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Check out/in assets when teleporting to maintain total issuance (#3007)

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* Check out/in assets when teleporting to maintain total issuance

* Fixes

* Fixes

* Fixes

* Fixes

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

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Docs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Gavin Wood
2021-05-12 08:39:16 +02:00
committed by GitHub
parent c68903f3bb
commit 41a93127a9
9 changed files with 179 additions and 15 deletions
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polkadot/xcm/xcm-builder/src/fungibles_adapter.rs
+61 -9
View File
@@ -16,7 +16,7 @@
use sp_std::{prelude::*, result, marker::PhantomData, borrow::Borrow};
use xcm::v0::{Error as XcmError, Result, MultiAsset, MultiLocation, Junction};
use frame_support::traits::{Get, tokens::fungibles};
use frame_support::traits::{Get, tokens::fungibles, Contains};
use xcm_executor::traits::{TransactAsset, Convert};
/// Asset transaction errors.
@@ -160,15 +160,49 @@ impl<
}
}
pub struct FungiblesMutateAdapter<Assets, Matcher, AccountIdConverter, AccountId>(
PhantomData<(Assets, Matcher, AccountIdConverter, AccountId)>
pub struct FungiblesMutateAdapter<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>(
PhantomData<(Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount)>
);
impl<
Assets: fungibles::Mutate<AccountId>,
Matcher: MatchesFungibles<Assets::AssetId, Assets::Balance>,
AccountIdConverter: Convert<MultiLocation, AccountId>,
AccountId: Clone, // can't get away without it since Currency is generic over it.
> TransactAsset for FungiblesMutateAdapter<Assets, Matcher, AccountIdConverter, AccountId> {
CheckAsset: Contains<Assets::AssetId>,
CheckingAccount: Get<AccountId>,
> TransactAsset for FungiblesMutateAdapter<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount> {
fn can_check_in(_origin: &MultiLocation, what: &MultiAsset) -> Result {
// Check we handle this asset.
let (asset_id, amount) = Matcher::matches_fungibles(what)?;
if CheckAsset::contains(&asset_id) {
// This is an asset whose teleports we track.
let checking_account = CheckingAccount::get();
Assets::can_withdraw(asset_id, &checking_account, amount)
.into_result()
.map_err(|_| XcmError::NotWithdrawable)?;
}
Ok(())
}
fn check_in(_origin: &MultiLocation, what: &MultiAsset) {
if let Ok((asset_id, amount)) = Matcher::matches_fungibles(what) {
if CheckAsset::contains(&asset_id) {
let checking_account = CheckingAccount::get();
let ok = Assets::burn_from(asset_id, &checking_account, amount).is_ok();
debug_assert!(ok, "`can_check_in` must have returned `true` immediately prior; qed");
}
}
}
fn check_out(_dest: &MultiLocation, what: &MultiAsset) {
if let Ok((asset_id, amount)) = Matcher::matches_fungibles(what) {
if CheckAsset::contains(&asset_id) {
let checking_account = CheckingAccount::get();
let ok = Assets::mint_into(asset_id, &checking_account, amount).is_ok();
debug_assert!(ok, "`mint_into` cannot generally fail; qed");
}
}
}
fn deposit_asset(what: &MultiAsset, who: &MultiLocation) -> Result {
// Check we handle this asset.
@@ -193,25 +227,43 @@ impl<
}
}
pub struct FungiblesAdapter<Assets, Matcher, AccountIdConverter, AccountId>(
PhantomData<(Assets, Matcher, AccountIdConverter, AccountId)>
pub struct FungiblesAdapter<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>(
PhantomData<(Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount)>
);
impl<
Assets: fungibles::Mutate<AccountId> + fungibles::Transfer<AccountId>,
Matcher: MatchesFungibles<Assets::AssetId, Assets::Balance>,
AccountIdConverter: Convert<MultiLocation, AccountId>,
AccountId: Clone, // can't get away without it since Currency is generic over it.
> TransactAsset for FungiblesAdapter<Assets, Matcher, AccountIdConverter, AccountId> {
CheckAsset: Contains<Assets::AssetId>,
CheckingAccount: Get<AccountId>,
> TransactAsset for FungiblesAdapter<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount> {
fn can_check_in(origin: &MultiLocation, what: &MultiAsset) -> Result {
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>
::can_check_in(origin, what)
}
fn check_in(origin: &MultiLocation, what: &MultiAsset) {
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>
::check_in(origin, what)
}
fn check_out(dest: &MultiLocation, what: &MultiAsset) {
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>
::check_out(dest, what)
}
fn deposit_asset(what: &MultiAsset, who: &MultiLocation) -> Result {
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId>::deposit_asset(what, who)
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>
::deposit_asset(what, who)
}
fn withdraw_asset(
what: &MultiAsset,
who: &MultiLocation
) -> result::Result<xcm_executor::Assets, XcmError> {
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId>::withdraw_asset(what, who)
FungiblesMutateAdapter::<Assets, Matcher, AccountIdConverter, AccountId, CheckAsset, CheckingAccount>
::withdraw_asset(what, who)
}
fn transfer_asset(