use relaychain asset as fee #700

zqhxuyuan · 2022-02-22T01:17:58Z

checkout context infomation on: #698

for not breaking current semantic(don't allow different reserve), I use another disptach call instead mixed in do_transfer_multiassets. (i.e. may be need another paramether allow_different_reserve to implemented.)

the transfer_using_relaychain_as_fee only used for parachain(A) send token to sibling parachain(B), and use relaychain token(R) as fee. thus, the reserve location is decided by sibling asset instead of fee asset.

Edit:
for the case of transfer custom asset(RMRK) from Karura to Statemine, we current use two xcm implementation:

first one send to relaychain and route to Statemine(Karura-[KSM]-Statemine NonReserve case), transfer user's fee to parachain_2000 sovereign account on Statemine.
second one direct send to Statemine(Karura-[KSM,RMRK]-Statemine, ToReserve case)

~~we also has the case of transfer RMRK from Karura to Bifrost. this case also need use KSM as fee too.~~

acala statemine tests: AcalaNetwork/Acala#1712

codecov-commenter · 2022-02-22T05:57:17Z

Codecov Report

Merging #700 (cadcc9f) into master (aac79b3) will increase coverage by 0.40%.
The diff coverage is 83.40%.

@@            Coverage Diff             @@
##           master     #700      +/-   ##
==========================================
+ Coverage   74.99%   75.39%   +0.40%     
==========================================
  Files          83       83              
  Lines        7266     7438     +172     
==========================================
+ Hits         5449     5608     +159     
- Misses       1817     1830      +13

Impacted Files	Coverage Δ
xtokens/src/mock/mod.rs	`89.28% <50.00%> (-3.03%)`	⬇️
xtokens/src/lib.rs	`63.93% <62.76%> (+2.60%)`	⬆️
xtokens/src/mock/para.rs	`75.75% <100.00%> (+2.42%)`	⬆️
xtokens/src/tests.rs	`99.35% <100.00%> (+0.14%)`	⬆️

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shaunxw

I would recommend to update transfer_with_fee impl instead of adding a new dispatchable call.

The new transfer_using_relaychain_as_fee is basically the same with do_transfer_multiassets, but it doesn't require fee and other assets share the same reserve, plus it use non-fee assets as reserve.

Updating do_transfer_multiassets and make it

Only ensure non-fee assets share the same reserve location.
Refer to non-fee assets for reserve location.

should work. As it only extends use cases of it with less limitations, it's not a breaking change for transfer_with_fee.

xtokens/src/lib.rs

xtokens/src/mock/para.rs

zqhxuyuan · 2022-02-23T01:47:19Z

Only ensure non-fee assets share the same reserve location.
Refer to non-fee assets for reserve location.

That make sense, but I think change transfer_with_fee will break existing case, i.e.

open-runtime-module-library/xtokens/src/tests.rs

Lines 310 to 315 in f8f6f82

    
           ParaA::execute_with(|| { 
        
           	assert_ok!(ParaXTokens::transfer_with_fee( 
        
           		Some(ALICE).into(), 
        
           		CurrencyId::B, 
        
           		450, 
        
           		50,

transfer_with_fee only support one asset and use that asset as fee. If we want to use relaychain asset as fee and transfer another asset, I think we need to change transfer_multiasset_with_fee or transfer_multicurrencies or transfer_multiassets.

shaunxw · 2022-02-23T02:28:25Z

That make sense, but I think change transfer_with_fee will break existing case, i.e.

My bad, I mean the new updated impl which can specify fee asset type. Updating do_transfer_multiassets impl should work and won't break any existing call.

shaunxw

DistinctReserveForAssetAndFee error variant should be removed, as there is not such limitation any more.

xtokens/src/lib.rs

zqhxuyuan · 2022-02-25T06:55:33Z

I think DistinctReserveForAssetAndFee still needed, because there maybe case like [R,A,A1] which is valid, but [R,A,B] is invalid.

xtokens/src/lib.rs

This reverts commit aac79b3.

xtokens/src/lib.rs

shaunxw · 2022-03-01T22:30:42Z

xtokens/src/lib.rs

+				// destination chain, which asset is originated from sender account on sender
+				// chain. This means if user setup too much fee, the fee is not returned to
+				// user, instead deposit to sibling parachain sovereign account on dest chain.
+				// Notice: if parachain set `SelfLocation` to (0, Here), it'll be error!


This should be documented in SelfLocation definition.

move to README

shaunxw · 2022-03-01T22:31:06Z

xtokens/src/lib.rs

+				// Current not ensure xcm order delivery. if second xcm is executed before first
+				// xcm, then second xcm may failed because of sibling parachain account don't
+				// have enough fee to withdraw. we can pre-fund some amount to sibling parachain
+				// sovereign account to fix this issue. when first xcm executed later on, the
+				// sibling sovereign parachain account is deposit. and next transaction will
+				// succeed even though second xcm is executed before first xcm if user fee is
+				// less than parachain sovereign account balance.


Dispatchable calls docstring or pallet readme should include these usage notes.

move to README

xtokens/src/lib.rs

shaunxw · 2022-03-01T22:35:39Z

xtokens/src/lib.rs

+		}
+
+		/// Send xcm with given assets and fee to dest or reserve chain.
+		fn send_xcm(


need a better naming

rename to execute_and_send_reserve_kind_xcm

xtokens/src/lib.rs

shaunxw · 2022-03-01T22:46:38Z

xtokens/src/lib.rs

@@ -813,3 +920,18 @@ fn half(asset: &MultiAsset) -> MultiAsset {
 		id: asset.id.clone(),
 	}
 }
+
+fn subtract_fee(asset: &MultiAsset, amount: u128) -> MultiAsset {
+	let final_amount = fungible_amount(asset).checked_sub(amount).expect("fee too low; qed");


There is no fee_amount >= min_xcm_fee check. This could panic no?

we checked before subtract, so it's ok here I think

// min xcm fee should less than user fee let fee_to_dest: MultiAsset = (fee.id.clone(), min_xcm_fee).into(); ensure!(fee_to_dest < fee, Error::<T>::InvalidAsset);

This reverts commit dba578f.

* origin/master: use relaychain asset as fee (#700) Polkadot v0.9.17 (#705) XTokens refactor (#706) Add a test for cliff vesting (#702) Girazoki fix index in transfer multicurrencies (#696)

zqhxuyuan added 2 commits February 21, 2022 18:02

support relaychain as fee

69165e6

add weight

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zqhxuyuan requested review from shaunxw and xlc February 22, 2022 05:16

zqhxuyuan added 2 commits February 22, 2022 13:17

clean and comment

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clean

9344a77

zqhxuyuan marked this pull request as ready for review February 22, 2022 05:31

zqhxuyuan mentioned this pull request Feb 22, 2022

Statemine integration test AcalaNetwork/Acala#1712

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zqhxuyuan added 4 commits February 23, 2022 14:39

use non fee asset as reserve

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update

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clippy

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update weight

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shaunxw reviewed Feb 23, 2022

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zqhxuyuan added 2 commits February 24, 2022 15:59

too many fee

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two xcm and split fee

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zqhxuyuan added 7 commits February 25, 2022 15:15

clean

281bef4

fix tests

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more test

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clippy

dbfc6e6

fmt

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remove FeeNotEnough

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clean

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add parachain min fee setting

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merge master

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zqhxuyuan added 2 commits February 28, 2022 18:09

more test and some limitation

085806b

some notes

69acc52

zqhxuyuan changed the title ~~Different fee reserve~~ use relaychain asset as fee to transfer asset back to Statemine Feb 28, 2022

zqhxuyuan added 3 commits February 28, 2022 20:24

fmt

662981c

Revert "Polkadot v0.9.17 (#705)"

dba578f

This reverts commit aac79b3.

update comments

83e0304

zqhxuyuan changed the title ~~use relaychain asset as fee to transfer asset back to Statemine~~ use relaychain asset as fee Mar 1, 2022

zqhxuyuan commented Mar 1, 2022

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zqhxuyuan added 3 commits March 2, 2022 11:37

Revert "Revert "Polkadot v0.9.17 (#705)""

cf3d8aa

This reverts commit dba578f.

fix

a2d1de5

update README and add FeeNotEnough Error

cadcc9f

shaunxw approved these changes Mar 3, 2022

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shaunxw merged commit 0a5a2df into master Mar 3, 2022

shaunxw deleted the different_fee_reserve branch March 3, 2022 09:01

ghost mentioned this pull request Mar 22, 2022

Asset-manager for foreign xcm related assets parallel-finance/parallel#1450

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xlc mentioned this pull request Mar 25, 2022

support using KSM as fee(cases: transfer back asset to Statemine) #698

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use relaychain asset as fee #700

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use relaychain asset as fee #700

use relaychain asset as fee #700

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