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Impl WeightTrader for tuple (#3601)

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* Impl WeightTrader for tuple.

* fmt

* Renaming.

* add tracing for buy_weight

* Add comment clarifying the default behavior of a WeightTrader tuple

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
This commit is contained in:
Shaun Wang
2021-08-18 12:02:24 +12:00
committed by GitHub
parent 9607487442
commit 26dec7a3ec
2 changed files with 79 additions and 4 deletions
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polkadot/xcm/xcm-builder/src/tests.rs
+50
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@@ -15,6 +15,7 @@
// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
use super::{mock::*, *};
use frame_support::{assert_err, weights::constants::WEIGHT_PER_SECOND};
use xcm::latest::prelude::*;
use xcm_executor::{traits::*, Config, XcmExecutor};
@@ -383,3 +384,52 @@ fn prepaid_result_of_query_should_get_free_execution() {
let r = XcmExecutor::<TestConfig>::execute_xcm(origin.clone(), message.clone(), weight_limit);
assert_eq!(r, Outcome::Incomplete(10, XcmError::Barrier));
}
fn fungible_multi_asset(location: MultiLocation, amount: u128) -> MultiAsset {
(AssetId::from(location), Fungibility::Fungible(amount)).into()
}
#[test]
fn weight_trader_tuple_should_work() {
pub const PARA_1: MultiLocation = X1(Parachain(1));
pub const PARA_2: MultiLocation = X1(Parachain(2));
parameter_types! {
pub static HereWeightPrice: (AssetId, u128) = (Here.into(), WEIGHT_PER_SECOND.into());
pub static PARA1WeightPrice: (AssetId, u128) = (PARA_1.into(), WEIGHT_PER_SECOND.into());
}
type Traders = (
// trader one
FixedRateOfFungible<HereWeightPrice, ()>,
// trader two
FixedRateOfFungible<PARA1WeightPrice, ()>,
);
let mut traders = Traders::new();
// trader one buys weight
assert_eq!(
traders.buy_weight(5, fungible_multi_asset(Here, 10).into()),
Ok(fungible_multi_asset(Here, 5).into()),
);
// trader one refunds
assert_eq!(traders.refund_weight(2), Some(fungible_multi_asset(Here, 2)));
let mut traders = Traders::new();
// trader one failed; trader two buys weight
assert_eq!(
traders.buy_weight(5, fungible_multi_asset(PARA_1, 10).into()),
Ok(fungible_multi_asset(PARA_1, 5).into()),
);
// trader two refunds
assert_eq!(traders.refund_weight(2), Some(fungible_multi_asset(PARA_1, 2)));
let mut traders = Traders::new();
// all traders fails
assert_err!(
traders.buy_weight(5, fungible_multi_asset(PARA_2, 10).into()),
XcmError::TooExpensive,
);
// and no refund
assert_eq!(traders.refund_weight(2), None);
}