Change value type to be a dyn thing

Cargo.lock

@@ -1015,6 +1015,7 @@ name = "garage_db"
 version = "0.8.0"
 dependencies = [
  "err-derive 0.3.1",
+ "hexdump",
  "mktemp",
  "rusqlite",
  "sled",

src/block/manager.rs

@@ -645,7 +645,7 @@ impl BlockManager {
 			None => Ok(None),
 			Some(v) => {
 				let (time_bytes, hash_bytes) = v?;
-				Ok(Some((time_bytes.into_owned(), hash_bytes.into_owned())))
+				Ok(Some((time_bytes.into_vec(), hash_bytes.into_vec())))
 			}
 		}
 	}

src/db/Cargo.toml

@@ -15,6 +15,7 @@ path = "lib.rs"
 
 [dependencies]
 err-derive = "0.3"
+hexdump = "0.1"
 
 sled = "0.34"
 rusqlite = "0.27"

src/db/lib.rs

@@ -21,13 +21,98 @@ pub struct Transaction<'a>(pub(crate) &'a dyn ITx<'a>);
 #[derive(Clone)]
 pub struct Tree(pub(crate) Arc<dyn IDb>, pub(crate) usize);
 
-pub type Value<'a> = Cow<'a, [u8]>;
 pub type ValueIter<'a> = Box<dyn std::iter::Iterator<Item = Result<(Value<'a>, Value<'a>)>> + 'a>;
 
 pub type Exporter<'a> = Box<dyn std::iter::Iterator<Item = Result<(String, ValueIter<'a>)>> + 'a>;
 
 // ----
 
+pub struct Value<'a>(pub(crate) Box<dyn IValue<'a> + 'a>);
+
+pub trait IValue<'a>: AsRef<[u8]> {
+	fn into_vec(&mut self) -> Vec<u8>;
+}
+
+impl<'a> Value<'a> {
+	#[inline]
+	pub fn into_vec(mut self) -> Vec<u8> {
+		self.0.into_vec()
+	}
+}
+
+impl<'a> AsRef<[u8]> for Value<'a> {
+	#[inline]
+	fn as_ref(&self) -> &[u8] {
+		self.0.as_ref().as_ref()
+	}
+}
+
+impl<'a> std::borrow::Borrow<[u8]> for Value<'a> {
+	#[inline]
+	fn borrow(&self) -> &[u8] {
+		self.0.as_ref().as_ref()
+	}
+}
+
+impl<'a> core::ops::Deref for Value<'a> {
+	type Target = [u8];
+	#[inline]
+	fn deref(&self) -> &[u8] {
+		self.0.as_ref().as_ref()
+	}
+}
+
+impl<'a, T> PartialEq<T> for Value<'a>
+where
+	T: AsRef<[u8]>,
+{
+	fn eq(&self, other: &T) -> bool {
+		self.as_ref() == other.as_ref()
+	}
+}
+
+impl<'a> std::fmt::Debug for Value<'a> {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		for line in hexdump::hexdump_iter(self.as_ref()) {
+			f.write_str(&line)?;
+			f.write_str("\n")?;
+		}
+		Ok(())
+	}
+}
+
+impl<'a> IValue<'a> for Vec<u8> {
+	fn into_vec(&mut self) -> Vec<u8> {
+		std::mem::take(self)
+	}
+}
+
+impl<'a> From<Value<'a>> for Vec<u8> {
+	fn from(v: Value<'a>) -> Vec<u8> {
+		v.into_vec()
+	}
+}
+
+impl<'a> From<Vec<u8>> for Value<'a> {
+	fn from(v: Vec<u8>) -> Value<'a> {
+		Value(Box::new(v))
+	}
+}
+
+impl<'a> From<&'a [u8]> for Value<'a> {
+	fn from(v: &'a [u8]) -> Value<'a> {
+		Value(Box::new(v))
+	}
+}
+
+impl<'a> IValue<'a> for &'a [u8] {
+	fn into_vec(&mut self) -> Vec<u8> {
+		self.to_vec()
+	}
+}
+
+// ----
+
 #[derive(Debug, Error)]
 #[error(display = "{}", _0)]
 pub struct Error(Cow<'static, str>);

src/db/sled_adapter.rs

@@ -10,17 +10,42 @@ use sled::transaction::{
 };
 
 use crate::{
-	Db, Error, Exporter, IDb, ITx, ITxFn, Result, TxError, TxFnResult, TxResult, Value, ValueIter,
+	Db, Error, Exporter, IDb, ITx, ITxFn, IValue, Result, TxError, TxFnResult, TxResult, Value,
+	ValueIter,
 };
 
 pub use sled;
 
+// -- err
+
 impl From<sled::Error> for Error {
 	fn from(e: sled::Error) -> Error {
 		Error(format!("{}", e).into())
 	}
 }
 
+// -- val
+
+impl<'a> IValue<'a> for sled::IVec {
+	fn into_vec(&mut self) -> Vec<u8> {
+		self.to_vec()
+	}
+}
+
+impl<'a> From<Value<'a>> for sled::IVec {
+	fn from(v: Value<'a>) -> sled::IVec {
+		sled::IVec::from(v.into_vec())
+	}
+}
+
+impl<'a> From<sled::IVec> for Value<'a> {
+	fn from(v: sled::IVec) -> Value<'a> {
+		Value(Box::new(v))
+	}
+}
+
+// -- db
+
 pub struct SledDb {
 	db: sled::Db,
 	trees: RwLock<(Vec<sled::Tree>, HashMap<String, usize>)>,
@@ -64,7 +89,7 @@ impl IDb for SledDb {
 
 	fn get<'a>(&'a self, tree: usize, key: &[u8]) -> Result<Option<Value<'a>>> {
 		let tree = self.get_tree(tree)?;
-		Ok(tree.get(key)?.map(|v| v.to_vec().into()))
+		Ok(tree.get(key)?.map(From::from))
 	}
 
 	fn remove(&self, tree: usize, key: &[u8]) -> Result<bool> {
@@ -86,16 +111,14 @@ impl IDb for SledDb {
 	fn iter<'a>(&'a self, tree: usize) -> Result<ValueIter<'a>> {
 		let tree = self.get_tree(tree)?;
 		Ok(Box::new(tree.iter().map(|v| {
-			v.map(|(x, y)| (x.to_vec().into(), y.to_vec().into()))
-				.map_err(Into::into)
+			v.map(|(x, y)| (x.into(), y.into())).map_err(Into::into)
 		})))
 	}
 
 	fn iter_rev<'a>(&'a self, tree: usize) -> Result<ValueIter<'a>> {
 		let tree = self.get_tree(tree)?;
 		Ok(Box::new(tree.iter().rev().map(|v| {
-			v.map(|(x, y)| (x.to_vec().into(), y.to_vec().into()))
-				.map_err(Into::into)
+			v.map(|(x, y)| (x.into(), y.into())).map_err(Into::into)
 		})))
 	}
 
@@ -107,8 +130,7 @@ impl IDb for SledDb {
 	) -> Result<ValueIter<'a>> {
 		let tree = self.get_tree(tree)?;
 		Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).map(|v| {
-			v.map(|(x, y)| (x.to_vec().into(), y.to_vec().into()))
-				.map_err(Into::into)
+			v.map(|(x, y)| (x.into(), y.into())).map_err(Into::into)
 		})))
 	}
 	fn range_rev<'a, 'r>(
@@ -119,10 +141,7 @@ impl IDb for SledDb {
 	) -> Result<ValueIter<'a>> {
 		let tree = self.get_tree(tree)?;
 		Ok(Box::new(tree.range::<&'r [u8], _>((low, high)).rev().map(
-			|v| {
-				v.map(|(x, y)| (x.to_vec().into(), y.to_vec().into()))
-					.map_err(Into::into)
-			},
+			|v| v.map(|(x, y)| (x.into(), y.into())).map_err(Into::into),
 		)))
 	}
 
@@ -170,10 +189,10 @@ impl IDb for SledDb {
 			trees.push((name, tree));
 		}
 		let trees_exporter: Exporter<'a> = Box::new(trees.into_iter().map(|(name, tree)| {
-			let iter: ValueIter<'a> = Box::new(tree.iter().map(|v| {
-				v.map(|(x, y)| (x.to_vec().into(), y.to_vec().into()))
-					.map_err(Into::into)
-			}));
+			let iter: ValueIter<'a> = Box::new(
+				tree.iter()
+					.map(|v| v.map(|(x, y)| (x.into(), y.into())).map_err(Into::into)),
+			);
 			Ok((name.to_string(), iter))
 		}));
 		Ok(trees_exporter)
@@ -192,7 +211,7 @@ impl IDb for SledDb {
 			let mut i = 0;
 			for item in data {
 				let (k, v) = item?;
-				tree.insert(k.as_ref(), v.as_ref())?;
+				tree.insert(k, v)?;
 				i += 1;
 				if i % 1000 == 0 {
 					println!("{}: imported {}", name, i);
@@ -236,7 +255,7 @@ impl<'a> ITx<'a> for SledTx<'a> {
 	fn get(&self, tree: usize, key: &[u8]) -> Result<Option<Value<'a>>> {
 		let tree = self.get_tree(tree)?;
 		let tmp = self.save_error(tree.get(key))?;
-		Ok(tmp.map(|v| v.to_vec().into()))
+		Ok(tmp.map(From::from))
 	}
 	fn len(&self, _tree: usize) -> Result<usize> {
 		unimplemented!(".len() in transaction not supported with Sled backend")

src/db/sqlite_adapter.rs

@@ -13,6 +13,8 @@ use crate::{
 
 pub use rusqlite;
 
+// --- err
+
 impl From<rusqlite::Error> for Error {
 	fn from(e: rusqlite::Error) -> Error {
 		Error(format!("{}", e).into())
@@ -25,6 +27,8 @@ impl<T> From<rusqlite::Error> for TxError<T> {
 	}
 }
 
+// -- db
+
 pub struct SqliteDb {
 	db: Mutex<Connection>,
 	trees: RwLock<Vec<String>>,

src/db/test.rs

@@ -14,59 +14,66 @@ fn test_suite(db: Db) {
 	let vc: &[u8] = &b"plup"[..];
 
 	tree.insert(ka, va).unwrap();
-	assert_eq!(tree.get(ka).unwrap(), Some(va.into()));
+	assert_eq!(tree.get(ka).unwrap().unwrap(), va);
 
 	let res = db.transaction::<_, (), _>(|tx| {
-		assert_eq!(tx.get(&tree, ka).unwrap(), Some(va.into()));
+		assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), va);
 
 		tx.insert(&tree, ka, vb).unwrap();
 
-		assert_eq!(tx.get(&tree, ka).unwrap(), Some(vb.into()));
+		assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vb);
 
 		tx.commit(12)
 	});
 	assert!(matches!(res, Ok(12)));
-	assert_eq!(tree.get(ka).unwrap(), Some(vb.into()));
+	assert_eq!(tree.get(ka).unwrap().unwrap(), vb);
 
 	let res = db.transaction::<(), _, _>(|tx| {
-		assert_eq!(tx.get(&tree, ka).unwrap(), Some(vb.into()));
+		assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vb);
 
 		tx.insert(&tree, ka, vc).unwrap();
 
-		assert_eq!(tx.get(&tree, ka).unwrap(), Some(vc.into()));
+		assert_eq!(tx.get(&tree, ka).unwrap().unwrap(), vc);
 
 		tx.abort(42)
 	});
 	assert!(matches!(res, Err(TxError::Abort(42))));
-	assert_eq!(tree.get(ka).unwrap(), Some(vb.into()));
+	assert_eq!(tree.get(ka).unwrap().unwrap(), vb);
 
 	let mut iter = tree.iter().unwrap();
-	assert_eq!(iter.next().unwrap().unwrap(), (ka.into(), vb.into()));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
 	assert!(iter.next().is_none());
 	drop(iter);
 
 	tree.insert(kb, vc).unwrap();
-	assert_eq!(tree.get(kb).unwrap(), Some(vc.into()));
+	assert_eq!(tree.get(kb).unwrap().unwrap(), vc);
 
 	let mut iter = tree.iter().unwrap();
-	assert_eq!(iter.next().unwrap().unwrap(), (ka.into(), vb.into()));
-	assert_eq!(iter.next().unwrap().unwrap(), (kb.into(), vc.into()));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
 	assert!(iter.next().is_none());
 	drop(iter);
 
 	let mut iter = tree.range(kint..).unwrap();
-	assert_eq!(iter.next().unwrap().unwrap(), (kb.into(), vc.into()));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
 	assert!(iter.next().is_none());
 	drop(iter);
 
 	let mut iter = tree.range_rev(..kint).unwrap();
-	assert_eq!(iter.next().unwrap().unwrap(), (ka.into(), vb.into()));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
 	assert!(iter.next().is_none());
 	drop(iter);
 
 	let mut iter = tree.iter_rev().unwrap();
-	assert_eq!(iter.next().unwrap().unwrap(), (kb.into(), vc.into()));
-	assert_eq!(iter.next().unwrap().unwrap(), (ka.into(), vb.into()));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (kb, vc));
+	let next = iter.next().unwrap().unwrap();
+	assert_eq!((next.0.as_ref(), next.1.as_ref()), (ka, vb));
 	assert!(iter.next().is_none());
 	drop(iter);
 }

src/garage/repair.rs

@@ -117,7 +117,7 @@ impl Repair {
 			None => Ok(None),
 			Some(item) => {
 				let (item_key, item_bytes) = item?;
-				Ok(Some((item_key.into_owned(), item_bytes.into_owned())))
+				Ok(Some((item_key.into_vec(), item_bytes.into_vec())))
 			}
 		}
 	}
@@ -173,7 +173,7 @@ impl Repair {
 			None => Ok(None),
 			Some(item) => {
 				let (item_key, item_bytes) = item?;
-				Ok(Some((item_key.into_owned(), item_bytes.into_owned())))
+				Ok(Some((item_key.into_vec(), item_bytes.into_vec())))
 			}
 		}
 	}

src/table/data.rs

@@ -276,7 +276,7 @@ where
 				if blake2sum(&cur_v[..]) == vhash {
 					tx.remove(&self.store, k)?;
 					tx.insert(&self.merkle_todo, k, vec![])?;
-					return Ok(Some(cur_v.into_owned()));
+					return Ok(Some(cur_v.into_vec()));
 				}
 			}
 			Ok(None)

src/table/gc.rs

@@ -378,9 +378,12 @@ impl GcTodoEntry {
 		let key = self.todo_table_key();
 		gc_todo_tree.db().transaction(|tx| {
 			let old_val = tx.get(gc_todo_tree, &key)?;
-			if old_val == Some(self.value_hash.as_slice().into()) {
+			match old_val {
+				Some(ov) if ov == self.value_hash.as_slice() => {
 					tx.remove(gc_todo_tree, &key)?;
 				}
+				_ => (),
+			}
 			tx.commit(())
 		})?;
 		Ok(())

src/table/merkle.rs

@@ -142,11 +142,12 @@ where
 
 		let deleted = self.data.merkle_todo.db().transaction(|tx| {
 			let old_val = tx.get(&self.data.merkle_todo, k)?;
-			if old_val == Some(vhash_by.into()) {
+			match old_val {
+				Some(ov) if ov == vhash_by => {
 					tx.remove(&self.data.merkle_todo, k)?;
 					tx.commit(true)
-			} else {
-				tx.commit(false)
+				}
+				_ => tx.commit(false),
 			}
 		})?;