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[pallet-xcm] Adjust benchmarks (teleport_assets/reserve_transfer_assets) not relying on ED (#3464)

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## Problem
During the bumping of the `polkadot-fellows` repository to
`polkadot-sdk@1.6.0`, I encountered a situation where the benchmarks
`teleport_assets` and `reserve_transfer_assets` in AssetHubKusama
started to fail. This issue arose due to a decreased ED balance for
AssetHubs introduced
[here](https://github.com/polkadot-fellows/runtimes/pull/158/files#diff-80668ff8e793b64f36a9a3ec512df5cbca4ad448c157a5d81abda1b15f35f1daR213),
and also because of a [missing CI
pipeline](https://github.com/polkadot-fellows/runtimes/issues/197) to
check the benchmarks, which went unnoticed.

These benchmarks expect the `caller` to have enough:
1. balance to transfer (BTT)
2. balance for paying delivery (BFPD).
 
So the initial balance was calculated as `ED * 100`, which seems
reasonable:
```
const ED_MULTIPLIER: u32 = 100;
let balance = existential_deposit.saturating_mul(ED_MULTIPLIER.into());`
```
The problem arises when the price for delivery is 100 times higher than
the existential deposit. In other words, when `ED * 100` does not cover
`BTT` + `BFPD`.

I check AHR/AHW/AHK/AHP and this problem has only AssetHubKusama
```
ED: 3333333
calculated price to parent delivery:  1031666634  (from xcm logs from the benchmark)
---

3333333 * 100 - BTT(3333333) - BFPD(1031666634) = −701666667
```
which results in the error;
```
2024-02-23 09:19:42 Unable to charge fee with error Module(ModuleError { index: 31, error: [17, 0, 0, 0], message: Some("FeesNotMet") })
Error: Input("Benchmark pallet_xcm::reserve_transfer_assets failed: FeesNotMet")
     
```

## Solution

The benchmarks `teleport_assets` and `reserve_transfer_assets` were
fixed by removing `ED * 100` and replacing it with `DeliveryHelper`
logic, which calculates the (almost real) price for delivery and sets it
along with the existential deposit as the initial balance for the
account used in the benchmark.


## TODO

- [ ] patch for 1.6 -
https://github.com/paritytech/polkadot-sdk/pull/3466
- [ ] patch for 1.7 -
https://github.com/paritytech/polkadot-sdk/pull/3465
- [ ] patch for 1.8 - TODO: PR

---------

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
This commit is contained in:
Branislav Kontur
2024-02-26 09:12:28 +01:00
committed by GitHub
parent b9c792a4b8
commit 3d9439f646
28 changed files with 329 additions and 136 deletions
Download Patch File Download Diff File Expand all files Collapse all files
polkadot/runtime/westend/src/lib.rs
+33 -13
View File
@@ -2344,7 +2344,36 @@ sp_api::impl_runtime_apis! {
impl pallet_session_benchmarking::Config for Runtime {}
impl pallet_offences_benchmarking::Config for Runtime {}
impl pallet_election_provider_support_benchmarking::Config for Runtime {}
use xcm_config::{AssetHub, TokenLocation};
parameter_types! {
pub ExistentialDepositAsset: Option<Asset> = Some((
TokenLocation::get(),
ExistentialDeposit::get()
).into());
pub AssetHubParaId: ParaId = westend_runtime_constants::system_parachain::ASSET_HUB_ID.into();
pub const RandomParaId: ParaId = ParaId::new(43211234);
}
impl pallet_xcm::benchmarking::Config for Runtime {
type DeliveryHelper = (
runtime_common::xcm_sender::ToParachainDeliveryHelper<
xcm_config::XcmConfig,
ExistentialDepositAsset,
xcm_config::PriceForChildParachainDelivery,
AssetHubParaId,
(),
>,
runtime_common::xcm_sender::ToParachainDeliveryHelper<
xcm_config::XcmConfig,
ExistentialDepositAsset,
xcm_config::PriceForChildParachainDelivery,
RandomParaId,
(),
>
);
fn reachable_dest() -> Option<Location> {
Some(crate::xcm_config::AssetHub::get())
}
@@ -2352,7 +2381,7 @@ sp_api::impl_runtime_apis! {
fn teleportable_asset_and_dest() -> Option<(Asset, Location)> {
// Relay/native token can be teleported to/from AH.
Some((
Asset { fun: Fungible(EXISTENTIAL_DEPOSIT), id: AssetId(Here.into()) },
Asset { fun: Fungible(ExistentialDeposit::get()), id: AssetId(Here.into()) },
crate::xcm_config::AssetHub::get(),
))
}
@@ -2361,10 +2390,10 @@ sp_api::impl_runtime_apis! {
// Relay can reserve transfer native token to some random parachain.
Some((
Asset {
fun: Fungible(EXISTENTIAL_DEPOSIT),
fun: Fungible(ExistentialDeposit::get()),
id: AssetId(Here.into())
},
crate::Junction::Parachain(43211234).into(),
crate::Junction::Parachain(RandomParaId::get().into()).into(),
))
}
@@ -2391,15 +2420,6 @@ sp_api::impl_runtime_apis! {
AssetId, Fungibility::*, InteriorLocation, Junction, Junctions::*,
Asset, Assets, Location, NetworkId, Response,
};
use xcm_config::{AssetHub, TokenLocation};
parameter_types! {
pub ExistentialDepositAsset: Option<Asset> = Some((
TokenLocation::get(),
ExistentialDeposit::get()
).into());
pub ToParachain: ParaId = westend_runtime_constants::system_parachain::ASSET_HUB_ID.into();
}
impl pallet_xcm_benchmarks::Config for Runtime {
type XcmConfig = xcm_config::XcmConfig;
@@ -2408,7 +2428,7 @@ sp_api::impl_runtime_apis! {
xcm_config::XcmConfig,
ExistentialDepositAsset,
xcm_config::PriceForChildParachainDelivery,
ToParachain,
AssetHubParaId,
(),
>;
fn valid_destination() -> Result<Location, BenchmarkError> {
polkadot/runtime/westend/src/xcm_config.rs
+1 -1
View File
@@ -262,7 +262,7 @@ pub type LocalPalletOriginToLocation = (
StakingAdminToPlurality,
// FellowshipAdmin origin to be used in XCM as a corresponding Plurality `Location` value.
FellowshipAdminToPlurality,
// `Treasurer` origin to be used in XCM as a corresponding Plurality `MultiLocation` value.
// `Treasurer` origin to be used in XCM as a corresponding Plurality `Location` value.
TreasurerToPlurality,
);