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Paged keys rpc for child storage. (#9100)

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* childstate_getKeysPaged rpc

* Rename `v` to `iter`.

* Update client/api/src/backend.rs

Co-authored-by: Alexander Popiak <alexander.popiak@gmail.com>

* Update client/api/src/backend.rs

Co-authored-by: Alexander Popiak <alexander.popiak@gmail.com>

Co-authored-by: Alexander Popiak <alexander.popiak@gmail.com>
This commit is contained in:
cheme
2021-07-07 09:22:13 +02:00
committed by GitHub
parent fc1199b6a1
commit d80e1bc978
7 changed files with 151 additions and 9 deletions
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substrate/client/api/src/backend.rs
+33 -4
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@@ -280,6 +280,7 @@ pub trait AuxStore {
/// An `Iterator` that iterates keys in a given block under a prefix.
pub struct KeyIterator<'a, State, Block> {
state: State,
child_storage: Option<ChildInfo>,
prefix: Option<&'a StorageKey>,
current_key: Vec<u8>,
_phantom: PhantomData<Block>,
@@ -290,6 +291,23 @@ impl <'a, State, Block> KeyIterator<'a, State, Block> {
pub fn new(state: State, prefix: Option<&'a StorageKey>, current_key: Vec<u8>) -> Self {
Self {
state,
child_storage: None,
prefix,
current_key,
_phantom: PhantomData,
}
}
/// Create a `KeyIterator` instance for a child storage.
pub fn new_child(
state: State,
child_info: ChildInfo,
prefix: Option<&'a StorageKey>,
current_key: Vec<u8>,
) -> Self {
Self {
state,
child_storage: Some(child_info),
prefix,
current_key,
_phantom: PhantomData,
@@ -304,10 +322,11 @@ impl<'a, State, Block> Iterator for KeyIterator<'a, State, Block> where
type Item = StorageKey;
fn next(&mut self) -> Option<Self::Item> {
let next_key = self.state
.next_storage_key(&self.current_key)
.ok()
.flatten()?;
let next_key = if let Some(child_info) = self.child_storage.as_ref() {
self.state.next_child_storage_key(child_info, &self.current_key)
} else {
self.state.next_storage_key(&self.current_key)
}.ok().flatten()?;
// this terminates the iterator the first time it fails.
if let Some(prefix) = self.prefix {
if !next_key.starts_with(&prefix.0[..]) {
@@ -361,6 +380,16 @@ pub trait StorageProvider<Block: BlockT, B: Backend<Block>> {
key_prefix: &StorageKey
) -> sp_blockchain::Result<Vec<StorageKey>>;
/// Given a `BlockId` and a key `prefix` and a child storage key,
/// return a `KeyIterator` that iterates matching storage keys in that block.
fn child_storage_keys_iter<'a>(
&self,
id: &BlockId<Block>,
child_info: ChildInfo,
prefix: Option<&'a StorageKey>,
start_key: Option<&StorageKey>
) -> sp_blockchain::Result<KeyIterator<'a, B::State, Block>>;
/// Given a `BlockId`, a key and a child storage key, return the hash under the key in that block.
fn child_storage_hash(
&self,