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Add documentation around pallet coupling #3542

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Mar 7, 2024
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1 change: 1 addition & 0 deletions Cargo.lock

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1 change: 1 addition & 0 deletions docs/sdk/Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,7 @@ pallet-aura = { path = "../../substrate/frame/aura", default-features = false }
# Pallets and FRAME internals
pallet-timestamp = { path = "../../substrate/frame/timestamp" }
pallet-balances = { path = "../../substrate/frame/balances" }
pallet-assets = { path = "../../substrate/frame/assets" }
pallet-transaction-payment = { path = "../../substrate/frame/transaction-payment" }
pallet-utility = { path = "../../substrate/frame/utility" }
pallet-multisig = { path = "../../substrate/frame/multisig" }
Expand Down
144 changes: 70 additions & 74 deletions docs/sdk/src/polkadot_sdk/frame_runtime.rs
Original file line number Diff line number Diff line change
Expand Up @@ -87,93 +87,89 @@
//! * writing a runtime in pure Rust, as done in [this template](https://github.com/JoshOrndorff/frameless-node-template).
//! * writing a runtime in AssemblyScript,as explored in [this project](https://github.com/LimeChain/subsembly).

#[cfg(test)]
mod tests {
use frame::prelude::*;
use frame::prelude::*;

/// A FRAME based pallet. This `mod` is the entry point for everything else. All
/// `#[pallet::xxx]` macros must be defined in this `mod`. Although, frame also provides an
/// experimental feature to break these parts into different `mod`s. See [`pallet_examples`] for
/// more.
#[docify::export]
#[frame::pallet(dev_mode)]
pub mod pallet {
use super::*;
/// A FRAME based pallet. This `mod` is the entry point for everything else. All
/// `#[pallet::xxx]` macros must be defined in this `mod`. Although, frame also provides an
/// experimental feature to break these parts into different `mod`s. See [`pallet_examples`] for
/// more.
#[docify::export]
#[frame::pallet(dev_mode)]
pub mod pallet {
use super::*;

/// The configuration trait of a pallet. Mandatory. Allows a pallet to receive types at a
/// later point from the runtime that wishes to contain it. It allows the pallet to be
/// parameterized over both types and values.
#[pallet::config]
pub trait Config: frame_system::Config {
/// A type that is not known now, but the runtime that will contain this pallet will
/// know it later, therefore we define it here as an associated type.
type RuntimeEvent: IsType<<Self as frame_system::Config>::RuntimeEvent>
+ From<Event<Self>>;
/// The configuration trait of a pallet. Mandatory. Allows a pallet to receive types at a
/// later point from the runtime that wishes to contain it. It allows the pallet to be
/// parameterized over both types and values.
#[pallet::config]
pub trait Config: frame_system::Config {
/// A type that is not known now, but the runtime that will contain this pallet will
/// know it later, therefore we define it here as an associated type.
type RuntimeEvent: IsType<<Self as frame_system::Config>::RuntimeEvent> + From<Event<Self>>;

/// A parameterize-able value that we receive later via the `Get<_>` trait.
type ValueParameter: Get<u32>;
/// A parameterize-able value that we receive later via the `Get<_>` trait.
type ValueParameter: Get<u32>;

/// Similar to [`Config::ValueParameter`], but using `const`. Both are functionally
/// equal, but offer different tradeoffs.
const ANOTHER_VALUE_PARAMETER: u32;
}
/// Similar to [`Config::ValueParameter`], but using `const`. Both are functionally
/// equal, but offer different tradeoffs.
const ANOTHER_VALUE_PARAMETER: u32;
}

/// A mandatory struct in each pallet. All functions callable by external users (aka.
/// transactions) must be attached to this type (see [`frame::pallet_macros::call`]). For
/// convenience, internal (private) functions can also be attached to this type.
#[pallet::pallet]
pub struct Pallet<T>(PhantomData<T>);
/// A mandatory struct in each pallet. All functions callable by external users (aka.
/// transactions) must be attached to this type (see [`frame::pallet_macros::call`]). For
/// convenience, internal (private) functions can also be attached to this type.
#[pallet::pallet]
pub struct Pallet<T>(PhantomData<T>);

/// The events tha this pallet can emit.
#[pallet::event]
pub enum Event<T: Config> {}
/// The events tha this pallet can emit.
#[pallet::event]
pub enum Event<T: Config> {}

/// A storage item that this pallet contains. This will be part of the state root trie/root
/// of the blockchain.
#[pallet::storage]
pub type Value<T> = StorageValue<Value = u32>;
/// A storage item that this pallet contains. This will be part of the state root trie/root
/// of the blockchain.
#[pallet::storage]
pub type Value<T> = StorageValue<Value = u32>;

/// All *dispatchable* call functions (aka. transactions) are attached to `Pallet` in a
/// `impl` block.
#[pallet::call]
impl<T: Config> Pallet<T> {
/// This will be callable by external users, and has two u32s as a parameter.
pub fn some_dispatchable(
_origin: OriginFor<T>,
_param: u32,
_other_para: u32,
) -> DispatchResult {
Ok(())
}
/// All *dispatchable* call functions (aka. transactions) are attached to `Pallet` in a
/// `impl` block.
#[pallet::call]
impl<T: Config> Pallet<T> {
/// This will be callable by external users, and has two u32s as a parameter.
pub fn some_dispatchable(
_origin: OriginFor<T>,
_param: u32,
_other_para: u32,
) -> DispatchResult {
Ok(())
}
}
}

/// A simple runtime that contains the above pallet and `frame_system`, the mandatory pallet of
/// all runtimes. This runtime is for testing, but it shares a lot of similarities with a *real*
/// runtime.
#[docify::export]
pub mod runtime {
use super::pallet as pallet_example;
use frame::{prelude::*, testing_prelude::*};

// The major macro that amalgamates pallets into `enum Runtime`
construct_runtime!(
pub enum Runtime {
System: frame_system,
Example: pallet_example,
}
);
/// A simple runtime that contains the above pallet and `frame_system`, the mandatory pallet of
/// all runtimes. This runtime is for testing, but it shares a lot of similarities with a *real*
/// runtime.
#[docify::export]
pub mod runtime {
use super::pallet as pallet_example;
use frame::{prelude::*, testing_prelude::*};

// These `impl` blocks specify the parameters of each pallet's `trait Config`.
#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
impl frame_system::Config for Runtime {
type Block = MockBlock<Self>;
// The major macro that amalgamates pallets into `enum Runtime`
construct_runtime!(
pub enum Runtime {
System: frame_system,
Example: pallet_example,
}
);

impl pallet_example::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
type ValueParameter = ConstU32<42>;
const ANOTHER_VALUE_PARAMETER: u32 = 42;
}
// These `impl` blocks specify the parameters of each pallet's `trait Config`.
#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
impl frame_system::Config for Runtime {
type Block = MockBlock<Self>;
}

impl pallet_example::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
type ValueParameter = ConstU32<42>;
const ANOTHER_VALUE_PARAMETER: u32 = 42;
}
}
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