102 lines
2.9 KiB
Rust

// Copyright 2022 Jeremy Wall (Jeremy@marzhilsltudios.com)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::path::Path;
use crate::{
hash::HashWriter,
node::Node,
store::{Result as StoreResult, Store, StoreError},
};
use ciborium;
use rusqlite::{self, OptionalExtension};
pub struct SqliteStore {
conn: rusqlite::Connection,
}
impl SqliteStore {
pub fn connect<P: AsRef<Path>>(path: P) -> Result<Self, rusqlite::Error> {
Ok(Self {
conn: rusqlite::Connection::open(path)?,
})
}
pub fn in_memory() -> Result<Self, rusqlite::Error> {
let me = Self {
conn: rusqlite::Connection::open_in_memory()?,
};
me.init_db()?;
Ok(me)
}
pub fn init_db(&self) -> Result<(), rusqlite::Error> {
self.conn.execute_batch(
"BEGIN;
CREATE TABLE content_store(content_id BLOB PRIMARY KEY, node BLOB NOT NULL);
COMMIT;",
)?;
Ok(())
}
}
impl<HW> Store<HW> for SqliteStore
where
HW: HashWriter,
{
fn contains(&self, id: &[u8]) -> StoreResult<bool> {
let val: Option<Vec<u8>> = self
.conn
.query_row(
"select node from content_store where content_id = ?",
[id],
|r| r.get(0),
)
.optional()?;
Ok(val.is_some())
}
fn get(&self, id: &[u8]) -> StoreResult<Option<Node<HW>>> {
let result: Option<Vec<u8>> = self
.conn
.query_row(
"select node from content_store where content_id = ?",
[id],
|r| r.get(0),
)
.optional()?;
Ok(match result {
Some(bs) => ciborium::de::from_reader(bs.as_slice())
.map_err(|e| StoreError::StoreFailure(format!("Invalid serialization {:?}", e)))?,
None => None,
})
}
fn store(&mut self, node: Node<HW>) -> StoreResult<()> {
let mut buf = Vec::new();
ciborium::ser::into_writer(&node, &mut buf).unwrap();
self.conn.execute(
"insert into content_store (content_id, node) values (?, ?)",
[node.id(), buf.as_slice()],
)?;
Ok(())
}
}
impl From<rusqlite::Error> for StoreError {
fn from(e: rusqlite::Error) -> Self {
StoreError::StoreFailure(format!("{:?}", e))
}
}