275 lines
6.8 KiB
Rust
275 lines
6.8 KiB
Rust
use core::ops::Bound;
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use std::cell::Cell;
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use std::collections::HashMap;
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use std::sync::{Arc, RwLock};
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use sled::transaction::{
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ConflictableTransactionError, TransactionError, Transactional, TransactionalTree,
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UnabortableTransactionError,
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};
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use crate::{
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Db, Error, IDb, ITx, ITxFn, OnCommit, Result, TxError, TxFnResult, TxOpError, TxOpResult,
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TxResult, TxValueIter, Value, ValueIter,
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};
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pub use sled;
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// -- err
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impl From<sled::Error> for Error {
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fn from(e: sled::Error) -> Error {
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Error(format!("Sled: {}", e).into())
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}
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}
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impl From<sled::Error> for TxOpError {
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fn from(e: sled::Error) -> TxOpError {
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TxOpError(e.into())
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}
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}
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// -- db
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pub struct SledDb {
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db: sled::Db,
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trees: RwLock<(Vec<sled::Tree>, HashMap<String, usize>)>,
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}
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impl SledDb {
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#[deprecated(
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since = "0.9.0",
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note = "The Sled database is now deprecated and will be removed in Garage v1.0. Please migrate to LMDB or Sqlite as soon as possible."
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)]
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pub fn init(db: sled::Db) -> Db {
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tracing::warn!("-------------------- IMPORTANT WARNING !!! ----------------------");
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tracing::warn!("The Sled database is now deprecated and will be removed in Garage v1.0.");
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tracing::warn!("Please migrate to LMDB or Sqlite as soon as possible.");
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tracing::warn!("-----------------------------------------------------------------------");
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let s = Self {
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db,
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trees: RwLock::new((Vec::new(), HashMap::new())),
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};
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Db(Arc::new(s))
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}
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fn get_tree(&self, i: usize) -> Result<sled::Tree> {
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self.trees
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.read()
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.unwrap()
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.0
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.get(i)
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.cloned()
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.ok_or_else(|| Error("invalid tree id".into()))
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}
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}
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impl IDb for SledDb {
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fn engine(&self) -> String {
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"Sled".into()
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}
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fn open_tree(&self, name: &str) -> Result<usize> {
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let mut trees = self.trees.write().unwrap();
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if let Some(i) = trees.1.get(name) {
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Ok(*i)
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} else {
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let tree = self.db.open_tree(name)?;
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let i = trees.0.len();
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trees.0.push(tree);
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trees.1.insert(name.to_string(), i);
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Ok(i)
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}
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}
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fn list_trees(&self) -> Result<Vec<String>> {
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let mut trees = vec![];
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for name in self.db.tree_names() {
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let name = std::str::from_utf8(&name)
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.map_err(|e| Error(format!("{}", e).into()))?
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.to_string();
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if name != "__sled__default" {
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trees.push(name);
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}
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}
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Ok(trees)
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}
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// ----
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fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let val = tree.get(key)?;
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Ok(val.map(|x| x.to_vec()))
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}
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fn len(&self, tree: usize) -> Result<usize> {
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let tree = self.get_tree(tree)?;
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Ok(tree.len())
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}
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fn insert(&self, tree: usize, key: &[u8], value: &[u8]) -> Result<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let old_val = tree.insert(key, value)?;
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Ok(old_val.map(|x| x.to_vec()))
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}
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fn remove(&self, tree: usize, key: &[u8]) -> Result<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let old_val = tree.remove(key)?;
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Ok(old_val.map(|x| x.to_vec()))
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}
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fn clear(&self, tree: usize) -> Result<()> {
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let tree = self.get_tree(tree)?;
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tree.clear()?;
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Ok(())
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}
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fn iter(&self, tree: usize) -> Result<ValueIter<'_>> {
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let tree = self.get_tree(tree)?;
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Ok(Box::new(tree.iter().map(|v| {
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v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
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})))
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}
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fn iter_rev(&self, tree: usize) -> Result<ValueIter<'_>> {
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let tree = self.get_tree(tree)?;
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Ok(Box::new(tree.iter().rev().map(|v| {
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v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
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})))
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}
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fn range<'r>(
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&self,
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tree: usize,
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low: Bound<&'r [u8]>,
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high: Bound<&'r [u8]>,
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) -> Result<ValueIter<'_>> {
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let tree = self.get_tree(tree)?;
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Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).map(|v| {
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v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into)
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})))
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}
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fn range_rev<'r>(
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&self,
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tree: usize,
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low: Bound<&'r [u8]>,
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high: Bound<&'r [u8]>,
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) -> Result<ValueIter<'_>> {
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let tree = self.get_tree(tree)?;
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Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).rev().map(
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|v| v.map(|(x, y)| (x.to_vec(), y.to_vec())).map_err(Into::into),
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)))
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}
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// ----
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fn transaction(&self, f: &dyn ITxFn) -> TxResult<OnCommit, ()> {
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let trees = self.trees.read().unwrap();
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let res = trees.0.transaction(|txtrees| {
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let mut tx = SledTx {
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trees: txtrees,
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err: Cell::new(None),
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};
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match f.try_on(&mut tx) {
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TxFnResult::Ok(on_commit) => {
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assert!(tx.err.into_inner().is_none());
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Ok(on_commit)
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}
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TxFnResult::Abort => {
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assert!(tx.err.into_inner().is_none());
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Err(ConflictableTransactionError::Abort(()))
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}
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TxFnResult::DbErr => {
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let e = tx.err.into_inner().expect("No DB error");
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Err(e.into())
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}
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}
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});
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match res {
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Ok(on_commit) => Ok(on_commit),
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Err(TransactionError::Abort(())) => Err(TxError::Abort(())),
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Err(TransactionError::Storage(s)) => Err(TxError::Db(s.into())),
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}
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}
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}
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// ----
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struct SledTx<'a> {
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trees: &'a [TransactionalTree],
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err: Cell<Option<UnabortableTransactionError>>,
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}
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impl<'a> SledTx<'a> {
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fn get_tree(&self, i: usize) -> TxOpResult<&TransactionalTree> {
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self.trees.get(i).ok_or_else(|| {
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TxOpError(Error(
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"invalid tree id (it might have been openned after the transaction started)".into(),
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))
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})
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}
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fn save_error<R>(
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&self,
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v: std::result::Result<R, UnabortableTransactionError>,
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) -> TxOpResult<R> {
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match v {
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Ok(x) => Ok(x),
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Err(e) => {
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let txt = format!("{}", e);
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self.err.set(Some(e));
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Err(TxOpError(Error(txt.into())))
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}
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}
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}
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}
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impl<'a> ITx for SledTx<'a> {
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fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let tmp = self.save_error(tree.get(key))?;
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Ok(tmp.map(|x| x.to_vec()))
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}
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fn len(&self, _tree: usize) -> TxOpResult<usize> {
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unimplemented!(".len() in transaction not supported with Sled backend")
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}
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fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let old_val = self.save_error(tree.insert(key, value))?;
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Ok(old_val.map(|x| x.to_vec()))
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}
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fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
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let tree = self.get_tree(tree)?;
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let old_val = self.save_error(tree.remove(key))?;
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Ok(old_val.map(|x| x.to_vec()))
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}
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fn iter(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
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unimplemented!("Iterators in transactions not supported with Sled backend");
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}
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fn iter_rev(&self, _tree: usize) -> TxOpResult<TxValueIter<'_>> {
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unimplemented!("Iterators in transactions not supported with Sled backend");
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}
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fn range<'r>(
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&self,
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_tree: usize,
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_low: Bound<&'r [u8]>,
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_high: Bound<&'r [u8]>,
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) -> TxOpResult<TxValueIter<'_>> {
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unimplemented!("Iterators in transactions not supported with Sled backend");
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}
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fn range_rev<'r>(
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&self,
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_tree: usize,
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_low: Bound<&'r [u8]>,
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_high: Bound<&'r [u8]>,
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) -> TxOpResult<TxValueIter<'_>> {
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unimplemented!("Iterators in transactions not supported with Sled backend");
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}
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}
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