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.
• StorageDecodeLength
  Marker trait that will be implemented for types that support to decode their length in an efficient way. 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.
• StorageMap
  A strongly-typed map in storage.
• StorageNMap
  An implementation of a map with an arbitrary number of keys.
• 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.
• TryAppendValue
  Storage value that is capable of StorageTryAppend.

Functions

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