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>
* replace Index by Nonce
* replace Index by Nonce
* replace Index by Nonce
* replace Index by Nonce
* replace Index by Nonce
* wip
* remove index in lieu of nonce
* wip
* remove accountnonce in lieu of nonce
* add minor improvement
* rebase and merge conflicts
* frame: GenesisBuild::build allowed in no_std
i`GenesisBuild::build` function will be required for no_std in no native
runtime world.
`GenesisBuild::build` macro generated function allows to build the runtime
GenesisConfig assembled from all pallets' GenesisConfigs.
* fixes
* GenesisBuild::build avaiable in no-std
- #[cfg(feature = "std")] is not longer added to GenesisBuild implementation.
* system: hash69 available for no-std
* elections-phragmen: panic message fixed for no_std
* frame::suport: doc updated
* test-runtime: default for GenesisConfig
* frame::test-pallet: serde/std added to std feature deps
* Cargo.toml: deps sorted
* Cargo.lock update
cargo update -p frame-support-test-pallet -p frame-support-test
* frame ui tests: cleanup
---------
Co-authored-by: parity-processbot <>
* Initial changes
* Adds UI test for error when _ is used without dev_mode
* Minor
* ".git/.scripts/commands/fmt/fmt.sh"
* Adds test to verify hasher
---------
Co-authored-by: command-bot <>
* stub for construct_dev_runtime!
* revert
* stub for dev_mode proc macro
* preliminary docs for pallet::dev_mode (attribute) proc macro
* add dev_mode to pallet_macros module
* add docs item for dev_mode to frame_support
* parsing of #[pallet(dev_mode)]
* strip out dev_mode stub since it will be an arg for pallet instead
* make pallet Def struct aware of dev mode
* WIP
* revert changes to call.rs
* pass dev_mode to pallet parsing code
* auto-specify default weights when in dev mode if not specified
* add proof / expect for syn::parse in dev mode weight processing
* set all storages to unbounded when in dev mode
* just use 0
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* add invalid pallet arg test
* add passing dev mode pallet test
* add test confirming that dev mode features only work in dev mode
* cargo fmt + clean up
* bump CI
* fix pallet ui test
* add docs for dev mode
* add warning about using dev mode in production circumstances
* remove comment about no other attributes being supported
* fix unneeded assignment
* make warning more explicit
* more explicit warning about using dev mode in production
* simpler assignment for dev_mode boolean
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* add note about MEL requirement
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* add comment specifying why weights can be omitted in example
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* tweak wording of comments
* bump ci
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* Allow pallet errors to contain at most one field
* Update docs on pallet::error
* Reword documentation
* cargo fmt
* Introduce CompactPalletError trait and require #[pallet::error] fields to implement them
* cargo fmt
* Do not assume tuple variants
* Add CompactPalletError derive macro
* Check for error type compactness in construct_runtime
* cargo fmt
* Derive CompactPalletError instead of implementing it directly during macro expansion
* Implement CompactPalletError on OptionBool instead of Option<bool>
* Check for type idents instead of variant ident
* Add doc comments for ErrorCompactnessTest
* Add an trait implementation of ErrorCompactnessTest for ()
* Convert the error field of DispatchError to a 4-element byte array
* Add static check for pallet error size
* Rename to MAX_PALLET_ERROR_ENCODED_SIZE
* Remove ErrorCompactnessTest trait
* Remove check_compactness
* Return only the most significant byte when constructing a custom InvalidTransaction
* Rename CompactPalletError to PalletError
* Use counter to generate unique idents for assert macros
* Make declarative pallet macros compile with pallet error size checks
* Remove unused doc comment
* Try and fix build errors
* Fix build errors
* Add macro_use for some test modules
* Test fix
* Fix compilation errors
* Remove unneeded #[macro_use]
* Resolve import ambiguity
* Make path to pallet Error enum more specific
* Fix test expectation
* Disambiguate imports
* Fix test expectations
* Revert appending pallet module name to path
* Rename bags_list::list::Error to BagError
* Fixes
* Fixes
* Fixes
* Fix test expectations
* Fix test expectation
* Add more implementations for PalletError
* Lift the 1-field requirement for nested pallet errors
* Fix UI test expectation
* Remove PalletError impl for OptionBool
* Use saturating operations
* cargo fmt
* Delete obsolete test
* Fix test expectation
* Try and use assert macro in const context
* Pull out the pallet error size check macro
* Fix UI test for const assertion
* cargo fmt
* Apply clippy suggestion
* Fix doc comment
* Docs for create_tt_return_macro
* Ensure TryInto is imported in earlier Rust editions
* Apply suggestions from code review
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
* Fix up comments and names
* Implement PalletError for Never
* cargo fmt
* Don't compile example code
* Bump API version for block builder
* Factor in codec attributes while derving PalletError
* Rename module and fix unit test
* Add missing attribute
* Check API version and convert ApplyExtrinsicResult accordingly
* Rename BagError to ListError
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* Use codec crate re-exported from frame support
* Add links to types mentioned in doc comments
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
* cargo fmt
* cargo fmt
* Re-add attribute for hidden docs
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* Allow additional trait bounds for constants
* Add ui test for constants with additional trait bounds
* Update trait constant ui test
* Import syn::Error
* Use reference instead of cloning
* Add extra invalid bound ui test
* Out or order valid bounds
* Fix ui test
* Fix ui test
* Apply review suggestion about error message
Sam Johnson