Struct pallet_template::pallet::Pallet

pub struct Pallet<T>(/* private fields */);

The Pallet struct, the main type that implements traits and standalone functions within the pallet.

Implementations

impl<T: Config> Pallet<T>

The pallet’s dispatchable functions (Calls).

Dispatchable functions allows users to interact with the pallet and invoke state changes. These functions materialize as “extrinsics”, which are often compared to transactions. They must always return a DispatchResult and be annotated with a weight and call index.

The call_index macro is used to explicitly define an index for calls in the Call enum. This is useful for pallets that may introduce new dispatchables over time. If the order of a dispatchable changes, its index will also change which will break backwards compatibility.

The weight macro is used to assign a weight to each call.

pub fn do_something(origin: OriginFor<T>, something: u32) -> DispatchResult

An example dispatchable that takes a single u32 value as a parameter, writes the value to storage and emits an event.

It checks that the origin for this call is Signed and returns a dispatch error if it isn’t. Learn more about origins here: https://docs.substrate.io/build/origins/

pub fn cause_error(origin: OriginFor<T>) -> DispatchResult

An example dispatchable that may throw a custom error.

It checks that the caller is a signed origin and reads the current value from the Something storage item. If a current value exists, it is incremented by 1 and then written back to storage.

Errors

The function will return an error under the following conditions:

• If no value has been set (Error::NoneValue)
• If incrementing the value in storage causes an arithmetic overflow (Error::StorageOverflow)

Trait Implementations

impl<T: Config> BeforeAllRuntimeMigrations for Pallet<T>

fn before_all_runtime_migrations() -> Weight

Something that should happen before runtime migrations are executed.

impl<T> Benchmarking for Pallet<T>

where T: Config + Config,

fn benchmarks(extra: bool) -> Vec<BenchmarkMetadata>

Get the benchmarks available for this pallet. Generally there is one benchmark per extrinsic, so these are sometimes just called “extrinsics”.

fn run_benchmark( extrinsic: &[u8], c: &[(BenchmarkParameter, u32)], whitelist: &[TrackedStorageKey], verify: bool, internal_repeats: u32, ) -> Result<Vec<BenchmarkResult>, BenchmarkError>

Run the benchmarks for this pallet.

impl<T: Config> Callable<T> for Pallet<T>

type RuntimeCall = Call<T>

impl<T> Clone for Pallet<T>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for Pallet<T>

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: Config> GetStorageVersion for Pallet<T>

type InCodeStorageVersion = NoStorageVersionSet

This type is generated by the pallet macro.

fn in_code_storage_version() -> Self::InCodeStorageVersion

Returns the in-code storage version as specified in the storage_version attribute, or [NoStorageVersionSet] if the attribute is missing.

fn on_chain_storage_version() -> StorageVersion

Returns the storage version of the pallet as last set in the actual on-chain storage.

fn current_storage_version() -> Self::InCodeStorageVersion

👎Deprecated: This method has been renamed to in_code_storage_version and will be removed after March 2024.

DEPRECATED: Use [Self::current_storage_version] instead.

impl<T: Config> Hooks<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn on_initialize(_n: BlockNumber) -> Weight

Block initialization hook. This is called at the very beginning of block execution.

fn on_finalize(_n: BlockNumber)

Block finalization hook. This is called at the very end of block execution.

fn on_idle(_n: BlockNumber, _remaining_weight: Weight) -> Weight

Hook to consume a block’s idle time. This will run when the block is being finalized (before [Hooks::on_finalize]).

fn on_poll(_n: BlockNumber, _weight: &mut WeightMeter)

A hook to run logic after inherent application.

fn on_runtime_upgrade() -> Weight

Hook executed when a code change (aka. a “runtime upgrade”) is detected by the FRAME Executive pallet.

fn try_state(_n: BlockNumber) -> Result<(), DispatchError>

Execute the sanity checks of this pallet, per block.

fn pre_upgrade() -> Result<Vec<u8>, DispatchError>

Execute some pre-checks prior to a runtime upgrade.

fn post_upgrade(_state: Vec<u8>) -> Result<(), DispatchError>

Execute some post-checks after a runtime upgrade.

fn offchain_worker(_n: BlockNumber)

Implementing this function on a pallet allows you to perform long-running tasks that are dispatched as separate threads, and entirely independent of the main blockchain execution.

fn integrity_test()

Check the integrity of this pallet’s configuration.

impl<T: Config> IntegrityTest for Pallet<T>

fn integrity_test()

See [Hooks::integrity_test].

impl<T: Config> OffchainWorker<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn offchain_worker(n: BlockNumberFor<T>)

This function is being called after every block import (when fully synced).

impl<T: Config> OnFinalize<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn on_finalize(n: BlockNumberFor<T>)

See [Hooks::on_finalize].

impl<T: Config> OnGenesis for Pallet<T>

fn on_genesis()

Something that should happen at genesis.

impl<T: Config> OnIdle<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn on_idle(n: BlockNumberFor<T>, remaining_weight: Weight) -> Weight

See [Hooks::on_idle].

impl<T: Config> OnInitialize<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn on_initialize(n: BlockNumberFor<T>) -> Weight

See [Hooks::on_initialize].

impl<T: Config> OnPoll<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn on_poll(n: BlockNumberFor<T>, weight: &mut WeightMeter)

Code to execute every now and then at the beginning of the block after inherent application.

impl<T: Config> OnRuntimeUpgrade for Pallet<T>

fn on_runtime_upgrade() -> Weight

See [Hooks::on_runtime_upgrade].

fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError>

See [Hooks::pre_upgrade].

fn post_upgrade(state: Vec<u8>) -> Result<(), TryRuntimeError>

See [Hooks::post_upgrade].

fn try_on_runtime_upgrade(checks: bool) -> Result<Weight, DispatchError>

The expected and default behavior of this method is to handle executing pre_upgrade -> on_runtime_upgrade -> post_upgrade hooks for a migration.

impl<T: Config> PalletInfoAccess for Pallet<T>

fn index() -> usize

Index of the pallet as configured in the runtime.

fn name() -> &'static str

Name of the pallet as configured in the runtime.

fn name_hash() -> [u8; 16]

Two128 hash of name.

fn module_name() -> &'static str

Name of the Rust module containing the pallet.

fn crate_version() -> CrateVersion

Version of the crate containing the pallet.

impl<T: Config> PalletsInfoAccess for Pallet<T>

fn count() -> usize

The number of pallets’ information that this type represents.

fn infos() -> Vec<PalletInfoData>

All of the pallets’ information that this type represents.

impl<T> PartialEq for Pallet<T>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Config> StorageInfoTrait for Pallet<T>

fn storage_info() -> Vec<StorageInfo>

impl<T: Config> TryDecodeEntireStorage for Pallet<T>

fn try_decode_entire_state() -> Result<usize, Vec<TryDecodeEntireStorageError>>

Decode the entire data under the given storage, returning Ok(bytes_decoded) if success.

impl<T: Config> TryState<<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number> for Pallet<T>

fn try_state( n: BlockNumberFor<T>, _s: TryStateSelect, ) -> Result<(), TryRuntimeError>

Execute the state checks.

impl<T: Config> WhitelistedStorageKeys for Pallet<T>

fn whitelisted_storage_keys() -> Vec<TrackedStorageKey>

Returns a Vec<TrackedStorageKey> indicating the storage keys that should be whitelisted during benchmarking. This means that those keys will be excluded from the benchmarking performance calculation.

impl<T> Eq for Pallet<T>