nimbus-eth2/beacon_chain/sync/request_manager.nim

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# beacon_chain
# Copyright (c) 2018-2021 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import options, sequtils, strutils
import chronos, chronicles
import
../spec/datatypes/[phase0, altair],
../spec/forks,
../networking/eth2_network,
"."/sync_protocol, "."/sync_manager
export sync_manager
logScope:
topics = "requman"
const
SYNC_MAX_REQUESTED_BLOCKS* = 32 # Spec allows up to MAX_REQUEST_BLOCKS.
## Maximum number of blocks which will be requested in each
## `beaconBlocksByRoot` invocation.
PARALLEL_REQUESTS* = 2
## Number of peers we using to resolve our request.
type
BlockVerifier* =
proc(signedBlock: ForkedSignedBeaconBlock):
Future[Result[void, BlockError]] {.gcsafe, raises: [Defect].}
RequestManager* = object
network*: Eth2Node
inpQueue*: AsyncQueue[FetchRecord]
blockVerifier: BlockVerifier
loopFuture: Future[void]
func shortLog*(x: seq[Eth2Digest]): string =
"[" & x.mapIt(shortLog(it)).join(", ") & "]"
func shortLog*(x: seq[FetchRecord]): string =
"[" & x.mapIt(shortLog(it.root)).join(", ") & "]"
proc init*(T: type RequestManager, network: Eth2Node,
blockVerifier: BlockVerifier): RequestManager =
RequestManager(
network: network,
inpQueue: newAsyncQueue[FetchRecord](),
blockVerifier: blockVerifier
)
proc checkResponse(roots: openArray[Eth2Digest],
blocks: openArray[ForkedSignedBeaconBlock]): bool =
## This procedure checks peer's response.
var checks = @roots
if len(blocks) > len(roots):
return false
for blk in blocks:
let res = checks.find(blk.root)
if res == -1:
return false
else:
checks.del(res)
return true
proc fetchAncestorBlocksFromNetwork(rman: RequestManager,
items: seq[Eth2Digest]) {.async.} =
var peer: Peer
try:
peer = await rman.network.peerPool.acquire()
debug "Requesting blocks by root", peer = peer, blocks = shortLog(items),
peer_score = peer.getScore()
let blocks = if peer.useSyncV2():
await peer.beaconBlocksByRoot_v2(BlockRootsList items)
else:
(await peer.beaconBlocksByRoot(BlockRootsList items)).map() do (blcks: seq[phase0.SignedBeaconBlock]) -> auto:
blcks.mapIt(ForkedSignedBeaconBlock.init(it))
if blocks.isOk:
let ublocks = blocks.get()
if checkResponse(items, ublocks):
var res: Result[void, BlockError]
if len(ublocks) > 0:
for b in ublocks:
res = await rman.blockVerifier(b)
if res.isErr():
case res.error()
of BlockError.MissingParent:
# Ignoring because the order of the blocks that
# we requested may be different from the order in which we need
# these blocks to apply.
discard
of BlockError.Duplicate, BlockError.UnviableFork:
# Ignoring because these errors could occur due to the
# concurrent/parallel requests we made.
discard
of BlockError.Invalid:
# We stop processing blocks further to avoid DoS attack with big
# chunk of incorrect blocks.
break
else:
res = Result[void, BlockError].ok()
if res.isOk():
if len(ublocks) > 0:
# We reward peer only if it returns something.
peer.updateScore(PeerScoreGoodBlocks)
else:
# We are not penalizing other errors because of the reasons described
# above.
if res.error == BlockError.Invalid:
peer.updateScore(PeerScoreBadBlocks)
else:
peer.updateScore(PeerScoreBadResponse)
else:
peer.updateScore(PeerScoreNoBlocks)
except CancelledError as exc:
raise exc
except CatchableError as exc:
peer.updateScore(PeerScoreNoBlocks)
debug "Error while fetching ancestor blocks", exc = exc.msg,
items = shortLog(items), peer = peer, peer_score = peer.getScore()
raise exc
finally:
if not(isNil(peer)):
rman.network.peerPool.release(peer)
proc requestManagerLoop(rman: RequestManager) {.async.} =
var rootList = newSeq[Eth2Digest]()
var workers = newSeq[Future[void]](PARALLEL_REQUESTS)
while true:
try:
rootList.setLen(0)
let req = await rman.inpQueue.popFirst()
rootList.add(req.root)
var count = min(SYNC_MAX_REQUESTED_BLOCKS - 1, len(rman.inpQueue))
while count > 0:
rootList.add(rman.inpQueue.popFirstNoWait().root)
dec(count)
let start = SyncMoment.now(0)
for i in 0 ..< PARALLEL_REQUESTS:
workers[i] = rman.fetchAncestorBlocksFromNetwork(rootList)
# We do not care about
await allFutures(workers)
let finish = SyncMoment.now(uint64(len(rootList)))
var succeed = 0
for worker in workers:
if worker.finished() and not(worker.failed()):
inc(succeed)
debug "Request manager tick", blocks_count = len(rootList),
succeed = succeed,
failed = (len(workers) - succeed),
queue_size = len(rman.inpQueue),
sync_speed = speed(start, finish)
except CatchableError as exc:
debug "Got a problem in request manager", exc = exc.msg
proc start*(rman: var RequestManager) =
## Start Request Manager's loop.
rman.loopFuture = rman.requestManagerLoop()
proc stop*(rman: RequestManager) =
## Stop Request Manager's loop.
if not(isNil(rman.loopFuture)):
rman.loopFuture.cancel()
2020-02-26 13:31:24 +00:00
proc fetchAncestorBlocks*(rman: RequestManager, roots: seq[FetchRecord]) =
## Enqueue list missing blocks roots ``roots`` for download by
## Request Manager ``rman``.
for item in roots:
try:
rman.inpQueue.addLastNoWait(item)
except AsyncQueueFullError: raiseAssert "unbounded queue"