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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/basic.rs
+4 -2
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@@ -210,8 +210,10 @@ impl Externalities for BasicExternalities {
fn kill_child_storage(
&mut self,
child_info: &ChildInfo,
) {
_limit: Option<u32>,
) -> bool {
self.inner.children_default.remove(child_info.storage_key());
true
}
fn clear_prefix(&mut self, prefix: &[u8]) {
@@ -407,7 +409,7 @@ mod tests {
ext.clear_child_storage(child_info, b"dog");
assert_eq!(ext.child_storage(child_info, b"dog"), None);
ext.kill_child_storage(child_info);
ext.kill_child_storage(child_info, None);
assert_eq!(ext.child_storage(child_info, b"doe"), None);
}