pipecircuit 0.0.11

Correct. Robust. Fast. Portable.
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

use super::{
    StableSlot, StableSlotInsertError, StableSlotRemoveOutcome, StableSlotResolveOutcome,
    StableSlotRowRelocation, StableSlots, StableSlotsInconsistency,
};
use crate::storage::warp_table::secondary_index::SlotSet;

#[test]
fn stable_slots_follow_dense_relocation_and_reuse() -> Result<(), &'static str> {
    let mut slots = StableSlots::try_new(3).map_err(|_| "slot storage unavailable")?;
    let first = slots
        .try_prepare_insert()
        .map_err(|_| "first slot unavailable")?
        .commit();
    let second = slots
        .try_prepare_insert()
        .map_err(|_| "second slot unavailable")?
        .commit();
    let third = slots
        .try_prepare_insert()
        .map_err(|_| "third slot unavailable")?
        .commit();

    assert_eq!(
        (first, second, third),
        (StableSlot::new(0), StableSlot::new(1), StableSlot::new(2))
    );
    {
        let prepared = slots
            .try_prepare_remove(1)
            .map_err(|_| "second slot removal unavailable")?;
        assert_eq!(prepared.slot(), second);
    }
    assert_eq!(
        slots.resolve(second),
        Ok(StableSlotResolveOutcome::Resolved {
            slot: second,
            dense_row: 1,
        })
    );
    assert_eq!(slots.slot(1), Ok(second));
    assert_eq!(
        slots
            .try_prepare_remove(1)
            .map_err(|_| "second slot removal unavailable")?
            .commit(),
        StableSlotRemoveOutcome::Removed {
            slot: second,
            relocation: StableSlotRowRelocation::Relocated {
                slot: third,
                from: 2,
                to: 1,
            },
        }
    );
    assert_eq!(
        slots.resolve(third),
        Ok(StableSlotResolveOutcome::Resolved {
            slot: third,
            dense_row: 1,
        })
    );
    assert_eq!(slots.slot(1), Ok(third));
    assert_eq!(
        slots.resolve_slots(&SlotSet::one(second)).next(),
        Some(Err(StableSlotsInconsistency::SlotVacant { slot: second }))
    );

    let retained = SlotSet::one(first).union(&SlotSet::one(third));
    let mut retained = slots.resolve_slots(&retained);
    assert_eq!(retained.size_hint(), (2, Some(2)));
    #[cfg(target_pointer_width = "64")]
    assert_eq!(retained.len(), 2);
    assert_eq!(
        retained.next_back(),
        Some(Ok(StableSlotResolveOutcome::Resolved {
            slot: third,
            dense_row: 1,
        }))
    );
    assert_eq!(
        retained.next(),
        Some(Ok(StableSlotResolveOutcome::Resolved {
            slot: first,
            dense_row: 0,
        }))
    );
    assert_eq!(retained.size_hint(), (0, Some(0)));
    #[cfg(target_pointer_width = "64")]
    assert_eq!(retained.len(), 0);
    assert_eq!(retained.next(), None);
    assert_eq!(retained.next_back(), None);

    let reused = slots
        .try_prepare_insert()
        .map_err(|_| "reused slot unavailable")?
        .commit();
    assert_eq!(reused, second);
    assert_eq!(
        slots.resolve(reused),
        Ok(StableSlotResolveOutcome::Resolved {
            slot: reused,
            dense_row: 2,
        })
    );
    assert_eq!(
        slots.try_prepare_insert().map(|prepared| prepared.slot()),
        Err(StableSlotInsertError::Full { maximum_rows: 3 })
    );
    assert_eq!(
        slots.remove(2),
        Ok(StableSlotRemoveOutcome::Removed {
            slot: reused,
            relocation: StableSlotRowRelocation::Stable,
        })
    );
    assert_eq!(
        slots.resolve(reused),
        Err(StableSlotsInconsistency::SlotVacant { slot: reused })
    );
    Ok(())
}

#[test]
fn abandoned_preparation_publishes_nothing() -> Result<(), &'static str> {
    let mut slots = StableSlots::try_new(1).map_err(|_| "slot storage unavailable")?;
    let reserved = {
        let prepared = slots
            .try_prepare_insert()
            .map_err(|_| "prepared slot unavailable")?;
        prepared.slot()
    };

    let committed = slots
        .try_prepare_insert()
        .map_err(|_| "slot changed after abandonment")?
        .commit();
    assert_eq!(committed, reserved);
    assert_eq!(
        slots.resolve(committed),
        Ok(StableSlotResolveOutcome::Resolved {
            slot: committed,
            dense_row: 0,
        })
    );
    Ok(())
}