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[pallet-xcm] fix transport fees for remote reserve transfers #3792

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girazoki
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Currently transfer_assets from pallet-xcm covers 4 main different transfer types:

  • localReserve
  • DestinationReserve
  • Teleport
  • RemoteReserve

For the first three, the local execution and the remote message sending are separated, and fees are deducted in pallet-xcm itself:

Self::charge_fees(origin.clone(), price).map_err(|error| {
.

For the 4th case RemoteReserve, pallet-xcm is still relying on the xcm-executor itself to send the message (through the initiateReserveWithdraw instruction). In this case, if delivery fees need to be charged, it is not possible to do so because the jit_withdraw mode has not being set.

This PR proposes to still use the initiateReserveWithdraw but prepending a setFeesMode { jit_withdraw: true } to make sure delivery fees can be paid.

A test-case is also added to present the aforementioned case

@girazoki girazoki requested a review from a team as a code owner March 22, 2024 09:57
@acatangiu acatangiu added the T6-XCM This PR/Issue is related to XCM. label Mar 22, 2024
@acatangiu
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Good catch! Seems this was missed in emulated tests because Penpal still has free message delivery 🤦

Let me add an emulated transfer regression test as well 👍

@acatangiu
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In the meantime, can you please add a prdoc for documenting the fix in the changelog?
Example(s) here: https://github.com/paritytech/polkadot-sdk/blob/master/prdoc/pr_3740.prdoc

acatangiu added a commit that referenced this pull request Mar 22, 2024
Add `SetFeesMode { jit_withdraw: true }` before
`InitiateReserveWithdraw` instruction to allow paying JIT fees in the
executor.

This is backport of #3792
@girazoki
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In the meantime, can you please add a prdoc for documenting the fix in the changelog? Example(s) here: https://github.com/paritytech/polkadot-sdk/blob/master/prdoc/pr_3740.prdoc

Absolutely!

@acatangiu acatangiu changed the title Add set fees mode initiate reserve withdraw pallet-xcm: fix transport fees for remote reserve transfers Mar 22, 2024
@acatangiu
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I added regression tests PR (to merge with this PR): girazoki#1

@girazoki PTAL and let's merge those to this PR so this PR is complete with fix and regression tests.

@acatangiu acatangiu requested a review from a team March 22, 2024 14:01
@girazoki
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Merged @acatangiu

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The CI pipeline was cancelled due to failure one of the required jobs.
Job name: cargo-clippy
Logs: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/5621324

@girazoki girazoki changed the title pallet-xcm: fix transport fees for remote reserve transfers [pallet-xcm] fix transport fees for remote reserve transfers Mar 22, 2024
@girazoki
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@acatangiu I dont know how to fix the prdoc failure now :(, do I need to put the title in between quotes?

@acatangiu acatangiu enabled auto-merge March 22, 2024 18:47
@acatangiu acatangiu added this pull request to the merge queue Mar 22, 2024
Merged via the queue into paritytech:master with commit 9a04ebb Mar 22, 2024
128 of 133 checks passed
dharjeezy pushed a commit to dharjeezy/polkadot-sdk that referenced this pull request Mar 24, 2024
…ech#3792)

Currently `transfer_assets` from pallet-xcm covers 4 main different
transfer types:
- `localReserve`
- `DestinationReserve`
- `Teleport`
- `RemoteReserve`

For the first three, the local execution and the remote message sending
are separated, and fees are deducted in pallet-xcm itself:
https://github.com/paritytech/polkadot-sdk/blob/3410dfb3929462da88be2da813f121d8b1cf46b3/polkadot/xcm/pallet-xcm/src/lib.rs#L1758.

For the 4th case `RemoteReserve`, pallet-xcm is still relying on the
xcm-executor itself to send the message (through the
`initiateReserveWithdraw` instruction). In this case, if delivery fees
need to be charged, it is not possible to do so because the
`jit_withdraw` mode has not being set.

This PR proposes to still use the `initiateReserveWithdraw` but
prepending a `setFeesMode { jit_withdraw: true }` to make sure delivery
fees can be paid.

A test-case is also added to present the aforementioned case

---------

Co-authored-by: Adrian Catangiu <[email protected]>
girazoki added a commit to moondance-labs/polkadot-sdk that referenced this pull request Mar 26, 2024
bkontur pushed a commit that referenced this pull request Mar 26, 2024
Add `SetFeesMode { jit_withdraw: true }` before
`InitiateReserveWithdraw` instruction to allow paying JIT fees in the
executor.

This is backport of #3792
bkontur pushed a commit that referenced this pull request Mar 26, 2024
Add `SetFeesMode { jit_withdraw: true }` before
`InitiateReserveWithdraw` instruction to allow paying JIT fees in the
executor.

This is backport of #3792
acatangiu added a commit that referenced this pull request Mar 26, 2024
… backport for 1.8 (#3839)

This is backport of #3792

Expected patches for:
- pallet-xcm

---------

Co-authored-by: Adrian Catangiu <[email protected]>
acatangiu added a commit that referenced this pull request Mar 26, 2024
… backport for 1.9 (#3840)

This is backport of #3792

Expected patches for:
- pallet-xcm

Co-authored-by: Adrian Catangiu <[email protected]>
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4 participants