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# Nimbus - Rapidly converge on and track the canonical chain head of each peer
#
# Copyright (c) 2021 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed
# except according to those terms.
## Note: This module is currently unused (not used anymore)
## This module fetches and tracks the canonical chain head of each connected
## peer. (Or in future, each peer we care about; we won't poll them all so
## often.)
##
## This is for when we aren't sure of the block number of a peer's canonical
## chain head. Most of the time, after finding which block, it quietly polls
## to track small updates to the "best" block number and hash of each peer.
##
## But sometimes that can get out of step. If there has been a deeper reorg
## than our tracking window, or a burst of more than a few new blocks, network
## delays, downtime, or the peer is itself syncing. Perhaps we stopped Nimbus
## and restarted a while later, e.g. suspending a laptop or Control-Z. Then
## this will catch up. It is even possible that the best hash the peer gave us
## in the `Status` handshake has disappeared by the time we query for the
## corresponding block number, so we start at zero.
##
## The steps here perform a robust and efficient O(log N) search to rapidly
## converge on the new best block if it's moved out of the polling window no
## matter where it starts, confirm the peer's canonical chain head boundary,
## then track the peer's chain head in real-time by polling. The method is
## robust to peer state changes at any time.
##
## The purpose is to:
##
## - Help with finding a peer common chain prefix ("fast sync pivot") in a
## consistent, fast and explicit way.
##
## - Catch up quickly after any long pauses of network downtime, program not
## running, or deep chain reorgs.
##
## - Be able to display real-time peer states, so they are less mysterious.
##
## - Tell the beam/snap/trie sync processes when to start and what blocks to
## fetch, and keep those fetchers in the head-adjacent window of the
## ever-changing chain.
##
## - Help the sync process bootstrap usefully when we only have one peer,
## speculatively fetching and validating what data we can before we have more
## peers to corroborate the consensus.
##
## - Help detect consensus failures in the network.
##
## We cannot assume a peer's canonical chain stays the same or only gains new
## blocks from one query to the next. There can be reorgs, including deep
## reorgs. When a reorg happens, the best block number can decrease if the new
## canonical chain is shorter than the old one, and the best block hash we
## previously knew can become unavailable on the peer. So we must detect when
## the current best block disappears and be able to reduce block number.
import
std/[bitops, sequtils, strutils],
chronicles,
chronos,
eth/[common, p2p, p2p/private/p2p_types],
"../.."/[constants, genesis, p2p/chain/chain_desc],
".."/[protocol, sync_desc, types],
../snap/worker_desc
{.push raises: [Defect].}
logScope:
topics = "snap-pivot"
const
syncLockedMinimumReply = 8
## Minimum number of headers we assume any peers will send if they have
## them in contiguous ascending queries. Fewer than this confirms we have
## found the peer's canonical chain head boundary. Must be at least 2, and
## at least `syncLockedQueryOverlap+2` to stay `SyncLocked` when the chain
## extends. Should not be large as that would be stretching assumptions
## about peer implementations. 8 is chosen as it allows 3-deep extensions
## and 3-deep reorgs to be followed in a single round trip.
syncLockedQueryOverlap = 4
## Number of headers to re-query on each poll when `SyncLocked` so that we
## get small reorg updates in one round trip. Must be no more than
## `syncLockedMinimumReply-1`, no more than `syncLockedMinimumReply-2` to
## stay `SyncLocked` when the chain extends, and not too large to avoid
## excessive duplicate fetching. 4 is chosen as it allows 3-deep reorgs
## to be followed in single round trip.
syncLockedQuerySize = 192
## Query size when polling `SyncLocked`. Must be at least
## `syncLockedMinimumReply`. Large is fine, if we get a large reply the
## values are almost always useful.
huntQuerySize = 16
## Query size when hunting for canonical head boundary. Small is good
## because we don't want to keep most of the headers at hunt time.
huntForwardExpandShift = 4
## Expansion factor during `HuntForward` exponential search.
## 16 is chosen for rapid convergence when bootstrapping or catching up.
huntBackwardExpandShift = 1
## Expansion factor during `HuntBackward` exponential search.
## 2 is chosen for better convergence when tracking a chain reorg.
type
WorkerMode = enum
## The current state of tracking the peer's canonical chain head.
## `bestBlockNumber` is only valid when this is `SyncLocked`.
SyncLocked
SyncOnlyHash
HuntForward
HuntBackward
HuntRange
HuntRangeFinal
SnapWorkerStats* = tuple
## Statistics counters for events associated with this peer.
## These may be used to recognise errors and select good peers.
ok: tuple[
reorgDetected: uint,
getBlockHeaders: uint,
getNodeData: uint]
minor: tuple[
timeoutBlockHeaders: uint,
unexpectedBlockHash: uint]
major: tuple[
networkErrors: uint,
excessBlockHeaders: uint,
wrongBlockHeader: uint]
SnapPivotCtxRef* = ref object of RootRef
stats*: SnapWorkerStats ## Statistics counters
ctx: SnapCtxRef ## For debugging
chain: Chain ## Block chain database
SnapPivotWorkerRef* = ref object of RootRef
## Peer canonical chain head ("best block") search state.
header: Option[BlockHeader] ## Pivot header (if any)
syncMode: WorkerMode ## Action mode
lowNumber: BlockNumber ## Recent lowest known block number.
highNumber: BlockNumber ## Recent highest known block number.
bestNumber: BlockNumber
bestHash: BlockHash
step: uint
global: SnapPivotCtxRef
peer: Peer ## Current network peer
ctrl: BuddyCtrlRef ## Worker control start/stop
static:
doAssert syncLockedMinimumReply >= 2
doAssert syncLockedMinimumReply >= syncLockedQueryOverlap + 2
doAssert syncLockedQuerySize <= maxHeadersFetch
doAssert huntQuerySize >= 1 and huntQuerySize <= maxHeadersFetch
doAssert huntForwardExpandShift >= 1 and huntForwardExpandShift <= 8
doAssert huntBackwardExpandShift >= 1 and huntBackwardExpandShift <= 8
# Make sure that request/response wire protocol messages are id-tracked and
# would not overlap (no multi-protocol legacy support)
doAssert 66 <= protocol.ethVersion
# ------------------------------------------------------------------------------
# Private logging helpers
# ------------------------------------------------------------------------------
proc pp(a: MDigest[256]; collapse = true): string =
if not collapse:
a.data.mapIt(it.toHex(2)).join.toLowerAscii
elif a == EMPTY_ROOT_HASH:
"EMPTY_ROOT_HASH"
elif a == EMPTY_UNCLE_HASH:
"EMPTY_UNCLE_HASH"
elif a == EMPTY_SHA3:
"EMPTY_SHA3"
elif a == ZERO_HASH256:
"ZERO_HASH256"
else:
a.data.mapIt(it.toHex(2)).join[56 .. 63].toLowerAscii
proc pp(bh: BlockHash): string =
"%" & $bh.Hash256.pp
proc pp(bn: BlockNumber): string =
"#" & $bn
proc pp(bhn: HashOrNum): string =
if bhn.isHash: bhn.hash.pp else: bhn.number.pp
proc traceSyncLocked(
sp: SnapPivotWorkerRef;
num: BlockNumber;
hash: BlockHash;
) =
## Trace messages when peer canonical head is confirmed or updated.
let
peer = sp.peer
bestBlock = num.pp
if sp.syncMode != SyncLocked:
debug "Now tracking chain head of peer", peer,
bestBlock
elif num > sp.bestNumber:
if num == sp.bestNumber + 1:
debug "Peer chain head advanced one block", peer,
advance=1, bestBlock
else:
debug "Peer chain head advanced some blocks", peer,
advance=(sp.bestNumber - num), bestBlock
elif num < sp.bestNumber or hash != sp.bestHash:
debug "Peer chain head reorg detected", peer,
advance=(sp.bestNumber - num), bestBlock
# ------------------------------------------------------------------------------
# Private functions
# ------------------------------------------------------------------------------
proc clearSyncStateRoot(sp: SnapPivotWorkerRef) =
if sp.header.isSome:
debug "Stopping state sync from this peer", peer=sp.peer
sp.header = none(BlockHeader)
proc lockSyncStateAndFetch(sp: SnapPivotWorkerRef; header: BlockHeader) =
let
peer = sp.peer
stateRoot = header.stateRoot
hash = header.blockHash.BlockHash
thisBlock = header.blockNumber.pp
sp.traceSyncLocked(header.blockNumber, hash)
sp.bestNumber = header.blockNumber
sp.bestHash = hash
sp.syncMode = SyncLocked
if sp.header.isNone:
debug "Starting state sync from this peer", peer, thisBlock, stateRoot
elif sp.header.unsafeGet.stateRoot != stateRoot:
trace "Adjusting state sync root from this peer", peer, thisBlock, stateRoot
sp.header = some(header)
proc setHuntBackward(sp: SnapPivotWorkerRef, lowestAbsent: BlockNumber) =
## Start exponential search mode backward due to new uncertainty.
sp.syncMode = HuntBackward
sp.step = 0
# Block zero is always present.
sp.lowNumber = 0.toBlockNumber
# Zero `lowestAbsent` is never correct, but an incorrect peer could send it.
sp.highNumber =
if lowestAbsent > 0: lowestAbsent
else: 1.toBlockNumber
sp.clearSyncStateRoot()
proc setHuntForward(sp: SnapPivotWorkerRef, highestPresent: BlockNumber) =
## Start exponential search mode forward due to new uncertainty.
sp.syncMode = HuntForward
sp.step = 0
sp.lowNumber = highestPresent
sp.highNumber = high(BlockNumber)
sp.clearSyncStateRoot()
proc updateHuntAbsent(sp: SnapPivotWorkerRef, lowestAbsent: BlockNumber) =
## Converge uncertainty range backward.
if lowestAbsent < sp.highNumber:
sp.highNumber = lowestAbsent
# If uncertainty range has moved outside the search window, change to hunt
# backward to block zero. Note that empty uncertainty range is allowed
# (empty range is `hunt.lowNumber + 1 == hunt.highNumber`).
if sp.highNumber <= sp.lowNumber:
sp.setHuntBackward(lowestAbsent)
sp.clearSyncStateRoot()
proc updateHuntPresent(sp: SnapPivotWorkerRef, highestPresent: BlockNumber) =
## Converge uncertainty range forward.
if highestPresent > sp.lowNumber:
sp.lowNumber = highestPresent
# If uncertainty range has moved outside the search window, change to hunt
# forward to no upper limit. Note that empty uncertainty range is allowed
# (empty range is `hunt.lowNumber + 1 == hunt.highNumber`).
if sp.lowNumber >= sp.highNumber:
sp.setHuntForward(highestPresent)
sp.clearSyncStateRoot()
# ------------------------------------------------------------------------------
# Private functions, assemble request
# ------------------------------------------------------------------------------
proc peerSyncChainRequest(sp: SnapPivotWorkerRef): BlocksRequest =
## Choose `GetBlockHeaders` parameters when hunting or following the canonical
## chain of a peer.
if sp.syncMode == SyncLocked:
# Stable and locked. This is just checking for changes including reorgs.
# `sp.bestNumber` was recently the head of the peer's canonical
# chain. We must include this block number to detect when the canonical
# chain gets shorter versus no change.
result.startBlock.number =
if sp.bestNumber <= syncLockedQueryOverlap:
# Every peer should send genesis for block 0, so don't ask for it.
# `peerSyncChainEmptyReply` has logic to handle this reply as if it
# was for block 0. Aside from saving bytes, this is more robust if
# some client doesn't do genesis reply correctly.
1.toBlockNumber
else:
min(sp.bestNumber - syncLockedQueryOverlap.toBlockNumber,
high(BlockNumber) - (syncLockedQuerySize - 1).toBlockNumber)
result.maxResults = syncLockedQuerySize
return
if sp.syncMode == SyncOnlyHash:
# We only have the hash of the recent head of the peer's canonical chain.
# Like `SyncLocked`, query more than one item to detect when the
# canonical chain gets shorter, no change or longer.
result.startBlock = sp.bestHash.to(HashOrNum)
result.maxResults = syncLockedQuerySize
return
# Searching for the peers's canonical head. An ascending query is always
# used, regardless of search direction. This is because a descending query
# (`reverse = true` and `maxResults > 1`) is useless for searching: Either
# `startBlock` is present, in which case the extra descending results
# contribute no more information about the canonical head boundary, or
# `startBlock` is absent in which case there are zero results. It's not
# defined in the `eth` specification that there must be zero results (in
# principle peers could return the lower numbered blocks), but in practice
# peers stop at the first absent block in the sequence from `startBlock`.
#
# Guaranteeing O(log N) time convergence in all scenarios requires some
# properties to be true in both exponential search (expanding) and
# quasi-binary search (converging in a range). The most important is that
# the gap to `startBlock` after `hunt.lowNumber` and also before
# `hunt.highNumber` are proportional to the query step, where the query step
# is `hunt.step` exponentially expanding each round, or `maxStep`
# approximately evenly distributed in the range.
#
# `hunt.lowNumber+1` must not be used consistently as the start, even with a
# large enough query step size, as that will sometimes take O(N) to converge
# in both the exponential and quasi-binary searches. (Ending at
# `hunt.highNumber-1` is fine if `huntQuerySize > 1`. This asymmetry is
# due to ascending queries (see earlier comment), and non-empty truncated
# query reply being proof of presence before the truncation point, but not
# proof of absence after it. A reply can be truncated just because the peer
# decides to.)
#
# The proportional gap requirement is why we divide by query size here,
# instead of stretching to fit more strictly with `(range-1)/(size-1)`.
const huntFinalSize = max(2, huntQuerySize)
var maxStep = 0u
let fullRangeClamped =
if sp.highNumber <= sp.lowNumber: 0u
else: min(high(uint).toBlockNumber,
sp.highNumber - sp.lowNumber).truncate(uint) - 1
if fullRangeClamped >= huntFinalSize: # `HuntRangeFinal` condition.
maxStep = if huntQuerySize == 1:
fullRangeClamped
elif (huntQuerySize and (huntQuerySize-1)) == 0:
fullRangeClamped shr fastLog2(huntQuerySize)
else:
fullRangeClamped div huntQuerySize
doAssert huntFinalSize >= huntQuerySize
doAssert maxStep >= 1 # Ensured by the above assertion.
# Check for exponential search (expanding). Iterate `hunt.step`. O(log N)
# requires `startBlock` to be offset from `hunt.lowNumber`/`hunt.highNumber`.
if sp.syncMode in {HuntForward, HuntBackward} and
fullRangeClamped >= huntFinalSize:
let forward = sp.syncMode == HuntForward
let expandShift = if forward: huntForwardExpandShift
else: huntBackwardExpandShift
# Switches to range search when this condition is no longer true.
if sp.step < maxStep shr expandShift:
# The `if` above means the next line cannot overflow.
sp.step = if sp.step > 0: sp.step shl expandShift
else: 1
# Satisfy the O(log N) convergence conditions.
result.startBlock.number =
if forward: sp.lowNumber + sp.step.toBlockNumber
else: sp.highNumber -
(sp.step * huntQuerySize).toBlockNumber
result.maxResults = huntQuerySize
result.skip = sp.step - 1
return
# For tracing/display.
sp.step = maxStep
sp.syncMode = HuntRange
if maxStep > 0:
# Quasi-binary search (converging in a range). O(log N) requires
# `startBlock` to satisfy the constraints described above, with the
# proportionality from both ends of the range. The optimal information
# gathering position is tricky and doesn't make much difference, so don't
# bother. We'll centre the query in the range.
var offset = fullRangeClamped - maxStep * (huntQuerySize-1)
# Rounding must bias towards end to ensure `offset >= 1` after this.
offset -= offset shr 1
result.startBlock.number = sp.lowNumber + offset.toBlockNumber
result.maxResults = huntQuerySize
result.skip = maxStep - 1
else:
# Small range, final step. At `fullRange == 0` we must query at least one
# block before and after the range to confirm the canonical head boundary,
# or find it has moved. This ensures progress without getting stuck. When
# `fullRange` is small this is also beneficial, to get `SyncLocked` in one
# round trip from hereand it simplifies the other search branches below.
# Ideally the query is similar to `SyncLocked`, enough to get `SyncLocked`
# in one round trip, and accommodate a small reorg or extension.
const afterSoftMax = syncLockedMinimumReply - syncLockedQueryOverlap
const beforeHardMax = syncLockedQueryOverlap
let extra = huntFinalSize - fullRangeClamped
var before = (extra + 1) shr 1
before = max(before + afterSoftMax, extra) - afterSoftMax
before = min(before, beforeHardMax)
# See `SyncLocked` case.
result.startBlock.number =
if sp.bestNumber <= before.toBlockNumber: 1.toBlockNumber
else: min(sp.bestNumber - before.toBlockNumber,
high(BlockNumber) - (huntFinalSize - 1).toBlockNumber)
result.maxResults = huntFinalSize
sp.syncMode = HuntRangeFinal
# ------------------------------------------------------------------------------
# Private functions, reply handling
# ------------------------------------------------------------------------------
proc peerSyncChainEmptyReply(sp: SnapPivotWorkerRef; request: BlocksRequest) =
## Handle empty `GetBlockHeaders` reply. This means `request.startBlock` is
## absent on the peer. If it was `SyncLocked` there must have been a reorg
## and the previous canonical chain head has disappeared. If hunting, this
## updates the range of uncertainty.
let peer = sp.peer
# Treat empty response to a request starting from block 1 as equivalent to
# length 1 starting from block 0 in `peerSyncChainNonEmptyReply`. We treat
# every peer as if it would send genesis for block 0, without asking for it.
if request.skip == 0 and
not request.reverse and
not request.startBlock.isHash and
request.startBlock.number == 1.toBlockNumber:
try:
sp.lockSyncStateAndFetch(sp.global.chain.db.toGenesisHeader)
except RlpError as e:
raiseAssert "Gensis/chain problem (" & $e.name & "): " & e.msg
return
if sp.syncMode in {SyncLocked, SyncOnlyHash}:
inc sp.global.stats.ok.reorgDetected
trace "Peer reorg detected, best block disappeared", peer,
startBlock=request.startBlock
let lowestAbsent = request.startBlock.number
case sp.syncMode:
of SyncLocked:
# If this message doesn't change our knowledge, ignore it.
if lowestAbsent > sp.bestNumber:
return
# Due to a reorg, peer's canonical head has lower block number, outside
# our tracking window. Sync lock is no longer valid. Switch to hunt
# backward to find the new canonical head.
sp.setHuntBackward(lowestAbsent)
of SyncOnlyHash:
# Due to a reorg, peer doesn't have the block hash it originally gave us.
# Switch to hunt forward from block zero to find the canonical head.
sp.setHuntForward(0.toBlockNumber)
of HuntForward, HuntBackward, HuntRange, HuntRangeFinal:
# Update the hunt range.
sp.updateHuntAbsent(lowestAbsent)
# Update best block number. It is invalid except when `SyncLocked`, but
# still useful as a hint of what we knew recently, for example in displays.
if lowestAbsent <= sp.bestNumber:
sp.bestNumber =
if lowestAbsent == 0.toBlockNumber: lowestAbsent
else: lowestAbsent - 1.toBlockNumber
sp.bestHash = default(typeof(sp.bestHash))
proc peerSyncChainNonEmptyReply(
sp: SnapPivotWorkerRef;
request: BlocksRequest;
headers: openArray[BlockHeader]) =
## Handle non-empty `GetBlockHeaders` reply. This means `request.startBlock`
## is present on the peer and in its canonical chain (unless the request was
## made with a hash). If it's a short, contiguous, ascending order reply, it
## reveals the abrupt transition at the end of the chain and we have learned
## or reconfirmed the real-time head block. If hunting, this updates the
## range of uncertainty.
let
len = headers.len
highestIndex = if request.reverse: 0 else: len - 1
# We assume a short enough reply means we've learned the peer's canonical
# head, because it would have replied with another header if not at the head.
# This is not justified when the request used a general hash, because the
# peer doesn't have to reply with its canonical chain in that case, except it
# is still justified if the hash was the known canonical head, which is
# the case in a `SyncOnlyHash` request.
if len < syncLockedMinimumReply and
request.skip == 0 and not request.reverse and
len.uint < request.maxResults:
sp.lockSyncStateAndFetch(headers[highestIndex])
return
# Be careful, this number is from externally supplied data and arithmetic
# in the upward direction could overflow.
let highestPresent = headers[highestIndex].blockNumber
# A reply that isn't short enough for the canonical head criterion above
# tells us headers up to some number, but it doesn't tell us if there are
# more after it in the peer's canonical chain. We have to request more
# headers to find out.
case sp.syncMode:
of SyncLocked:
# If this message doesn't change our knowledge, ignore it.
if highestPresent <= sp.bestNumber:
return
# Sync lock is no longer valid as we don't have confirmed canonical head.
# Switch to hunt forward to find the new canonical head.
sp.setHuntForward(highestPresent)
of SyncOnlyHash:
# As `SyncLocked` but without the block number check.
sp.setHuntForward(highestPresent)
of HuntForward, HuntBackward, HuntRange, HuntRangeFinal:
# Update the hunt range.
sp.updateHuntPresent(highestPresent)
# Update best block number. It is invalid except when `SyncLocked`, but
# still useful as a hint of what we knew recently, for example in displays.
if highestPresent > sp.bestNumber:
sp.bestNumber = highestPresent
sp.bestHash = headers[highestIndex].blockHash.BlockHash
# ------------------------------------------------------------------------------
# Public functions, constructor
# ------------------------------------------------------------------------------
proc init*(
T: type SnapPivotCtxRef;
ctx: SnapCtxRef; ## For debugging
chain: Chain; ## Block chain database
): T =
T(ctx: ctx,
chain: chain)
proc clear*(sp: SnapPivotWorkerRef) =
sp.syncMode = HuntForward
sp.lowNumber = 0.toBlockNumber.BlockNumber
sp.highNumber = high(BlockNumber).BlockNumber
sp.bestNumber = 0.toBlockNumber.BlockNumber
sp.bestHash = sp.peer.state(protocol.eth).bestBlockHash.BlockHash
sp.step = 0u
proc init*(
T: type SnapPivotWorkerRef;
ctx: SnapPivotCtxRef; ## Global descriptor
ctrl: BuddyCtrlRef; ## Worker control start/stop
peer: Peer; ## Current network peer
): T =
result = T(global: ctx,
peer: peer,
ctrl: ctrl)
result.clear()
# TODO: Temporarily disabled because it's useful to test the worker.
# result.syncMode = SyncOnlyHash
# ------------------------------------------------------------------------------
# Public functions
# ------------------------------------------------------------------------------
proc pivotHeader*(sp: SnapPivotWorkerRef): Result[BlockHeader,void] =
## Returns cached block header if available
if sp.header.isSome:
let header = sp.header.unsafeGet
if header.blockNumber != 0:
return ok(header)
err()
proc pivotNegotiate*(
sp: SnapPivotWorkerRef;
ign: Option[BlockNumber]; ## Minimum block number to expect,ignored for now
): Future[bool]
{.async.} =
## Query a peer to update our knowledge of its canonical chain and its best
## block, which is its canonical chain head. This can be called at any time
## after a peer has negotiated the connection.
##
## This function is called in an exponential then binary search style
## during initial sync to find the canonical head, real-time polling
## afterwards to check for updates.
##
## All replies to this query are part of the peer's canonical chain at the
## time the peer sends them.
##
## This function can run in *multi mode*.
let peer = sp.peer
trace "Starting pivotExec()", peer
let request = sp.peerSyncChainRequest
trace trEthSendSendingGetBlockHeaders, peer,
count=request.maxResults,
startBlock=request.startBlock.pp, step=request.traceStep
inc sp.global.stats.ok.getBlockHeaders
var reply: Option[protocol.blockHeadersObj]
try:
reply = await peer.getBlockHeaders(request)
except CatchableError as e:
trace trEthRecvError & "waiting for GetBlockHeaders reply", peer,
error=e.msg
inc sp.global.stats.major.networkErrors
# Just try another peer
sp.ctrl.zombie = true
return false
if reply.isNone:
trace trEthRecvTimeoutWaiting & "for GetBlockHeaders reply", peer
# TODO: Should disconnect?
inc sp.global.stats.minor.timeoutBlockHeaders
return false
let nHeaders = reply.get.headers.len
if nHeaders == 0:
trace trEthRecvReceivedBlockHeaders, peer,
got=0, requested=request.maxResults
else:
trace trEthRecvReceivedBlockHeaders, peer,
got=nHeaders, requested=request.maxResults,
firstBlock=reply.get.headers[0].blockNumber,
lastBlock=reply.get.headers[^1].blockNumber
if request.maxResults.int < nHeaders:
trace trEthRecvProtocolViolation & "excess headers in BlockHeaders message",
peer, got=nHeaders, requested=request.maxResults
# TODO: Should disconnect.
inc sp.global.stats.major.excessBlockHeaders
return false
if 0 < nHeaders:
# TODO: Check this is not copying the `headers`.
sp.peerSyncChainNonEmptyReply(request, reply.get.headers)
else:
sp.peerSyncChainEmptyReply(request)
trace "Done pivotExec()", peer
return sp.header.isSome
# ------------------------------------------------------------------------------
# Debugging
# ------------------------------------------------------------------------------
proc pp*(sp: SnapPivotWorkerRef): string =
result &= "(mode=" & $sp.syncMode
result &= ",num=(" & sp.lowNumber.pp & "," & sp.highNumber.pp & ")"
result &= ",best=(" & sp.bestNumber.pp & "," & sp.bestHash.pp & ")"
result &= ",step=" & $sp.step
result &= ")"
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------
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