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Remove destination parachain transfer #179

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Sep 11, 2024
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Remove destination parachain transfer #179

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76 changes: 20 additions & 56 deletions bridges/snowbridge/primitives/router/src/inbound/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,8 @@ impl<
ConvertAssetId,
EthereumUniversalLocation,
GlobalAssetHubLocation,
> where
>
where
CreateAssetCall: Get<CallIndex>,
CreateAssetDeposit: Get<u128>,
InboundQueuePalletInstance: Get<u8>,
Expand Down Expand Up @@ -226,7 +227,8 @@ impl<
ConvertAssetId,
EthereumUniversalLocation,
GlobalAssetHubLocation,
> where
>
where
CreateAssetCall: Get<CallIndex>,
CreateAssetDeposit: Get<u128>,
InboundQueuePalletInstance: Get<u8>,
Expand Down Expand Up @@ -396,20 +398,19 @@ impl<
let network = Ethereum { chain_id };
let asset_hub_fee_asset: Asset = (Location::parent(), asset_hub_fee).into();

let (dest_para_id, beneficiary, dest_para_fee) = match destination {
let beneficiary = match destination {
// Final destination is a 32-byte account on AssetHub
Destination::AccountId32 { id } =>
(None, Location::new(0, [AccountId32 { network: None, id }]), 0),
Location::new(0, [AccountId32 { network: None, id }]),
// Final destination is a 32-byte account on a sibling of AssetHub
Destination::ForeignAccountId32 { para_id, id, fee } =>
(Some(para_id), Location::new(0, [AccountId32 { network: None, id }]), fee),
Destination::ForeignAccountId32 { para_id, id, .. } =>
Location::new(0, [AccountId32 { network: None, id }]),
// Final destination is a 20-byte account on a sibling of AssetHub
Destination::ForeignAccountId20 { para_id, id, fee } =>
(Some(para_id), Location::new(0, [AccountKey20 { network: None, key: id }]), fee),
Destination::ForeignAccountId20 { para_id, id, .. } =>
Location::new(0, [AccountKey20 { network: None, key: id }]),
Comment on lines 408 to +410
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@yrong yrong Sep 11, 2024 •
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This branch seems not nessessary?

};

let total_fees = asset_hub_fee.saturating_add(dest_para_fee);
let total_fee_asset: Asset = (Location::parent(), total_fees).into();
let total_fee_asset: Asset = (Location::parent(), asset_hub_fee).into();

let asset_loc =
ConvertAssetId::convert(&token_id).ok_or(ConvertMessageError::InvalidToken)?;
Expand All @@ -423,61 +424,24 @@ impl<

let inbound_queue_pallet_index = InboundQueuePalletInstance::get();

let mut instructions = vec![
let bridge_location = Location::new(2, GlobalConsensus(network));

let instructions = vec![
ReceiveTeleportedAsset(total_fee_asset.clone().into()),
BuyExecution { fees: asset_hub_fee_asset, weight_limit: Unlimited },
DescendOrigin(PalletInstance(inbound_queue_pallet_index).into()),
UniversalOrigin(GlobalConsensus(network)),
WithdrawAsset(asset.clone().into()),
// Deposit both asset and fees to beneficiary so the fees will not get
// trapped. Another benefit is when fees left more than ED on AssetHub could be
// used to create the beneficiary account in case it does not exist.
DepositAsset { assets: Wild(AllCounted(2)), beneficiary },
SetTopic(message_id.into()),
];

let bridge_location = Location::new(2, GlobalConsensus(network));

match dest_para_id {
Some(dest_para_id) => {
let dest_para_fee_asset: Asset = (Location::parent(), dest_para_fee).into();

instructions.extend(vec![
// `SetAppendix` ensures that `fees` are not trapped in any case
SetAppendix(Xcm(vec![DepositAsset {
assets: AllCounted(2).into(),
beneficiary: bridge_location,
}])),
// Perform a reserve withdraw to send to destination chain. Leave half of the
// asset_hub_fee for the delivery cost
InitiateReserveWithdraw {
assets: Definite(
vec![asset.clone(), (Location::parent(), dest_para_fee).into()].into(),
),
reserve: Location::new(1, [Parachain(dest_para_id)]),
xcm: vec![
// Buy execution on target.
BuyExecution { fees: dest_para_fee_asset, weight_limit: Unlimited },
// Deposit asset and fee to beneficiary.
DepositAsset { assets: Wild(AllCounted(2)), beneficiary },
// Forward message id to destination parachain.
SetTopic(message_id.into()),
]
.into(),
},
]);
},
None => {
instructions.extend(vec![
// Deposit both asset and fees to beneficiary so the fees will not get
// trapped. Another benefit is when fees left more than ED on AssetHub could be
// used to create the beneficiary account in case it does not exist.
DepositAsset { assets: Wild(AllCounted(2)), beneficiary },
]);
},
}

// Forward message id to Asset Hub.
instructions.push(SetTopic(message_id.into()));

// `total_fees` to burn on this chain when sending `instructions` to run on AH (which also
// teleport fees)
Ok((instructions.into(), total_fees.into()))
Ok((instructions.into(), asset_hub_fee.into()))
}
}

Expand Down
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