Struct frame_support::storage::types::Key
source · pub struct Key<Hasher, KeyType>(/* private fields */);
Expand description
A type used exclusively by storage maps as their key type.
The final key generated has the following form:
Hasher1(encode(key1))
++ Hasher2(encode(key2))
++ ...
++ HasherN(encode(keyN))
Trait Implementations§
source§impl<H: StorageHasher, K: FullCodec + StaticTypeInfo> KeyGenerator for Key<H, K>
impl<H: StorageHasher, K: FullCodec + StaticTypeInfo> KeyGenerator for Key<H, K>
type Key = K
type KArg = (K,)
type HashFn = Box<dyn FnOnce(&[u8]) -> Vec<u8>>
type HArg = (<Key<H, K> as KeyGenerator>::HashFn,)
const HASHER_METADATA: &'static [StorageHasherIR] = _
source§fn final_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>(
key: KArg,
) -> Vec<u8> ⓘ
fn final_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>( key: KArg, ) -> Vec<u8> ⓘ
Given a
key
tuple, calculate the final key by encoding each element individually and
hashing them using the corresponding hasher in the KeyGenerator
.source§fn migrate_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>(
key: &KArg,
hash_fns: Self::HArg,
) -> Vec<u8> ⓘ
fn migrate_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>( key: &KArg, hash_fns: Self::HArg, ) -> Vec<u8> ⓘ
Given a
key
tuple, migrate the keys from using the old hashers as given by hash_fns
to using the newer hashers as specified by this KeyGenerator
.source§impl<H: StorageHasher, K: FullCodec + MaxEncodedLen + StaticTypeInfo> KeyGeneratorMaxEncodedLen for Key<H, K>
impl<H: StorageHasher, K: FullCodec + MaxEncodedLen + StaticTypeInfo> KeyGeneratorMaxEncodedLen for Key<H, K>
fn key_max_encoded_len() -> usize
source§impl<H: ReversibleStorageHasher, K: FullCodec + StaticTypeInfo> ReversibleKeyGenerator for Key<H, K>
impl<H: ReversibleStorageHasher, K: FullCodec + StaticTypeInfo> ReversibleKeyGenerator for Key<H, K>
type ReversibleHasher = H
fn decode_final_key(key_material: &[u8]) -> Result<(Self::Key, &[u8]), Error>
Auto Trait Implementations§
impl<Hasher, KeyType> Freeze for Key<Hasher, KeyType>
impl<Hasher, KeyType> RefUnwindSafe for Key<Hasher, KeyType>where
Hasher: RefUnwindSafe,
KeyType: RefUnwindSafe,
impl<Hasher, KeyType> Send for Key<Hasher, KeyType>
impl<Hasher, KeyType> Sync for Key<Hasher, KeyType>
impl<Hasher, KeyType> Unpin for Key<Hasher, KeyType>
impl<Hasher, KeyType> UnwindSafe for Key<Hasher, KeyType>where
Hasher: UnwindSafe,
KeyType: UnwindSafe,
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source§impl<T, U> TryIntoKey<U> for Twhere
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