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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/trie/src/lib.rs
+5 -2
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@@ -271,7 +271,8 @@ pub fn child_delta_trie_root<L: TrieConfiguration, I, A, B, DB, RD, V>(
}
/// Call `f` for all keys in a child trie.
pub fn for_keys_in_child_trie<L: TrieConfiguration, F: FnMut(&[u8]), DB>(
/// Aborts as soon as `f` returns false.
pub fn for_keys_in_child_trie<L: TrieConfiguration, F: FnMut(&[u8]) -> bool, DB>(
keyspace: &[u8],
db: &DB,
root_slice: &[u8],
@@ -290,7 +291,9 @@ pub fn for_keys_in_child_trie<L: TrieConfiguration, F: FnMut(&[u8]), DB>(
for x in iter {
let (key, _) = x?;
f(&key);
if !f(&key) {
break;
}
}
Ok(())