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Define StorageDoubleMapKeyProvider

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Signed-off-by: Serban Iorga <serban@parity.io>
This commit is contained in:
Serban Iorga
2022-07-26 22:50:04 +03:00
committed by Bastian Köcher
parent f9af3f2d6e
commit cd36d1e15f
5 changed files with 100 additions and 65 deletions
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bridges/primitives/parachains/src/lib.rs
+12 -13
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@@ -19,9 +19,10 @@
#![cfg_attr(not(feature = "std"), no_std)]
use bp_polkadot_core::{
parachains::{ParaHash, ParaId},
parachains::{ParaHash, ParaHead, ParaId},
BlockNumber as RelayBlockNumber,
};
use bp_runtime::StorageDoubleMapKeyProvider;
use codec::{Decode, Encode};
use frame_support::{Blake2_128Concat, RuntimeDebug, Twox64Concat};
use scale_info::TypeInfo;
@@ -67,18 +68,16 @@ pub fn best_parachain_head_hash_storage_key_at_target(
)
}
/// Returns runtime storage key of the parachain head with given hash at the target chain.
/// Can be use to access the runtime storage key of the parachain head at the target chain.
///
/// The head is stored by the `pallet-bridge-parachains` pallet in the `ImportedParaHeads` map.
pub fn imported_parachain_head_storage_key_at_target(
bridge_parachains_pallet_name: &str,
para_id: ParaId,
head_hash: ParaHash,
) -> StorageKey {
bp_runtime::storage_double_map_final_key::<Blake2_128Concat, Blake2_128Concat>(
bridge_parachains_pallet_name,
"ImportedParaHeads",
&para_id.encode(),
&head_hash.encode(),
)
pub struct ImportedParaHeadsKeyProvider;
impl StorageDoubleMapKeyProvider for ImportedParaHeadsKeyProvider {
const MAP_NAME: &'static str = "ImportedParaHeads";
type Hasher1 = Blake2_128Concat;
type Key1 = ParaId;
type Hasher2 = Blake2_128Concat;
type Key2 = ParaHash;
type Value = ParaHead;
}