Module storage

Stuff to do with the runtime’s storage.

Re-exports

pub use self::transactional::in_storage_layer;

pub use self::transactional::with_storage_layer;

pub use self::transactional::with_transaction;

pub use self::transactional::with_transaction_unchecked;

pub use self::types::StorageEntryMetadataBuilder;

pub use types::Key;

Modules

bounded_btree_map

Traits, types and structs to support a bounded BTreeMap.

bounded_btree_set

Traits, types and structs to support a bounded BTreeSet.

bounded_vec

Traits, types and structs to support putting a bounded vector into storage, as a raw value, map or a double map.

child

Operation on runtime child storages.

hashed

Operation on runtime storage using hashed keys.

migration

Some utilities for helping access storage with arbitrary key types.

storage_noop_guard

Contains the crate::StorageNoopGuard for conveniently asserting that no storage mutation has been made by a whole code block.

transactional

Provides functionality around the transaction storage.

types

Storage types to build abstraction on storage, they implements storage traits such as StorageMap and others.

unhashed

Operation on unhashed runtime storage.

weak_bounded_vec

Traits, types and structs to support putting a bounded vector into storage, as a raw value, map or a double map.

Structs

ChildTriePrefixIterator

Iterate over a prefix of a child trie and decode raw_key and raw_value into T.

KeyLenOf

Utility type for converting a storage map into a Get<u32> impl which returns the maximum key size.

KeyPrefixIterator

Iterate over a prefix and decode raw_key into T.

PrefixIterator

Iterate or drain over a prefix and decode raw_key and raw_value into T.

Enums

TransactionOutcome

Describes on what should happen with a storage transaction.

Traits

IterableStorageDoubleMap

A strongly-typed double map in storage whose secondary keys and values can be iterated over.

IterableStorageMap

A strongly-typed map in storage whose keys and values can be iterated over.

IterableStorageNMap

A strongly-typed map with arbitrary number of keys in storage whose keys and values can be iterated over.

PrefixIteratorOnRemoval

Trait for specialising on removal logic of PrefixIterator.

StorageAppend

Marker trait that will be implemented for types that support the storage::append api.

StorageAppender

Append iterator to append values to a storage struct.

StorageDecodeLength

It is expected that the length is at the beginning of the encoded object and that the length is a Compact<u32>.

StorageDecodeNonDedupLength

It is expected that the length is at the beginning of the encoded object and that the length is a Compact<u32>.

StorageDoubleMap

An implementation of a map with a two keys.

StorageList

A non-continuous container type.

StorageMap

A strongly-typed map in storage.

StorageNMap

An implementation of a map with an arbitrary number of keys.

StoragePrefixedContainer

Trait for storage types that store all its value after a unique prefix.

StoragePrefixedMap

Trait for maps that store all its value after a unique prefix.

StorageStreamIter

An iterator that streams values directly from storage.

StorageTryAppend

Marker trait that is implemented for types that support the storage::append api with a limit on the number of element.

StorageValue

A trait for working with macro-generated storage values under the substrate storage API.

TryAppendDoubleMap

Storage double map that is capable of StorageTryAppend.

TryAppendMap

Storage map that is capable of StorageTryAppend.

TryAppendNMap

Storage N map that is capable of StorageTryAppend.

TryAppendValue

Storage value that is capable of StorageTryAppend.

Functions

storage_prefix

Returns the storage prefix for a specific pallet name and storage name.