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nimbus-eth2/beacon_chain/sync/sync_protocol.nim

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# beacon_chain
# Copyright (c) 2018-2023 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: [].}
import
std/[tables, sets, macros],
chronicles, chronos, snappy, snappy/codec,
libp2p/switch,
../spec/datatypes/[phase0, altair, bellatrix, capella, deneb],
../spec/[helpers, forks, network],
".."/[beacon_clock],
../networking/eth2_network,
../consensus_object_pools/blockchain_dag,
../rpc/rest_constants
logScope:
topics = "sync"
const
blockResponseCost = allowedOpsPerSecondCost(64) # Allow syncing ~64 blocks/sec (minus request costs)
lightClientBootstrapResponseCost = allowedOpsPerSecondCost(1)
## Only one bootstrap per peer should ever be needed - no need to allow more
lightClientUpdateResponseCost = allowedOpsPerSecondCost(1000)
## Updates are tiny - we can allow lots of them
lightClientFinalityUpdateResponseCost = allowedOpsPerSecondCost(100)
lightClientOptimisticUpdateResponseCost = allowedOpsPerSecondCost(100)
type
StatusMsg* = object
forkDigest*: ForkDigest
finalizedRoot*: Eth2Digest
finalizedEpoch*: Epoch
headRoot*: Eth2Digest
headSlot*: Slot
ValidatorSetDeltaFlags {.pure.} = enum
Activation = 0
Exit = 1
ValidatorChangeLogEntry* = object
case kind*: ValidatorSetDeltaFlags
of Activation:
pubkey: ValidatorPubKey
else:
index: uint32
BeaconSyncNetworkState = ref object
dag: ChainDAGRef
cfg: RuntimeConfig
forkDigests: ref ForkDigests
genesisBlockRoot: Eth2Digest
getBeaconTime: GetBeaconTimeFn
BeaconSyncPeerState* = ref object
statusLastTime*: chronos.Moment
statusMsg*: StatusMsg
BlockRootSlot* = object
blockRoot: Eth2Digest
slot: Slot
BlockRootsList* = List[Eth2Digest, Limit MAX_REQUEST_BLOCKS]
BlobIdentifierList* = List[BlobIdentifier, Limit (MAX_REQUEST_BLOB_SIDECARS)]
template readChunkPayload*(
conn: Connection, peer: Peer, MsgType: type ForkySignedBeaconBlock):
Future[NetRes[MsgType]] =
readChunkPayload(conn, peer, MsgType)
proc readChunkPayload*(
conn: Connection, peer: Peer, MsgType: type (ref ForkedSignedBeaconBlock)):
Future[NetRes[MsgType]] {.async.} =
var contextBytes: ForkDigest
try:
await conn.readExactly(addr contextBytes, sizeof contextBytes)
except CatchableError:
return neterr UnexpectedEOF
if contextBytes == peer.network.forkDigests.phase0:
let res = await readChunkPayload(conn, peer, phase0.SignedBeaconBlock)
if res.isOk:
return ok newClone(ForkedSignedBeaconBlock.init(res.get))
else:
return err(res.error)
elif contextBytes == peer.network.forkDigests.altair:
let res = await readChunkPayload(conn, peer, altair.SignedBeaconBlock)
if res.isOk:
return ok newClone(ForkedSignedBeaconBlock.init(res.get))
else:
return err(res.error)
elif contextBytes == peer.network.forkDigests.bellatrix:
let res = await readChunkPayload(conn, peer, bellatrix.SignedBeaconBlock)
if res.isOk:
return ok newClone(ForkedSignedBeaconBlock.init(res.get))
else:
return err(res.error)
elif contextBytes == peer.network.forkDigests.capella:
let res = await readChunkPayload(conn, peer, capella.SignedBeaconBlock)
if res.isOk:
return ok newClone(ForkedSignedBeaconBlock.init(res.get))
else:
return err(res.error)
elif contextBytes == peer.network.forkDigests.deneb:
let res = await readChunkPayload(conn, peer, deneb.SignedBeaconBlock)
if res.isOk:
return ok newClone(ForkedSignedBeaconBlock.init(res.get))
else:
return err(res.error)
else:
return neterr InvalidContextBytes
proc readChunkPayload*(
conn: Connection, peer: Peer, MsgType: type (ref BlobSidecar)):
Future[NetRes[MsgType]] {.async.} =
var contextBytes: ForkDigest
try:
await conn.readExactly(addr contextBytes, sizeof contextBytes)
except CatchableError:
return neterr UnexpectedEOF
if contextBytes == peer.network.forkDigests.deneb:
let res = await readChunkPayload(conn, peer, BlobSidecar)
if res.isOk:
return ok newClone(res.get)
else:
return err(res.error)
else:
return neterr InvalidContextBytes
proc readChunkPayload*(
conn: Connection, peer: Peer, MsgType: type SomeForkedLightClientObject):
Future[NetRes[MsgType]] {.async.} =
var contextBytes: ForkDigest
try:
await conn.readExactly(addr contextBytes, sizeof contextBytes)
except CatchableError:
return neterr UnexpectedEOF
let contextFork =
peer.network.forkDigests[].consensusForkForDigest(contextBytes).valueOr:
return neterr InvalidContextBytes
withLcDataFork(lcDataForkAtConsensusFork(contextFork)):
when lcDataFork > LightClientDataFork.None:
let res = await eth2_network.readChunkPayload(
conn, peer, MsgType.Forky(lcDataFork))
if res.isOk:
if contextFork !=
peer.network.cfg.consensusForkAtEpoch(res.get.contextEpoch):
return neterr InvalidContextBytes
var obj = ok MsgType(kind: lcDataFork)
obj.get.forky(lcDataFork) = res.get
return obj
else:
return err(res.error)
else:
return neterr InvalidContextBytes
func shortLog*(s: StatusMsg): auto =
(
forkDigest: s.forkDigest,
finalizedRoot: shortLog(s.finalizedRoot),
finalizedEpoch: shortLog(s.finalizedEpoch),
headRoot: shortLog(s.headRoot),
headSlot: shortLog(s.headSlot)
)
chronicles.formatIt(StatusMsg): shortLog(it)
func disconnectReasonName(reason: uint64): string =
# haha, nim doesn't support uint64 in `case`!
if reason == uint64(ClientShutDown): "Client shutdown"
elif reason == uint64(IrrelevantNetwork): "Irrelevant network"
elif reason == uint64(FaultOrError): "Fault or error"
else: "Disconnected (" & $reason & ")"
func forkDigestAtEpoch(state: BeaconSyncNetworkState,
epoch: Epoch): ForkDigest =
state.forkDigests[].atEpoch(epoch, state.cfg)
proc getCurrentStatus(state: BeaconSyncNetworkState): StatusMsg =
let
dag = state.dag
wallSlot = state.getBeaconTime().slotOrZero
if dag != nil:
StatusMsg(
forkDigest: state.forkDigestAtEpoch(wallSlot.epoch),
finalizedRoot: dag.finalizedHead.blck.root,
finalizedEpoch: dag.finalizedHead.slot.epoch,
headRoot: dag.head.root,
headSlot: dag.head.slot)
else:
StatusMsg(
forkDigest: state.forkDigestAtEpoch(wallSlot.epoch),
finalizedRoot: state.genesisBlockRoot,
finalizedEpoch: GENESIS_EPOCH,
headRoot: state.genesisBlockRoot,
headSlot: GENESIS_SLOT)
proc checkStatusMsg(state: BeaconSyncNetworkState, status: StatusMsg):
Result[void, cstring] =
let
dag = state.dag
wallSlot = (state.getBeaconTime() + MAXIMUM_GOSSIP_CLOCK_DISPARITY).slotOrZero
if status.finalizedEpoch > status.headSlot.epoch:
# Can be equal during genesis or checkpoint start
return err("finalized epoch newer than head")
if status.headSlot > wallSlot:
return err("head more recent than wall clock")
if state.forkDigestAtEpoch(wallSlot.epoch) != status.forkDigest:
return err("fork digests differ")
if dag != nil:
if status.finalizedEpoch <= dag.finalizedHead.slot.epoch:
let blockId = dag.getBlockIdAtSlot(status.finalizedEpoch.start_slot())
if blockId.isSome and
(not status.finalizedRoot.isZero) and
status.finalizedRoot != blockId.get().bid.root:
return err("peer following different finality")
else:
if status.finalizedEpoch == GENESIS_EPOCH:
if status.finalizedRoot != state.genesisBlockRoot:
return err("peer following different finality")
ok()
proc handleStatus(peer: Peer,
state: BeaconSyncNetworkState,
theirStatus: StatusMsg): Future[bool] {.gcsafe.}
proc setStatusMsg(peer: Peer, statusMsg: StatusMsg) {.gcsafe.}
{.pop.} # TODO fix p2p macro for raises
p2pProtocol BeaconSync(version = 1,
networkState = BeaconSyncNetworkState,
peerState = BeaconSyncPeerState):
onPeerConnected do (peer: Peer, incoming: bool) {.async.}:
debug "Peer connected",
peer, peerId = shortLog(peer.peerId), incoming
# Per the eth2 protocol, whoever dials must send a status message when
# connected for the first time, but because of how libp2p works, there may
# be a race between incoming and outgoing connections and disconnects that
# makes the incoming flag unreliable / obsolete by the time we get to
# this point - instead of making assumptions, we'll just send a status
# message redundantly.
# TODO(zah)
# the spec does not prohibit sending the extra status message on
# incoming connections, but it should not be necessary - this would
# need a dedicated flow in libp2p that resolves the race conditions -
# this needs more thinking around the ordering of events and the
# given incoming flag
let
ourStatus = peer.networkState.getCurrentStatus()
theirStatus = await peer.status(ourStatus, timeout = RESP_TIMEOUT)
if theirStatus.isOk:
discard await peer.handleStatus(peer.networkState, theirStatus.get())
else:
debug "Status response not received in time",
peer, errorKind = theirStatus.error.kind
await peer.disconnect(FaultOrError)
proc status(peer: Peer,
theirStatus: StatusMsg,
response: SingleChunkResponse[StatusMsg])
{.async, libp2pProtocol("status", 1, isRequired = true).} =
let ourStatus = peer.networkState.getCurrentStatus()
trace "Sending status message", peer = peer, status = ourStatus
await response.send(ourStatus)
discard await peer.handleStatus(peer.networkState, theirStatus)
proc ping(peer: Peer, value: uint64): uint64
{.libp2pProtocol("ping", 1, isRequired = true).} =
return peer.network.metadata.seq_number
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/p2p-interface.md#transitioning-from-v1-to-v2
proc getMetaData(peer: Peer): uint64
{.libp2pProtocol("metadata", 1, isRequired = true).} =
raise newException(InvalidInputsError, "GetMetaData v1 unsupported")
proc getMetadata_v2(peer: Peer): altair.MetaData
{.libp2pProtocol("metadata", 2, isRequired = true).} =
return peer.network.metadata
proc beaconBlocksByRange_v2(
peer: Peer,
startSlot: Slot,
reqCount: uint64,
reqStep: uint64,
response: MultipleChunksResponse[
ref ForkedSignedBeaconBlock, MAX_REQUEST_BLOCKS])
{.async, libp2pProtocol("beacon_blocks_by_range", 2).} =
# TODO Semantically, this request should return a non-ref, but doing so
# runs into extreme inefficiency due to the compiler introducing
# hidden copies - in future nim versions with move support, this should
# be revisited
# TODO This code is more complicated than it needs to be, since the type
# of the multiple chunks response is not actually used in this server
# implementation (it's used to derive the signature of the client
# function, not in the code below!)
# TODO although you can't tell from this function definition, a magic
# client call that returns `seq[ref ForkedSignedBeaconBlock]` will
# will be generated by the libp2p macro - we guarantee that seq items
# are `not-nil` in the implementation
# TODO reqStep is deprecated - future versions can remove support for
# values != 1: https://github.com/ethereum/consensus-specs/pull/2856
trace "got range request", peer, startSlot,
count = reqCount, step = reqStep
if reqCount == 0 or reqStep == 0:
raise newException(InvalidInputsError, "Empty range requested")
var blocks: array[MAX_REQUEST_BLOCKS, BlockId]
let
dag = peer.networkState.dag
# Limit number of blocks in response
count = int min(reqCount, blocks.lenu64)
endIndex = count - 1
startIndex =
dag.getBlockRange(startSlot, reqStep,
blocks.toOpenArray(0, endIndex))
var
found = 0
bytes: seq[byte]
for i in startIndex..endIndex:
if dag.getBlockSZ(blocks[i], bytes):
# In general, there is not much intermediate time between post-merge
# blocks all being optimistic and none of them being optimistic. The
# EL catches up, tells the CL the head is verified, and that's it.
if blocks[i].slot.epoch >= dag.cfg.BELLATRIX_FORK_EPOCH and
dag.is_optimistic(dag.head.root):
continue
let uncompressedLen = uncompressedLenFramed(bytes).valueOr:
warn "Cannot read block size, database corrupt?",
bytes = bytes.len(), blck = shortLog(blocks[i])
continue
# TODO extract from libp2pProtocol
peer.awaitQuota(blockResponseCost, "beacon_blocks_by_range/2")
peer.network.awaitQuota(blockResponseCost, "beacon_blocks_by_range/2")
await response.writeBytesSZ(
uncompressedLen, bytes,
peer.networkState.forkDigestAtEpoch(blocks[i].slot.epoch).data)
inc found
debug "Block range request done",
peer, startSlot, count, reqStep
proc beaconBlocksByRoot_v2(
peer: Peer,
# Please note that the SSZ list here ensures that the
# spec constant MAX_REQUEST_BLOCKS is enforced:
blockRoots: BlockRootsList,
response: MultipleChunksResponse[
ref ForkedSignedBeaconBlock, MAX_REQUEST_BLOCKS])
{.async, libp2pProtocol("beacon_blocks_by_root", 2).} =
# TODO Semantically, this request should return a non-ref, but doing so
# runs into extreme inefficiency due to the compiler introducing
# hidden copies - in future nim versions with move support, this should
# be revisited
# TODO This code is more complicated than it needs to be, since the type
# of the multiple chunks response is not actually used in this server
# implementation (it's used to derive the signature of the client
# function, not in the code below!)
# TODO although you can't tell from this function definition, a magic
# client call that returns `seq[ref ForkedSignedBeaconBlock]` will
# will be generated by the libp2p macro - we guarantee that seq items
# are `not-nil` in the implementation
if blockRoots.len == 0:
raise newException(InvalidInputsError, "No blocks requested")
let
dag = peer.networkState.dag
count = blockRoots.len
var
found = 0
bytes: seq[byte]
for i in 0..<count:
let
blockRef = dag.getBlockRef(blockRoots[i]).valueOr:
continue
if dag.getBlockSZ(blockRef.bid, bytes):
# In general, there is not much intermediate time between post-merge
# blocks all being optimistic and none of them being optimistic. The
# EL catches up, tells the CL the head is verified, and that's it.
if blockRef.slot.epoch >= dag.cfg.BELLATRIX_FORK_EPOCH and
dag.is_optimistic(dag.head.root):
continue
let uncompressedLen = uncompressedLenFramed(bytes).valueOr:
warn "Cannot read block size, database corrupt?",
bytes = bytes.len(), blck = shortLog(blockRef)
continue
# TODO extract from libp2pProtocol
peer.awaitQuota(blockResponseCost, "beacon_blocks_by_root/2")
peer.network.awaitQuota(blockResponseCost, "beacon_blocks_by_root/2")
await response.writeBytesSZ(
uncompressedLen, bytes,
peer.networkState.forkDigestAtEpoch(blockRef.slot.epoch).data)
inc found
debug "Block root request done",
peer, roots = blockRoots.len, count, found
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/deneb/p2p-interface.md#blobsidecarsbyroot-v1
proc blobSidecarsByRoot(
peer: Peer,
blobIds: BlobIdentifierList,
response: MultipleChunksResponse[
ref BlobSidecar, Limit(MAX_REQUEST_BLOB_SIDECARS)])
{.async, libp2pProtocol("blob_sidecars_by_root", 1).} =
# TODO Semantically, this request should return a non-ref, but doing so
# runs into extreme inefficiency due to the compiler introducing
# hidden copies - in future nim versions with move support, this should
# be revisited
# TODO This code is more complicated than it needs to be, since the type
# of the multiple chunks response is not actually used in this server
# implementation (it's used to derive the signature of the client
# function, not in the code below!)
# TODO although you can't tell from this function definition, a magic
# client call that returns `seq[ref BlobSidecar]` will
# will be generated by the libp2p macro - we guarantee that seq items
# are `not-nil` in the implementation
trace "got blobs range request", peer, len = blobIds.len
if blobIds.len == 0:
raise newException(InvalidInputsError, "No blobs requested")
let
dag = peer.networkState.dag
count = blobIds.len
var
found = 0
bytes: seq[byte]
for i in 0..<count:
let blockRef = dag.getBlockRef(blobIds[i].block_root).valueOr:
continue
let index = blobIds[i].index
if dag.db.getBlobSidecarSZ(blockRef.bid.root, index, bytes):
let uncompressedLen = uncompressedLenFramed(bytes).valueOr:
warn "Cannot read blob size, database corrupt?",
bytes = bytes.len(), blck = shortLog(blockRef), blobindex = index
continue
peer.awaitQuota(blockResponseCost, "blob_sidecars_by_root/1")
peer.network.awaitQuota(blockResponseCost, "blob_sidecars_by_root/1")
await response.writeBytesSZ(
uncompressedLen, bytes,
peer.networkState.forkDigestAtEpoch(blockRef.slot.epoch).data)
inc found
debug "Blob root request done",
peer, roots = blobIds.len, count, found
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/p2p-interface.md#blobsidecarsbyrange-v1
proc blobSidecarsByRange(
peer: Peer,
startSlot: Slot,
reqCount: uint64,
response: MultipleChunksResponse[
ref BlobSidecar, Limit(MAX_REQUEST_BLOB_SIDECARS)])
{.async, libp2pProtocol("blob_sidecars_by_range", 1).} =
# TODO This code is more complicated than it needs to be, since the type
# of the multiple chunks response is not actually used in this server
# implementation (it's used to derive the signature of the client
# function, not in the code below!)
# TODO although you can't tell from this function definition, a magic
# client call that returns `seq[ref BlobSidecar]` will
# will be generated by the libp2p macro - we guarantee that seq items
# are `not-nil` in the implementation
trace "got blobs range request", peer, startSlot, count = reqCount
if reqCount == 0:
raise newException(InvalidInputsError, "Empty range requested")
let
dag = peer.networkState.dag
epochBoundary =
if MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS >= dag.head.slot.epoch:
GENESIS_EPOCH
else:
dag.head.slot.epoch - MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS
if startSlot.epoch < epochBoundary:
raise newException(ResourceUnavailableError, BlobsOutOfRange)
var blockIds: array[int(MAX_REQUEST_BLOB_SIDECARS), BlockId]
let
count = int min(reqCount, blockIds.lenu64)
endIndex = count - 1
startIndex =
dag.getBlockRange(startSlot, 1, blockIds.toOpenArray(0, endIndex))
var
found = 0
bytes: seq[byte]
for i in startIndex..endIndex:
for j in 0..<MAX_BLOBS_PER_BLOCK:
if dag.db.getBlobSidecarSZ(blockIds[i].root, BlobIndex(j), bytes):
# In general, there is not much intermediate time between post-merge
# blocks all being optimistic and none of them being optimistic. The
# EL catches up, tells the CL the head is verified, and that's it.
if blockIds[i].slot.epoch >= dag.cfg.BELLATRIX_FORK_EPOCH and
dag.is_optimistic(dag.head.root):
continue
let uncompressedLen = uncompressedLenFramed(bytes).valueOr:
warn "Cannot read blobs sidecar size, database corrupt?",
bytes = bytes.len(), blck = shortLog(blockIds[i])
continue
# TODO extract from libp2pProtocol
peer.awaitQuota(blockResponseCost, "blobs_sidecars_by_range/1")
peer.network.awaitQuota(blockResponseCost, "blobs_sidecars_by_range/1")
await response.writeBytesSZ(
uncompressedLen, bytes,
peer.networkState.forkDigestAtEpoch(blockIds[i].slot.epoch).data)
inc found
else:
break
debug "BlobSidecar range request done",
peer, startSlot, found
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
proc lightClientBootstrap(
peer: Peer,
blockRoot: Eth2Digest,
response: SingleChunkResponse[ForkedLightClientBootstrap])
{.async, libp2pProtocol("light_client_bootstrap", 1,
isLightClientRequest = true).} =
trace "Received LC bootstrap request", peer, blockRoot
let dag = peer.networkState.dag
doAssert dag.lcDataStore.serve
let bootstrap = dag.getLightClientBootstrap(blockRoot)
withForkyBootstrap(bootstrap):
when lcDataFork > LightClientDataFork.None:
let
contextEpoch = forkyBootstrap.contextEpoch
contextBytes = peer.networkState.forkDigestAtEpoch(contextEpoch).data
# TODO extract from libp2pProtocol
peer.awaitQuota(
lightClientBootstrapResponseCost,
"light_client_bootstrap/1")
await response.sendSSZ(forkyBootstrap, contextBytes)
else:
raise newException(ResourceUnavailableError, LCBootstrapUnavailable)
debug "LC bootstrap request done", peer, blockRoot
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
proc lightClientUpdatesByRange(
peer: Peer,
startPeriod: SyncCommitteePeriod,
reqCount: uint64,
response: MultipleChunksResponse[
ForkedLightClientUpdate, MAX_REQUEST_LIGHT_CLIENT_UPDATES])
{.async, libp2pProtocol("light_client_updates_by_range", 1,
isLightClientRequest = true).} =
trace "Received LC updates by range request", peer, startPeriod, reqCount
let dag = peer.networkState.dag
doAssert dag.lcDataStore.serve
let
headPeriod = dag.head.slot.sync_committee_period
# Limit number of updates in response
maxSupportedCount =
if startPeriod > headPeriod:
0'u64
else:
min(headPeriod + 1 - startPeriod, MAX_REQUEST_LIGHT_CLIENT_UPDATES)
count = min(reqCount, maxSupportedCount)
onePastPeriod = startPeriod + count
var found = 0
for period in startPeriod..<onePastPeriod:
let update = dag.getLightClientUpdateForPeriod(period)
withForkyUpdate(update):
when lcDataFork > LightClientDataFork.None:
let
contextEpoch = forkyUpdate.contextEpoch
contextBytes =
peer.networkState.forkDigestAtEpoch(contextEpoch).data
# TODO extract from libp2pProtocol
peer.awaitQuota(
lightClientUpdateResponseCost,
"light_client_updates_by_range/1")
await response.writeSSZ(forkyUpdate, contextBytes)
inc found
else:
discard
debug "LC updates by range request done", peer, startPeriod, count, found
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
proc lightClientFinalityUpdate(
peer: Peer,
response: SingleChunkResponse[ForkedLightClientFinalityUpdate])
{.async, libp2pProtocol("light_client_finality_update", 1,
isLightClientRequest = true).} =
trace "Received LC finality update request", peer
let dag = peer.networkState.dag
doAssert dag.lcDataStore.serve
let finality_update = dag.getLightClientFinalityUpdate()
withForkyFinalityUpdate(finality_update):
when lcDataFork > LightClientDataFork.None:
let
contextEpoch = forkyFinalityUpdate.contextEpoch
contextBytes = peer.networkState.forkDigestAtEpoch(contextEpoch).data
# TODO extract from libp2pProtocol
peer.awaitQuota(
lightClientFinalityUpdateResponseCost,
"light_client_finality_update/1")
await response.sendSSZ(forkyFinalityUpdate, contextBytes)
else:
raise newException(ResourceUnavailableError, LCFinUpdateUnavailable)
debug "LC finality update request done", peer
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
proc lightClientOptimisticUpdate(
peer: Peer,
response: SingleChunkResponse[ForkedLightClientOptimisticUpdate])
{.async, libp2pProtocol("light_client_optimistic_update", 1,
isLightClientRequest = true).} =
trace "Received LC optimistic update request", peer
let dag = peer.networkState.dag
doAssert dag.lcDataStore.serve
let optimistic_update = dag.getLightClientOptimisticUpdate()
withForkyOptimisticUpdate(optimistic_update):
when lcDataFork > LightClientDataFork.None:
let
contextEpoch = forkyOptimisticUpdate.contextEpoch
contextBytes = peer.networkState.forkDigestAtEpoch(contextEpoch).data
# TODO extract from libp2pProtocol
peer.awaitQuota(
lightClientOptimisticUpdateResponseCost,
"light_client_optimistic_update/1")
await response.sendSSZ(forkyOptimisticUpdate, contextBytes)
else:
raise newException(ResourceUnavailableError, LCOptUpdateUnavailable)
debug "LC optimistic update request done", peer
proc goodbye(peer: Peer,
reason: uint64)
{.async, libp2pProtocol("goodbye", 1, isRequired = true).} =
debug "Received Goodbye message", reason = disconnectReasonName(reason), peer
proc setStatusMsg(peer: Peer, statusMsg: StatusMsg) =
debug "Peer status", peer, statusMsg
peer.state(BeaconSync).statusMsg = statusMsg
peer.state(BeaconSync).statusLastTime = Moment.now()
proc handleStatus(peer: Peer,
state: BeaconSyncNetworkState,
theirStatus: StatusMsg): Future[bool] {.async, gcsafe.} =
let
res = checkStatusMsg(state, theirStatus)
return if res.isErr():
debug "Irrelevant peer", peer, theirStatus, err = res.error()
await peer.disconnect(IrrelevantNetwork)
false
else:
peer.setStatusMsg(theirStatus)
if peer.connectionState == Connecting:
# As soon as we get here it means that we passed handshake succesfully. So
# we can add this peer to PeerPool.
await peer.handlePeer()
true
proc updateStatus*(peer: Peer): Future[bool] {.async.} =
## Request `status` of remote peer ``peer``.
let
nstate = peer.networkState(BeaconSync)
ourStatus = getCurrentStatus(nstate)
let theirFut = awaitne peer.status(ourStatus, timeout = RESP_TIMEOUT)
if theirFut.failed():
return false
else:
let theirStatus = theirFut.read()
if theirStatus.isOk:
return await peer.handleStatus(nstate, theirStatus.get())
else:
return false
proc getHeadSlot*(peer: Peer): Slot =
## Returns head slot for specific peer ``peer``.
peer.state(BeaconSync).statusMsg.headSlot
proc getFinalizedEpoch*(peer: Peer): Epoch =
## Returns head slot for specific peer ``peer``.
peer.state(BeaconSync).statusMsg.finalizedEpoch
proc initBeaconSync*(network: Eth2Node, dag: ChainDAGRef,
getBeaconTime: GetBeaconTimeFn) =
var networkState = network.protocolState(BeaconSync)
networkState.dag = dag
networkState.cfg = dag.cfg
networkState.forkDigests = dag.forkDigests
networkState.genesisBlockRoot = dag.genesisBlockRoot
networkState.getBeaconTime = getBeaconTime
proc initBeaconSync*(network: Eth2Node,
cfg: RuntimeConfig,
forkDigests: ref ForkDigests,
genesisBlockRoot: Eth2Digest,
getBeaconTime: GetBeaconTimeFn) =
var networkState = network.protocolState(BeaconSync)
networkState.dag = nil
networkState.cfg = cfg
networkState.forkDigests = forkDigests
networkState.genesisBlockRoot = genesisBlockRoot
networkState.getBeaconTime = getBeaconTime
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