665 lines
24 KiB
Nim
665 lines
24 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import std/[options, heapqueue, tables, strutils, sequtils, algorithm]
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import stew/[results, base10], chronos, chronicles
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import
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../spec/datatypes/[phase0, altair],
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../spec/eth2_apis/rpc_types,
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../spec/[helpers, forks],
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../networking/[peer_pool, peer_scores, eth2_network],
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../beacon_clock,
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"."/[sync_protocol, sync_queue]
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export phase0, altair, merge, chronos, chronicles, results,
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helpers, peer_scores, sync_queue, forks, sync_protocol
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logScope:
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topics = "syncman"
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const
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SyncWorkersCount* = 10
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## Number of sync workers to spawn
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StatusUpdateInterval* = chronos.minutes(1)
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## Minimum time between two subsequent calls to update peer's status
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StatusExpirationTime* = chronos.minutes(2)
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## Time time it takes for the peer's status information to expire.
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type
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SyncWorkerStatus* {.pure.} = enum
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Sleeping, WaitingPeer, UpdatingStatus, Requesting, Downloading, Queueing,
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Processing
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SyncWorker*[A, B] = object
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future: Future[void]
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status: SyncWorkerStatus
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SyncManager*[A, B] = ref object
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pool: PeerPool[A, B]
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responseTimeout: chronos.Duration
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maxHeadAge: uint64
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toleranceValue: uint64
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getLocalHeadSlot: GetSlotCallback
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getLocalWallSlot: GetSlotCallback
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getSafeSlot: GetSlotCallback
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getFirstSlot: GetSlotCallback
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getLastSlot: GetSlotCallback
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progressPivot: Slot
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workers: array[SyncWorkersCount, SyncWorker[A, B]]
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notInSyncEvent: AsyncEvent
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rangeAge: uint64
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chunkSize: uint64
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queue: SyncQueue[A]
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syncFut: Future[void]
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blockVerifier: BlockVerifier
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inProgress*: bool
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insSyncSpeed*: float
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avgSyncSpeed*: float
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syncStatus*: string
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direction: SyncQueueKind
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ident*: string
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SyncMoment* = object
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stamp*: chronos.Moment
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slots*: uint64
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SyncManagerError* = object of CatchableError
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BeaconBlocksRes* = NetRes[seq[ref ForkedSignedBeaconBlock]]
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proc now*(sm: typedesc[SyncMoment], slots: uint64): SyncMoment {.inline.} =
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SyncMoment(stamp: now(chronos.Moment), slots: slots)
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proc speed*(start, finish: SyncMoment): float {.inline.} =
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## Returns number of slots per second.
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if finish.slots <= start.slots or finish.stamp <= start.stamp:
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0.0 # replays for example
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else:
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let
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slots = float(finish.slots - start.slots)
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dur = toFloatSeconds(finish.stamp - start.stamp)
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slots / dur
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proc initQueue[A, B](man: SyncManager[A, B]) =
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case man.direction
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of SyncQueueKind.Forward:
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man.queue = SyncQueue.init(A, man.direction, man.getFirstSlot(),
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man.getLastSlot(), man.chunkSize,
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man.getSafeSlot, man.blockVerifier, 1)
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of SyncQueueKind.Backward:
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let
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firstSlot = man.getFirstSlot()
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lastSlot = man.getLastSlot()
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startSlot = if firstSlot == lastSlot:
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# This case should never be happened in real life because
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# there is present check `needsBackfill().
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firstSlot
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else:
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Slot(firstSlot - 1'u64)
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man.queue = SyncQueue.init(A, man.direction, startSlot, lastSlot,
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man.chunkSize, man.getSafeSlot,
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man.blockVerifier, 1)
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proc newSyncManager*[A, B](pool: PeerPool[A, B],
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direction: SyncQueueKind,
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getLocalHeadSlotCb: GetSlotCallback,
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getLocalWallSlotCb: GetSlotCallback,
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getFinalizedSlotCb: GetSlotCallback,
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getBackfillSlotCb: GetSlotCallback,
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progressPivot: Slot,
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blockVerifier: BlockVerifier,
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maxHeadAge = uint64(SLOTS_PER_EPOCH * 1),
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chunkSize = uint64(SLOTS_PER_EPOCH),
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toleranceValue = uint64(1),
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ident = "main"
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): SyncManager[A, B] =
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let (getFirstSlot, getLastSlot, getSafeSlot) = case direction
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of SyncQueueKind.Forward:
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(getLocalHeadSlotCb, getLocalWallSlotCb, getFinalizedSlotCb)
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of SyncQueueKind.Backward:
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(getBackfillSlotCb, GetSlotCallback(proc(): Slot = Slot(0)),
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getBackfillSlotCb)
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var res = SyncManager[A, B](
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pool: pool,
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getLocalHeadSlot: getLocalHeadSlotCb,
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getLocalWallSlot: getLocalWallSlotCb,
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getSafeSlot: getSafeSlot,
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getFirstSlot: getFirstSlot,
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getLastSlot: getLastSlot,
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progressPivot: progressPivot,
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maxHeadAge: maxHeadAge,
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chunkSize: chunkSize,
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blockVerifier: blockVerifier,
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notInSyncEvent: newAsyncEvent(),
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direction: direction,
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ident: ident
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)
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res.initQueue()
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res
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proc getBlocks*[A, B](man: SyncManager[A, B], peer: A,
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req: SyncRequest): Future[BeaconBlocksRes] {.async.} =
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mixin beaconBlocksByRange, getScore, `==`
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logScope:
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peer_score = peer.getScore()
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peer_speed = peer.netKbps()
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sync_ident = man.ident
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direction = man.direction
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topics = "syncman"
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doAssert(not(req.isEmpty()), "Request must not be empty!")
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debug "Requesting blocks from peer", request = req
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try:
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let res =
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if peer.useSyncV2():
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await beaconBlocksByRange_v2(peer, req.slot, req.count, req.step)
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else:
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(await beaconBlocksByRange(peer, req.slot, req.count, req.step)).map(
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proc(blcks: seq[phase0.SignedBeaconBlock]): auto =
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blcks.mapIt(newClone(ForkedSignedBeaconBlock.init(it))))
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if res.isErr():
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debug "Error, while reading getBlocks response", request = req,
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error = $res.error()
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return
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return res
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except CancelledError:
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debug "Interrupt, while waiting getBlocks response", request = req
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return
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except CatchableError as exc:
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debug "Error, while waiting getBlocks response", request = req,
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errName = exc.name, errMsg = exc.msg
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return
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proc remainingSlots(man: SyncManager): uint64 =
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if man.direction == SyncQueueKind.Forward:
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man.getLastSlot() - man.getFirstSlot()
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else:
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man.getFirstSlot() - man.getLastSlot()
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proc syncStep[A, B](man: SyncManager[A, B], index: int, peer: A) {.async.} =
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logScope:
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peer_score = peer.getScore()
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peer_speed = peer.netKbps()
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index = index
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sync_ident = man.ident
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topics = "syncman"
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var
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headSlot = man.getLocalHeadSlot()
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wallSlot = man.getLocalWallSlot()
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peerSlot = peer.getHeadSlot()
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block: # Check that peer status is recent and relevant
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logScope:
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peer = peer
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direction = man.direction
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debug "Peer's syncing status", wall_clock_slot = wallSlot,
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remote_head_slot = peerSlot, local_head_slot = headSlot
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let
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peerStatusAge = Moment.now() - peer.state(BeaconSync).statusLastTime
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needsUpdate =
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# Latest status we got is old
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peerStatusAge >= StatusExpirationTime or
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# The point we need to sync is close to where the peer is
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man.getFirstSlot() >= peerSlot
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if needsUpdate:
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man.workers[index].status = SyncWorkerStatus.UpdatingStatus
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# Avoid a stampede of requests, but make them more frequent in case the
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# peer is "close" to the slot range of interest
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if peerStatusAge < StatusExpirationTime div 2:
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await sleepAsync(StatusExpirationTime div 2 - peerStatusAge)
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trace "Updating peer's status information", wall_clock_slot = wallSlot,
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remote_head_slot = peerSlot, local_head_slot = headSlot
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try:
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let res = await peer.updateStatus()
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if not(res):
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peer.updateScore(PeerScoreNoStatus)
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debug "Failed to get remote peer's status, exiting",
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peer_head_slot = peerSlot
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return
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except CatchableError as exc:
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debug "Unexpected exception while updating peer's status",
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peer_head_slot = peerSlot, errName = exc.name, errMsg = exc.msg
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return
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let newPeerSlot = peer.getHeadSlot()
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if peerSlot >= newPeerSlot:
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peer.updateScore(PeerScoreStaleStatus)
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debug "Peer's status information is stale",
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wall_clock_slot = wallSlot, remote_old_head_slot = peerSlot,
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local_head_slot = headSlot, remote_new_head_slot = newPeerSlot
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else:
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debug "Peer's status information updated", wall_clock_slot = wallSlot,
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remote_old_head_slot = peerSlot, local_head_slot = headSlot,
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remote_new_head_slot = newPeerSlot
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peer.updateScore(PeerScoreGoodStatus)
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peerSlot = newPeerSlot
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# Time passed - enough to move slots, if sleep happened
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headSlot = man.getLocalHeadSlot()
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wallSlot = man.getLocalWallSlot()
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if peerSlot > wallSlot + man.toleranceValue:
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# If the peer reports a head slot higher than our wall slot, something is
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# wrong: our clock is off or the peer is on a different network (or
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# dishonest)
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peer.updateScore(PeerScoreHeadTooNew)
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warn "Peer reports a head newer than our wall clock - clock out of sync?",
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wall_clock_slot = wallSlot, remote_head_slot = peerSlot,
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local_head_slot = headSlot, tolerance_value = man.toleranceValue
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return
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if man.remainingSlots() <= man.maxHeadAge:
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logScope:
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peer = peer
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direction = man.direction
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case man.direction
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of SyncQueueKind.Forward:
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info "We are in sync with network", wall_clock_slot = wallSlot,
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remote_head_slot = peerSlot, local_head_slot = headSlot
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of SyncQueueKind.Backward:
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info "Backfill complete", wall_clock_slot = wallSlot,
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remote_head_slot = peerSlot, local_head_slot = headSlot
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# We clear SyncManager's `notInSyncEvent` so all the workers will become
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# sleeping soon.
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man.notInSyncEvent.clear()
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return
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# Find out if the peer potentially can give useful blocks - in the case of
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# forward sync, they can be useful if they have blocks newer than our head -
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# in the case of backwards sync, they're useful if they have blocks newer than
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# the backfill point
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if man.getFirstSlot() >= peerSlot:
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# This is not very good solution because we should not discriminate and/or
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# penalize peers which are in sync process too, but their latest head is
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# lower then our latest head. We should keep connections with such peers
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# (so this peers are able to get in sync using our data), but we should
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# not use this peers for syncing because this peers are useless for us.
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# Right now we decreasing peer's score a bit, so it will not be
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# disconnected due to low peer's score, but new fresh peers could replace
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# peers with low latest head.
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debug "Peer's head slot is lower then local head slot", peer = peer,
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wall_clock_slot = wallSlot, remote_head_slot = peerSlot,
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local_last_slot = man.getLastSlot(),
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local_first_slot = man.getFirstSlot(),
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direction = man.direction
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peer.updateScore(PeerScoreUseless)
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return
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if man.direction == SyncQueueKind.Forward:
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# Wall clock keeps ticking, so we need to update the queue
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man.queue.updateLastSlot(man.getLastSlot())
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man.workers[index].status = SyncWorkerStatus.Requesting
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let req = man.queue.pop(peerSlot, peer)
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if req.isEmpty():
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# SyncQueue could return empty request in 2 cases:
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# 1. There no more slots in SyncQueue to download (we are synced, but
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# our ``notInSyncEvent`` is not yet cleared).
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# 2. Current peer's known head slot is too low to satisfy request.
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#
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# To avoid endless loop we going to wait for RESP_TIMEOUT time here.
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# This time is enough for all pending requests to finish and it is also
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# enough for main sync loop to clear ``notInSyncEvent``.
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debug "Empty request received from queue, exiting", peer = peer,
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local_head_slot = headSlot, remote_head_slot = peerSlot,
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queue_input_slot = man.queue.inpSlot,
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queue_output_slot = man.queue.outSlot,
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queue_last_slot = man.queue.finalSlot, direction = man.direction
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await sleepAsync(RESP_TIMEOUT)
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return
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debug "Creating new request for peer", wall_clock_slot = wallSlot,
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remote_head_slot = peerSlot, local_head_slot = headSlot,
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request = req
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man.workers[index].status = SyncWorkerStatus.Downloading
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try:
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let blocks = await man.getBlocks(peer, req)
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if blocks.isOk():
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let data = blocks.get()
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let smap = getShortMap(req, data)
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debug "Received blocks on request", blocks_count = len(data),
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blocks_map = smap, request = req
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if not(checkResponse(req, data)):
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peer.updateScore(PeerScoreBadResponse)
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warn "Received blocks sequence is not in requested range",
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blocks_count = len(data), blocks_map = smap,
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request = req
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return
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# Scoring will happen in `syncUpdate`.
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man.workers[index].status = SyncWorkerStatus.Queueing
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await man.queue.push(req, data, proc() =
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man.workers[index].status = SyncWorkerStatus.Processing)
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else:
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peer.updateScore(PeerScoreNoBlocks)
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man.queue.push(req)
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debug "Failed to receive blocks on request", request = req
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return
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except CatchableError as exc:
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debug "Unexpected exception while receiving blocks", request = req,
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errName = exc.name, errMsg = exc.msg
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return
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proc syncWorker[A, B](man: SyncManager[A, B], index: int) {.async.} =
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mixin getKey, getScore, getHeadSlot
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logScope:
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index = index
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sync_ident = man.ident
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direction = man.direction
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topics = "syncman"
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debug "Starting syncing worker"
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while true:
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var peer: A = nil
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let doBreak =
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try:
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man.workers[index].status = SyncWorkerStatus.Sleeping
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# This event is going to be set until we are not in sync with network
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await man.notInSyncEvent.wait()
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man.workers[index].status = SyncWorkerStatus.WaitingPeer
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peer = await man.pool.acquire()
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await man.syncStep(index, peer)
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man.pool.release(peer)
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false
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except CancelledError:
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if not(isNil(peer)):
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man.pool.release(peer)
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true
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except CatchableError as exc:
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debug "Unexpected exception in sync worker",
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peer = peer, peer_score = peer.getScore(),
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peer_speed = peer.netKbps(),
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errName = exc.name, errMsg = exc.msg
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true
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if doBreak:
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break
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debug "Sync worker stopped"
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proc getWorkersStats[A, B](man: SyncManager[A, B]): tuple[map: string,
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sleeping: int,
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waiting: int,
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pending: int] =
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var map = newString(len(man.workers))
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var sleeping, waiting, pending: int
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for i in 0 ..< len(man.workers):
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var ch: char
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case man.workers[i].status
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of SyncWorkerStatus.Sleeping:
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ch = 's'
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inc(sleeping)
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of SyncWorkerStatus.WaitingPeer:
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ch = 'w'
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inc(waiting)
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of SyncWorkerStatus.UpdatingStatus:
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ch = 'U'
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inc(pending)
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of SyncWorkerStatus.Requesting:
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ch = 'R'
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inc(pending)
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of SyncWorkerStatus.Downloading:
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ch = 'D'
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inc(pending)
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of SyncWorkerStatus.Queueing:
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ch = 'Q'
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inc(pending)
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of SyncWorkerStatus.Processing:
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ch = 'P'
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inc(pending)
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map[i] = ch
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(map, sleeping, waiting, pending)
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proc guardTask[A, B](man: SyncManager[A, B]) {.async.} =
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logScope:
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index = index
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sync_ident = man.ident
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direction = man.direction
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topics = "syncman"
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var pending: array[SyncWorkersCount, Future[void]]
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# Starting all the synchronization workers.
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for i in 0 ..< len(man.workers):
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let future = syncWorker[A, B](man, i)
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man.workers[i].future = future
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pending[i] = future
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# Wait for synchronization worker's failure and replace it with new one.
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while true:
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let failFuture = await one(pending)
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let index = pending.find(failFuture)
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if failFuture.failed():
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warn "Synchronization worker stopped working unexpectedly with an error",
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errName = failFuture.error.name, errMsg = failFuture.error.msg
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else:
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warn "Synchronization worker stopped working unexpectedly without error"
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let future = syncWorker[A, B](man, index)
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man.workers[index].future = future
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pending[index] = future
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proc toTimeLeftString*(d: Duration): string =
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if d == InfiniteDuration:
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"--h--m"
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else:
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var v = d
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var res = ""
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let ndays = chronos.days(v)
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if ndays > 0:
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res = res & (if ndays < 10: "0" & $ndays else: $ndays) & "d"
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v = v - chronos.days(ndays)
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let nhours = chronos.hours(v)
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if nhours > 0:
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res = res & (if nhours < 10: "0" & $nhours else: $nhours) & "h"
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v = v - chronos.hours(nhours)
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else:
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res = res & "00h"
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let nmins = chronos.minutes(v)
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if nmins > 0:
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res = res & (if nmins < 10: "0" & $nmins else: $nmins) & "m"
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v = v - chronos.minutes(nmins)
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else:
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res = res & "00m"
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res
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proc syncLoop[A, B](man: SyncManager[A, B]) {.async.} =
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logScope:
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sync_ident = man.ident
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direction = man.direction
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topics = "syncman"
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mixin getKey, getScore
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var pauseTime = 0
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var guardTaskFut = man.guardTask()
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debug "Synchronization loop started"
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proc averageSpeedTask() {.async.} =
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while true:
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# Reset sync speeds between each loss-of-sync event
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man.avgSyncSpeed = 0
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man.insSyncSpeed = 0
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await man.notInSyncEvent.wait()
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# Give the node time to connect to peers and get the sync process started
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await sleepAsync(seconds(SECONDS_PER_SLOT.int64))
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var
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stamp = SyncMoment.now(man.queue.progress())
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syncCount = 0
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while man.inProgress:
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await sleepAsync(seconds(SECONDS_PER_SLOT.int64))
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let
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newStamp = SyncMoment.now(man.queue.progress())
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slotsPerSec = speed(stamp, newStamp)
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syncCount += 1
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man.insSyncSpeed = slotsPerSec
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man.avgSyncSpeed =
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man.avgSyncSpeed + (slotsPerSec - man.avgSyncSpeed) / float(syncCount)
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stamp = newStamp
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var averageSpeedTaskFut = averageSpeedTask()
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while true:
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let wallSlot = man.getLocalWallSlot()
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let headSlot = man.getLocalHeadSlot()
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let (map, sleeping, waiting, pending) = man.getWorkersStats()
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debug "Current syncing state", workers_map = map,
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sleeping_workers_count = sleeping,
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waiting_workers_count = waiting,
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pending_workers_count = pending,
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wall_head_slot = wallSlot, local_head_slot = headSlot,
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pause_time = $chronos.seconds(pauseTime),
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avg_sync_speed = man.avgSyncSpeed, ins_sync_speed = man.insSyncSpeed
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let
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pivot = man.progressPivot
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progress = float(
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if man.queue.kind == SyncQueueKind.Forward: man.queue.outSlot - pivot
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else: pivot - man.queue.outSlot)
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total = float(
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if man.queue.kind == SyncQueueKind.Forward: man.queue.finalSlot - pivot
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else: pivot - man.queue.finalSlot)
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remaining = total - progress
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done = if total > 0.0: progress / total else: 1.0
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timeleft =
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if man.avgSyncSpeed >= 0.001:
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Duration.fromFloatSeconds(remaining / man.avgSyncSpeed)
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else: InfiniteDuration
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currentSlot = Base10.toString(
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if man.queue.kind == SyncQueueKind.Forward:
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max(uint64(man.queue.outSlot), 1'u64) - 1'u64
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else:
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uint64(man.queue.outSlot) + 1'u64
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)
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# Update status string
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man.syncStatus = timeLeft.toTimeLeftString() & " (" &
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(done * 100).formatBiggestFloat(ffDecimal, 2) & "%) " &
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man.avgSyncSpeed.formatBiggestFloat(ffDecimal, 4) &
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"slots/s (" & map & ":" & currentSlot & ")"
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if man.remainingSlots() <= man.maxHeadAge:
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man.notInSyncEvent.clear()
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# We are marking SyncManager as not working only when we are in sync and
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# all sync workers are in `Sleeping` state.
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if pending > 0:
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debug "Synchronization loop waits for workers completion",
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wall_head_slot = wallSlot, local_head_slot = headSlot,
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difference = (wallSlot - headSlot), max_head_age = man.maxHeadAge,
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sleeping_workers_count = sleeping,
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waiting_workers_count = waiting, pending_workers_count = pending
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# We already synced, so we should reset all the pending workers from
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# any state they have.
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man.queue.clearAndWakeup()
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man.inProgress = true
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else:
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case man.direction
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of SyncQueueKind.Forward:
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if man.inProgress:
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man.inProgress = false
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debug "Forward synchronization process finished, sleeping",
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wall_head_slot = wallSlot, local_head_slot = headSlot,
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difference = (wallSlot - headSlot),
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max_head_age = man.maxHeadAge
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else:
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debug "Synchronization loop sleeping", wall_head_slot = wallSlot,
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local_head_slot = headSlot,
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difference = (wallSlot - headSlot),
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max_head_age = man.maxHeadAge
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of SyncQueueKind.Backward:
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# Backward syncing is going to be executed only once, so we exit loop
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# and stop all pending tasks which belongs to this instance (sync
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# workers, guard task and speed calculation task).
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# We first need to cancel and wait for guard task, because otherwise
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# it will be able to restore cancelled workers.
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guardTaskFut.cancel()
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averageSpeedTaskFut.cancel()
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await allFutures(guardTaskFut, averageSpeedTaskFut)
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let pendingTasks =
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block:
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var res: seq[Future[void]]
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for worker in man.workers:
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# Because `pending == 0` there should be no active workers.
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doAssert(worker.status in {Sleeping, WaitingPeer})
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worker.future.cancel()
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res.add(worker.future)
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res
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await allFutures(pendingTasks)
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man.inProgress = false
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debug "Backward synchronization process finished, exiting",
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wall_head_slot = wallSlot, local_head_slot = headSlot,
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backfill_slot = man.getLastSlot(),
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max_head_age = man.maxHeadAge
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break
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else:
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if not(man.notInSyncEvent.isSet()):
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# We get here only if we lost sync for more then `maxHeadAge` period.
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if pending == 0:
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man.initQueue()
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man.notInSyncEvent.fire()
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man.inProgress = true
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debug "Node lost sync for more then preset period",
|
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period = man.maxHeadAge, wall_head_slot = wallSlot,
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local_head_slot = headSlot,
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missing_slots = man.remainingSlots(),
|
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progress = float(man.queue.progress())
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|
else:
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man.notInSyncEvent.fire()
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|
man.inProgress = true
|
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|
|
await sleepAsync(chronos.seconds(2))
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|
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proc start*[A, B](man: SyncManager[A, B]) =
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## Starts SyncManager's main loop.
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man.syncFut = man.syncLoop()
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proc getInfo*[A, B](man: SyncManager[A, B]): RpcSyncInfo =
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## Returns current synchronization information for RPC call.
|
|
let wallSlot = man.getLocalWallSlot()
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|
let headSlot = man.getLocalHeadSlot()
|
|
let sync_distance = wallSlot - headSlot
|
|
(
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head_slot: headSlot,
|
|
sync_distance: sync_distance,
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|
is_syncing: man.inProgress
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|
)
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