import std/tables, stew/results, web3/ethtypes, ../datatypes/base type Entry = object recipient: Eth1Address addedAt: Epoch DynamicFeeRecipientsStore* = object mappings: Table[ValidatorIndex, Entry] func init*(T: type DynamicFeeRecipientsStore): T = T(mappings: initTable[ValidatorIndex, Entry]()) func addMapping*(store: var DynamicFeeRecipientsStore, validator: ValidatorIndex, feeRecipient: Eth1Address, currentEpoch: Epoch) = store.mappings[validator] = Entry(recipient: feeRecipient, addedAt: currentEpoch) func getDynamicFeeRecipient*(store: var DynamicFeeRecipientsStore, validator: ValidatorIndex, currentEpoch: Epoch): Opt[Eth1Address] = store.mappings.withValue(validator, entry) do: # https://ethereum.github.io/beacon-APIs/#/ValidatorRequiredApi/prepareBeaconProposer # # The information supplied for each validator index will persist # through the epoch in which the call is submitted and for a further # two epochs after that, or until the beacon node restarts. # # It is expected that validator clients will send this information # periodically, for example each epoch, to ensure beacon nodes have # correct and timely fee recipient information. return if (currentEpoch - entry.addedAt) > 2: err() else: ok entry.recipient do: return err() func pruneOldMappings*(store: var DynamicFeeRecipientsStore, currentEpoch: Epoch) = var toPrune: seq[ValidatorIndex] for idx, entry in store.mappings: if (currentEpoch - entry.addedAt) > 2: toPrune.add idx for idx in toPrune: store.mappings.del idx