mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-30 22:11:02 +00:00
Adrian Catangiu
18257373b3
## Motivation `pallet-xcm` is the main user-facing interface for XCM functionality, including assets manipulation functions like `teleportAssets()` and `reserve_transfer_assets()` calls. While `teleportAsset()` works both ways, `reserve_transfer_assets()` works only for sending reserve-based assets to a remote destination and beneficiary when the reserve is the _local chain_. ## Solution This PR enhances `pallet_xcm::(limited_)reserve_withdraw_assets` to support transfers when reserves are other chains. This will allow complete, **bi-directional** reserve-based asset transfers user stories using `pallet-xcm`. Enables following scenarios: - transferring assets with local reserve (was previously supported iff asset used as fee also had local reserve - now it works in all cases), - transferring assets with reserve on destination, - transferring assets with reserve on remote/third-party chain (iff assets and fees have same remote reserve), - transferring assets with reserve different than the reserve of the asset to be used as fees - meaning can be used to transfer random asset with local/dest reserve while using DOT for fees on all involved chains, even if DOT local/dest reserve doesn't match asset reserve, - transferring assets with any type of local/dest reserve while using fees which can be teleported between involved chains. All of the above is done by pallet inner logic without the user having to specify which scenario/reserves/teleports/etc. The correct scenario and corresponding XCM programs are identified, and respectively, built automatically based on runtime configuration of trusted teleporters and trusted reserves. #### Current limitations: - while `fees` and "non-fee" `assets` CAN have different reserves (or fees CAN be teleported), the remaining "non-fee" `assets` CANNOT, among themselves, have different reserve locations (this is also implicitly enforced by `MAX_ASSETS_FOR_TRANSFER=2`, but this can be safely increased in the future). - `fees` and "non-fee" `assets` CANNOT have **different remote** reserves (this could also be supported in the future, but adds even more complexity while possibly not being worth it - we'll see what the future holds). Fixes https://github.com/paritytech/polkadot-sdk/issues/1584 Fixes https://github.com/paritytech/polkadot-sdk/issues/2055 --------- Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com> Co-authored-by: Branislav Kontur <bkontur@gmail.com>
52 lines
1.7 KiB
Rust
52 lines
1.7 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Cumulus.
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// Cumulus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Cumulus is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Cumulus. If not, see <http://www.gnu.org/licenses/>.
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pub use bridge_hub_polkadot_runtime::{
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xcm_config::XcmConfig, AllPalletsWithoutSystem, Balances, ExistentialDeposit, ParachainSystem,
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PolkadotXcm, Runtime, RuntimeEvent, SessionKeys,
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};
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use codec::Decode;
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use frame_support::parameter_types;
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use parachains_common::{polkadot::fee::WeightToFee, AccountId, AuraId};
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const ALICE: [u8; 32] = [1u8; 32];
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parameter_types! {
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pub CheckingAccount: AccountId = PolkadotXcm::check_account();
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}
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bridge_hub_test_utils::test_cases::include_teleports_for_native_asset_works!(
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Runtime,
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AllPalletsWithoutSystem,
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XcmConfig,
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CheckingAccount,
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WeightToFee,
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ParachainSystem,
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bridge_hub_test_utils::CollatorSessionKeys::new(
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AccountId::from(ALICE),
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AccountId::from(ALICE),
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SessionKeys { aura: AuraId::from(sp_core::sr25519::Public::from_raw(ALICE)) }
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),
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ExistentialDeposit::get(),
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Box::new(|runtime_event_encoded: Vec<u8>| {
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match RuntimeEvent::decode(&mut &runtime_event_encoded[..]) {
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Ok(RuntimeEvent::PolkadotXcm(event)) => Some(event),
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_ => None,
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}
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}),
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1002
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);
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