optimize get w/ zero-copy ref handle

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/handle.rs

@@ -0,0 +1,25 @@
+use std::ops::Deref;
+
+use rocksdb::DBPinnableSlice;
+
+pub struct Handle<'a> {
+	val: DBPinnableSlice<'a>,
+}
+
+impl<'a> From<DBPinnableSlice<'a>> for Handle<'a> {
+	fn from(val: DBPinnableSlice<'a>) -> Self {
+		Self {
+			val,
+		}
+	}
+}
+
+impl Deref for Handle<'_> {
+	type Target = [u8];
+
+	fn deref(&self) -> &Self::Target { &self.val }
+}
+
+impl AsRef<[u8]> for Handle<'_> {
+	fn as_ref(&self) -> &[u8] { &self.val }
+}