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eip-7251: New compute_consolidation_epoch_and_update_churn #13981

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prestonvanloon
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What type of PR is this?

Feature

What does this PR do? Why is it needed?

Extracted from #13903.

This PR implements new spec method compute_consolidation_epoch_and_update_churn in electra.

Which issues(s) does this PR fix?

Tracking @ #13849

Other notes for review

https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/electra/beacon-chain.md#new-compute_consolidation_epoch_and_update_churn

beacon-chain/core/electra/churn.go Outdated Show resolved Hide resolved
// Consolidation doesn't fit in the current earliest epoch.
if consolidationBalance > consolidationBalanceToConsume {
balanceToProcess := consolidationBalance - consolidationBalanceToConsume
// additional_epochs = (balance_to_process - 1) // per_epoch_consolidation_churn + 1
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Do we intend to leave // additional_epochs = (balance_to_process - 1) // per_epoch_consolidation_churn + 1 here?

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there's a ++ below

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no, I meant the python comment in general

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Yes, I left the python code here because this line is a bit confusing where the division and addition are several lines apart.

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My only comment is with regards to the spec, It smells to me that there's a function that explicitlyhas two separate concerns, there's the code logic to compute the consodation epoch and update the churn, I would have preferred two separate helpers for this. We could implement it this way internally.

beacon-chain/core/electra/churn.go Outdated Show resolved Hide resolved
}
additionalEpochs++
earliestConsolidationEpoch += primitives.Epoch(additionalEpochs)
consolidationBalanceToConsume += math.Gwei(additionalEpochs) * perEpochConsolidationChurn
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Not from this PR but I find it funny that Gwei is defined in the math package.

beacon-chain/core/electra/churn.go Outdated Show resolved Hide resolved
tests for compute_consolidation_epoch_and_update_churn
@prestonvanloon prestonvanloon force-pushed the eip-7251-compute_consolidation_epoch_and_update_churn branch from e5d71cf to 9026515 Compare May 11, 2024 15:03
@prestonvanloon prestonvanloon added this pull request to the merge queue May 13, 2024
Merged via the queue into develop with commit e28b669 May 13, 2024
16 of 17 checks passed
@prestonvanloon prestonvanloon deleted the eip-7251-compute_consolidation_epoch_and_update_churn branch May 13, 2024 14:40
ErnestK pushed a commit to ErnestK/prysm that referenced this pull request May 19, 2024
…ysmaticlabs#13981)

tests for compute_consolidation_epoch_and_update_churn

Co-authored-by: james-prysm <[email protected]>
nisdas pushed a commit that referenced this pull request Jul 4, 2024
…3981)

tests for compute_consolidation_epoch_and_update_churn

Co-authored-by: james-prysm <[email protected]>
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4 participants