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move attesting up from halfway to one third of the way through slots (#643)

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* per honest validator and naïve/simple aggregator attestation specs, move attesting up from halfway to one third of the way through slots

* Update beacon_chain/beacon_node.nim

Co-Authored-By: Jacek Sieka <jacek@status.im>
This commit is contained in:
tersec 2019-12-11 13:02:07 +00:00 committed by Mamy Ratsimbazafy
parent a96e48ee2e
commit cb1bc6cbf1
2 changed files with 10 additions and 6 deletions
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14
beacon_chain/beacon_node.nim
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@ -789,14 +789,20 @@ proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, asyn
# the work for the whole slot using a monotonic clock instead, then deal
# with any clock discrepancies once only, at the start of slot timer
# processing..
# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/validator/0_beacon-chain-validator.md#attesting
# A validator should create and broadcast the attestation to the
# associated attestation subnet one-third of the way through the slot
# during which the validator is assigned―that is, SECONDS_PER_SLOT / 3
# seconds after the start of slot.
let
attestationStart = node.beaconClock.fromNow(slot)
halfSlot = seconds(int64(SECONDS_PER_SLOT div 2))
thirdSlot = seconds(int64(SECONDS_PER_SLOT)) div 3
if attestationStart.inFuture or attestationStart.offset <= halfSlot:
if attestationStart.inFuture or attestationStart.offset <= thirdSlot:
let fromNow =
if attestationStart.inFuture: attestationStart.offset + halfSlot
else: halfSlot - attestationStart.offset
if attestationStart.inFuture: attestationStart.offset + thirdSlot
else: thirdSlot - attestationStart.offset
trace "Waiting to send attestations",
slot = shortLog(slot),

2
beacon_chain/time.nim
View File

@ -60,8 +60,6 @@ func toSlot*(c: BeaconClock, t: Time): tuple[afterGenesis: bool, slot: Slot] =
func toBeaconTime*(s: Slot, offset = chronos.seconds(0)): BeaconTime =
BeaconTime(int64(uint64(s) * SECONDS_PER_SLOT) + seconds(offset))
# TODO on Travis ARM64 CIs, this claims to have side effects, but neither Linux
# nor Mac OS x86 CIs exhibit this behavior.
proc now*(c: BeaconClock): BeaconTime =
## Current time, in slots - this may end up being less than GENESIS_SLOT(!)
toBeaconTime(c, getTime())