Crate frame_support

Support code for the runtime.

Re-exports

pub use serde;

pub use self::dispatch::Callable;

pub use self::dispatch::Parameter;

pub use self::storage::bounded_vec::BoundedSlice;

pub use self::storage::bounded_vec::BoundedVec;

pub use self::storage::migration;

pub use self::storage::weak_bounded_vec::WeakBoundedVec;

pub use self::storage::IterableStorageDoubleMap;

pub use self::storage::IterableStorageMap;

pub use self::storage::IterableStorageNMap;

pub use self::storage::StorageDoubleMap;

pub use self::storage::StorageMap;

pub use self::storage::StorageNMap;

pub use self::storage::StoragePrefixedMap;

pub use self::storage::StorageValue;

pub use sp_runtime;

Modules

dispatch

Dispatch system. Contains a macro for defining runtime modules and generating values representing lazy module function calls.

error

Macro for declaring a module error.

event

Macros that define an Event types. Events can be used to easily report changes or conditions in your runtime to external entities like users, chain explorers, or dApps.

inherent

instances

Some instance placeholder to be used in frame_support::pallet attribute macro.

migrations

pallet_prelude

Prelude to be used alongside pallet macro, for ease of use.

storage

Stuff to do with the runtime’s storage.

traits

Traits and associated utilities for use in the FRAME environment.

weights

Primitives for transaction weighting.

Macros

assert_err

Assert an expression returns an error specified.

assert_err_ignore_postinfo

Assert an expression returns an error specified.

assert_err_with_weight

Assert an expression returns error with the given weight.

assert_noop

Evaluate an expression, assert it returns an expected Err value and that runtime storage has not been mutated (i.e. expression is a no-operation).

assert_ok

Panic if an expression doesn’t evaluate to Ok.

assert_storage_noop

Evaluate any expression and assert that runtime storage has not been mutated (i.e. expression is a storage no-operation).

construct_runtime

Construct a runtime, with the given name and the given pallets.

decl_error

Declare an error type for a runtime module.

decl_event

Implement the Event for a module.

decl_module

Declares a Module struct and a Call enum, which implements the dispatch logic.

decl_storage

Declares strongly-typed wrappers around codec-compatible types in storage.

ensure

Evaluate $x:expr and if not true return Err($y:expr).

fail

Return Err of the expression: return Err($expression);.

generate_storage_alias

Generate a new type alias for storage::types::StorageValue, storage::types::StorageMap, storage::types::StorageDoubleMap and storage::types::StorageNMap.

impl_filter_stack

match_type

Create a type which implements the Contains trait for a particular type with syntax similar to matches!.

ord_parameter_types

Macro for easily creating a new implementation of both the Get and Contains traits. Use exactly as with parameter_types, only the type must be Ord.

parameter_types

Create new implementations of the Get trait.

parameter_types_impl_thread_local

runtime_print

Print out a formatted message.

Structs

Blake2_128

Hash storage keys with blake2 128

Blake2_128Concat

Hash storage keys with concat(blake2_128(key), key)

Blake2_256

Hash storage keys with blake2 256

Identity

Store the key directly.

PalletId

A pallet identifier. These are per pallet and should be stored in a registry somewhere.

Twox64Concat

Hash storage keys with concat(twox64(key), key)

Twox128

Hash storage keys with twox 128

Twox256

Hash storage keys with twox 256

Enums

Never

A type that cannot be instantiated.

Void

The void type - it cannot exist.

Constants

LOG_TARGET

A unified log target for support operations.

Traits

Hashable

Printable

Trait for things which can be printed from the runtime.

ReversibleStorageHasher

Hasher to use to hash keys to insert to storage.

StorageHasher

Hasher to use to hash keys to insert to storage.

Functions

debug

Print out the debuggable type.

print

Print something that implements Printable from the runtime.

Type Definitions

ConsensusEngineId

Consensus engine unique ID.

Attribute Macros

pallet

pallet attribute macro allows to define a pallet to be used in construct_runtime!.

require_transactional

Assert the annotated function is executed within a storage transaction.

transactional

Execute the annotated function in a new storage transaction.

Derive Macros

CloneNoBound

Derive Clone but do not bound any generic.

DebugNoBound

Derive Debug but do not bound any generic.

DefaultNoBound

Derive Default but do not bound any generic.

EqNoBound

Derive Eq but do not bound any generic.

PartialEqNoBound

Derive PartialEq but do not bound any generic.

RuntimeDebugNoBound

Derive Debug, if std is enabled it uses frame_support::DebugNoBound, if std is not enabled it just returns "<stripped>". This behaviour is useful to prevent bloating the runtime WASM blob from unneeded code.