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Avoid bad pattern of wildcard fees (#3578)

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* Avoid bad pattern of wildcard fees

* spelling

* fmt

* Fix runtimes

* spelling
This commit is contained in:
Gavin Wood
2021-08-05 17:44:34 +02:00
committed by GitHub
parent fe5c303893
commit 00d6fc5af0
8 changed files with 51 additions and 10 deletions
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polkadot/xcm/pallet-xcm/src/lib.rs
+20 -3
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@@ -38,7 +38,7 @@ pub mod pallet {
use frame_support::pallet_prelude::*;
use frame_system::pallet_prelude::*;
use sp_runtime::traits::AccountIdConversion;
use xcm_executor::traits::WeightBounds;
use xcm_executor::traits::{InvertLocation, WeightBounds};
#[pallet::pallet]
#[pallet::generate_store(pub(super) trait Store)]
@@ -76,6 +76,9 @@ pub mod pallet {
/// Means of measuring the weight consumed by an XCM message locally.
type Weigher: WeightBounds<Self::Call>;
/// Means of inverting a location.
type LocationInverter: InvertLocation;
}
#[pallet::event]
@@ -93,6 +96,10 @@ pub mod pallet {
Filtered,
/// The message's weight could not be determined.
UnweighableMessage,
/// The assets to be sent are empty.
Empty,
/// Could not reanchor the assets to declare the fees for the destination chain.
CannotReanchor,
}
#[pallet::hooks]
@@ -115,6 +122,8 @@ pub mod pallet {
/// Teleport some assets from the local chain to some destination chain.
///
/// Fee payment on the destination side is made from the first asset listed in the `assets` vector.
///
/// - `origin`: Must be capable of withdrawing the `assets` and executing XCM.
/// - `dest`: Destination context for the assets. Will typically be `X2(Parent, Parachain(..))` to send
/// from parachain to parachain, or `X1(Parachain(..))` to send from relay to parachain.
@@ -146,6 +155,9 @@ pub mod pallet {
let value = (origin_location, assets);
ensure!(T::XcmTeleportFilter::contains(&value), Error::<T>::Filtered);
let (origin_location, assets) = value;
let inv_dest = T::LocationInverter::invert_location(&dest);
let mut fees = assets.first().ok_or(Error::<T>::Empty)?.clone();
fees.reanchor(&inv_dest).map_err(|_| Error::<T>::CannotReanchor)?;
let mut message = Xcm::WithdrawAsset {
assets,
effects: vec![InitiateTeleport {
@@ -153,7 +165,7 @@ pub mod pallet {
dest,
effects: vec![
BuyExecution {
fees: All,
fees,
// Zero weight for additional XCM (since there are none to execute)
weight: 0,
debt: dest_weight,
@@ -175,6 +187,8 @@ pub mod pallet {
/// Transfer some assets from the local chain to the sovereign account of a destination chain and forward
/// a notification XCM.
///
/// Fee payment on the destination side is made from the first asset listed in the `assets` vector.
///
/// - `origin`: Must be capable of withdrawing the `assets` and executing XCM.
/// - `dest`: Destination context for the assets. Will typically be `X2(Parent, Parachain(..))` to send
/// from parachain to parachain, or `X1(Parachain(..))` to send from relay to parachain.
@@ -203,12 +217,15 @@ pub mod pallet {
let value = (origin_location, assets);
ensure!(T::XcmReserveTransferFilter::contains(&value), Error::<T>::Filtered);
let (origin_location, assets) = value;
let inv_dest = T::LocationInverter::invert_location(&dest);
let mut fees = assets.first().ok_or(Error::<T>::Empty)?.clone();
fees.reanchor(&inv_dest).map_err(|_| Error::<T>::CannotReanchor)?;
let mut message = Xcm::TransferReserveAsset {
assets,
dest,
effects: vec![
BuyExecution {
fees: All,
fees,
// Zero weight for additional XCM (since there are none to execute)
weight: 0,
debt: dest_weight,