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132 lines
3.6 KiB
132 lines
3.6 KiB
// Copyright 2018 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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use std::marker::PhantomData;
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use crate::{
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backend::{BackendDatabase, BackendFlags, BackendIter, BackendRoCursor, BackendRwTransaction},
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error::StoreError,
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helpers::read_transform,
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readwrite::{Readable, Writer},
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value::Value,
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};
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type EmptyResult = Result<(), StoreError>;
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#[derive(Debug, Eq, PartialEq, Copy, Clone)]
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pub struct SingleStore<D> {
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db: D,
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}
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pub struct Iter<'i, I> {
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iter: I,
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phantom: PhantomData<&'i ()>,
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}
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impl<D> SingleStore<D>
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where
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D: BackendDatabase,
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{
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pub(crate) fn new(db: D) -> SingleStore<D> {
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SingleStore { db }
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}
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pub fn get<'r, R, K>(&self, reader: &'r R, k: K) -> Result<Option<Value<'r>>, StoreError>
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where
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R: Readable<'r, Database = D>,
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K: AsRef<[u8]>,
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{
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reader.get(&self.db, &k)
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}
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// TODO: flags
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pub fn put<T, K>(&self, writer: &mut Writer<T>, k: K, v: &Value) -> EmptyResult
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where
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T: BackendRwTransaction<Database = D>,
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K: AsRef<[u8]>,
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{
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writer.put(&self.db, &k, v, T::Flags::empty())
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}
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#[cfg(not(feature = "db-dup-sort"))]
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pub fn delete<T, K>(&self, writer: &mut Writer<T>, k: K) -> EmptyResult
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where
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T: BackendRwTransaction<Database = D>,
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K: AsRef<[u8]>,
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{
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writer.delete(&self.db, &k)
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}
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#[cfg(feature = "db-dup-sort")]
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pub fn delete<T, K>(&self, writer: &mut Writer<T>, k: K) -> EmptyResult
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where
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T: BackendRwTransaction<Database = D>,
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K: AsRef<[u8]>,
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{
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writer.delete(&self.db, &k, None)
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}
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pub fn iter_start<'r, R, I, C>(&self, reader: &'r R) -> Result<Iter<'r, I>, StoreError>
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where
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R: Readable<'r, Database = D, RoCursor = C>,
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I: BackendIter<'r>,
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C: BackendRoCursor<'r, Iter = I>,
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{
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let cursor = reader.open_ro_cursor(&self.db)?;
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let iter = cursor.into_iter();
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Ok(Iter {
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iter,
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phantom: PhantomData,
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})
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}
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pub fn iter_from<'r, R, I, C, K>(&self, reader: &'r R, k: K) -> Result<Iter<'r, I>, StoreError>
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where
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R: Readable<'r, Database = D, RoCursor = C>,
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I: BackendIter<'r>,
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C: BackendRoCursor<'r, Iter = I>,
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K: AsRef<[u8]> + 'r,
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{
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let cursor = reader.open_ro_cursor(&self.db)?;
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let iter = cursor.into_iter_from(k);
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Ok(Iter {
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iter,
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phantom: PhantomData,
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})
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}
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pub fn clear<T>(&self, writer: &mut Writer<T>) -> EmptyResult
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where
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D: BackendDatabase,
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T: BackendRwTransaction<Database = D>,
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{
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writer.clear(&self.db)
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}
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}
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impl<'i, I> Iterator for Iter<'i, I>
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where
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I: BackendIter<'i>,
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{
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type Item = Result<(&'i [u8], Value<'i>), StoreError>;
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fn next(&mut self) -> Option<Self::Item> {
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match self.iter.next() {
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None => None,
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Some(Ok((key, bytes))) => match read_transform(Ok(bytes)) {
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Ok(val) => Some(Ok((key, val))),
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Err(err) => Some(Err(err)),
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},
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Some(Err(err)) => Some(Err(err.into())),
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}
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}
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}
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