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Support reference-counting state backend. (#5769)

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* Optimize pinning

* Ref counting state backend

* Style

Co-Authored-By: Wei Tang <hi@that.world>

* Update Cargo.lock

* Handle empty node

Co-authored-by: Wei Tang <hi@that.world>
This commit is contained in:
Arkadiy Paronyan
2020-04-27 12:24:50 +02:00
committed by GitHub
parent 636ddd95d2
commit 64ed36d093
11 changed files with 281 additions and 189 deletions
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substrate/primitives/state-machine/src/trie_backend.rs
+2 -8
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@@ -129,11 +129,8 @@ impl<S: TrieBackendStorage<H>, H: Hasher> Backend<H> for TrieBackend<S, H> where
}
fn pairs(&self) -> Vec<(StorageKey, StorageValue)> {
let mut read_overlay = S::Overlay::default();
let eph = Ephemeral::new(self.essence.backend_storage(), &mut read_overlay);
let collect_all = || -> Result<_, Box<TrieError<H::Out>>> {
let trie = TrieDB::<H>::new(&eph, self.essence.root())?;
let trie = TrieDB::<H>::new(self.essence(), self.essence.root())?;
let mut v = Vec::new();
for x in trie.iter()? {
let (key, value) = x?;
@@ -153,11 +150,8 @@ impl<S: TrieBackendStorage<H>, H: Hasher> Backend<H> for TrieBackend<S, H> where
}
fn keys(&self, prefix: &[u8]) -> Vec<StorageKey> {
let mut read_overlay = S::Overlay::default();
let eph = Ephemeral::new(self.essence.backend_storage(), &mut read_overlay);
let collect_all = || -> Result<_, Box<TrieError<H::Out>>> {
let trie = TrieDB::<H>::new(&eph, self.essence.root())?;
let trie = TrieDB::<H>::new(self.essence(), self.essence.root())?;
let mut v = Vec::new();
for x in trie.iter()? {
let (key, _) = x?;