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…3157) This PR addresses two issues: - It modifies `DepositAsset`'s asset filter from `All` to `AllCounted(1)` to prevent potentially charging excessive weight/fees. This adjustment avoids situations where fees could be calculated based on the count of assets, as illustrated [here](https://github.com/paritytech/polkadot-sdk/blob/master/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/weights/xcm/mod.rs#L38-L46). - It encapsulates `DepositAsset` with `SetAppendix` to ensure that `fees` are not trapped in any case. For instance, this prevents issues when `ExportXcm::validate` encounters an error during the processing of `ExportMessage`.
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108
polkadot/xcm/xcm-builder/src/tests/bridging/universal_exports.rs
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| // Copyright (C) Parity Technologies (UK) Ltd. | ||
| // This file is part of Polkadot. | ||
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| // Polkadot is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
|
|
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| // Polkadot is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
|
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| // You should have received a copy of the GNU General Public License | ||
| // along with Polkadot. If not, see <http://www.gnu.org/licenses/>. | ||
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| use super::*; | ||
| use crate::test_utils::TrappedAssets; | ||
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| #[test] | ||
| fn sovereign_paid_remote_exporter_produces_xcm_which_does_not_trap_assets() { | ||
| frame_support::parameter_types! { | ||
| pub BridgeFeeAsset: Location = Parent.into(); | ||
| pub LocalNetwork: NetworkId = ExecutorUniversalLocation::get().global_consensus().expect("valid `NetworkId`"); | ||
| pub LocalBridgeLocation: Location = match &ExecutorUniversalLocation::get().split_global() { | ||
| Ok((_, junctions)) => Location::new(1, junctions.clone()), | ||
| _ => panic!("unexpected location format") | ||
| }; | ||
| pub RemoteNetwork: NetworkId = ByGenesis([1; 32]); | ||
| pub SendOverBridgePrice: u128 = 333; | ||
| pub BridgeTable: Vec<NetworkExportTableItem> = vec![ | ||
| NetworkExportTableItem::new( | ||
| RemoteNetwork::get(), | ||
| None, | ||
| LocalBridgeLocation::get(), | ||
| Some((BridgeFeeAsset::get(), SendOverBridgePrice::get()).into()) | ||
| ) | ||
| ]; | ||
| pub static SenderUniversalLocation: InteriorLocation = (LocalNetwork::get(), Parachain(50)).into(); | ||
| } | ||
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| // `SovereignPaidRemoteExporter` e.g. used on sibling of `ExecutorUniversalLocation` | ||
| type Exporter = SovereignPaidRemoteExporter< | ||
| NetworkExportTable<BridgeTable>, | ||
| TestMessageSender, | ||
| SenderUniversalLocation, | ||
| >; | ||
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| // prepare message on sending chain with tested `Exporter` and translate it to the executor | ||
| // message type | ||
| let message = Exporter::validate( | ||
| &mut Some(Location::new(2, [GlobalConsensus(RemoteNetwork::get())])), | ||
| &mut Some(Xcm(vec![])), | ||
| ) | ||
| .expect("valid message"); | ||
| let message = Xcm::<TestCall>::from(message.0 .1); | ||
| let mut message_id = message.using_encoded(sp_io::hashing::blake2_256); | ||
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| // allow origin to pass barrier | ||
| let origin = Location::new(1, Parachain(50)); | ||
| AllowPaidFrom::set(vec![origin.clone()]); | ||
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| // fund origin | ||
| add_asset(origin.clone(), (AssetId(BridgeFeeAsset::get()), SendOverBridgePrice::get() * 2)); | ||
| WeightPrice::set((BridgeFeeAsset::get().into(), 1_000_000_000_000, 1024 * 1024)); | ||
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| // check before | ||
| assert!(TrappedAssets::get().is_empty()); | ||
| assert_eq!(exported_xcm(), vec![]); | ||
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| // execute XCM with overrides for `MessageExporter` behavior to return `Unroutable` error on | ||
| // validate | ||
| set_exporter_override( | ||
| |_, _, _, _, _| Err(SendError::Unroutable), | ||
| |_, _, _, _, _| Err(SendError::Transport("not allowed to call here")), | ||
| ); | ||
| let r = XcmExecutor::<TestConfig>::prepare_and_execute( | ||
| origin.clone(), | ||
| message.clone(), | ||
| &mut message_id, | ||
| Weight::from_parts(2_000_000_000_000, 2_000_000_000_000), | ||
| Weight::zero(), | ||
| ); | ||
| assert_eq!( | ||
| r, | ||
| Outcome::Incomplete { used: Weight::from_parts(50, 50), error: XcmError::Unroutable } | ||
| ); | ||
| // check empty trapped assets | ||
| assert!(TrappedAssets::get().is_empty()); | ||
| // no xcm exported | ||
| assert_eq!(exported_xcm(), vec![]); | ||
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| // execute XCM again with clear `MessageExporter` overrides behavior to expect delivery | ||
| clear_exporter_override(); | ||
| let r = XcmExecutor::<TestConfig>::prepare_and_execute( | ||
| origin.clone(), | ||
| message, | ||
| &mut message_id, | ||
| Weight::from_parts(2_000_000_000_000, 2_000_000_000_000), | ||
| Weight::zero(), | ||
| ); | ||
| assert_eq!(r, Outcome::Complete { used: Weight::from_parts(50, 50) }); | ||
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| // check empty trapped assets | ||
| assert!(TrappedAssets::get().is_empty()); | ||
| // xcm exported | ||
| assert_eq!(exported_xcm().len(), 1); | ||
| } |
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