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feat: prune abandoned state #185

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Description

By introducing reference counting similar to the x/distribution module, we can safely prune abandoned state
like no longer used HistoricalRewards, OutstandingRewards, CurrentEpoch, ....

closes: #142

References

See: F1 Fee Distribution Paper's 3. State Requirements for details about state pruning using reference counting.


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  • Appropriate labels applied
  • Targeted PR against correct branch
  • Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
  • Code follows the module structure standards.
  • Wrote unit and integration
  • Updated relevant documentation (docs/) or specification (x/<module>/spec/)
  • Added relevant godoc comments.
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  • Review Codecov Report in the comment section below once CI passes

@hallazzang hallazzang self-assigned this Oct 21, 2021
@hallazzang hallazzang marked this pull request as ready for review November 10, 2021 06:45
…e-state

# Conflicts:
#	x/farming/keeper/invariants_test.go
#	x/farming/keeper/keeper_test.go
#	x/farming/keeper/reward_test.go
#	x/farming/keeper/staking_test.go
x/farming/keeper/reward.go Outdated Show resolved Hide resolved
@dongsam dongsam self-requested a review November 12, 2021 09:22
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I think there are some errors in the current method (if there are multiple stakings for the same staking denom and add staking, withdrawing) I think there will be not enough time to review and correct it in this v1.0.0-rc1 release, so it seems necessary to correct it more meticulously in the next sprint.

…e-state

# Conflicts:
#	x/farming/keeper/staking.go
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dongsam commented Nov 26, 2021

LGTM, Thank you for fixing logic and adding detailed test code. As a result of internal discussions, we think that the PR is not essential for this release, so we will include it in the next release.

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feat: Prune states when data is no longer needed
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