Trait polkadot_sdk_frame::traits::SignedExtension

pub trait SignedExtension: Codec + Debug + Sync + Send + Clone + Eq + PartialEq + StaticTypeInfo {
    type AccountId;
    type Call: Dispatchable;
    type AdditionalSigned: Codec + TypeInfo;
    type Pre;

    const IDENTIFIER: &'static str;

    // Required methods
    fn additional_signed(
        &self,
    ) -> Result<Self::AdditionalSigned, TransactionValidityError>;
    fn pre_dispatch(
        self,
        who: &Self::AccountId,
        call: &Self::Call,
        info: &<Self::Call as Dispatchable>::Info,
        len: usize,
    ) -> Result<Self::Pre, TransactionValidityError>;

    // Provided methods
    fn validate(
        &self,
        _who: &Self::AccountId,
        _call: &Self::Call,
        _info: &<Self::Call as Dispatchable>::Info,
        _len: usize,
    ) -> Result<ValidTransaction, TransactionValidityError> { ... }
    fn post_dispatch(
        _pre: Option<Self::Pre>,
        _info: &<Self::Call as Dispatchable>::Info,
        _post_info: &<Self::Call as Dispatchable>::PostInfo,
        _len: usize,
        _result: &Result<(), DispatchError>,
    ) -> Result<(), TransactionValidityError> { ... }
    fn metadata() -> Vec<TransactionExtensionMetadata> { ... }
    fn validate_unsigned(
        _call: &Self::Call,
        _info: &<Self::Call as Dispatchable>::Info,
        _len: usize,
    ) -> Result<ValidTransaction, TransactionValidityError> { ... }
    fn pre_dispatch_unsigned(
        call: &Self::Call,
        info: &<Self::Call as Dispatchable>::Info,
        len: usize,
    ) -> Result<(), TransactionValidityError> { ... }
}

👎Deprecated: Use TransactionExtension instead.

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.

Required Associated Types

type AccountId

👎Deprecated: Use TransactionExtension instead.

The type which encodes the sender identity.

type Call: Dispatchable

👎Deprecated: Use TransactionExtension instead.

The type which encodes the call to be dispatched.

type AdditionalSigned: Codec + TypeInfo

👎Deprecated: Use TransactionExtension instead.

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

👎Deprecated: Use TransactionExtension instead.

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

Required Associated Constants

const IDENTIFIER: &'static str

👎Deprecated: Use TransactionExtension instead.

Unique identifier of this signed extension.

This will be exposed in the metadata to identify the signed extension used in an extrinsic.

Required Methods

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

👎Deprecated: Use TransactionExtension instead.

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: &<Self::Call as Dispatchable>::Info, len: usize, ) -> Result<Self::Pre, TransactionValidityError>

👎Deprecated: Use TransactionExtension instead.

Do any pre-flight stuff for a signed transaction.

Make sure to perform the same checks as in Self::validate.

Provided Methods

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

👎Deprecated: Use TransactionExtension instead.

Validate a signed transaction for the transaction queue.

This function can be called frequently by the transaction queue, to obtain transaction validity against current state. It should perform all checks that determine a valid transaction, that can pay for its execution and quickly eliminate ones that are stale or incorrect.

Make sure to perform the same checks in pre_dispatch function.

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

👎Deprecated: Use TransactionExtension instead.

Do any post-flight stuff for an extrinsic.

If the transaction is signed, then _pre will contain the output of pre_dispatch, and None otherwise.

This gets given the DispatchResult _result from the extrinsic and can, if desired, introduce a TransactionValidityError, causing the block to become invalid for including it.

WARNING: It is dangerous to return an error here. To do so will fundamentally invalidate the transaction and any block that it is included in, causing the block author to not be compensated for their work in validating the transaction or producing the block so far.

It can only be used safely when you know that the extrinsic is one that can only be introduced by the current block author; generally this implies that it is an inherent and will come from either an offchain-worker or via InherentData.

fn metadata() -> Vec<TransactionExtensionMetadata>

👎Deprecated: Use TransactionExtension instead.

Returns the metadata for this signed extension.

As a SignedExtension can be a tuple of SignedExtensions we need to return a Vec that holds the metadata of each one. Each individual SignedExtension must return exactly one TransactionExtensionMetadata.

This method provides a default implementation that returns a vec containing a single TransactionExtensionMetadata.

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

👎Deprecated: Use TransactionExtension instead.

Validate an unsigned transaction for the transaction queue.

This function can be called frequently by the transaction queue to obtain transaction validity against current state. It should perform all checks that determine a valid unsigned transaction, and quickly eliminate ones that are stale or incorrect.

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

👎Deprecated: Use TransactionExtension instead.

Do any pre-flight stuff for an unsigned transaction.

Note this function by default delegates to validate_unsigned, so that all checks performed for the transaction queue are also performed during the dispatch phase (applying the extrinsic).

If you ever override this function, you need not perform the same validation as in validate_unsigned.

Object Safety

This trait is not object safe.

Implementors