Snapshot item

packages/storage-plus/src/indexed_snapshot.rs

@@ -7,29 +7,19 @@ use serde::Serialize;
 
 use crate::keys::{EmptyPrefix, Prefixer, PrimaryKey};
 use crate::prefix::{Bound, Prefix};
-use crate::snapshot::SnapshotMap;
+use crate::snapshot_map::SnapshotMap;
 use crate::{IndexList, Path, Strategy};
 
 /// IndexedSnapshotMap works like a SnapshotMap but has a secondary index
-pub struct IndexedSnapshotMap<'a, K, T, I>
-where
-    K: PrimaryKey<'a>,
-    T: Serialize + DeserializeOwned + Clone,
-    I: IndexList<T>,
-{
+pub struct IndexedSnapshotMap<'a, K, T, I> {
     pk_namespace: &'a [u8],
     primary: SnapshotMap<'a, K, T>,
     /// This is meant to be read directly to get the proper types, like:
     /// map.idx.owner.items(...)
     pub idx: I,
 }
 
-impl<'a, K, T, I> IndexedSnapshotMap<'a, K, T, I>
-where
-    K: PrimaryKey<'a>,
-    T: Serialize + DeserializeOwned + Clone,
-    I: IndexList<T>,
-{
+impl<'a, K, T, I> IndexedSnapshotMap<'a, K, T, I> {
     pub fn new(
         pk_namespace: &'a str,
         checkpoints: &'a str,
@@ -43,22 +33,22 @@ where
             idx: indexes,
         }
     }
+}
 
+impl<'a, K, T, I> IndexedSnapshotMap<'a, K, T, I>
+where
+    T: Serialize + DeserializeOwned + Clone,
+    K: PrimaryKey<'a> + Prefixer<'a>,
+    I: IndexList<T>,
+{
     pub fn add_checkpoint(&self, store: &mut dyn Storage, height: u64) -> StdResult<()> {
         self.primary.add_checkpoint(store, height)
     }
 
     pub fn remove_checkpoint(&self, store: &mut dyn Storage, height: u64) -> StdResult<()> {
         self.primary.remove_checkpoint(store, height)
     }
-}
 
-impl<'a, K, T, I> IndexedSnapshotMap<'a, K, T, I>
-where
-    T: Serialize + DeserializeOwned + Clone,
-    K: PrimaryKey<'a> + Prefixer<'a>,
-    I: IndexList<T>,
-{
     pub fn may_load_at_height(
         &self,
         store: &dyn Storage,

packages/storage-plus/src/keys.rs

@@ -19,6 +19,16 @@ pub trait PrimaryKey<'a>: Clone {
     }
 }
 
+// Empty / no primary key
+impl<'a> PrimaryKey<'a> for () {
+    type Prefix = ();
+    type SubPrefix = ();
+
+    fn key(&self) -> Vec<&[u8]> {
+        vec![]
+    }
+}
+
 impl<'a> PrimaryKey<'a> for &'a [u8] {
     type Prefix = ();
     type SubPrefix = ();

packages/storage-plus/src/lib.rs

@@ -10,6 +10,8 @@ mod map;
 mod path;
 mod prefix;
 mod snapshot;
+mod snapshot_item;
+mod snapshot_map;
 
 pub use endian::Endian;
 #[cfg(feature = "iterator")]
@@ -27,5 +29,7 @@ pub use map::Map;
 pub use path::Path;
 #[cfg(feature = "iterator")]
 pub use prefix::{range_with_prefix, Bound, Prefix};
+pub use snapshot::Strategy;
+pub use snapshot_item::SnapshotItem;
 #[cfg(feature = "iterator")]
-pub use snapshot::{SnapshotMap, Strategy};
+pub use snapshot_map::SnapshotMap;