brk_computer 0.11.2

A Bitcoin dataset computer built on top of brk_indexer
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

mod boundary;

use brk_error::Result;
use brk_traversable::Traversable;
use brk_types::{
    BLOCKS_PER_DIFF_EPOCHS, BLOCKS_PER_HALVING, Day1, Day3, Epoch, Halving, Height, Hour1, Hour4,
    Hour12, Minute10, Minute30, Month1, Month3, Month6, Timestamp, Week1, Year1, Year10,
};
use derive_more::{Deref, DerefMut};
use vecdb::{
    AnyVec, CachedVec, Database, EagerVec, Exit, ImportableVec, LazyVec, PcoVec, ReadableBoxedVec,
    ReadableVec, Rw, StorageMode, Version,
};

use crate::internal::PerResolution;

pub use boundary::BoundaryTimestampVec;

/// Timestamps: monotonic height→timestamp + per-period timestamp lookups.
///
/// Time-based periods (minute10–year10) are lazy: `idx.to_timestamp()` is a pure
/// function of the index, so no storage or decompression is needed.
/// Block-based periods (halving, difficulty) are storage-free views of the raw
/// timestamp at each period's first block.
#[derive(Deref, DerefMut, Traversable)]
pub struct Timestamps<M: StorageMode = Rw> {
    pub monotonic: CachedVec<M::Stored<EagerVec<PcoVec<Height, Timestamp>>>>,
    #[deref]
    #[deref_mut]
    #[traversable(flatten)]
    #[allow(clippy::type_complexity)]
    pub resolutions: PerResolution<
        LazyVec<Minute10, Timestamp, Minute10, Height>,
        LazyVec<Minute30, Timestamp, Minute30, Height>,
        LazyVec<Hour1, Timestamp, Hour1, Height>,
        LazyVec<Hour4, Timestamp, Hour4, Height>,
        LazyVec<Hour12, Timestamp, Hour12, Height>,
        LazyVec<Day1, Timestamp, Day1, Height>,
        LazyVec<Day3, Timestamp, Day3, Height>,
        LazyVec<Week1, Timestamp, Week1, Height>,
        LazyVec<Month1, Timestamp, Month1, Height>,
        LazyVec<Month3, Timestamp, Month3, Height>,
        LazyVec<Month6, Timestamp, Month6, Height>,
        LazyVec<Year1, Timestamp, Year1, Height>,
        LazyVec<Year10, Timestamp, Year10, Height>,
        BoundaryTimestampVec<Halving>,
        BoundaryTimestampVec<Epoch>,
    >,
}

impl Timestamps {
    pub(crate) fn forced_import_monotonic(
        db: &Database,
        version: Version,
    ) -> Result<CachedVec<EagerVec<PcoVec<Height, Timestamp>>>> {
        Ok(CachedVec::wrap(EagerVec::forced_import(
            db,
            "timestamp_monotonic",
            version,
        )?))
    }

    #[allow(clippy::too_many_arguments)]
    pub(crate) fn from_locals(
        version: Version,
        monotonic: CachedVec<EagerVec<PcoVec<Height, Timestamp>>>,
        raw_timestamps: ReadableBoxedVec<Height, Timestamp>,
        minute10: &super::ResolutionVecs<Minute10>,
        minute30: &super::ResolutionVecs<Minute30>,
        hour1: &super::ResolutionVecs<Hour1>,
        hour4: &super::ResolutionVecs<Hour4>,
        hour12: &super::ResolutionVecs<Hour12>,
        day1: &super::DatedResolutionVecs<Day1>,
        day3: &super::DatedResolutionVecs<Day3>,
        week1: &super::DatedResolutionVecs<Week1>,
        month1: &super::DatedResolutionVecs<Month1>,
        month3: &super::DatedResolutionVecs<Month3>,
        month6: &super::DatedResolutionVecs<Month6>,
        year1: &super::DatedResolutionVecs<Year1>,
        year10: &super::DatedResolutionVecs<Year10>,
    ) -> Self {
        macro_rules! period {
            ($field:ident) => {
                LazyVec::init(
                    "timestamp",
                    version,
                    $field.first_height.read_only_boxed_clone(),
                    |idx, _: Height| idx.to_timestamp(),
                )
            };
        }

        Self {
            monotonic,
            resolutions: PerResolution {
                minute10: period!(minute10),
                minute30: period!(minute30),
                hour1: period!(hour1),
                hour4: period!(hour4),
                hour12: period!(hour12),
                day1: period!(day1),
                day3: period!(day3),
                week1: period!(week1),
                month1: period!(month1),
                month3: period!(month3),
                month6: period!(month6),
                year1: period!(year1),
                year10: period!(year10),
                halving: BoundaryTimestampVec::new(
                    raw_timestamps.clone(),
                    BLOCKS_PER_HALVING as usize,
                ),
                epoch: BoundaryTimestampVec::new(raw_timestamps, BLOCKS_PER_DIFF_EPOCHS as usize),
            },
        }
    }

    pub(crate) fn compute_monotonic(
        &mut self,
        indexer: &brk_indexer::Indexer,
        starting_height: Height,
        exit: &Exit,
    ) -> Result<bool> {
        let rewrites_existing = usize::from(starting_height) < self.monotonic.len();
        let mut prev = None;
        self.monotonic.inner.compute_transform(
            starting_height,
            &indexer.vecs.blocks.timestamp,
            |(h, timestamp, this)| {
                if prev.is_none()
                    && let Some(prev_h) = h.decremented()
                {
                    prev.replace(this.collect_one(prev_h).unwrap());
                }
                let monotonic = prev.map_or(timestamp, |p| p.max(timestamp));
                prev.replace(monotonic);
                (h, monotonic)
            },
            exit,
        )?;
        if rewrites_existing {
            self.monotonic.clear();
        }
        Ok(rewrites_existing)
    }
}