accelerator 0.1.1

MVP multi-level cache runtime with singleflight load de-duplication
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

use accelerator::CacheError;

use crate::support::{CacheEvictBatchHarness, MacroTestError, User};

#[tokio::test]
async fn cache_evict_batch_after_success_deletes_cache() {
    let harness = CacheEvictBatchHarness::new();
    harness.cache.seed(
        1,
        Some(User {
            id: 1,
            name: "x".to_string(),
        }),
    );
    harness.cache.seed(
        2,
        Some(User {
            id: 2,
            name: "y".to_string(),
        }),
    );

    harness.evict_after_ok(vec![1, 2]).await.unwrap();

    assert_eq!(harness.runs_after_ok(), 1);
    assert_eq!(harness.cache.mdel_calls(), 1);
    assert_eq!(harness.cache.read(1), None);
    assert_eq!(harness.cache.read(2), None);
}

#[tokio::test]
async fn cache_evict_batch_after_fail_keeps_cache() {
    let harness = CacheEvictBatchHarness::new();
    harness.cache.seed(
        3,
        Some(User {
            id: 3,
            name: "keep".to_string(),
        }),
    );

    let err = harness.evict_after_fail(vec![3]).await.unwrap_err();

    assert!(matches!(err, MacroTestError::Biz("after-fail")));
    assert_eq!(harness.runs_after_fail(), 1);
    assert_eq!(harness.cache.mdel_calls(), 0);
    assert_eq!(
        harness.cache.read(3),
        Some(User {
            id: 3,
            name: "keep".to_string()
        })
    );
}

#[tokio::test]
async fn cache_evict_batch_before_fail_still_deletes() {
    let harness = CacheEvictBatchHarness::new();
    harness.cache.seed(
        4,
        Some(User {
            id: 4,
            name: "drop".to_string(),
        }),
    );

    let err = harness.evict_before_fail(vec![4]).await.unwrap_err();

    assert!(matches!(err, MacroTestError::Biz("before-fail")));
    assert_eq!(harness.runs_before_fail(), 1);
    assert_eq!(harness.cache.mdel_calls(), 1);
    assert_eq!(harness.cache.read(4), None);
}

#[tokio::test]
async fn cache_evict_batch_ignore_mdel_error_keeps_business_success() {
    let harness = CacheEvictBatchHarness::new();
    harness.cache.set_fail_mdel(true);

    harness.evict_after_ok(vec![8, 9]).await.unwrap();

    assert_eq!(harness.runs_after_ok(), 1);
    assert_eq!(harness.cache.mdel_calls(), 1);
}

#[tokio::test]
async fn cache_evict_batch_propagate_mdel_error_returns_cache_error() {
    let harness = CacheEvictBatchHarness::new();
    harness.cache.set_fail_mdel(true);

    let err = harness.evict_propagate(vec![10, 11]).await.unwrap_err();

    assert!(matches!(
        err,
        MacroTestError::Cache(CacheError::Backend(ref msg)) if msg.contains("mock mdel failed")
    ));
    assert_eq!(harness.runs_propagate(), 1);
    assert_eq!(harness.cache.mdel_calls(), 1);
}

#[tokio::test]
async fn cache_evict_batch_deduplicates_keys_before_mdel() {
    let harness = CacheEvictBatchHarness::new();

    harness.evict_after_ok(vec![5, 5, 5, 6]).await.unwrap();

    let calls = harness.cache.last_mdel_keys();
    assert_eq!(calls.len(), 1);
    assert_eq!(calls[0], vec![5, 6]);
}

#[tokio::test]
async fn cache_evict_batch_empty_keys_skips_mdel_but_runs_business() {
    let harness = CacheEvictBatchHarness::new();

    harness.evict_after_ok(Vec::new()).await.unwrap();

    assert_eq!(harness.runs_after_ok(), 1);
    assert_eq!(harness.cache.mdel_calls(), 0);
}

#[tokio::test]
async fn cache_evict_batch_accepts_slice_keys() {
    let harness = CacheEvictBatchHarness::new();

    harness
        .evict_after_ok_with_slice(&[12, 12, 13])
        .await
        .unwrap();

    let calls = harness.cache.last_mdel_keys();
    assert_eq!(calls.len(), 1);
    assert_eq!(calls[0], vec![12, 13]);
}