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disable aggregation when no validators are connected (#908) 

* if we don't have validators, don't consider aggregation work
* if we do have validators, don't aggregate when we're out of sync
* when we do aggregate, use a fresh state, and not one from before
sleeping
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Jacek Sieka 2020-04-20 14:20:53 +02:00 committed by GitHub
parent 722c4767fa
commit edecce1751
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1 changed files with 31 additions and 32 deletions
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31
beacon_chain/beacon_node.nim
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@ -21,7 +21,7 @@ import
const
genesisFile = "genesis.ssz"
hasPrompt = not defined(withoutPrompt)
maxEmptySlotCount = uint64(24*60*60) div SECONDS_PER_SLOT
maxEmptySlotCount = uint64(10*60) div SECONDS_PER_SLOT
type
KeyPair = eth2_network.KeyPair
@ -311,8 +311,7 @@ proc isSynced(node: BeaconNode, head: BlockRef): bool =
# TODO if everyone follows this logic, the network will not recover from a
# halt: nobody will be producing blocks because everone expects someone
# else to do it
if wallSlot.afterGenesis and (wallSlot.slot > head.slot) and
(wallSlot.slot - head.slot) > maxEmptySlotCount:
if wallSlot.afterGenesis and head.slot + maxEmptySlotCount < wallSlot.slot:
false
else:
true
@ -828,25 +827,24 @@ proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, asyn
# block from the expected block proposer for the assigned slot or
# (b) one-third of the slot has transpired (`SECONDS_PER_SLOT / 3` seconds
# after the start of slot) -- whichever comes first.
template sleepToSlotOffset(extra: chronos.Duration, msg: static string) =
let
attestationStart = node.beaconClock.fromNow(slot)
thirdSlot = seconds(int64(SECONDS_PER_SLOT)) div 3
fromNow = node.beaconClock.fromNow(slot.toBeaconTime(extra))
if attestationStart.inFuture or attestationStart.offset <= thirdSlot:
let fromNow =
if attestationStart.inFuture: attestationStart.offset + thirdSlot
else: thirdSlot - attestationStart.offset
trace "Waiting to send attestations",
if fromNow.inFuture:
trace msg,
slot = shortLog(slot),
fromNow = shortLog(fromNow),
fromNow = shortLog(fromNow.offset),
cat = "scheduling"
await sleepAsync(fromNow)
await sleepAsync(fromNow.offset)
# Time passed - we might need to select a new head in that case
head = node.updateHead()
sleepToSlotOffset(
seconds(int64(SECONDS_PER_SLOT)) div 3, "Waiting to send attestations")
handleAttestations(node, head, slot)
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/validator.md#broadcast-aggregate
@ -856,15 +854,16 @@ proc onSlotStart(node: BeaconNode, lastSlot, scheduledSlot: Slot) {.gcsafe, asyn
# through the slot-that is, SECONDS_PER_SLOT * 2 / 3 seconds after the start
# of slot.
if slot > 2:
sleepToSlotOffset(
seconds(int64(SECONDS_PER_SLOT * 2) div 3),
"Waiting to aggregate attestations")
const TRAILING_DISTANCE = 1
let aggregationSlot = slot - TRAILING_DISTANCE
var aggregationHead = getAncestorAt(head, aggregationSlot)
let bs = BlockSlot(blck: aggregationHead, slot: aggregationSlot)
node.blockPool.withState(node.blockPool.tmpState, bs):
let twoThirdsSlot =
toBeaconTime(slot, seconds(2*int64(SECONDS_PER_SLOT)) div 3)
addTimer(saturate(node.beaconClock.fromNow(twoThirdsSlot))) do (p: pointer):
broadcastAggregatedAttestations(
node, state, aggregationHead, aggregationSlot, TRAILING_DISTANCE)