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XCM docs and tests (#2948)

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* WIP

* add tests and docs for DoubleEncoded

* reformat parent_count

* add test for match_and_split

* fix append_with docs and add tests

* move Parachain enum variant to tuple

* Fix stuff

* add to append test

* simplify match

* formatting

* format and extend doc comments (including examples)

* fix typo

* add some doc comments

* add test for location inverter

* Add more tests/docs

* Fix build

* matches fungibles

* currency adapter.

* add more tests for location inverter

* extract max length magic number into constant

* adapters.

* Apply suggestions from code review

* Final touches.

* Repot and fixes

* Remove last todo

* Apply suggestions from code review

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-builder/src/barriers.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-builder/src/barriers.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-builder/src/currency_adapter.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-builder/src/filter_asset_location.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-builder/src/matches_fungible.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-executor/src/traits/conversion.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-executor/src/traits/conversion.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-executor/src/traits/transact_asset.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update xcm/xcm-executor/src/traits/should_execute.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

Co-authored-by: kianenigma <kian@parity.io>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Alexander Popiak
2021-06-03 04:01:25 +02:00
committed by GitHub
parent 512b366280
commit a28d4a5c5d
22 changed files with 715 additions and 200 deletions
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polkadot/xcm/xcm-builder/src/location_conversion.rs
+106 -3
View File
@@ -23,7 +23,6 @@ use xcm::v0::{MultiLocation, NetworkId, Junction};
use xcm_executor::traits::{InvertLocation, Convert};
pub struct Account32Hash<Network, AccountId>(PhantomData<(Network, AccountId)>);
impl<
Network: Get<NetworkId>,
AccountId: From<[u8; 32]> + Into<[u8; 32]> + Clone,
@@ -37,6 +36,8 @@ impl<
}
}
/// A [`MultiLocation`] consisting of a single `Parent` [`Junction`] will be converted to the
/// default value of `AccountId` (e.g. all zeros for `AccountId32`).
pub struct ParentIsDefault<AccountId>(PhantomData<AccountId>);
impl<
AccountId: Default + Eq + Clone,
@@ -81,7 +82,6 @@ impl<
}
pub struct SiblingParachainConvertsVia<ParaId, AccountId>(PhantomData<(ParaId, AccountId)>);
impl<
ParaId: From<u32> + Into<u32> + AccountIdConversion<AccountId>,
AccountId: Clone,
@@ -103,6 +103,7 @@ impl<
}
}
/// Extracts the `AccountId32` from the passed `location` if the network matches.
pub struct AccountId32Aliases<Network, AccountId>(PhantomData<(Network, AccountId)>);
impl<
Network: Get<NetworkId>,
@@ -142,7 +143,40 @@ impl<
}
}
/// Simple location inverter; give it this location's ancestry and it'll figure out the inverted location.
/// Simple location inverter; give it this location's ancestry and it'll figure out the inverted
/// location.
///
/// # Example
/// ## Network Topology
/// ```txt
/// v Source
/// Relay -> Para 1 -> Account20
/// -> Para 2 -> Account32
/// ^ Target
/// ```
/// ```rust
/// # use frame_support::parameter_types;
/// # use xcm::v0::{MultiLocation::{self, *}, Junction::*, NetworkId::Any};
/// # use xcm_builder::LocationInverter;
/// # use xcm_executor::traits::InvertLocation;
/// # fn main() {
/// parameter_types!{
/// pub Ancestry: MultiLocation = X2(
/// Parachain(1),
/// AccountKey20 { network: Any, key: Default::default() },
/// );
/// }
///
/// let input = X4(Parent, Parent, Parachain(2), AccountId32 { network: Any, id: Default::default() });
/// let inverted = LocationInverter::<Ancestry>::invert_location(&input);
/// assert_eq!(inverted, X4(
/// Parent,
/// Parent,
/// Parachain(1),
/// AccountKey20 { network: Any, key: Default::default() },
/// ));
/// # }
/// ```
pub struct LocationInverter<Ancestry>(PhantomData<Ancestry>);
impl<Ancestry: Get<MultiLocation>> InvertLocation for LocationInverter<Ancestry> {
fn invert_location(location: &MultiLocation) -> MultiLocation {
@@ -160,3 +194,72 @@ impl<Ancestry: Get<MultiLocation>> InvertLocation for LocationInverter<Ancestry>
result
}
}
#[cfg(test)]
mod tests {
use super::*;
use frame_support::parameter_types;
use xcm::v0::{MultiLocation::*, Junction::*, NetworkId::Any};
fn account20() -> Junction {
AccountKey20 { network: Any, key: Default::default() }
}
fn account32() -> Junction {
AccountId32 { network: Any, id: Default::default() }
}
// Network Topology
// v Source
// Relay -> Para 1 -> SmartContract -> Account
// -> Para 2 -> Account
// ^ Target
//
// Inputs and outputs written as file paths:
//
// input location (source to target): ../../../para_2/account32_default
// ancestry (root to source): para_1/account20_default/account20_default
// =>
// output (target to source): ../../para_1/account20_default/account20_default
#[test]
fn inverter_works_in_tree() {
parameter_types!{
pub Ancestry: MultiLocation = X3(Parachain(1), account20(), account20());
}
let input = X5(Parent, Parent, Parent, Parachain(2), account32());
let inverted = LocationInverter::<Ancestry>::invert_location(&input);
assert_eq!(inverted, X5(Parent, Parent, Parachain(1), account20(), account20()));
}
// Network Topology
// v Source
// Relay -> Para 1 -> SmartContract -> Account
// ^ Target
#[test]
fn inverter_uses_ancestry_as_inverted_location() {
parameter_types!{
pub Ancestry: MultiLocation = X2(account20(), account20());
}
let input = X2(Parent, Parent);
let inverted = LocationInverter::<Ancestry>::invert_location(&input);
assert_eq!(inverted, X2(account20(), account20()));
}
// Network Topology
// v Source
// Relay -> Para 1 -> CollectivePallet -> Plurality
// ^ Target
#[test]
fn inverter_uses_only_child_on_missing_ancestry() {
parameter_types!{
pub Ancestry: MultiLocation = X1(PalletInstance(5));
}
let input = X2(Parent, Parent);
let inverted = LocationInverter::<Ancestry>::invert_location(&input);
assert_eq!(inverted, X2(PalletInstance(5), OnlyChild));
}
}