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new state api state_getKeys to expose storage keys (#1380)

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This commit is contained in:
Xiliang Chen
2019-01-12 00:51:19 +13:00
committed by Gav Wood
parent bf51b8a5ad
commit 0e569e6bf2
7 changed files with 56 additions and 0 deletions
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substrate/core/state-machine/src/backend.rs
+7
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@@ -86,6 +86,9 @@ pub trait Backend<H: Hasher> {
/// Get all key/value pairs into a Vec.
fn pairs(&self) -> Vec<(Vec<u8>, Vec<u8>)>;
/// Get all keys with given prefix
fn keys(&self, prefix: &Vec<u8>) -> Vec<Vec<u8>>;
/// Try convert into trie backend.
fn try_into_trie_backend(self) -> Option<TrieBackend<Self::TrieBackendStorage, H>>;
}
@@ -283,6 +286,10 @@ impl<H: Hasher> Backend<H> for InMemory<H> where H::Out: HeapSizeOf {
self.inner.get(&None).into_iter().flat_map(|map| map.iter().map(|(k, v)| (k.clone(), v.clone()))).collect()
}
fn keys(&self, prefix: &Vec<u8>) -> Vec<Vec<u8>> {
self.inner.get(&None).into_iter().flat_map(|map| map.keys().filter(|k| k.starts_with(prefix)).cloned()).collect()
}
fn try_into_trie_backend(self) -> Option<TrieBackend<Self::TrieBackendStorage, H>> {
let mut mdb = MemoryDB::default(); // TODO: should be more correct and use ::new()
let mut root = None;