mirror of
https://github.com/zaphar/merkle-dag.git
synced 2025-07-22 10:39:48 -04:00
101 lines
2.9 KiB
Rust
101 lines
2.9 KiB
Rust
// Copyright 2022 Jeremy Wall (Jeremy@marzhilsltudios.com)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Module implementing a rocksdb store interfaces for a MerkleDag.
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//! Requires the `rocksdb` feature to be enabled.
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use std::path::Path;
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use crate::{
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hash::HashWriter,
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node::Node,
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store::{Result as StoreResult, Store, StoreError},
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};
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use ciborium;
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use rocksdb::{DBWithThreadMode, MultiThreaded, Options, SingleThreaded, ThreadMode};
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pub type Result<T> = std::result::Result<T, rocksdb::Error>;
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pub struct RocksStore<TM>
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where
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TM: ThreadMode,
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{
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store: DBWithThreadMode<TM>,
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}
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/// Type alias for a `RocksStore<SingleThreaded>`.
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pub type SingleThreadedRocksStore = RocksStore<SingleThreaded>;
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/// Type alias for a `RocksStore<Multithreaded>`.
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pub type MultiThreadedRocksStore = RocksStore<MultiThreaded>;
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/// A Rocksdb `Store` implementation generic over the single and multithreaded
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/// versions.
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impl<TM> RocksStore<TM>
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where
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TM: ThreadMode,
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{
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pub fn open<P: AsRef<Path>>(path: P) -> Result<Self> {
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let opts = Options::default();
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Self::open_with_opts(path, &opts)
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}
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pub fn open_with_opts<P: AsRef<Path>>(path: P, opts: &Options) -> Result<Self> {
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Ok(Self {
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store: DBWithThreadMode::<TM>::open(&opts, path)?,
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})
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}
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}
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impl<TM, HW> Store<HW> for RocksStore<TM>
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where
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TM: ThreadMode,
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HW: HashWriter,
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{
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fn contains(&self, id: &[u8]) -> StoreResult<bool> {
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Ok(self
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.store
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.get(id)
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.map_err(|e| StoreError::StoreFailure(format!("{:?}", e)))?
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.is_some())
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}
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fn get(&self, id: &[u8]) -> StoreResult<Option<Node<HW>>> {
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Ok(
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match self
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.store
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.get(id)
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.map_err(|e| StoreError::StoreFailure(format!("{:?}", e)))?
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{
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Some(bs) => ciborium::de::from_reader(bs.as_slice()).map_err(|e| {
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StoreError::StoreFailure(format!("Invalid serialization {:?}", e))
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})?,
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None => None,
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},
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)
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}
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fn store(&mut self, node: Node<HW>) -> StoreResult<()> {
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let mut buf = Vec::new();
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ciborium::ser::into_writer(&node, &mut buf).unwrap();
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self.store.put(node.id(), &buf)?;
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Ok(())
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}
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}
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impl From<rocksdb::Error> for StoreError {
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fn from(err: rocksdb::Error) -> Self {
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StoreError::StoreFailure(format!("{}", err))
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}
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}
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