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638-Allow next leadership-schedule at 4k/f #639

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Sep 20, 2024
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638-Allow next leadership-schedule at 4k/f #639

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7 changes: 6 additions & 1 deletion cardano-api/internal/Cardano/Api/LedgerState.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -1792,14 +1792,19 @@ nextEpochEligibleLeadershipSlots sbe sGen serCurrEpochState ptclState poolid (Vr
Slot.epochInfoRange eInfo (currentEpoch `Slot.addEpochInterval` Slot.EpochInterval 1)

-- First we check if we are within 3k/f slots of the end of the current epoch.
-- In Conway era onwards, we use 4k/f slots instead of 3k/f slots.
-- see: https://ouroboros-consensus.cardano.intersectmbo.org/docs/for-developers/Glossary#epoch-structure
-- Why? Because the stake distribution is stable at this point.
-- k is the security parameter
-- f is the active slot coefficient
let stabilityWindowR :: Rational
stabilityWindowR = fromIntegral (3 * sgSecurityParam sGen) / Ledger.unboundRational (sgActiveSlotsCoeff sGen)
stabilityWindowR =
fromIntegral (stabilityWindowConst * sgSecurityParam sGen)
/ Ledger.unboundRational (sgActiveSlotsCoeff sGen)
stabilityWindowSlots :: SlotNo
stabilityWindowSlots = fromIntegral @Word64 $ floor $ fromRational @Double stabilityWindowR
stableStakeDistribSlot = currentEpochLastSlot - stabilityWindowSlots
stabilityWindowConst = caseShelleyToBabbageOrConwayEraOnwards (const 3) (const 4) sbe

case cTip of
ChainTipAtGenesis -> Left LeaderErrGenesisSlot
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