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becceb2802
* add UncompressedUint * add more UncompressedUint keys * add docs * split key/value to encode/decode and compress/uncompress traits * reveert into * clippy * rm whitespaces * remove TODO * Remove scale encode/decode traits * decompress * clippy Co-authored-by: rakita <dragan0rakita@gmail.com>
52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
//! Utils crate for `db`.
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//suse crate::kv::Error;
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use bytes::Bytes;
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use reth_interfaces::db::{Decode, Decompress, Error, Table};
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use std::borrow::Cow;
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/// Returns the default page size that can be used in this OS.
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pub(crate) fn default_page_size() -> usize {
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let os_page_size = page_size::get();
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// source: https://gitflic.ru/project/erthink/libmdbx/blob?file=mdbx.h#line-num-821
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let libmdbx_max_page_size = 0x10000;
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// May lead to errors if it's reduced further because of the potential size of the
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// data.
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let min_page_size = 4096;
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os_page_size.clamp(min_page_size, libmdbx_max_page_size)
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}
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/// Helper function to decode a `(key, value)` pair.
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pub(crate) fn decoder<'a, T>(
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kv: (Cow<'a, [u8]>, Cow<'a, [u8]>),
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) -> Result<(T::Key, T::Value), Error>
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where
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T: Table,
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T::Key: Decode,
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T::Value: Decompress,
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{
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Ok((
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Decode::decode(Bytes::from(kv.0.into_owned()))?,
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Decompress::decompress(Bytes::from(kv.1.into_owned()))?,
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))
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}
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/// Helper function to decode only a value from a `(key, value)` pair.
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pub(crate) fn decode_value<'a, T>(kv: (Cow<'a, [u8]>, Cow<'a, [u8]>)) -> Result<T::Value, Error>
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where
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T: Table,
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{
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Decompress::decompress(Bytes::from(kv.1.into_owned()))
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}
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/// Helper function to decode a value. It can be a key or subkey.
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pub(crate) fn decode_one<T>(value: Cow<'_, [u8]>) -> Result<T::Value, Error>
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where
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T: Table,
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{
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Decompress::decompress(Bytes::from(value.into_owned()))
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}
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