nimbus-eth2/beacon_chain/spec/eth2_apis/dynamic_fee_recipients.nim

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import
std/tables,
stew/results,
chronicles,
../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]())
proc addMapping*(store: var DynamicFeeRecipientsStore,
validator: ValidatorIndex,
feeRecipient: Eth1Address,
currentEpoch: Epoch) =
var
found, updated = false
store.mappings.withValue(validator, entry) do:
updated = not (entry[].recipient == feeRecipient)
entry[] = Entry(recipient: feeRecipient, addedAt: currentEpoch)
do:
updated = true
store.mappings[validator] = Entry(recipient: feeRecipient,
addedAt: currentEpoch)
if updated:
info "Updating fee recipient",
validator, feeRecipient = feeRecipient.toHex(), currentEpoch
else:
debug "Refreshing fee recipient",
validator, feeRecipient = feeRecipient.toHex(), 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