mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-07-16 11:55:42 +00:00
Gavin Wood
636d0b030f
* XCM: Introduce AssetTrap * Revert reversions * Remove attempts at weighing and add test * Less storage use for asset trapping * Add missing file * Fixes * Fixes * Formatting * Fixes * Docs * Filter types to allow runtimes to dictate which assets/origins should be trapped * Formatting * Tests * Formatting * Fixes * Docs
80 lines
2.8 KiB
Rust
80 lines
2.8 KiB
Rust
// Copyright 2020 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot 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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// Polkadot 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 Polkadot. If not, see <http://www.gnu.org/licenses/>.
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use crate::Assets;
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use core::marker::PhantomData;
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use frame_support::{traits::Contains, weights::Weight};
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use xcm::latest::{MultiAssets, MultiLocation};
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/// Define a handler for when some non-empty `Assets` value should be dropped.
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pub trait DropAssets {
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/// Handler for receiving dropped assets. Returns the weight consumed by this operation.
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fn drop_assets(origin: &MultiLocation, assets: Assets) -> Weight;
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}
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impl DropAssets for () {
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fn drop_assets(_origin: &MultiLocation, _assets: Assets) -> Weight {
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0
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}
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}
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/// Morph a given `DropAssets` implementation into one which can filter based on assets. This can
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/// be used to ensure that `Assets` values which hold no value are ignored.
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pub struct FilterAssets<D, A>(PhantomData<(D, A)>);
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impl<D: DropAssets, A: Contains<Assets>> DropAssets for FilterAssets<D, A> {
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fn drop_assets(origin: &MultiLocation, assets: Assets) -> Weight {
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if A::contains(&assets) {
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D::drop_assets(origin, assets)
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} else {
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0
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}
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}
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}
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/// Morph a given `DropAssets` implementation into one which can filter based on origin. This can
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/// be used to ban origins which don't have proper protections/policies against misuse of the
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/// asset trap facility don't get to use it.
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pub struct FilterOrigin<D, O>(PhantomData<(D, O)>);
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impl<D: DropAssets, O: Contains<MultiLocation>> DropAssets for FilterOrigin<D, O> {
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fn drop_assets(origin: &MultiLocation, assets: Assets) -> Weight {
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if O::contains(origin) {
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D::drop_assets(origin, assets)
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} else {
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0
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}
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}
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}
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/// Define any handlers for the `AssetClaim` instruction.
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pub trait ClaimAssets {
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/// Claim any assets available to `origin` and return them in a single `Assets` value, together
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/// with the weight used by this operation.
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fn claim_assets(origin: &MultiLocation, ticket: &MultiLocation, what: &MultiAssets) -> bool;
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}
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#[impl_trait_for_tuples::impl_for_tuples(30)]
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impl ClaimAssets for Tuple {
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fn claim_assets(origin: &MultiLocation, ticket: &MultiLocation, what: &MultiAssets) -> bool {
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for_tuples!( #(
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if Tuple::claim_assets(origin, ticket, what) {
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return true;
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}
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)* );
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false
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}
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}
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