Sam Johnson
ac3f14d23b
`polkadot-sdk` version of original tasks PR located here: https://github.com/paritytech/substrate/pull/14329 Fixes #206 ## Status - [x] Generic `Task` trait - [x] `RuntimeTask` aggregated enum, compatible with `construct_runtime!` - [x] Casting between `Task` and `RuntimeTask` without needing `dyn` or `Box` - [x] Tasks Example pallet - [x] Runtime tests for Tasks example pallet - [x] Parsing for task-related macros - [x] Retrofit parsing to make macros optional - [x] Expansion for task-related macros - [x] Adds support for args in tasks - [x] Retrofit tasks example pallet to use macros instead of manual syntax - [x] Weights - [x] Cleanup - [x] UI tests - [x] Docs ## Target Syntax Adapted from https://github.com/paritytech/polkadot-sdk/issues/206#issue-1865172283 ```rust // NOTE: this enum is optional and is auto-generated by the other macros if not present #[pallet::task] pub enum Task<T: Config> { AddNumberIntoTotal { i: u32, } } /// Some running total. #[pallet::storage] pub(super) type Total<T: Config<I>, I: 'static = ()> = StorageValue<_, (u32, u32), ValueQuery>; /// Numbers to be added into the total. #[pallet::storage] pub(super) type Numbers<T: Config<I>, I: 'static = ()> = StorageMap<_, Twox64Concat, u32, u32, OptionQuery>; #[pallet::tasks_experimental] impl<T: Config<I>, I: 'static> Pallet<T, I> { /// Add a pair of numbers into the totals and remove them. #[pallet::task_list(Numbers::<T, I>::iter_keys())] #[pallet::task_condition(|i| Numbers::<T, I>::contains_key(i))] #[pallet::task_index(0)] pub fn add_number_into_total(i: u32) -> DispatchResult { let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?; Total::<T, I>::mutate(|(total_keys, total_values)| { *total_keys += i; *total_values += v; }); Ok(()) } } ``` --------- Co-authored-by: Nikhil Gupta <17176722+gupnik@users.noreply.github.com> Co-authored-by: kianenigma <kian@parity.io> Co-authored-by: Nikhil Gupta <> Co-authored-by: Gavin Wood <gavin@parity.io> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: gupnik <nikhilgupta.iitk@gmail.com>
System Module
The System module provides low-level access to core types and cross-cutting utilities. It acts as the base layer for other pallets to interact with the Substrate framework components.
Overview
The System module defines the core data types used in a Substrate runtime. It also provides several utility functions
(see Pallet) for other FRAME pallets.
In addition, it manages the storage items for extrinsics data, indexes, event records, and digest items, among other things that support the execution of the current block.
It also handles low-level tasks like depositing logs, basic set up and take down of temporary storage entries, and access to previous block hashes.
Interface
Dispatchable Functions
The System module does not implement any dispatchable functions.
Public Functions
See the Pallet struct for details of
publicly available functions.
Signed Extensions
The System module defines the following extensions:
- [
CheckWeight]: Checks the weight and length of the block and ensure that it does not exceed the limits. - [
CheckNonce]: Checks the nonce of the transaction. Contains a single payload of typeT::Nonce. - [
CheckEra]: Checks the era of the transaction. Contains a single payload of typeEra. - [
CheckGenesis]: Checks the provided genesis hash of the transaction. Must be a part of the signed payload of the transaction. - [
CheckSpecVersion]: Checks that the runtime version is the same as the one used to sign the transaction. - [
CheckTxVersion]: Checks that the transaction version is the same as the one used to sign the transaction.
Lookup the runtime aggregator file (e.g. node/runtime) to see the full list of signed extensions included in a chain.
Usage
Prerequisites
Import the System module and derive your module's configuration trait from the system trait.
Example - Get extrinsic count and parent hash for the current block
#[frame_support::pallet]
pub mod pallet {
use super::*;
use frame_support::pallet_prelude::*;
use frame_system::pallet_prelude::*;
#[pallet::config]
pub trait Config: frame_system::Config {}
#[pallet::pallet]
pub struct Pallet<T>(_);
#[pallet::call]
impl<T: Config> Pallet<T> {
#[pallet::weight(0)]
pub fn system_module_example(origin: OriginFor<T>) -> DispatchResult {
let _sender = ensure_signed(origin)?;
let _extrinsic_count = <system::Pallet<T>>::extrinsic_count();
let _parent_hash = <system::Pallet<T>>::parent_hash();
Ok(())
}
}
}
License: Apache-2.0