nimbus-eth2/beacon_chain/sync_protocol.nim

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Nim
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import
options, tables, sets, macros,
chronicles, chronos, stew/ranges/bitranges, libp2p/switch,
spec/[datatypes, crypto, digest],
beacon_node_types, eth2_network,
block_pools/chain_dag
logScope:
topics = "sync"
const
MAX_REQUEST_BLOCKS = 1024
type
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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:
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pubkey: ValidatorPubKey
else:
index: uint32
BeaconBlockCallback* = proc(signedBlock: SignedBeaconBlock) {.gcsafe.}
BeaconSyncNetworkState* = ref object
chainDag*: ChainDAGRef
forkDigest*: ForkDigest
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BeaconSyncPeerState* = ref object
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statusMsg*: StatusMsg
BlockRootSlot* = object
blockRoot: Eth2Digest
slot: Slot
BlockRootsList* = List[Eth2Digest, Limit MAX_REQUEST_BLOCKS]
proc 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 & ")"
proc getCurrentStatus*(state: BeaconSyncNetworkState): StatusMsg {.gcsafe.} =
let
chainDag = state.chainDag
headBlock = chainDag.head
StatusMsg(
forkDigest: state.forkDigest,
finalizedRoot: chainDag.headState.data.data.finalized_checkpoint.root,
finalizedEpoch: chainDag.headState.data.data.finalized_checkpoint.epoch,
headRoot: headBlock.root,
headSlot: headBlock.slot)
proc handleStatus(peer: Peer,
state: BeaconSyncNetworkState,
ourStatus: StatusMsg,
theirStatus: StatusMsg): Future[void] {.gcsafe.}
proc setStatusMsg(peer: Peer, statusMsg: StatusMsg) {.gcsafe.}
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p2pProtocol BeaconSync(version = 1,
networkState = BeaconSyncNetworkState,
peerState = BeaconSyncPeerState):
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onPeerConnected do (peer: Peer, incoming: bool) {.async.}:
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debug "Peer connected",
peer, peerInfo = shortLog(peer.info), 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 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()
# TODO: The timeout here is so high only because we fail to
# respond in time due to high CPU load in our single thread.
theirStatus = await peer.status(ourStatus, timeout = 60.seconds)
if theirStatus.isOk:
await peer.handleStatus(peer.networkState,
ourStatus, theirStatus.get())
else:
warn "Status response not received in time",
peer, error = theirStatus.error
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proc status(peer: Peer,
theirStatus: StatusMsg,
response: SingleChunkResponse[StatusMsg])
{.async, libp2pProtocol("status", 1).} =
let ourStatus = peer.networkState.getCurrentStatus()
trace "Sending status message", peer = peer, status = ourStatus
await response.send(ourStatus)
await peer.handleStatus(peer.networkState, ourStatus, theirStatus)
proc ping(peer: Peer, value: uint64): uint64
{.libp2pProtocol("ping", 1).} =
return peer.network.metadata.seq_number
proc getMetadata(peer: Peer): Eth2Metadata
{.libp2pProtocol("metadata", 1).} =
return peer.network.metadata
proc beaconBlocksByRange(
peer: Peer,
startSlot: Slot,
reqCount: uint64,
reqStep: uint64,
response: MultipleChunksResponse[SignedBeaconBlock])
{.async, libp2pProtocol("beacon_blocks_by_range", 1).} =
trace "got range request", peer, startSlot,
count = reqCount, step = reqStep
if reqCount > 0'u64:
var blocks: array[MAX_REQUEST_BLOCKS, BlockRef]
let
chainDag = peer.networkState.chainDag
# Limit number of blocks in response
count = int min(reqCount, blocks.lenu64)
let
endIndex = count - 1
startIndex =
chainDag.getBlockRange(startSlot, reqStep,
blocks.toOpenArray(0, endIndex))
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for i in startIndex..endIndex:
doAssert not blocks[i].isNil, "getBlockRange should return non-nil blocks only"
trace "wrote response block",
slot = blocks[i].slot, roor = shortLog(blocks[i].root)
await response.write(chainDag.get(blocks[i]).data)
debug "Block range request done",
peer, startSlot, count, reqStep, found = count - startIndex
proc beaconBlocksByRoot(
peer: Peer,
# Please note that the SSZ list here ensures that the
# spec constant MAX_REQUEST_BLOCKS is enforced:
blockRoots: BlockRootsList,
response: MultipleChunksResponse[SignedBeaconBlock])
{.async, libp2pProtocol("beacon_blocks_by_root", 1).} =
let
chainDag = peer.networkState.chainDag
count = blockRoots.len
var found = 0
for i in 0..<count:
let blockRef = chainDag.getRef(blockRoots[i])
if not isNil(blockRef):
await response.write(chainDag.get(blockRef).data)
inc found
debug "Block root request done",
peer, roots = blockRoots.len, count, found
proc goodbye(peer: Peer,
reason: uint64)
{.async, libp2pProtocol("goodbye", 1).} =
debug "Received Goodbye message", reason = disconnectReasonName(reason), peer
proc setStatusMsg(peer: Peer, statusMsg: StatusMsg) =
debug "Peer status", peer, statusMsg
peer.state(BeaconSync).statusMsg = statusMsg
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 = chronos.seconds(60))
if theirFut.failed():
result = false
else:
let theirStatus = theirFut.read()
if theirStatus.isOk:
peer.setStatusMsg(theirStatus.get)
result = true
proc getHeadSlot*(peer: Peer): Slot {.inline.} =
## Returns head slot for specific peer ``peer``.
result = peer.state(BeaconSync).statusMsg.headSlot
proc handleStatus(peer: Peer,
state: BeaconSyncNetworkState,
ourStatus: StatusMsg,
theirStatus: StatusMsg) {.async, gcsafe.} =
if theirStatus.forkDigest != state.forkDigest:
notice "Irrelevant peer", peer, theirStatus, ourStatus
await peer.disconnect(IrrelevantNetwork)
else:
peer.setStatusMsg(theirStatus)
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proc initBeaconSync*(network: Eth2Node, chainDag: ChainDAGRef,
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forkDigest: ForkDigest) =
var networkState = network.protocolState(BeaconSync)
networkState.chainDag = chainDag
networkState.forkDigest = forkDigest