48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
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use crate::{Error, HotStateSummary, Store};
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use types::{BeaconState, EthSpec, Hash256};
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/// A collection of states to be stored in the database.
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///
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/// Consumes minimal space in memory by not storing states between epoch boundaries.
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#[derive(Debug, Clone, Default)]
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pub struct StateBatch<E: EthSpec> {
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items: Vec<BatchItem<E>>,
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}
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#[derive(Debug, Clone)]
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#[allow(clippy::large_enum_variant)]
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enum BatchItem<E: EthSpec> {
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Full(Hash256, BeaconState<E>),
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Summary(Hash256, HotStateSummary),
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}
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impl<E: EthSpec> StateBatch<E> {
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/// Create a new empty batch.
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pub fn new() -> Self {
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Self::default()
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}
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/// Stage a `BeaconState` to be stored.
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pub fn add_state(&mut self, state_root: Hash256, state: &BeaconState<E>) -> Result<(), Error> {
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let item = if state.slot % E::slots_per_epoch() == 0 {
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BatchItem::Full(state_root, state.clone())
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} else {
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BatchItem::Summary(state_root, HotStateSummary::new(&state_root, state)?)
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};
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self.items.push(item);
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Ok(())
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}
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/// Write the batch to the database.
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///
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/// May fail to write the full batch if any of the items error (i.e. not atomic!)
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pub fn commit<S: Store<E>>(self, store: &S) -> Result<(), Error> {
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self.items.into_iter().try_for_each(|item| match item {
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BatchItem::Full(state_root, state) => store.put_state(&state_root, state),
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BatchItem::Summary(state_root, summary) => {
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store.put_state_summary(&state_root, summary)
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}
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})
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}
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}
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