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chainHead: Add support for storage closest merkle descendant #14818 (#1153)

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This PR adds support for fetching the closest merkle value of some key.


Builds on top of
- https://github.com/paritytech/trie/pull/199

Migrates https://github.com/paritytech/substrate/pull/14818 to the
monorepo.
Closes: https://github.com/paritytech/substrate/issues/14550
Closes: https://github.com/paritytech/polkadot-sdk/issues/1506

// @paritytech/subxt-team

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Sebastian Kunert <skunert49@gmail.com>
This commit is contained in:
Alexandru Vasile
2023-09-18 13:54:44 +03:00
committed by GitHub
parent 20052e1675
commit 5d346643ca
15 changed files with 449 additions and 28 deletions
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substrate/client/api/src/backend.rs
+16
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@@ -33,6 +33,7 @@ use sp_state_machine::{
OffchainChangesCollection, StorageCollection, StorageIterator,
};
use sp_storage::{ChildInfo, StorageData, StorageKey};
pub use sp_trie::MerkleValue;
use crate::{blockchain::Backend as BlockchainBackend, UsageInfo};
@@ -470,6 +471,21 @@ pub trait StorageProvider<Block: BlockT, B: Backend<Block>> {
child_info: &ChildInfo,
key: &StorageKey,
) -> sp_blockchain::Result<Option<Block::Hash>>;
/// Given a block's `Hash` and a key, return the closest merkle value.
fn closest_merkle_value(
&self,
hash: Block::Hash,
key: &StorageKey,
) -> sp_blockchain::Result<Option<MerkleValue<Block::Hash>>>;
/// Given a block's `Hash`, a key and a child storage key, return the closest merkle value.
fn child_closest_merkle_value(
&self,
hash: Block::Hash,
child_info: &ChildInfo,
key: &StorageKey,
) -> sp_blockchain::Result<Option<MerkleValue<Block::Hash>>>;
}
/// Client backend.