238 lines
7.6 KiB
Nim
238 lines
7.6 KiB
Nim
import
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options, tables, sets, macros,
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chronicles, chronos, metrics, stew/ranges/bitranges,
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spec/[datatypes, crypto, digest, helpers], eth/rlp,
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beacon_node_types, eth2_network, beacon_chain_db, block_pool, ssz
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when networkBackend == rlpxBackend:
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import eth/rlp/options as rlpOptions
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template libp2pProtocol*(name: string, version: int) {.pragma.}
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declarePublicGauge libp2p_peers, "Number of libp2p peers"
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type
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ValidatorSetDeltaFlags {.pure.} = enum
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Activation = 0
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Exit = 1
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ValidatorChangeLogEntry* = object
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case kind*: ValidatorSetDeltaFlags
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of Activation:
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pubkey: ValidatorPubKey
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else:
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index: uint32
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ValidatorSet = seq[Validator]
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BeaconSyncNetworkState* = ref object
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node*: BeaconNode
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db*: BeaconChainDB
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BeaconSyncPeerState* = ref object
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initialStatusReceived: bool
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BlockRootSlot* = object
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blockRoot: Eth2Digest
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slot: Slot
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const
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MAX_REQUESTED_BLOCKS = 20'u64
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MaxAncestorBlocksResponse = 256
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func toHeader(b: BeaconBlock): BeaconBlockHeader =
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BeaconBlockHeader(
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slot: b.slot,
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parent_root: b.parent_root,
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state_root: b.state_root,
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body_root: hash_tree_root(b.body),
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signature: b.signature
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)
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proc fromHeaderAndBody(b: var BeaconBlock, h: BeaconBlockHeader, body: BeaconBlockBody) =
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doAssert(hash_tree_root(body) == h.body_root)
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b.slot = h.slot
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b.parent_root = h.parent_root
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b.state_root = h.state_root
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b.body = body
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b.signature = h.signature
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proc importBlocks(node: BeaconNode,
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blocks: openarray[BeaconBlock]) =
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for blk in blocks:
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node.onBeaconBlock(node, blk)
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info "Forward sync imported blocks", len = blocks.len
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type
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StatusMsg = object
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forkVersion*: array[4, byte]
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finalizedRoot*: Eth2Digest
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finalizedEpoch*: Epoch
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headRoot*: Eth2Digest
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headSlot*: Slot
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proc getCurrentStatus(node: BeaconNode): StatusMsg =
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let
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blockPool = node.blockPool
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finalizedHead = blockPool.finalizedHead
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headBlock = blockPool.head.blck
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headRoot = headBlock.root
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headSlot = headBlock.slot
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finalizedEpoch = finalizedHead.slot.compute_epoch_at_slot()
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StatusMsg(
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fork_version: node.forkVersion,
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finalizedRoot: finalizedHead.blck.root,
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finalizedEpoch: finalizedEpoch,
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headRoot: headRoot,
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headSlot: headSlot)
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proc handleInitialStatus(peer: Peer,
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node: BeaconNode,
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ourStatus: StatusMsg,
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theirStatus: StatusMsg) {.async, gcsafe.}
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p2pProtocol BeaconSync(version = 1,
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rlpxName = "bcs",
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networkState = BeaconSyncNetworkState,
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peerState = BeaconSyncPeerState):
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onPeerConnected do (peer: Peer):
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if peer.wasDialed:
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let
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node = peer.networkState.node
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ourStatus = node.getCurrentStatus
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theirStatus = await peer.status(ourStatus)
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if theirStatus.isSome:
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await peer.handleInitialStatus(node, ourStatus, theirStatus.get)
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else:
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warn "Status response not received in time"
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onPeerDisconnected do (peer: Peer):
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libp2p_peers.set peer.network.peers.len.int64
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requestResponse:
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proc status(peer: Peer, theirStatus: StatusMsg) {.libp2pProtocol("status", 1).} =
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let
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node = peer.networkState.node
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ourStatus = node.getCurrentStatus
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await response.send(ourStatus)
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if not peer.state.initialStatusReceived:
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peer.state.initialStatusReceived = true
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await peer.handleInitialStatus(node, ourStatus, theirStatus)
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proc statusResp(peer: Peer, msg: StatusMsg)
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proc goodbye(peer: Peer, reason: DisconnectionReason) {.libp2pProtocol("goodbye", 1).}
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requestResponse:
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proc beaconBlocksByRange(
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peer: Peer,
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headBlockRoot: Eth2Digest,
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startSlot: Slot,
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count: uint64,
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step: uint64) {.
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libp2pProtocol("beacon_blocks_by_range", 1).} =
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if count > 0'u64:
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let count = if step != 0: min(count, MAX_REQUESTED_BLOCKS.uint64) else: 1
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let pool = peer.networkState.node.blockPool
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var results: array[MAX_REQUESTED_BLOCKS, BlockRef]
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let
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lastPos = min(count.int, results.len) - 1
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firstPos = pool.getBlockRange(headBlockRoot, startSlot, step,
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results.toOpenArray(0, lastPos))
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for i in firstPos.int .. lastPos.int:
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await response.write(pool.get(results[i]).data)
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proc beaconBlocksByRoot(
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peer: Peer,
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blockRoots: openarray[Eth2Digest]) {.
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libp2pProtocol("beacon_blocks_by_root", 1).} =
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let
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pool = peer.networkState.node.blockPool
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db = peer.networkState.db
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for root in blockRoots:
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let blockRef = pool.getRef(root)
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if not isNil(blockRef):
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await response.write(pool.get(blockRef).data)
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proc beaconBlocks(
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peer: Peer,
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blocks: openarray[BeaconBlock])
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proc handleInitialStatus(peer: Peer,
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node: BeaconNode,
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ourStatus: StatusMsg,
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theirStatus: StatusMsg) {.async, gcsafe.} =
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if theirStatus.forkVersion != node.forkVersion:
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await peer.disconnect(IrrelevantNetwork)
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return
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# TODO: onPeerConnected runs unconditionally for every connected peer, but we
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# don't need to sync with everybody. The beacon node should detect a situation
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# where it needs to sync and it should execute the sync algorithm with a certain
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# number of randomly selected peers. The algorithm itself must be extracted in a proc.
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try:
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libp2p_peers.set peer.network.peers.len.int64
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debug "Peer connected. Initiating sync", peer,
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headSlot = ourStatus.headSlot,
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remoteHeadSlot = theirStatus.headSlot
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let bestDiff = cmp((ourStatus.finalizedEpoch, ourStatus.headSlot),
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(theirStatus.finalizedEpoch, theirStatus.headSlot))
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if bestDiff >= 0:
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# Nothing to do?
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debug "Nothing to sync", peer
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else:
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# TODO: Check for WEAK_SUBJECTIVITY_PERIOD difference and terminate the
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# connection if it's too big.
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var s = ourStatus.headSlot + 1
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var theirStatus = theirStatus
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while s <= theirStatus.headSlot:
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let numBlocksToRequest = min(uint64(theirStatus.headSlot - s),
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MAX_REQUESTED_BLOCKS)
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debug "Requesting blocks", peer, remoteHeadSlot = theirStatus.headSlot,
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ourHeadSlot = s,
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numBlocksToRequest
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let blocks = await peer.beaconBlocksByRange(theirStatus.headRoot, s,
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numBlocksToRequest, 1'u64)
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if blocks.isSome:
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info "got blocks", total = blocks.get.len
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if blocks.get.len == 0:
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info "Got 0 blocks while syncing", peer
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break
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node.importBlocks blocks.get
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let lastSlot = blocks.get[^1].slot
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if lastSlot <= s:
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info "Slot did not advance during sync", peer
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break
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s = lastSlot + 1
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# TODO: Maybe this shouldn't happen so often.
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# The alternative could be watching up a timer here.
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let statusResp = await peer.status(node.getCurrentStatus)
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if statusResp.isSome:
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theirStatus = statusResp.get
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else:
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# We'll ignore this error and we'll try to request
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# another range optimistically. If that fails, the
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# syncing will be interrupted.
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discard
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else:
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error "didn't got objectes in time"
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break
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except CatchableError:
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warn "Failed to sync with peer", peer, err = getCurrentExceptionMsg()
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