mirror of
https://github.com/hl-archive-node/nanoreth.git
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109 lines
3.2 KiB
Rust
109 lines
3.2 KiB
Rust
use super::mask::{ColumnSelectorOne, ColumnSelectorThree, ColumnSelectorTwo};
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use crate::table::Decompress;
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use derive_more::{Deref, DerefMut};
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use reth_interfaces::provider::ProviderResult;
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use reth_nippy_jar::{MmapHandle, NippyJar, NippyJarCursor};
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use reth_primitives::{snapshot::SegmentHeader, B256};
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/// Cursor of a snapshot segment.
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#[derive(Debug, Deref, DerefMut)]
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pub struct SnapshotCursor<'a>(NippyJarCursor<'a, SegmentHeader>);
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impl<'a> SnapshotCursor<'a> {
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/// Returns a new [`SnapshotCursor`].
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pub fn new(jar: &'a NippyJar<SegmentHeader>, mmap_handle: MmapHandle) -> ProviderResult<Self> {
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Ok(Self(NippyJarCursor::with_handle(jar, mmap_handle)?))
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}
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/// Returns the current `BlockNumber` or `TxNumber` of the cursor depending on the kind of
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/// snapshot segment.
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pub fn number(&self) -> u64 {
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self.row_index() + self.jar().user_header().start()
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}
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/// Gets a row of values.
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pub fn get(
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&mut self,
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key_or_num: KeyOrNumber<'_>,
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mask: usize,
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) -> ProviderResult<Option<Vec<&'_ [u8]>>> {
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let row = match key_or_num {
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KeyOrNumber::Key(k) => self.row_by_key_with_cols(k, mask),
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KeyOrNumber::Number(n) => {
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let offset = self.jar().user_header().start();
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if offset > n {
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return Ok(None)
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}
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self.row_by_number_with_cols((n - offset) as usize, mask)
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}
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}?;
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Ok(row)
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}
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/// Gets one column value from a row.
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pub fn get_one<M: ColumnSelectorOne>(
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&mut self,
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key_or_num: KeyOrNumber<'_>,
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) -> ProviderResult<Option<M::FIRST>> {
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let row = self.get(key_or_num, M::MASK)?;
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match row {
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Some(row) => Ok(Some(M::FIRST::decompress(row[0])?)),
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None => Ok(None),
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}
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}
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/// Gets two column values from a row.
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pub fn get_two<M: ColumnSelectorTwo>(
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&mut self,
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key_or_num: KeyOrNumber<'_>,
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) -> ProviderResult<Option<(M::FIRST, M::SECOND)>> {
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let row = self.get(key_or_num, M::MASK)?;
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match row {
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Some(row) => Ok(Some((M::FIRST::decompress(row[0])?, M::SECOND::decompress(row[1])?))),
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None => Ok(None),
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}
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}
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/// Gets three column values from a row.
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#[allow(clippy::type_complexity)]
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pub fn get_three<M: ColumnSelectorThree>(
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&mut self,
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key_or_num: KeyOrNumber<'_>,
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) -> ProviderResult<Option<(M::FIRST, M::SECOND, M::THIRD)>> {
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let row = self.get(key_or_num, M::MASK)?;
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match row {
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Some(row) => Ok(Some((
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M::FIRST::decompress(row[0])?,
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M::SECOND::decompress(row[1])?,
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M::THIRD::decompress(row[2])?,
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))),
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None => Ok(None),
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}
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}
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}
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/// Either a key _or_ a block/tx number
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#[derive(Debug)]
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pub enum KeyOrNumber<'a> {
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/// A slice used as a key. Usually a block/tx hash
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Key(&'a [u8]),
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/// A block/tx number
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Number(u64),
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}
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impl<'a> From<&'a B256> for KeyOrNumber<'a> {
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fn from(value: &'a B256) -> Self {
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KeyOrNumber::Key(value.as_slice())
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}
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}
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impl<'a> From<u64> for KeyOrNumber<'a> {
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fn from(value: u64) -> Self {
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KeyOrNumber::Number(value)
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}
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}
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