modelvault-core 0.16.0

Core engine for ModelVault — application-focused embedded storage with model schemas, validation, and migrations.
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

use modelvault_core::error::FormatError;
use modelvault_core::segments::header::{decode_segment_header, SegmentHeader, SegmentType};
use modelvault_core::segments::reader::scan_segments;
use modelvault_core::storage::{FileStore, Store};
use modelvault_core::DbError;

#[test]
fn segment_header_bad_magic_is_format_error() {
    let mut bytes = SegmentHeader {
        segment_type: SegmentType::Schema,
        payload_len: 1,
        payload_crc32c: 0,
    }
    .encode();
    bytes[0] ^= 0xff;
    let res = decode_segment_header(&bytes);
    assert!(matches!(
        res,
        Err(DbError::Format(FormatError::BadSegmentMagic { .. }))
    ));
}

#[test]
fn segment_header_checksum_mismatch_is_format_error() {
    let mut bytes = SegmentHeader {
        segment_type: SegmentType::Schema,
        payload_len: 1,
        payload_crc32c: 0,
    }
    .encode();
    bytes[28] ^= 0xff;
    let res = decode_segment_header(&bytes);
    assert!(matches!(
        res,
        Err(DbError::Format(FormatError::BadSegmentHeaderChecksum))
    ));
}

#[test]
fn segment_payload_checksum_mismatch_is_format_error() {
    let f = tempfile::NamedTempFile::new().unwrap();
    let file = std::fs::OpenOptions::new()
        .read(true)
        .write(true)
        .create(true)
        .truncate(false)
        .open(f.path())
        .unwrap();
    let mut store = FileStore::new(file);

    let start = 128u64;
    store.write_all_at(start - 1, &[0u8]).unwrap();

    let header = SegmentHeader {
        segment_type: SegmentType::Schema,
        payload_len: 3,
        payload_crc32c: 123, // wrong on purpose
    }
    .encode();
    store.write_all_at(start, &header).unwrap();
    store
        .write_all_at(start + header.len() as u64, b"abc")
        .unwrap();

    let res = scan_segments(&mut store, start);
    assert!(matches!(
        res,
        Err(DbError::Format(FormatError::BadSegmentPayloadChecksum))
    ));
}

#[test]
fn scan_segments_rejects_payload_past_eof() {
    let f = tempfile::NamedTempFile::new().unwrap();
    let file = std::fs::OpenOptions::new()
        .read(true)
        .write(true)
        .create(true)
        .truncate(false)
        .open(f.path())
        .unwrap();
    let mut store = FileStore::new(file);

    let start = 128u64;
    store.write_all_at(start - 1, &[0u8]).unwrap();

    let header = SegmentHeader {
        segment_type: SegmentType::Schema,
        payload_len: 9999,
        payload_crc32c: 0,
    }
    .encode();
    store.write_all_at(start, &header).unwrap();

    let res = scan_segments(&mut store, start);
    assert!(matches!(
        res,
        Err(DbError::Format(FormatError::SegmentPayloadPastEof))
    ));
}

#[test]
fn scan_segments_rejects_trailing_truncated_header() {
    let f = tempfile::NamedTempFile::new().unwrap();
    let file = std::fs::OpenOptions::new()
        .read(true)
        .write(true)
        .create(true)
        .truncate(false)
        .open(f.path())
        .unwrap();
    let mut store = FileStore::new(file);

    let start = 128u64;
    store.write_all_at(start - 1, &[0u8]).unwrap();
    store.write_all_at(start, &[0u8; 7]).unwrap();

    let res = scan_segments(&mut store, start);
    assert!(matches!(
        res,
        Err(DbError::Format(FormatError::TruncatedSegmentHeader { .. }))
    ));
}