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lib.rs
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lib.rs
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#![cfg_attr(not(feature = "std"), no_std)]
pub use pallet::*;
#[cfg(test)]
mod mock;
#[cfg(test)]
mod tests;
#[cfg(feature = "runtime-benchmarks")]
mod benchmarking;
#[frame_support::pallet]
pub mod pallet {
use frame_support::pallet_prelude::*;
use frame_system::pallet_prelude::*;
#[pallet::pallet]
#[pallet::generate_store(pub(super) trait Store)]
pub struct Pallet<T>(_);
#[pallet::config]
pub trait Config: frame_system::Config {
type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
}
#[pallet::storage]
#[pallet::getter(fn something)]
pub type Something<T> = StorageValue<_, u32>;
#[pallet::event]
#[pallet::generate_deposit(pub(super) fn deposit_event)]
pub enum Event<T: Config> {
SomethingStored { something: u32, who: T::AccountId },
}
#[pallet::error]
pub enum Error<T> {
NoneValue,
StorageOverflow,
}
#[pallet::call]
impl<T: Config> Pallet<T> {
#[pallet::call_index(0)]
#[pallet::weight(10_000 + T::DbWeight::get().writes(1).ref_time())]
pub fn do_something(origin: OriginFor<T>, something: u32) -> DispatchResult {
// Check that the extrinsic was signed and get the signer.
// This function will return an error if the extrinsic is not signed.
// https://docs.substrate.io/main-docs/build/origins/
let who = ensure_signed(origin)?;
// Update storage.
<Something<T>>::put(something);
// Emit an event.
Self::deposit_event(Event::SomethingStored { something, who });
// Return a successful DispatchResultWithPostInfo
Ok(())
}
/// An example dispatchable that may throw a custom error.
#[pallet::call_index(1)]
#[pallet::weight(10_000 + T::DbWeight::get().reads_writes(1,1).ref_time())]
pub fn cause_error(origin: OriginFor<T>) -> DispatchResult {
let _who = ensure_signed(origin)?;
// Read a value from storage.
match <Something<T>>::get() {
// Return an error if the value has not been set.
None => return Err(Error::<T>::NoneValue.into()),
Some(old) => {
// Increment the value read from storage; will error in the event of overflow.
let new = old.checked_add(1).ok_or(Error::<T>::StorageOverflow)?;
// Update the value in storage with the incremented result.
<Something<T>>::put(new);
Ok(())
},
}
}
}
}