lib.rs

// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Support code for the runtime.
//!
//! ## Note on Tuple Traits
//!
//! Many of the traits defined in [`traits`] have auto-implementations on tuples as well. Usually,
//! the tuple is a function of number of pallets in the runtime. By default, the traits are
//! implemented for tuples of up to 64 items.
//
// If you have more pallets in your runtime, or for any other reason need more, enabled `tuples-96`
// or the `tuples-128` complication flag. Note that these features *will increase* the compilation
// of this crate.

#![cfg_attr(not(feature = "std"), no_std)]

/// Export ourself as `frame_support` to make tests happy.
#[doc(hidden)]
extern crate self as frame_support;

/// Private exports that are being used by macros.
///
/// The exports are not stable and should not be relied on.
#[doc(hidden)]
pub mod __private {
	pub use codec;
	pub use frame_metadata as metadata;
	pub use log;
	pub use paste;
	pub use scale_info;
	pub use serde;
	pub use sp_core::{Get, OpaqueMetadata, Void};
	pub use sp_crypto_hashing_proc_macro;
	pub use sp_inherents;
	#[cfg(feature = "std")]
	pub use sp_io::TestExternalities;
	pub use sp_io::{self, hashing, storage::root as storage_root};
	pub use sp_metadata_ir as metadata_ir;
	#[cfg(feature = "std")]
	pub use sp_runtime::{bounded_btree_map, bounded_vec};
	pub use sp_runtime::{
		traits::Dispatchable, DispatchError, RuntimeDebug, StateVersion, TransactionOutcome,
	};
	#[cfg(feature = "std")]
	pub use sp_state_machine::BasicExternalities;
	pub use sp_std;
	pub use sp_tracing;
	pub use tt_call::*;
}

#[macro_use]
pub mod dispatch;
pub mod crypto;
pub mod dispatch_context;
mod hash;
pub mod inherent;
pub mod instances;
pub mod migrations;
pub mod storage;
#[cfg(test)]
mod tests;
pub mod traits;
pub mod weights;
#[doc(hidden)]
pub mod unsigned {
	#[doc(hidden)]
	pub use crate::sp_runtime::traits::ValidateUnsigned;
	#[doc(hidden)]
	pub use crate::sp_runtime::transaction_validity::{
		TransactionSource, TransactionValidity, TransactionValidityError, UnknownTransaction,
	};
}

#[cfg(any(feature = "std", feature = "runtime-benchmarks", feature = "try-runtime", test))]
pub use self::storage::storage_noop_guard::StorageNoopGuard;
pub use self::{
	dispatch::{Callable, Parameter},
	hash::{
		Blake2_128, Blake2_128Concat, Blake2_256, Hashable, Identity, ReversibleStorageHasher,
		StorageHasher, Twox128, Twox256, Twox64Concat,
	},
	storage::{
		bounded_btree_map::BoundedBTreeMap,
		bounded_btree_set::BoundedBTreeSet,
		bounded_vec::{BoundedSlice, BoundedVec},
		migration,
		weak_bounded_vec::WeakBoundedVec,
		IterableStorageDoubleMap, IterableStorageMap, IterableStorageNMap, StorageDoubleMap,
		StorageMap, StorageNMap, StoragePrefixedMap, StorageValue,
	},
};
pub use sp_runtime::{
	self, print, traits::Printable, ConsensusEngineId, MAX_MODULE_ERROR_ENCODED_SIZE,
};

use codec::{Decode, Encode};
use scale_info::TypeInfo;
use sp_runtime::TypeId;

/// A unified log target for support operations.
pub const LOG_TARGET: &str = "runtime::frame-support";

/// A type that cannot be instantiated.
#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone, TypeInfo)]
pub enum Never {}

/// A pallet identifier. These are per pallet and should be stored in a registry somewhere.
#[derive(Clone, Copy, Eq, PartialEq, Encode, Decode, TypeInfo)]
pub struct PalletId(pub [u8; 8]);

impl TypeId for PalletId {
	const TYPE_ID: [u8; 4] = *b"modl";
}

/// Generate a [`#[pallet::storage]`](pallet_macros::storage) alias outside of a pallet.
///
/// This storage alias works similarly to the [`#[pallet::storage]`](pallet_macros::storage)
/// attribute macro. It supports [`StorageValue`](storage::types::StorageValue),
/// [`StorageMap`](storage::types::StorageMap),
/// [`StorageDoubleMap`](storage::types::StorageDoubleMap) and
/// [`StorageNMap`](storage::types::StorageNMap). The main difference to the normal
/// [`#[pallet::storage]`](pallet_macros::storage) is the flexibility around declaring the
/// storage prefix to use. The storage prefix determines where to find the value in the
/// storage. [`#[pallet::storage]`](pallet_macros::storage) uses the name of the pallet as
/// declared in [`construct_runtime!`].
///
/// The flexibility around declaring the storage prefix makes this macro very useful for
/// writing migrations etc.
///
/// # Examples
///
/// There are different ways to declare the `prefix` to use. The `prefix` type can either be
/// declared explicetly by passing it to the macro as an attribute or by letting the macro
/// guess on what the `prefix` type is. The `prefix` is always passed as the first generic
/// argument to the type declaration. When using [`#[pallet::storage]`](pallet_macros::storage)
/// this first generic argument is always `_`. Besides declaring the `prefix`, the rest of the
/// type declaration works as with [`#[pallet::storage]`](pallet_macros::storage).
///
/// 1. Use the `verbatim` prefix type. This prefix type uses the given identifier as the
/// `prefix`:
#[doc = docify::embed!("src/tests/storage_alias.rs", verbatim_attribute)]
///
/// 2. Use the `pallet_name` prefix type. This prefix type uses the name of the pallet as
/// configured in    [`construct_runtime!`] as the `prefix`:
#[doc = docify::embed!("src/tests/storage_alias.rs", pallet_name_attribute)]
/// It requires that the given prefix type implements
/// [`PalletInfoAccess`](traits::PalletInfoAccess) (which is always the case for FRAME pallet
/// structs). In the example above, `Pallet<T>` is the prefix type.
///
/// 3. Use the `dynamic` prefix type. This prefix type calls [`Get::get()`](traits::Get::get)
///    to get the `prefix`:
#[doc = docify::embed!("src/tests/storage_alias.rs", dynamic_attribute)]
/// It requires that the given prefix type implements [`Get<'static str>`](traits::Get).
///
/// 4. Let the macro "guess" what kind of prefix type to use. This only supports verbatim or
///    pallet name. The macro uses the presence of generic arguments to the prefix type as an
///    indication that it should use the pallet name as the `prefix`:
#[doc = docify::embed!("src/tests/storage_alias.rs", storage_alias_guess)]
pub use frame_support_procedural::storage_alias;

pub use frame_support_procedural::derive_impl;

/// Experimental macros for defining dynamic params that can be used in pallet configs.
#[cfg(feature = "experimental")]
pub mod dynamic_params {
	pub use frame_support_procedural::{
		dynamic_aggregated_params_internal, dynamic_pallet_params, dynamic_params,
	};
}

/// Create new implementations of the [`Get`](crate::traits::Get) trait.
///
/// The so-called parameter type can be created in four different ways:
///
/// - Using `const` to create a parameter type that provides a `const` getter. It is required that
///   the `value` is const.
///
/// - Declare the parameter type without `const` to have more freedom when creating the value.
///
/// - Using `storage` to create a storage parameter type. This type is special as it tries to load
///   the value from the storage under a fixed key. If the value could not be found in the storage,
///   the given default value will be returned. It is required that the value implements
///   [`Encode`](codec::Encode) and [`Decode`](codec::Decode). The key for looking up the value in
///   the storage is built using the following formula:
///
///   `twox_128(":" ++ NAME ++ ":")` where `NAME` is the name that is passed as type name.
///
/// - Using `static` to create a static parameter type. Its value is being provided by a static
///   variable with the equivalent name in `UPPER_SNAKE_CASE`. An additional `set` function is
///   provided in this case to alter the static variable. **This is intended for testing ONLY and is
///   ONLY available when `std` is enabled.**
///
/// # Examples
///
/// ```
/// # use frame_support::traits::Get;
/// # use frame_support::parameter_types;
/// // This function cannot be used in a const context.
/// fn non_const_expression() -> u64 { 99 }
///
/// const FIXED_VALUE: u64 = 10;
/// parameter_types! {
///    pub const Argument: u64 = 42 + FIXED_VALUE;
///    /// Visibility of the type is optional
///    OtherArgument: u64 = non_const_expression();
///    pub storage StorageArgument: u64 = 5;
///    pub static StaticArgument: u32 = 7;
/// }
///
/// trait Config {
///    type Parameter: Get<u64>;
///    type OtherParameter: Get<u64>;
///    type StorageParameter: Get<u64>;
///    type StaticParameter: Get<u32>;
/// }
///
/// struct Runtime;
/// impl Config for Runtime {
///    type Parameter = Argument;
///    type OtherParameter = OtherArgument;
///    type StorageParameter = StorageArgument;
///    type StaticParameter = StaticArgument;
/// }
///
/// // In testing, `StaticArgument` can be altered later: `StaticArgument::set(8)`.
/// ```
///
/// # Invalid example:
///
/// ```compile_fail
/// # use frame_support::traits::Get;
/// # use frame_support::parameter_types;
/// // This function cannot be used in a const context.
/// fn non_const_expression() -> u64 { 99 }
///
/// parameter_types! {
///    pub const Argument: u64 = non_const_expression();
/// }
/// ```
#[macro_export]
macro_rules! parameter_types {
	(
		$( #[ $attr:meta ] )*
		$vis:vis const $name:ident $(< $($ty_params:ident),* >)?: $type:ty = $value:expr;
		$( $rest:tt )*
	) => (
		$( #[ $attr ] )*
		$vis struct $name $(
			< $($ty_params),* >( $($crate::__private::sp_std::marker::PhantomData<$ty_params>),* )
		)?;
		$crate::parameter_types!(IMPL_CONST $name , $type , $value $( $(, $ty_params)* )?);
		$crate::parameter_types!( $( $rest )* );
	);
	(
		$( #[ $attr:meta ] )*
		$vis:vis $name:ident $(< $($ty_params:ident),* >)?: $type:ty = $value:expr;
		$( $rest:tt )*
	) => (
		$( #[ $attr ] )*
		$vis struct $name $(
			< $($ty_params),* >( $($crate::__private::sp_std::marker::PhantomData<$ty_params>),* )
		)?;
		$crate::parameter_types!(IMPL $name, $type, $value $( $(, $ty_params)* )?);
		$crate::parameter_types!( $( $rest )* );
	);
	(
		$( #[ $attr:meta ] )*
		$vis:vis storage $name:ident $(< $($ty_params:ident),* >)?: $type:ty = $value:expr;
		$( $rest:tt )*
	) => (
		$( #[ $attr ] )*
		$vis struct $name $(
			< $($ty_params),* >( $($crate::__private::sp_std::marker::PhantomData<$ty_params>),* )
		)?;
		$crate::parameter_types!(IMPL_STORAGE $name, $type, $value $( $(, $ty_params)* )?);
		$crate::parameter_types!( $( $rest )* );
	);
	() => ();
	(IMPL_CONST $name:ident, $type:ty, $value:expr $(, $ty_params:ident)*) => {
		impl< $($ty_params),* > $name< $($ty_params),* > {
			/// Returns the value of this parameter type.
			pub const fn get() -> $type {
				$value
			}
		}

		impl<_I: From<$type> $(, $ty_params)*> $crate::traits::Get<_I> for $name< $($ty_params),* > {
			fn get() -> _I {
				_I::from(Self::get())
			}
		}

		impl< $($ty_params),* > $crate::traits::TypedGet for $name< $($ty_params),* > {
			type Type = $type;
			fn get() -> $type {
				Self::get()
			}
		}
	};
	(IMPL $name:ident, $type:ty, $value:expr $(, $ty_params:ident)*) => {
		impl< $($ty_params),* > $name< $($ty_params),* > {
			/// Returns the value of this parameter type.
			pub fn get() -> $type {
				$value
			}
		}

		impl<_I: From<$type>, $(, $ty_params)*> $crate::traits::Get<_I> for $name< $($ty_params),* > {
			fn get() -> _I {
				_I::from(Self::get())
			}
		}

		impl< $($ty_params),* > $crate::traits::TypedGet for $name< $($ty_params),* > {
			type Type = $type;
			fn get() -> $type {
				Self::get()
			}
		}
	};
	(IMPL_STORAGE $name:ident, $type:ty, $value:expr $(, $ty_params:ident)*) => {
		#[allow(unused)]
		impl< $($ty_params),* > $name< $($ty_params),* > {
			/// Returns the key for this parameter type.
			pub fn key() -> [u8; 16] {
				$crate::__private::sp_crypto_hashing_proc_macro::twox_128!(b":", $name, b":")
			}

			/// Set the value of this parameter type in the storage.
			///
			/// This needs to be executed in an externalities provided environment.
			pub fn set(value: &$type) {
				$crate::storage::unhashed::put(&Self::key(), value);
			}

			/// Returns the value of this parameter type.
			///
			/// This needs to be executed in an externalities provided environment.
			#[allow(unused)]
			pub fn get() -> $type {
				$crate::storage::unhashed::get(&Self::key()).unwrap_or_else(|| $value)
			}
		}

		impl<_I: From<$type> $(, $ty_params)*> $crate::traits::Get<_I> for $name< $($ty_params),* > {
			fn get() -> _I {
				_I::from(Self::get())
			}
		}

		impl< $($ty_params),* > $crate::traits::TypedGet for $name< $($ty_params),* > {
			type Type = $type;
			fn get() -> $type {
				Self::get()
			}
		}
	};
	(
		$( #[ $attr:meta ] )*
		$vis:vis static $name:ident: $type:ty = $value:expr;
		$( $rest:tt )*
	) => (
		$crate::parameter_types_impl_thread_local!(
			$( #[ $attr ] )*
			$vis static $name: $type = $value;
		);
		$crate::parameter_types!( $( $rest )* );
	);
}

#[cfg(not(feature = "std"))]
#[macro_export]
macro_rules! parameter_types_impl_thread_local {
	( $( $any:tt )* ) => {
		compile_error!("static parameter types is only available in std and for testing.");
	};
}

#[cfg(feature = "std")]
#[macro_export]
macro_rules! parameter_types_impl_thread_local {
	(
		$(
			$( #[ $attr:meta ] )*
			$vis:vis static $name:ident: $type:ty = $value:expr;
		)*
	) => {
		$crate::parameter_types_impl_thread_local!(
			IMPL_THREAD_LOCAL $( $vis, $name, $type, $value, )*
		);
		$crate::__private::paste::item! {
			$crate::parameter_types!(
				$(
					$( #[ $attr ] )*
					$vis $name: $type = [<$name:snake:upper>].with(|v| v.borrow().clone());
				)*
			);
			$(
				impl $name {
					/// Set the internal value.
					pub fn set(t: $type) {
						[<$name:snake:upper>].with(|v| *v.borrow_mut() = t);
					}

					/// Mutate the internal value in place.
					#[allow(unused)]
					pub fn mutate<R, F: FnOnce(&mut $type) -> R>(mutate: F) -> R{
						let mut current = Self::get();
						let result = mutate(&mut current);
						Self::set(current);
						result
					}

					/// Get current value and replace with initial value of the parameter type.
					#[allow(unused)]
					pub fn take() -> $type {
						let current = Self::get();
						Self::set($value);
						current
					}
				}
			)*
		}
	};
	(IMPL_THREAD_LOCAL $( $vis:vis, $name:ident, $type:ty, $value:expr, )* ) => {
		$crate::__private::paste::item! {
			thread_local! {
				$(
					pub static [<$name:snake:upper>]: std::cell::RefCell<$type> =
						std::cell::RefCell::new($value);
				)*
			}
		}
	};
}

/// Macro for easily creating a new implementation of both the `Get` and `Contains` traits. Use
/// exactly as with `parameter_types`, only the type must be `Ord`.
#[macro_export]
macro_rules! ord_parameter_types {
	(
		$( #[ $attr:meta ] )*
		$vis:vis const $name:ident: $type:ty = $value:expr;
		$( $rest:tt )*
	) => (
		$( #[ $attr ] )*
		$vis struct $name;
		$crate::parameter_types!{IMPL $name , $type , $value}
		$crate::ord_parameter_types!{IMPL $name , $type , $value}
		$crate::ord_parameter_types!{ $( $rest )* }
	);
	() => ();
	(IMPL $name:ident , $type:ty , $value:expr) => {
		impl $crate::traits::SortedMembers<$type> for $name {
			fn contains(t: &$type) -> bool { &$value == t }
			fn sorted_members() -> $crate::__private::sp_std::prelude::Vec<$type> { vec![$value] }
			fn count() -> usize { 1 }
			#[cfg(feature = "runtime-benchmarks")]
			fn add(_: &$type) {}
		}
		impl $crate::traits::Contains<$type> for $name {
			fn contains(t: &$type) -> bool { &$value == t }
		}
	}
}

/// Print out a formatted message.
///
/// # Example
///
/// ```
/// frame_support::runtime_print!("my value is {}", 3);
/// ```
#[macro_export]
macro_rules! runtime_print {
	($($arg:tt)+) => {
		{
			use core::fmt::Write;
			let mut w = $crate::__private::sp_std::Writer::default();
			let _ = core::write!(&mut w, $($arg)+);
			$crate::__private::sp_io::misc::print_utf8(&w.inner())
		}
	}
}

/// Print out the debuggable type.
pub fn debug(data: &impl sp_std::fmt::Debug) {
	runtime_print!("{:?}", data);
}

#[doc(inline)]
pub use frame_support_procedural::{
	construct_runtime, match_and_insert, transactional, PalletError, RuntimeDebugNoBound,
};

#[cfg(feature = "experimental")]
pub use frame_support_procedural::runtime;

#[doc(hidden)]
pub use frame_support_procedural::{__create_tt_macro, __generate_dummy_part_checker};

/// Derive [`Clone`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::CloneNoBound;
/// trait Config {
/// 		type C: Clone;
/// }
///
/// // Foo implements [`Clone`] because `C` bounds [`Clone`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`Clone`].
/// #[derive(CloneNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::CloneNoBound;

/// Derive [`Eq`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::{EqNoBound, PartialEqNoBound};
/// trait Config {
/// 		type C: Eq;
/// }
///
/// // Foo implements [`Eq`] because `C` bounds [`Eq`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`Eq`].
/// #[derive(PartialEqNoBound, EqNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::EqNoBound;

/// Derive [`PartialEq`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::PartialEqNoBound;
/// trait Config {
/// 		type C: PartialEq;
/// }
///
/// // Foo implements [`PartialEq`] because `C` bounds [`PartialEq`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`PartialEq`].
/// #[derive(PartialEqNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::PartialEqNoBound;

/// Derive [`Ord`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::{OrdNoBound, PartialOrdNoBound, EqNoBound, PartialEqNoBound};
/// trait Config {
/// 		type C: Ord;
/// }
///
/// // Foo implements [`Ord`] because `C` bounds [`Ord`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`Ord`].
/// #[derive(EqNoBound, OrdNoBound, PartialEqNoBound, PartialOrdNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::OrdNoBound;

/// Derive [`PartialOrd`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::{OrdNoBound, PartialOrdNoBound, EqNoBound, PartialEqNoBound};
/// trait Config {
/// 		type C: PartialOrd;
/// }
///
/// // Foo implements [`PartialOrd`] because `C` bounds [`PartialOrd`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`PartialOrd`].
/// #[derive(PartialOrdNoBound, PartialEqNoBound, EqNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::PartialOrdNoBound;

/// Derive [`Debug`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::DebugNoBound;
/// # use core::fmt::Debug;
/// trait Config {
/// 		type C: Debug;
/// }
///
/// // Foo implements [`Debug`] because `C` bounds [`Debug`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`Debug`].
/// #[derive(DebugNoBound)]
/// struct Foo<T: Config> {
/// 		c: T::C,
/// }
/// ```
pub use frame_support_procedural::DebugNoBound;

/// Derive [`Default`] but do not bound any generic.
///
/// This is useful for type generic over runtime:
/// ```
/// # use frame_support::DefaultNoBound;
/// # use core::default::Default;
/// trait Config {
/// 	type C: Default;
/// }
///
/// // Foo implements [`Default`] because `C` bounds [`Default`].
/// // Otherwise compilation will fail with an output telling `c` doesn't implement [`Default`].
/// #[derive(DefaultNoBound)]
/// struct Foo<T: Config> {
/// 	c: T::C,
/// }
///
/// // Also works with enums, by specifying the default with #[default]:
/// #[derive(DefaultNoBound)]
/// enum Bar<T: Config> {
/// 	// Bar will implement Default as long as all of the types within Baz also implement default.
/// 	#[default]
/// 	Baz(T::C),
/// 	Quxx,
/// }
/// ```
pub use frame_support_procedural::DefaultNoBound;

/// Assert the annotated function is executed within a storage transaction.
///
/// The assertion is enabled for native execution and when `debug_assertions` are enabled.
///
/// # Example
///
/// ```
/// # use frame_support::{
/// # 	require_transactional, transactional, dispatch::DispatchResult
/// # };
///
/// #[require_transactional]
/// fn update_all(value: u32) -> DispatchResult {
/// 	// Update multiple storages.
/// 	// Return `Err` to indicate should revert.
/// 	Ok(())
/// }
///
/// #[transactional]
/// fn safe_update(value: u32) -> DispatchResult {
/// 	// This is safe
/// 	update_all(value)
/// }
///
/// fn unsafe_update(value: u32) -> DispatchResult {
/// 	// this may panic if unsafe_update is not called within a storage transaction
/// 	update_all(value)
/// }
/// ```
pub use frame_support_procedural::require_transactional;

/// Convert the current crate version into a [`CrateVersion`](crate::traits::CrateVersion).
///
/// It uses the `CARGO_PKG_VERSION_MAJOR`, `CARGO_PKG_VERSION_MINOR` and
/// `CARGO_PKG_VERSION_PATCH` environment variables to fetch the crate version.
/// This means that the [`CrateVersion`](crate::traits::CrateVersion)
/// object will correspond to the version of the crate the macro is called in!
///
/// # Example
///
/// ```
/// # use frame_support::{traits::CrateVersion, crate_to_crate_version};
/// const Version: CrateVersion = crate_to_crate_version!();
/// ```
pub use frame_support_procedural::crate_to_crate_version;

/// Return Err of the expression: `return Err($expression);`.
///
/// Used as `fail!(expression)`.
#[macro_export]
macro_rules! fail {
	( $y:expr ) => {{
		return Err($y.into());
	}};
}

/// Evaluate `$x:expr` and if not true return `Err($y:expr)`.
///
/// Used as `ensure!(expression_to_ensure, expression_to_return_on_false)`.
#[macro_export]
macro_rules! ensure {
	( $x:expr, $y:expr $(,)? ) => {{
		if !$x {
			$crate::fail!($y);
		}
	}};
}

/// Evaluate an expression, assert it returns an expected `Err` value and that
/// runtime storage has not been mutated (i.e. expression is a no-operation).
///
/// Used as `assert_noop(expression_to_assert, expected_error_expression)`.
#[macro_export]
macro_rules! assert_noop {
	(
		$x:expr,
		$y:expr $(,)?
	) => {
		let h = $crate::__private::storage_root($crate::__private::StateVersion::V1);
		$crate::assert_err!($x, $y);
		assert_eq!(
			h,
			$crate::__private::storage_root($crate::__private::StateVersion::V1),
			"storage has been mutated"
		);
	};
}

/// Evaluate any expression and assert that runtime storage has not been mutated
/// (i.e. expression is a storage no-operation).
///
/// Used as `assert_storage_noop(expression_to_assert)`.
#[macro_export]
macro_rules! assert_storage_noop {
	(
		$x:expr
	) => {
		let h = $crate::__private::storage_root($crate::__private::StateVersion::V1);
		$x;
		assert_eq!(h, $crate::__private::storage_root($crate::__private::StateVersion::V1));
	};
}

/// Assert an expression returns an error specified.
///
/// Used as `assert_err!(expression_to_assert, expected_error_expression)`
#[macro_export]
macro_rules! assert_err {
	( $x:expr , $y:expr $(,)? ) => {
		assert_eq!($x, Err($y.into()));
	};
}

/// Assert an expression returns an error specified.
///
/// This can be used on `DispatchResultWithPostInfo` when the post info should
/// be ignored.
#[macro_export]
macro_rules! assert_err_ignore_postinfo {
	( $x:expr , $y:expr $(,)? ) => {
		$crate::assert_err!($x.map(|_| ()).map_err(|e| e.error), $y);
	};
}

/// Assert an expression returns error with the given weight.
#[macro_export]
macro_rules! assert_err_with_weight {
	($call:expr, $err:expr, $weight:expr $(,)? ) => {
		if let Err(dispatch_err_with_post) = $call {
			$crate::assert_err!($call.map(|_| ()).map_err(|e| e.error), $err);
			assert_eq!(dispatch_err_with_post.post_info.actual_weight, $weight);
		} else {
			::core::panic!("expected Err(_), got Ok(_).")
		}
	};
}

/// Panic if an expression doesn't evaluate to `Ok`.
///
/// Used as `assert_ok!(expression_to_assert, expected_ok_expression)`,
/// or `assert_ok!(expression_to_assert)` which would assert against `Ok(())`.
#[macro_export]
macro_rules! assert_ok {
	( $x:expr $(,)? ) => {
		let is = $x;
		match is {
			Ok(_) => (),
			_ => assert!(false, "Expected Ok(_). Got {:#?}", is),
		}
	};
	( $x:expr, $y:expr $(,)? ) => {
		assert_eq!($x, Ok($y));
	};
}

/// Assert that the maximum encoding size does not exceed the value defined in
/// [`MAX_MODULE_ERROR_ENCODED_SIZE`] during compilation.
///
/// This macro is intended to be used in conjunction with `tt_call!`.
#[macro_export]
macro_rules! assert_error_encoded_size {
	{
		path = [{ $($path:ident)::+ }]
		runtime = [{ $runtime:ident }]
		assert_message = [{ $assert_message:literal }]
		error = [{ $error:ident }]
	} => {
		const _: () = assert!(
			<
				$($path::)+$error<$runtime> as $crate::traits::PalletError
			>::MAX_ENCODED_SIZE <= $crate::MAX_MODULE_ERROR_ENCODED_SIZE,
			$assert_message
		);
	};
	{
		path = [{ $($path:ident)::+ }]
		runtime = [{ $runtime:ident }]
		assert_message = [{ $assert_message:literal }]
	} => {};
}

/// Do something hypothetically by rolling back any changes afterwards.
///
/// Returns the original result of the closure.
#[macro_export]
#[cfg(feature = "experimental")]
macro_rules! hypothetically {
	( $e:expr ) => {
		$crate::storage::transactional::with_transaction(|| -> $crate::__private::TransactionOutcome<Result<_, $crate::__private::DispatchError>> {
			$crate::__private::TransactionOutcome::Rollback(Ok($e))
		},
		).expect("Always returning Ok; qed")
	};
}

/// Assert something to be *hypothetically* `Ok`, without actually committing it.
///
/// Reverts any storage changes made by the closure.
#[macro_export]
#[cfg(feature = "experimental")]
macro_rules! hypothetically_ok {
	($e:expr $(, $args:expr)* $(,)?) => {
		$crate::assert_ok!($crate::hypothetically!($e) $(, $args)*);
	};
}

#[doc(hidden)]
pub use serde::{Deserialize, Serialize};

#[doc(hidden)]
#[cfg(not(no_std))]
pub use macro_magic;

/// Prelude to be used for pallet testing, for ease of use.
#[cfg(feature = "std")]
pub mod testing_prelude {
	pub use super::{
		assert_err, assert_err_ignore_postinfo, assert_err_with_weight, assert_error_encoded_size,
		assert_noop, assert_ok, assert_storage_noop, parameter_types, traits::Get,
	};
	pub use sp_arithmetic::assert_eq_error_rate;
	pub use sp_runtime::{bounded_btree_map, bounded_vec};
}

/// Prelude to be used alongside pallet macro, for ease of use.
pub mod pallet_prelude {
	pub use crate::{
		defensive, defensive_assert,
		dispatch::{DispatchClass, DispatchResult, DispatchResultWithPostInfo, Parameter, Pays},
		ensure,
		inherent::{InherentData, InherentIdentifier, ProvideInherent},
		storage,
		storage::{
			bounded_btree_map::BoundedBTreeMap,
			bounded_btree_set::BoundedBTreeSet,
			bounded_vec::BoundedVec,
			types::{
				CountedStorageMap, CountedStorageNMap, Key as NMapKey, OptionQuery, ResultQuery,
				StorageDoubleMap, StorageMap, StorageNMap, StorageValue, ValueQuery,
			},
			weak_bounded_vec::WeakBoundedVec,
			StorageList,
		},
		traits::{
			BuildGenesisConfig, ConstU32, EnsureOrigin, Get, GetDefault, GetStorageVersion, Hooks,
			IsType, PalletInfoAccess, StorageInfoTrait, StorageVersion, Task, TypedGet,
		},
		Blake2_128, Blake2_128Concat, Blake2_256, CloneNoBound, DebugNoBound, EqNoBound, Identity,
		PartialEqNoBound, RuntimeDebugNoBound, Twox128, Twox256, Twox64Concat,
	};
	pub use codec::{Decode, Encode, MaxEncodedLen};
	pub use frame_support::pallet_macros::*;

	/// The optional attribute `#[inject_runtime_type]` can be attached to `RuntimeCall`,
	/// `RuntimeEvent`, `RuntimeOrigin` or `PalletInfo` in an impl statement that has
	/// `#[register_default_impl]` attached to indicate that this item is generated by
	/// `construct_runtime`.
	///
	/// Attaching this attribute to such an item ensures that the combined impl generated via
	/// [`#[derive_impl(..)]`](`frame_support::derive_impl`) will use the correct
	/// type auto-generated by
	/// `construct_runtime!`.
	#[doc = docify::embed!("src/tests/inject_runtime_type.rs", derive_impl_works_with_runtime_type_injection)]
	///
	/// However, if `no_aggregated_types` is specified while using
	/// `[`#[derive_impl(..)]`](`frame_support::derive_impl`)`, then these items are attached
	/// verbatim to the combined impl.
	#[doc = docify::embed!("src/tests/inject_runtime_type.rs", derive_impl_works_with_no_aggregated_types)]
	pub use frame_support_procedural::inject_runtime_type;
	pub use frame_support_procedural::register_default_impl;
	pub use scale_info::TypeInfo;
	pub use sp_inherents::MakeFatalError;
	pub use sp_runtime::{
		traits::{MaybeSerializeDeserialize, Member, ValidateUnsigned},
		transaction_validity::{
			InvalidTransaction, TransactionLongevity, TransactionPriority, TransactionSource,
			TransactionTag, TransactionValidity, TransactionValidityError, UnknownTransaction,
			ValidTransaction,
		},
		DispatchError, RuntimeDebug, MAX_MODULE_ERROR_ENCODED_SIZE,
	};
	pub use sp_std::marker::PhantomData;
	pub use sp_weights::Weight;
}

/// The pallet struct placeholder `#[pallet::pallet]` is mandatory and allows you to
/// specify pallet information.
///
/// The struct must be defined as follows:
/// ```
/// #[frame_support::pallet]
/// mod pallet {
/// 	#[pallet::pallet]         // <- the macro
/// 	pub struct Pallet<T>(_);  // <- the struct definition
///
/// 	#[pallet::config]
/// 	pub trait Config: frame_system::Config {}
/// }
/// ```
//
/// I.e. a regular struct definition named `Pallet`, with generic T and no where clause.
///
/// ## Macro expansion:
///
/// The macro adds this attribute to the Pallet struct definition:
/// ```ignore
/// #[derive(
/// 	frame_support::CloneNoBound,
/// 	frame_support::EqNoBound,
/// 	frame_support::PartialEqNoBound,
/// 	frame_support::RuntimeDebugNoBound,
/// )]
/// ```
/// and replaces the type `_` with `PhantomData<T>`.
///
/// It also implements on the pallet:
///
/// * [`GetStorageVersion`](frame_support::traits::GetStorageVersion)
/// * [`OnGenesis`](frame_support::traits::OnGenesis): contains some logic to write the pallet
///   version into storage.
/// * [`PalletInfoAccess`](frame_support::traits::PalletInfoAccess) to ease access to pallet
///   information given by [`frame_support::traits::PalletInfo`]. (The implementation uses the
///   associated type [`frame_support::traits::PalletInfo`]).
/// * [`StorageInfoTrait`](frame_support::traits::StorageInfoTrait) to give information about
///   storages.
///
/// If the attribute `set_storage_max_encoded_len` is set then the macro calls
/// [`StorageInfoTrait`](frame_support::traits::StorageInfoTrait) for each storage in the
/// implementation of [`StorageInfoTrait`](frame_support::traits::StorageInfoTrait) for the
/// pallet. Otherwise it implements
/// [`StorageInfoTrait`](frame_support::traits::StorageInfoTrait) for the pallet using the
/// [`PartialStorageInfoTrait`](frame_support::traits::PartialStorageInfoTrait)
/// implementation of storages.
///
/// ## Dev Mode (`#[pallet(dev_mode)]`)
///
/// Specifying the argument `dev_mode` will allow you to enable dev mode for a pallet. The
/// aim of dev mode is to loosen some of the restrictions and requirements placed on
/// production pallets for easy tinkering and development. Dev mode pallets should not be
/// used in production. Enabling dev mode has the following effects:
///
/// * Weights no longer need to be specified on every `#[pallet::call]` declaration. By
///   default, dev mode pallets will assume a weight of zero (`0`) if a weight is not
///   specified. This is equivalent to specifying `#[weight(0)]` on all calls that do not
///   specify a weight.
/// * Call indices no longer need to be specified on every `#[pallet::call]` declaration. By
///   default, dev mode pallets will assume a call index based on the order of the call.