Module traits

Primitives for the runtime modules.

Re-exports

pub use transaction_extension::DispatchTransaction;

pub use transaction_extension::Implication;

pub use transaction_extension::ImplicationParts;

pub use transaction_extension::TransactionExtension;

pub use transaction_extension::TransactionExtensionMetadata;

pub use transaction_extension::TxBaseImplication;

pub use transaction_extension::ValidateResult;

Modules

transaction_extension

The transaction extension trait.

Structs

AccountIdLookup

A lookup implementation returning the AccountId from a MultiAddress.

AppendZerosInput

Input that adds infinite number of zero after wrapped input.

BadOrigin

An error type that indicates that the origin is invalid.

BlakeTwo256

Blake2-256 Hash implementation.

CheckedReduceBy

A TryMorph implementation to reduce a scalar by a particular amount, checking for underflow.

ConvertInto

A structure that performs standard conversion using the standard Rust conversion traits.

ConvertToValue

Adapter which turns a Get implementation into a Convert implementation which always returns in the same value no matter the input.

FakeDispatchable

Dispatchable impl containing an arbitrary value which panics if it actually is dispatched.

Identity

A structure that performs identity conversion.

IdentityLookup

A lookup implementation returning the input value.

Keccak256

Keccak-256 Hash implementation.

LookupError

An error that indicates that a lookup failed.

MorphInto

Implementation of Morph which converts between types using Into.

MorphWithUpperLimit

A TryMorph implementation to enforce an upper limit for a result of the outer morphed type.

ReduceBy

Mutator which reduces a scalar by a particular amount.

Replace

Morpher to disregard the source value and replace with another.

ReplaceWithDefault

Morpher to disregard the source value and replace with the default of V.

TakeFirst

Implementation of Morph to retrieve just the first element of a tuple.

TrailingZeroInput

Input that adds infinite number of zero after wrapped input.

TryConvertInto

A structure that performs standard conversion using the standard Rust conversion traits.

TryMorphInto

Implementation of TryMorph which attempts to convert between types using TryInto.

Traits

AccountIdConversion

This type can be converted into and possibly from an AccountId (which itself is generic).

AppVerify

Means of signature verification of an application key.

Applyable

An “executable” piece of information, used by the standard Substrate Executive in order to enact a piece of extrinsic information by marshalling and dispatching to a named function call.

AsSystemOriginSigner

Runtime Origin which includes a System Origin variant whose AccountId is the parameter.

AsTransactionAuthorizedOrigin

Interface to differentiate between Runtime Origins authorized to include a transaction into the block and dispatch it, and those who aren’t.

AtLeast32Bit

A meta trait for arithmetic.

AtLeast32BitUnsigned

A meta trait for arithmetic. Same as AtLeast32Bit, but also bounded to be unsigned.

BlindCheckable

A “checkable” piece of information, used by the standard Substrate Executive in order to check the validity of a piece of extrinsic information, usually by verifying the signature. Implement for pieces of information that don’t require additional context in order to be checked.

Block

Something which fulfills the abstract idea of a Substrate block. It has types for Extrinsic pieces of information as well as a Header.

BlockIdTo

Something that can convert a BlockId to a number or a hash.

BlockNumber

Super trait with all the attributes for a block number.

BlockNumberProvider

Get current block number

Bounded

Numbers which have upper and lower bounds

CheckEqual

Something that can be checked for equality and printed out to a debug channel if bad.

Checkable

Extract the digest type for a block. A “checkable” piece of information, used by the standard Substrate Executive in order to check the validity of a piece of extrinsic information, usually by verifying the signature. Implement for pieces of information that require some additional context Context in order to be checked.

CheckedAdd

Performs addition that returns None instead of wrapping around on overflow.

CheckedConversion

Convenience type to work around the highly unergonomic syntax needed to invoke the functions of overloaded generic traits, in this case TryFrom and TryInto.

CheckedDiv

Performs division that returns None instead of panicking on division by zero and instead of wrapping around on underflow and overflow.

CheckedMul

Performs multiplication that returns None instead of wrapping around on underflow or overflow.

CheckedShl

Performs a left shift that returns None on shifts larger than or equal to the type width.

CheckedShr

Performs a right shift that returns None on shifts larger than or equal to the type width.

CheckedSub

Performs subtraction that returns None instead of wrapping around on underflow.

Clear

Trait for things that can be clear (have no bits set). For numeric types, essentially the same as Zero.

Convert

Infallible conversion trait. Generic over both source and destination types.

ConvertBack

Reversing infallible conversion trait. Generic over both source and destination types.

Dispatchable

A lazy call (module function and argument values) that can be executed via its dispatch method.

Ensure

EnsureAdd

Performs addition that returns ArithmeticError instead of wrapping around on overflow.

EnsureAddAssign

Performs self addition that returns ArithmeticError instead of wrapping around on overflow.

EnsureDiv

Performs division that returns ArithmeticError instead of wrapping around on overflow.

EnsureDivAssign

Performs self division that returns ArithmeticError instead of wrapping around on overflow.

EnsureFixedPointNumber

Extends FixedPointNumber with the Ensure family functions.

EnsureFrom

Similar to TryFrom but returning an ArithmeticError error.

EnsureInto

Similar to TryInto but returning an ArithmeticError error.

EnsureMul

Performs multiplication that returns ArithmeticError instead of wrapping around on overflow.

EnsureMulAssign

Performs self multiplication that returns ArithmeticError instead of wrapping around on overflow.

EnsureOp

Meta trait that supports all immutable arithmetic Ensure* operations

EnsureOpAssign

Meta trait that supports all assigned arithmetic Ensure* operations

EnsureSub

Performs subtraction that returns ArithmeticError instead of wrapping around on underflow.

EnsureSubAssign

Performs self subtraction that returns ArithmeticError instead of wrapping around on underflow.

ExtensionPostDispatchWeightHandler

A type that can handle weight refunds and incorporate extension weights into the call weight after dispatch.

ExtrinsicDeprecated

Something that acts like an Extrinsic.

ExtrinsicLike

Something that acts like an Extrinsic.

ExtrinsicMetadata

Implementor is an Extrinsic and provides metadata about this extrinsic.

GetNodeBlockType

A marker trait for something that knows the type of the node block.

GetRuntimeBlockType

A marker trait for something that knows the type of the runtime block.

Hash

Abstraction around hashing

HashOutput

Super trait with all the attributes for a hashing output.

Header

Something which fulfills the abstract idea of a Substrate header. It has types for a Number, a Hash and a Hashing. It provides access to an extrinsics_root, state_root and parent_hash, as well as a digest and a block number.

IdentifyAccount

Some type that is able to be collapsed into an account ID. It is not possible to recreate the original value from the account ID.

IntegerSquareRoot

A trait implementing integer square root.

IsMember

Determine if a MemberId is a valid member.

Lazy

A lazy value.

Lookup

Means of changing one type into another in a manner dependent on the source type.

MaybeConvert

Fallible conversion trait returning an Option. Generic over both source and destination types.

MaybeConvertBack

Reversing fallible conversion trait returning an Option. Generic over both source and destination types.

MaybeDisplay

A type that implements Display when in std environment.

MaybeEquivalence

Definition for a bi-directional, fallible conversion between two types.

MaybeFromStr

A type that implements FromStr when in std environment.

MaybeHash

A type that implements Hash when in std environment.

MaybeSerialize

A type that implements Serialize when in std environment or serde feature is activated.

MaybeSerializeDeserialize

A type that implements Serialize, DeserializeOwned and Debug when in std environment or serde feature is activated.

Member

A type that can be used in runtime structures.

Morph

Extensible conversion trait. Generic over only source type, with destination type being associated.

One

Defines a multiplicative identity element for Self.

OpaqueKeys

Opaque data type that may be destructured into a series of raw byte slices (which represent individual keys).

Printable

Trait for things which can be printed from the runtime.

RefundWeight

A type that can handle weight refunds.

SaturatedConversion

Convenience type to work around the highly unergonomic syntax needed to invoke the functions of overloaded generic traits, in this case SaturatedFrom and SaturatedInto.

Saturating

Saturating arithmetic operations, returning maximum or minimum values instead of overflowing.

Scale

Multiply and divide by a number that isn’t necessarily the same type. Basically just the same as Mul and Div except it can be used for all basic numeric types.

SignaturePayload

Something that acts like a SignaturePayload of an Extrinsic.

SignedExtensionDeprecated

Means by which a transaction may be extended. This type embodies both the data and the logic that should be additionally associated with the transaction. It should be plain old data.

SimpleBitOps

A meta trait for all bit ops.

StaticLookup

Means of changing one type into another in a manner dependent on the source type. This variant is different to Lookup in that it doesn’t (can cannot) require any context.

TryConvert

Fallible conversion trait which returns the argument in the case of being unable to convert. Generic over both source and destination types.

TryConvertBack

Reversing fallible conversion trait which returns the argument in the case of being unable to convert back. Generic over both source and destination types.

TryMorph

Extensible conversion trait. Generic over only source type, with destination type being associated.

UniqueSaturatedFrom

Just like From except that if the source value is too big to fit into the destination type then it’ll saturate the destination.

UniqueSaturatedInto

Just like Into except that if the source value is too big to fit into the destination type then it’ll saturate the destination.

ValidateUnsigned

Provide validation for unsigned extrinsics.

Verify

Means of signature verification.

Zero

Defines an additive identity element for Self.

Functions

checked_pow

Raises a value to the power of exp, returning None if an overflow occurred.

ensure_pow

Raises a value to the power of exp, returning ArithmeticError if an overflow occurred.

Type Aliases

DispatchInfoOf

Shortcut to reference the Info type of a Dispatchable.

DispatchOriginOf

Shortcut to reference the RuntimeOrigin type of a Dispatchable.

HashingFor

Extract the hashing type for a block.

NumberFor

Extract the number type for a block.

PostDispatchInfoOf

Shortcut to reference the PostInfo type of a Dispatchable.