Module frame_support::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.