x/gamm: Add fixed gas cost for swaps by rrrliu · Pull Request #2016 · osmosis-labs/osmosis

rrrliu · 2022-07-11T07:33:50Z

Closes: #1903

What is the purpose of the change

To further prevent spam, adds fixed amount of gas we consume per swap in/out. Previously we had only been consuming gas for built-in I/O (store reads and writes), and in the future we might make

Brief Changelog

Added new BalancerGasFeeForSwap constant + TODO comment to turn into param
Have swapExactAmountIn and swapExactAmountOut consume gas
Test this in swap_test.go

Testing and Verifying

This change added tests and can be verified as follows:

Added lines to test gas consumed in swap_test.go

Documentation and Release Note

Does this pull request introduce a new feature or user-facing behavior changes? (yes)
Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? yes
How is the feature or change documented? (not applicable / specification (x/<module>/spec/) / Osmosis docs repo / not documented)

alexanderbez · 2022-07-11T14:38:52Z

x/gamm/types/constants.go

 	// i.e. SigFigExponent = 8 is 10^8 which is 100000000. This gives 8 significant figures.
 	SigFigsExponent = 8
+	// TODO: Current fixed cost gas fee per swap -- turn this into a param in the future.
+	GasFeeForSwap = 10000


Is there a reason to not directly just make this a param?

We decided to make it a fixed cost for now to avoid needing to set up migration code for a change this small (#1903 (comment))

alexanderbez · 2022-07-11T14:39:19Z

x/gamm/keeper/swap.go

 	}
 	tokensIn := sdk.Coins{tokenIn}

+	ctx.GasMeter().ConsumeGas(types.GasFeeForSwap, "swap computation")


It feels safer to move the gas consumption to the top-most level of abstraction, i.e the msg handler for swapping.

I think it should be in each core loop here right, so that we scale by number of hops in a multi-hop?

(Also needs to be in swapExactAmountOut)

I guess really it should probably be defined per pool type

Thoughts on applying it right here: https://github.com/osmosis-labs/osmosis/blob/main/x/gamm/pool-models/balancer/pool.go#L585-L599 ?

That way we have it per Balancer swap, rather than per total swap. (And can then later charge a different gas amount for stableswap / next CFMM)

Yeah that makes sense, just updated! Should we update balancer pool docs with this or should we wait until it becomes a param?

x/gamm/types/constants.go

x/gamm/keeper/swap_test.go

mattverse

LGTM! Can we add a Changelog entry for this PR?

mattverse · 2022-07-13T11:28:31Z

Also out of curiousity, how was the constant 10000 decided?

p0mvn · 2022-07-13T15:37:35Z

x/gamm/types/constants.go

 	// Raise 10 to the power of SigFigsExponent to determine number of significant figures.
 	// i.e. SigFigExponent = 8 is 10^8 which is 100000000. This gives 8 significant figures.
 	SigFigsExponent = 8
+	// TODO: Turn this into a param in the future.


Great idea! Can we make an issue for this please and remove the comment?

Yes, issue please with a reference 👍

Created one! #2058

CHANGELOG.md

alexanderbez · 2022-07-13T17:08:52Z

x/gamm/types/constants.go

 	// Raise 10 to the power of SigFigsExponent to determine number of significant figures.
 	// i.e. SigFigExponent = 8 is 10^8 which is 100000000. This gives 8 significant figures.
 	SigFigsExponent = 8
+	// TODO: Turn this into a param in the future.


Yes, issue please with a reference 👍

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

rrrliu · 2022-07-15T04:56:11Z

Also out of curiousity, how was the constant 10000 decided?

@mattverse oh I just benchmarked the swap i/o gas and it was around ~40000, so decided to have it be something around the same order of magnitude. No strong opinion on this though so open to changing.

ValarDragon · 2022-07-15T12:27:23Z

Thanks for making this!

mattverse · 2022-07-15T16:13:29Z

@rrrliu ah gotcha thanks for explaining! Nice work done here!

* add gas for swap + test * test file comments * move swap consumption to balancer only * fix one more test case * add to changelog * Update CHANGELOG.md Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com> * rm TODO now that we have issue * underscore for clarity * gofmt Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

add gas for swap + test

557fac4

rrrliu requested a review from a team July 11, 2022 07:33

github-actions bot added the C:x/gamm Changes, features and bugs related to the gamm module. label Jul 11, 2022

alexanderbez reviewed Jul 11, 2022

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AlpinYukseloglu reviewed Jul 11, 2022

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x/gamm/types/constants.go Outdated Show resolved Hide resolved

x/gamm/keeper/swap_test.go Outdated Show resolved Hide resolved

rrrliu added 3 commits July 11, 2022 23:54

test file comments

88e6112

move swap consumption to balancer only

4bdfc68

fix one more test case

44abd66

rrrliu requested review from AlpinYukseloglu, ValarDragon and alexanderbez July 13, 2022 02:48

mattverse approved these changes Jul 13, 2022

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add to changelog

7eed0c3

github-actions bot added the C:docs Improvements or additions to documentation label Jul 13, 2022

p0mvn reviewed Jul 13, 2022

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alexanderbez reviewed Jul 13, 2022

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rrrliu and others added 5 commits July 14, 2022 00:29

Update CHANGELOG.md

5190924

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

rm TODO now that we have issue

df0f26b

underscore for clarity

5ea427f

gofmt

29ad32a

Merge branch 'main' into rrrliu/1903-charge-gas-for-computation

3cbb9dc

ValarDragon approved these changes Jul 15, 2022

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ValarDragon merged commit e9907ce into osmosis-labs:main Jul 17, 2022

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Revert fixed gas costs for swaps #2758

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rrrliu commented Jul 11, 2022 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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What is the purpose of the change

Brief Changelog

Testing and Verifying

Documentation and Release Note

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AlpinYukseloglu Jul 11, 2022 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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mattverse commented Jul 13, 2022

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rrrliu commented Jul 15, 2022

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rrrliu commented Jul 11, 2022 •

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AlpinYukseloglu Jul 11, 2022 •

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