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PoS: keep 2 past epochs of data by default #1733

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merged 2 commits into from
Jul 22, 2023
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PoS: keep 2 past epochs of data by default #1733

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670f7e4
pos/epoched: keep 2 past epochs of data by default
tzemanovic Jul 18, 2023
641f9e0
changelog: add #1733
tzemanovic Jul 18, 2023
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2 changes: 2 additions & 0 deletions .changelog/unreleased/miscellaneous/1733-pos-data-history.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
- PoS: Keep the data for last two epochs by default.
([\#1733](https://github.com/anoma/namada/pull/1733))
12 changes: 9 additions & 3 deletions proof_of_stake/src/epoched.rs
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Expand Up @@ -24,11 +24,14 @@ pub const LAST_UPDATE_SUB_KEY: &str = "last_update";
/// Sub-key for an epoched data structure's oldest epoch with some data
pub const OLDEST_EPOCH_SUB_KEY: &str = "oldest_epoch";

/// Default number of past epochs to keep.
const DEFAULT_NUM_PAST_EPOCHS: u64 = 2;

/// Discrete epoched data handle
pub struct Epoched<
Data,
FutureEpochs,
const NUM_PAST_EPOCHS: u64 = 0,
const NUM_PAST_EPOCHS: u64 = DEFAULT_NUM_PAST_EPOCHS,
SON = collections::Simple,
> {
storage_prefix: storage::Key,
Expand All @@ -38,8 +41,11 @@ pub struct Epoched<
}

/// Discrete epoched data handle with nested lazy structure
pub type NestedEpoched<Data, FutureEpochs, const NUM_PAST_EPOCHS: u64 = 0> =
Epoched<Data, FutureEpochs, NUM_PAST_EPOCHS, collections::Nested>;
pub type NestedEpoched<
Data,
FutureEpochs,
const NUM_PAST_EPOCHS: u64 = DEFAULT_NUM_PAST_EPOCHS,
> = Epoched<Data, FutureEpochs, NUM_PAST_EPOCHS, collections::Nested>;

/// Delta epoched data handle
pub struct EpochedDelta<Data, FutureEpochs, const NUM_PAST_EPOCHS: u64> {
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