Storage

StorageKey

A StorageKey instance is a representation of a single state entry.

Substrate uses a simple key-value data store implemented as a database-backed, modified Merkle tree. All of Substrate's higher-level storage abstractions are built on top of this simple key-value store.

create_from_data(data: bytes, runtime_config: RuntimeConfigurationObject, metadata: GenericMetadataVersioned, value_scale_type: str = None, pallet: str = None, storage_function: str = None) -> StorageKey classmethod

Create a StorageKey instance providing raw storage key bytes

Parameters:

Name	Type	Description	Default
data	bytes		required
runtime_config	RuntimeConfigurationObject		required
metadata	GenericMetadataVersioned		required
value_scale_type	str		None
pallet	str		None
storage_function	str		None

Returns:

Type	Description
StorageKey

create_from_storage_function(pallet: str, storage_function: str, params: list, runtime_config: RuntimeConfigurationObject, metadata: GenericMetadataVersioned) -> StorageKey classmethod

Create a StorageKey instance providing storage function details

Parameters:

Name	Type	Description	Default
pallet	str		required
storage_function	str		required
params	list		required
runtime_config	RuntimeConfigurationObject		required
metadata	GenericMetadataVersioned		required

Returns:

Type	Description
StorageKey

to_hex() -> str

Returns a Hex-string representation of current StorageKey data

Returns:

Type	Description
str	Hex string

generate() -> bytes

Generate a storage key for current specified pallet/function/params

Returns:

Type	Description
bytes

decode_scale_value(data: Optional[ScaleBytes] = None) -> ScaleType

Parameters:

Name	Type	Description	Default
data	Optional[ScaleBytes]		None