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Allow capping the amount of work performed when deleting a child trie (#7671)

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* Allow Backend::for_keys_in_child_storage to be aborted by the closure

* Ext::kill_child_storage now takes an upper limit for backend deletion

* Add Storage::storage_kill_limited() runtime interface

* review: Use a new version of kill_storage instead of a new interface

* review: Simplify boolean expression

Co-authored-by: cheme <emericchevalier.pro@gmail.com>

* review: Rename for_keys_in_child_storage

Co-authored-by: cheme <emericchevalier.pro@gmail.com>
This commit is contained in:
Alexander Theißen
2020-12-09 02:17:28 +01:00
committed by GitHub
parent 4689c21069
commit 9ce24fe1f4
19 changed files with 219 additions and 34 deletions
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substrate/primitives/state-machine/src/backend.rs
+4 -3
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@@ -94,7 +94,8 @@ pub trait Backend<H: Hasher>: sp_std::fmt::Debug {
) -> Result<Option<StorageKey>, Self::Error>;
/// Retrieve all entries keys of child storage and call `f` for each of those keys.
fn for_keys_in_child_storage<F: FnMut(&[u8])>(
/// Aborts as soon as `f` returns false.
fn apply_to_child_keys_while<F: FnMut(&[u8]) -> bool>(
&self,
child_info: &ChildInfo,
f: F,
@@ -263,12 +264,12 @@ impl<'a, T: Backend<H>, H: Hasher> Backend<H> for &'a T {
(*self).child_storage(child_info, key)
}
fn for_keys_in_child_storage<F: FnMut(&[u8])>(
fn apply_to_child_keys_while<F: FnMut(&[u8]) -> bool>(
&self,
child_info: &ChildInfo,
f: F,
) {
(*self).for_keys_in_child_storage(child_info, f)
(*self).apply_to_child_keys_while(child_info, f)
}
fn next_storage_key(&self, key: &[u8]) -> Result<Option<StorageKey>, Self::Error> {