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Added AllSiblingSystemParachains matcher to be used at a parachain level (#2422)

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As suggested in this thread:
https://github.com/polkadot-fellows/runtimes/pull/87#discussion_r1400237122

We already have the `IsChildSystemParachain`, which may be used at relay
chain, but it can't be used at a parachain level. So let's use
`AllSiblingSystemParachains` for that. I was thinking about
`AllSystemParachains`, but it may cause wrong impression that it can be
used at a relay chain level.

---------

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
This commit is contained in:
Svyatoslav Nikolsky
2023-12-07 00:53:31 +03:00
committed by GitHub
parent 4df313fbc7
commit 0b3d0677f8
12 changed files with 93 additions and 122 deletions
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cumulus/parachains/common/src/xcm_config.rs
+39 -3
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@@ -100,6 +100,25 @@ impl<SystemParachainMatcher: Contains<MultiLocation>, Runtime: parachain_info::C
}
}
/// Contains all sibling system parachains, including the one where this matcher is used.
///
/// This structure can only be used at a parachain level. In the Relay Chain, please use
/// the `xcm_builder::IsChildSystemParachain` matcher.
pub struct AllSiblingSystemParachains;
impl Contains<MultiLocation> for AllSiblingSystemParachains {
fn contains(l: &MultiLocation) -> bool {
log::trace!(target: "xcm::contains", "AllSiblingSystemParachains location: {:?}", l);
match *l {
// System parachain
MultiLocation { parents: 1, interior: X1(Parachain(id)) } =>
ParaId::from(id).is_system(),
// Everything else
_ => false,
}
}
}
/// Accepts an asset if it is a concrete asset from the system (Relay Chain or system parachain).
pub struct ConcreteAssetFromSystem<AssetLocation>(PhantomData<AssetLocation>);
impl<AssetLocation: Get<MultiLocation>> ContainsPair<MultiAsset, MultiLocation>
@@ -122,12 +141,14 @@ impl<AssetLocation: Get<MultiLocation>> ContainsPair<MultiAsset, MultiLocation>
#[cfg(test)]
mod tests {
use frame_support::parameter_types;
use frame_support::{parameter_types, traits::Contains};
use super::{
ConcreteAssetFromSystem, ContainsPair, GeneralIndex, Here, MultiAsset, MultiLocation,
PalletInstance, Parachain, Parent,
AllSiblingSystemParachains, ConcreteAssetFromSystem, ContainsPair, GeneralIndex, Here,
MultiAsset, MultiLocation, PalletInstance, Parachain, Parent,
};
use polkadot_primitives::LOWEST_PUBLIC_ID;
use xcm::latest::prelude::*;
parameter_types! {
pub const RelayLocation: MultiLocation = MultiLocation::parent();
@@ -180,4 +201,19 @@ mod tests {
);
}
}
#[test]
fn all_sibling_system_parachains_works() {
// system parachain
assert!(AllSiblingSystemParachains::contains(&MultiLocation::new(1, X1(Parachain(1)))));
// non-system parachain
assert!(!AllSiblingSystemParachains::contains(&MultiLocation::new(
1,
X1(Parachain(LOWEST_PUBLIC_ID.into()))
)));
// when used at relay chain
assert!(!AllSiblingSystemParachains::contains(&MultiLocation::new(0, X1(Parachain(1)))));
// when used with non-parachain
assert!(!AllSiblingSystemParachains::contains(&MultiLocation::new(1, X1(OnlyChild))));
}
}