XCM executor: refund unused swapped fees #7945
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mrshiposha
changed the title
acatangiu
reviewed
Mar 18, 2025
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| let (needed, change) = Self::get_fungible_needed_and_change( | ||
| swapped_asset, | ||
| &asset_needed_for_fees.id, | ||
| &asset_to_pay_for_fees.id, | ||
| ) | ||
| .ok_or(XcmError::FeesNotMet)?; | ||
|
|
||
| self.deposit_fee_asset(change, fees_source)?; |
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what is the scenario where there is leftover of the source asset after swapping to target asset?
I see that we are quoting the price just before doing the swap so it should be exact swap with no change.
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Ooph. Apparently, I got confused. Also, I was actually focused on another thing — simplifying the WeightTrader, where I wanted to use the AssetExchanger (I wanted this to allow general implementation of xcmPaymentApi.queryWeightToAssetFee, see the end of this comment).
I'm closing this PR.
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This PR changes the XCM executor to refund the unused swapped fees into the corresponding fees source (jit withdraw, holding register, or fees register).