Struct frame_system::CheckNonce

pub struct CheckNonce<T: Config>(_);

Nonce check and increment to give replay protection for transactions.

Note that this does not set any priority by default. Make sure that AT LEAST one of the signed extension sets some kind of priority upon validating transactions.

Implementations

impl<T: Config> CheckNonce<T>

pub fn from(nonce: T::Index) -> Self

utility constructor. Used only in client/factory code.

Trait Implementations

impl<T: Clone + Config> Clone for CheckNonce<T> where
    T::Index: Clone, 

fn clone(&self) -> CheckNonce<T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Config> Debug for CheckNonce<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: Config> Decode for CheckNonce<T> where
    T::Index: HasCompact, 

fn decode<__CodecInputEdqy: Input>(
    __codec_input_edqy: &mut __CodecInputEdqy
) -> Result<Self, Error>

Attempt to deserialise the value from input.

fn skip<I>(input: &mut I) -> Result<(), Error> where
    I: Input, 

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl<T: Config> Encode for CheckNonce<T> where
    T::Index: HasCompact, 

fn encode_to<__CodecOutputEdqy: Output + ?Sized>(
    &self,
    __codec_dest_edqy: &mut __CodecOutputEdqy
)

Convert self to a slice and append it to the destination.

fn encode(&self) -> Vec<u8>

Convert self to an owned vector.

fn using_encoded<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R

Convert self to a slice and then invoke the given closure with it.

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl<T: PartialEq + Config> PartialEq<CheckNonce<T>> for CheckNonce<T> where
    T::Index: PartialEq, 

fn eq(&self, other: &CheckNonce<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &CheckNonce<T>) -> bool

This method tests for !=.

impl<T: Config> SignedExtension for CheckNonce<T> where
    T::Call: Dispatchable<Info = DispatchInfo>, 

type AccountId = T::AccountId

The type which encodes the sender identity.

type Call = T::Call

The type which encodes the call to be dispatched.

type AdditionalSigned = ()

Any additional data that will go into the signed payload. This may be created dynamically from the transaction using the additional_signed function.

type Pre = ()

The type that encodes information that can be passed from pre_dispatch to post-dispatch.

const IDENTIFIER: &'static str

Unique identifier of this signed extension.

fn additional_signed(&self) -> Result<(), TransactionValidityError>

Construct any additional data that should be in the signed payload of the transaction. Can also perform any pre-signature-verification checks and return an error if needed.

fn pre_dispatch(
    self,
    who: &Self::AccountId,
    _call: &Self::Call,
    _info: &DispatchInfoOf<Self::Call>,
    _len: usize
) -> Result<(), TransactionValidityError>

Do any pre-flight stuff for a signed transaction.

fn validate(
    &self,
    who: &Self::AccountId,
    _call: &Self::Call,
    _info: &DispatchInfoOf<Self::Call>,
    _len: usize
) -> TransactionValidity

Validate a signed transaction for the transaction queue.

fn validate_unsigned(
    _call: &Self::Call,
    _info: &<Self::Call as Dispatchable>::Info,
    _len: usize
) -> Result<ValidTransaction, TransactionValidityError>

Validate an unsigned transaction for the transaction queue.

fn pre_dispatch_unsigned(
    call: &Self::Call,
    info: &<Self::Call as Dispatchable>::Info,
    len: usize
) -> Result<Self::Pre, TransactionValidityError>

Do any pre-flight stuff for a unsigned transaction.

fn post_dispatch(
    _pre: Self::Pre,
    _info: &<Self::Call as Dispatchable>::Info,
    _post_info: &<Self::Call as Dispatchable>::PostInfo,
    _len: usize,
    _result: &Result<(), DispatchError>
) -> Result<(), TransactionValidityError>

Do any post-flight stuff for an extrinsic.

fn identifier() -> Vec<&'static str, Global>

Returns the list of unique identifier for this signed extension.

impl<T: Config> EncodeLike<CheckNonce<T>> for CheckNonce<T> where
    T::Index: HasCompact, 

impl<T: Eq + Config> Eq for CheckNonce<T> where
    T::Index: Eq, 

impl<T: Config> StructuralEq for CheckNonce<T>

impl<T: Config> StructuralPartialEq for CheckNonce<T>