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gupnik
60c77a2e9a
Fixes https://github.com/paritytech/polkadot-sdk/issues/1725 This PR adds the following changes: 1. An attribute `pallet::feeless_if` that can be optionally attached to a call like so: ```rust #[pallet::feeless_if(|_origin: &OriginFor<T>, something: &u32| -> bool { *something == 0 })] pub fn do_something(origin: OriginFor<T>, something: u32) -> DispatchResult { .... } ``` The closure passed accepts references to arguments as specified in the call fn. It returns a boolean that denotes the conditions required for this call to be "feeless". 2. A signed extension `SkipCheckIfFeeless<T: SignedExtension>` that wraps a transaction payment processor such as `pallet_transaction_payment::ChargeTransactionPayment`. It checks for all calls annotated with `pallet::feeless_if` to see if the conditions are met. If so, the wrapped signed extension is not called, essentially making the call feeless. In order to use this, you can simply replace your existing signed extension that manages transaction payment like so: ```diff - pallet_transaction_payment::ChargeTransactionPayment<Runtime>, + pallet_skip_feeless_payment::SkipCheckIfFeeless< + Runtime, + pallet_transaction_payment::ChargeTransactionPayment<Runtime>, + >, ``` ### Todo - [x] Tests - [x] Docs - [x] Prdoc --------- Co-authored-by: Nikhil Gupta <> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com> Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
31 lines
801 B
Plaintext
31 lines
801 B
Plaintext
title: Adds syntax for marking calls feeless
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doc:
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- audience: Core Dev
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description: |
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1. Adds an attribute `#[pallet::feeless_if]` that can be optionally attached to a `pallet::call`.
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2. Adds a signed extension SkipCheckIfFeeless<T: SignedExtension> that wraps a transaction
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payment processor to potentially skip payment fees for such calls.
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Note that both the attribute and the signed extension are needed to make the call feeless.
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migrations:
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db: []
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runtime: []
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crates:
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- name: "frame-support-procedural"
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semver: minor
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- name: "pallet-skip-feeless-payment"
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semver: major
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- pallet-example-kitchensink
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semver: patch
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- kitchensink-runtime
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semver: major
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- node-testing
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semver: patch
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- node-cli
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semver: patch
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host_functions: []
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