                RecordsError::ZerocopyFailure,
77                "zerocopy reinterpretation failed",
78            ),
79        ];
80        for (err, contains) in cases {
81            assert2::assert!(err.to_string().contains(contains));
82        }
83    }
84
85    #[test]
86    fn into_protocol_error_is_invalid_value() {
87        let e: crate::ProtocolError = RecordsError::UnsupportedMagic { found: 0 }.into();
88        assert2::assert!(matches!(e, crate::ProtocolError::InvalidValue(_)));
89    }
90}
krabka_protocol/records/error.rs

krabka_protocol/records/
error.rs
