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Contracts: Add XCM traits to interface with contracts (#2086)

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We are introducing a new set of `XcmController` traits (final name yet
to be determined).
These traits are implemented by `pallet-xcm` and allows other pallets,
such as `pallet_contracts`, to rely on these traits instead of tight
coupling them to `pallet-xcm`.

Using only the existing Xcm traits would mean duplicating the logic from
`pallet-xcm` in these other pallets, which we aim to avoid. Our
objective is to ensure that when these APIs are called from
`pallet-contracts`, they produce the exact same outcomes as if called
directly from `pallet-xcm`.

The other benefits is that we can also expose return values to
`pallet-contracts` instead of just calling `pallet-xcm` dispatchable and
getting a `DispatchResult` back.

See traits integration in this PR
https://github.com/paritytech/polkadot-sdk/pull/1248, where the traits
are used as follow to define and implement `pallet-contracts` Config.
```rs
// Contracts config:
pub trait Config: frame_system::Config {
  // ...

  /// A type that exposes XCM APIs, allowing contracts to interact with other parachains, and
  /// execute XCM programs.
  type Xcm: xcm_executor::traits::Controller<
	  OriginFor<Self>,
	  <Self as frame_system::Config>::RuntimeCall,
	  BlockNumberFor<Self>,
  >;
}

// implementation
impl pallet_contracts::Config for Runtime {
        // ...

	type Xcm = pallet_xcm::Pallet<Self>;
}
```

---------

Co-authored-by: Alexander Theißen <alex.theissen@me.com>
Co-authored-by: command-bot <>
This commit is contained in:
PG Herveou
2023-11-10 16:38:24 +01:00
committed by GitHub
parent 84ddbaf684
commit 6b7be115fd
19 changed files with 1604 additions and 913 deletions
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cumulus/parachains/runtimes/bridge-hubs/bridge-hub-westend/src/weights/pallet_xcm.rs
+27
View File
@@ -286,4 +286,31 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
.saturating_add(T::DbWeight::get().reads(9))
.saturating_add(T::DbWeight::get().writes(4))
}
/// Storage: `PolkadotXcm::QueryCounter` (r:1 w:1)
/// Proof: `PolkadotXcm::QueryCounter` (`max_values`: Some(1), `max_size`: None, mode: `Measured`)
/// Storage: `PolkadotXcm::Queries` (r:0 w:1)
/// Proof: `PolkadotXcm::Queries` (`max_values`: None, `max_size`: None, mode: `Measured`)
fn new_query() -> Weight {
// Proof Size summary in bytes:
// Measured: `32`
// Estimated: `1517`
// Minimum execution time: 4_142_000 picoseconds.
Weight::from_parts(4_308_000, 0)
.saturating_add(Weight::from_parts(0, 1517))
.saturating_add(T::DbWeight::get().reads(1))
.saturating_add(T::DbWeight::get().writes(2))
}
/// Storage: `PolkadotXcm::Queries` (r:1 w:1)
/// Proof: `PolkadotXcm::Queries` (`max_values`: None, `max_size`: None, mode: `Measured`)
fn take_response() -> Weight {
// Proof Size summary in bytes:
// Measured: `7669`
// Estimated: `11134`
// Minimum execution time: 25_814_000 picoseconds.
Weight::from_parts(26_213_000, 0)
.saturating_add(Weight::from_parts(0, 11134))
.saturating_add(T::DbWeight::get().reads(1))
.saturating_add(T::DbWeight::get().writes(1))
}
}