nimbus-eth2/beacon_chain/eth2_network.nim

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import
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# Std lib
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typetraits, strutils, os, random, algorithm, sequtils,
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options as stdOptions,
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# Status libs
stew/[varints, base58, endians2, results, byteutils],
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stew/shims/net as stewNet,
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stew/shims/[macros, tables],
faststreams/[inputs, outputs, buffers], snappy, snappy/framing,
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json_serialization, json_serialization/std/[net, options],
chronos, chronicles, metrics,
# TODO: create simpler to use libp2p modules that use re-exports
libp2p/[switch, standard_setup, peerinfo, peer, connection, errors,
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multiaddress, multicodec, crypto/crypto, crypto/secp,
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protocols/identify, protocols/protocol],
libp2p/protocols/secure/[secure, secio],
libp2p/protocols/pubsub/[pubsub, floodsub, rpc/messages],
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libp2p/transports/tcptransport,
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libp2p/stream/lpstream,
eth/[keys, async_utils], eth/p2p/p2p_protocol_dsl,
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eth/net/nat, eth/p2p/discoveryv5/[enr, node],
# Beacon node modules
version, conf, eth2_discovery, libp2p_json_serialization, conf,
ssz/ssz_serialization,
peer_pool, spec/[datatypes, network]
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export
version, multiaddress, peer_pool, peerinfo, p2pProtocol,
libp2p_json_serialization, ssz_serialization, peer, results
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logScope:
topics = "networking"
type
KeyPair* = crypto.KeyPair
PublicKey* = crypto.PublicKey
PrivateKey* = crypto.PrivateKey
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Bytes = seq[byte]
ErrorMsg = List[byte, 256]
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# TODO: This is here only to eradicate a compiler
# warning about unused import (rpc/messages).
GossipMsg = messages.Message
SeenItem* = object
pinfo*: PeerInfo
stamp*: chronos.Moment
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# TODO Is this really needed?
Eth2Node* = ref object of RootObj
switch*: Switch
discovery*: Eth2DiscoveryProtocol
wantedPeers*: int
peerPool*: PeerPool[Peer, PeerID]
protocolStates*: seq[RootRef]
libp2pTransportLoops*: seq[Future[void]]
discoveryLoop: Future[void]
metadata*: Eth2Metadata
connectTimeout*: chronos.Duration
seenThreshold*: chronos.Duration
connQueue: AsyncQueue[PeerInfo]
seenTable: Table[PeerID, SeenItem]
connWorkers: seq[Future[void]]
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EthereumNode = Eth2Node # needed for the definitions in p2p_backends_helpers
Eth2MetaData* = object
seq_number*: uint64
attnets*: BitArray[ATTESTATION_SUBNET_COUNT]
ENRForkID* = object
fork_digest*: ForkDigest
next_fork_version*: Version
next_fork_epoch*: Epoch
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Peer* = ref object
network*: Eth2Node
info*: PeerInfo
wasDialed*: bool
discoveryId*: Eth2DiscoveryId
connectionState*: ConnectionState
protocolStates*: seq[RootRef]
maxInactivityAllowed*: Duration
score*: int
lacksSnappy: bool
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ConnectionState* = enum
None,
Connecting,
Connected,
Disconnecting,
Disconnected
UntypedResponse = ref object
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peer*: Peer
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stream*: Connection
noSnappy*: bool
writtenChunks*: int
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SingleChunkResponse*[MsgType] = distinct UntypedResponse
## Protocol requests using this type will produce request-making
## client-side procs that return `NetRes[MsgType]`
MultipleChunksResponse*[MsgType] = distinct UntypedResponse
## Protocol requests using this type will produce request-making
## client-side procs that return `NetRes[seq[MsgType]]`.
## In the future, such procs will return an `InputStream[NetRes[MsgType]]`.
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MessageInfo* = object
name*: string
# Private fields:
libp2pCodecName: string
protocolMounter*: MounterProc
ProtocolInfoObj* = object
name*: string
messages*: seq[MessageInfo]
index*: int # the position of the protocol in the
# ordered list of supported protocols
# Private fields:
peerStateInitializer*: PeerStateInitializer
networkStateInitializer*: NetworkStateInitializer
handshake*: HandshakeStep
disconnectHandler*: DisconnectionHandler
ProtocolInfo* = ptr ProtocolInfoObj
ResponseCode* = enum
Success
InvalidRequest
ServerError
PeerStateInitializer* = proc(peer: Peer): RootRef {.gcsafe.}
NetworkStateInitializer* = proc(network: EthereumNode): RootRef {.gcsafe.}
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HandshakeStep* = proc(peer: Peer, conn: Connection): Future[void] {.gcsafe.}
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DisconnectionHandler* = proc(peer: Peer): Future[void] {.gcsafe.}
ThunkProc* = LPProtoHandler
MounterProc* = proc(network: Eth2Node) {.gcsafe.}
MessageContentPrinter* = proc(msg: pointer): string {.gcsafe.}
DisconnectionReason* = enum
ClientShutDown
IrrelevantNetwork
FaultOrError
PeerDisconnected* = object of CatchableError
reason*: DisconnectionReason
TransmissionError* = object of CatchableError
Eth2NetworkingErrorKind* = enum
BrokenConnection
ReceivedErrorResponse
UnexpectedEOF
PotentiallyExpectedEOF
InvalidResponseCode
InvalidSnappyBytes
InvalidSszBytes
StreamOpenTimeout
ReadResponseTimeout
ZeroSizePrefix
SizePrefixOverflow
Eth2NetworkingError = object
case kind*: Eth2NetworkingErrorKind
of ReceivedErrorResponse:
responseCode: ResponseCode
errorMsg: ErrorMsg
else:
discard
NetRes*[T] = Result[T, Eth2NetworkingError]
## This is type returned from all network requests
const
clientId* = "Nimbus beacon node v" & fullVersionStr
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networkKeyFilename = "privkey.protobuf"
nodeMetadataFilename = "node-metadata.json"
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TCP = net.Protocol.IPPROTO_TCP
HandshakeTimeout = FaultOrError
# Spec constants
# https://github.com/ethereum/eth2.0-specs/blob/dev/specs/networking/p2p-interface.md#eth-20-network-interaction-domains
MAX_CHUNK_SIZE* = 1 * 1024 * 1024 # bytes
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GOSSIP_MAX_SIZE* = 1 * 1024 * 1024 # bytes
TTFB_TIMEOUT* = 5.seconds
RESP_TIMEOUT* = 10.seconds
readTimeoutErrorMsg = "Exceeded read timeout for a request"
NewPeerScore* = 200
## Score which will be assigned to new connected Peer
PeerScoreLowLimit* = 0
## Score after which peer will be kicked
PeerScoreHighLimit* = 1000
## Max value of peer's score
ConcurrentConnections* = 10
## Maximum number of active concurrent connection requests.
template neterr(kindParam: Eth2NetworkingErrorKind): auto =
err(type(result), Eth2NetworkingError(kind: kindParam))
# Metrics for tracking attestation and beacon block loss
declareCounter gossip_messages_sent,
"Number of gossip messages sent by this peer"
declareCounter gossip_messages_received,
"Number of gossip messages received by this peer"
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declarePublicGauge libp2p_successful_dials,
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"Number of successfully dialed peers"
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declarePublicGauge libp2p_failed_dials,
"Number of dialing attempts that failed"
declarePublicGauge libp2p_timeout_dials,
"Number of dialing attempts that exceeded timeout"
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declarePublicGauge libp2p_peers,
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"Number of active libp2p peers"
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proc safeClose(conn: Connection) {.async.} =
if not conn.closed:
await close(conn)
const
snappy_implementation {.strdefine.} = "libp2p"
const useNativeSnappy = when snappy_implementation == "native": true
elif snappy_implementation == "libp2p": false
else: {.fatal: "Please set snappy_implementation to either 'libp2p' or 'native'".}
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template libp2pProtocol*(name: string, version: int) {.pragma.}
template `$`*(peer: Peer): string = id(peer.info)
chronicles.formatIt(Peer): $it
template remote*(peer: Peer): untyped =
peer.info.peerId
proc openStream(node: Eth2Node,
peer: Peer,
protocolId: string): Future[Connection] {.async.} =
let protocolId = protocolId & (if peer.lacksSnappy: "ssz" else: "ssz_snappy")
try:
result = await dial(node.switch, peer.info, protocolId)
except CancelledError:
raise
except CatchableError:
# TODO: LibP2P should raise a more specific exception here
if peer.lacksSnappy == false:
peer.lacksSnappy = true
trace "Snappy connection failed. Trying without Snappy",
peer, protocolId
return await openStream(node, peer, protocolId)
else:
raise
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func peerId(conn: Connection): PeerID =
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# TODO: Can this be `nil`?
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conn.peerInfo.peerId
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proc init*(T: type Peer, network: Eth2Node, info: PeerInfo): Peer {.gcsafe.}
proc getPeer*(node: Eth2Node, peerInfo: PeerInfo): Peer {.gcsafe.} =
let peerId = peerInfo.peerId
result = node.peerPool.getOrDefault(peerId)
if result == nil:
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# TODO: We should register this peer in the pool!
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result = Peer.init(node, peerInfo)
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proc peerFromStream(network: Eth2Node, conn: Connection): Peer {.gcsafe.} =
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# TODO: Can this be `nil`?
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return network.getPeer(conn.peerInfo)
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proc getKey*(peer: Peer): PeerID {.inline.} =
result = peer.info.peerId
proc getFuture*(peer: Peer): Future[void] {.inline.} =
result = peer.info.lifeFuture()
proc `<`*(a, b: Peer): bool =
result = `<`(a.score, b.score)
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proc getScore*(a: Peer): int =
result = a.score
proc updateScore*(peer: Peer, score: int) {.inline.} =
## Update peer's ``peer`` score with value ``score``.
peer.score = peer.score + score
if peer.score > PeerScoreHighLimit:
peer.score = PeerScoreHighLimit
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proc disconnect*(peer: Peer, reason: DisconnectionReason,
notifyOtherPeer = false) {.async.} =
# TODO: How should we notify the other peer?
if peer.connectionState notin {Disconnecting, Disconnected}:
peer.connectionState = Disconnecting
await peer.network.switch.disconnect(peer.info)
peer.connectionState = Disconnected
peer.network.peerPool.release(peer)
peer.info.close()
include eth/p2p/p2p_backends_helpers
include eth/p2p/p2p_tracing
proc getRequestProtoName(fn: NimNode): NimNode =
# `getCustomPragmaVal` doesn't work yet on regular nnkProcDef nodes
# (TODO: file as an issue)
let pragmas = fn.pragma
if pragmas.kind == nnkPragma and pragmas.len > 0:
for pragma in pragmas:
if pragma.len > 0 and $pragma[0] == "libp2pProtocol":
let protoName = $(pragma[1])
let protoVer = $(pragma[2].intVal)
return newLit("/eth2/beacon_chain/req/" & protoName & "/" & protoVer & "/")
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return newLit("")
template raisePeerDisconnected(msg: string, r: DisconnectionReason) =
var e = newException(PeerDisconnected, msg)
e.reason = r
raise e
proc disconnectAndRaise(peer: Peer,
reason: DisconnectionReason,
msg: string) {.async.} =
let r = reason
await peer.disconnect(r)
raisePeerDisconnected(msg, r)
proc writeChunk*(conn: Connection,
responseCode: Option[ResponseCode],
payload: Bytes,
noSnappy: bool) {.async.} =
var output = memoryOutput()
if responseCode.isSome:
output.write byte(responseCode.get)
output.write varintBytes(payload.len.uint64)
if noSnappy:
output.write(payload)
else:
output.write(framingFormatCompress payload)
await conn.write(output.getOutput)
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template errorMsgLit(x: static string): ErrorMsg =
const val = ErrorMsg toBytes(x)
val
proc formatErrorMsg(msg: ErrorMSg): string =
let candidate = string.fromBytes(asSeq(msg))
for c in candidate:
# TODO UTF-8 - but let's start with ASCII
if ord(c) < 32 or ord(c) > 127:
return byteutils.toHex(asSeq(msg))
return candidate
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proc sendErrorResponse(peer: Peer,
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conn: Connection,
noSnappy: bool,
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responseCode: ResponseCode,
errMsg: ErrorMsg) {.async.} =
debug "Error processing request",
peer, responseCode, errMsg = formatErrorMsg(errMsg)
await conn.writeChunk(some responseCode, SSZ.encode(errMsg), noSnappy)
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proc sendNotificationMsg(peer: Peer, protocolId: string, requestBytes: Bytes) {.async} =
var
deadline = sleepAsync RESP_TIMEOUT
streamFut = peer.network.openStream(peer, protocolId)
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await streamFut or deadline
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if not streamFut.finished:
streamFut.cancel()
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raise newException(TransmissionError, "Failed to open LibP2P stream")
let stream = streamFut.read
try:
await stream.writeChunk(none ResponseCode, requestBytes, peer.lacksSnappy)
finally:
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await safeClose(stream)
proc sendResponseChunkBytes(response: UntypedResponse, payload: Bytes) {.async.} =
inc response.writtenChunks
await response.stream.writeChunk(some Success, payload, response.noSnappy)
proc sendResponseChunkObj(response: UntypedResponse, val: auto) {.async.} =
inc response.writtenChunks
await response.stream.writeChunk(some Success, SSZ.encode(val), response.noSnappy)
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template sendUserHandlerResultAsChunkImpl*(stream: Connection,
noSnappy: bool,
handlerResultFut: Future): untyped =
let handlerRes = await handlerResultFut
writeChunk(stream, some Success, SSZ.encode(handlerRes), noSnappy)
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template sendUserHandlerResultAsChunkImpl*(stream: Connection,
noSnappy: bool,
handlerResult: auto): untyped =
writeChunk(stream, some Success, SSZ.encode(handlerResult), noSnappy)
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when useNativeSnappy:
include faststreams_backend
else:
include libp2p_streams_backend
template awaitWithTimeout[T](operation: Future[T],
deadline: Future[void],
onTimeout: untyped): T =
let f = operation
await f or deadline
if not f.finished:
cancel f
onTimeout
else:
f.read
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proc makeEth2Request(peer: Peer, protocolId: string, requestBytes: Bytes,
ResponseMsg: type,
timeout: Duration): Future[NetRes[ResponseMsg]]
{.gcsafe, async.} =
var deadline = sleepAsync timeout
let stream = awaitWithTimeout(peer.network.openStream(peer, protocolId),
deadline): return neterr StreamOpenTimeout
try:
# Send the request
await stream.writeChunk(none ResponseCode, requestBytes, peer.lacksSnappy)
# Read the response
return awaitWithTimeout(
readResponse(when useNativeSnappy: libp2pInput(stream)
else: stream,
peer.lacksSnappy,
ResponseMsg),
deadline, neterr(ReadResponseTimeout))
finally:
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await safeClose(stream)
proc init*[MsgType](T: type MultipleChunksResponse[MsgType],
peer: Peer, conn: Connection, noSnappy: bool): T =
T(UntypedResponse(peer: peer, stream: conn, noSnappy: noSnappy))
proc init*[MsgType](T: type SingleChunkResponse[MsgType],
peer: Peer, conn: Connection, noSnappy: bool): T =
T(UntypedResponse(peer: peer, stream: conn, noSnappy: noSnappy))
template write*[M](r: MultipleChunksResponse[M], val: M): untyped =
sendResponseChunkObj(UntypedResponse(r), val)
template send*[M](r: SingleChunkResponse[M], val: auto): untyped =
doAssert UntypedResponse(r).writtenChunks == 0
sendResponseChunkObj(UntypedResponse(r), val)
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proc performProtocolHandshakes*(peer: Peer) {.async.} =
var subProtocolsHandshakes = newSeqOfCap[Future[void]](allProtocols.len)
for protocol in allProtocols:
if protocol.handshake != nil:
subProtocolsHandshakes.add((protocol.handshake)(peer, nil))
await allFuturesThrowing(subProtocolsHandshakes)
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template initializeConnection*(peer: Peer): auto =
performProtocolHandshakes(peer)
proc initProtocol(name: string,
peerInit: PeerStateInitializer,
networkInit: NetworkStateInitializer): ProtocolInfoObj =
result.name = name
result.messages = @[]
result.peerStateInitializer = peerInit
result.networkStateInitializer = networkInit
proc registerProtocol(protocol: ProtocolInfo) =
# TODO: This can be done at compile-time in the future
let pos = lowerBound(gProtocols, protocol)
gProtocols.insert(protocol, pos)
for i in 0 ..< gProtocols.len:
gProtocols[i].index = i
proc setEventHandlers(p: ProtocolInfo,
handshake: HandshakeStep,
disconnectHandler: DisconnectionHandler) =
p.handshake = handshake
p.disconnectHandler = disconnectHandler
proc implementSendProcBody(sendProc: SendProc) =
let
msg = sendProc.msg
UntypedResponse = bindSym "UntypedResponse"
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proc sendCallGenerator(peer, bytes: NimNode): NimNode =
if msg.kind != msgResponse:
let msgProto = getRequestProtoName(msg.procDef)
case msg.kind
of msgRequest:
let ResponseRecord = msg.response.recName
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quote:
makeEth2Request(`peer`, `msgProto`, `bytes`,
`ResponseRecord`, `timeoutVar`)
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else:
quote: sendNotificationMsg(`peer`, `msgProto`, `bytes`)
else:
quote: sendResponseChunkBytes(`UntypedResponse`(`peer`), `bytes`)
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sendProc.useStandardBody(nil, nil, sendCallGenerator)
proc handleIncomingStream(network: Eth2Node,
conn: Connection,
noSnappy: bool,
MsgType: type) {.async, gcsafe.} =
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mixin callUserHandler, RecType
type MsgRec = RecType(MsgType)
const msgName {.used.} = typetraits.name(MsgType)
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## Uncomment this to enable tracing on all incoming requests
## You can include `msgNameLit` in the condition to select
## more specific requests:
# when chronicles.runtimeFilteringEnabled:
# setLogLevel(LogLevel.TRACE)
# defer: setLogLevel(LogLevel.DEBUG)
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# trace "incoming " & `msgNameLit` & " conn"
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try:
let peer = peerFromStream(network, conn)
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template returnInvalidRequest(msg: ErrorMsg) =
await sendErrorResponse(peer, conn, noSnappy, InvalidRequest, msg)
return
template returnInvalidRequest(msg: string) =
returnInvalidRequest(ErrorMsg msg.toBytes)
let s = when useNativeSnappy:
let fs = libp2pInput(conn)
if fs.timeoutToNextByte(TTFB_TIMEOUT):
returnInvalidRequest(errorMsgLit "Request first byte not sent in time")
fs
else:
# TODO The TTFB timeout is not implemented in LibP2P streams back-end
conn
let deadline = sleepAsync RESP_TIMEOUT
let msg = if sizeof(MsgRec) > 0:
try:
awaitWithTimeout(readChunkPayload(s, noSnappy, MsgRec), deadline):
returnInvalidRequest(errorMsgLit "Request full data not sent in time")
except SerializationError as err:
returnInvalidRequest err.formatMsg("msg")
except SnappyError as err:
returnInvalidRequest err.msg
else:
NetRes[MsgRec].ok default(MsgRec)
if msg.isErr:
let (responseCode, errMsg) = case msg.error.kind
of UnexpectedEOF, PotentiallyExpectedEOF:
(InvalidRequest, errorMsgLit "Incomplete request")
of InvalidSnappyBytes:
(InvalidRequest, errorMsgLit "Failed to decompress snappy payload")
of InvalidSszBytes:
(InvalidRequest, errorMsgLit "Failed to decode SSZ payload")
of ZeroSizePrefix:
(InvalidRequest, errorMsgLit "The request chunk cannot have a size of zero")
of SizePrefixOverflow:
(InvalidRequest, errorMsgLit "The chunk size exceed the maximum allowed")
of InvalidResponseCode, ReceivedErrorResponse,
StreamOpenTimeout, ReadResponseTimeout:
# These shouldn't be possible in a request, because
# there are no response codes being read, no stream
# openings and no reading of responses:
(ServerError, errorMsgLit "Internal server error")
of BrokenConnection:
return
await sendErrorResponse(peer, conn, noSnappy, responseCode, errMsg)
return
try:
logReceivedMsg(peer, MsgType(msg.get))
await callUserHandler(MsgType, peer, conn, noSnappy, msg.get)
except CatchableError as err:
await sendErrorResponse(peer, conn, noSnappy, ServerError,
ErrorMsg err.msg.toBytes)
except CatchableError as err:
debug "Error processing an incoming request", err = err.msg, msgName
finally:
await safeClose(conn)
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proc handleOutgoingPeer*(peer: Peer): Future[bool] {.async.} =
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let network = peer.network
proc onPeerClosed(udata: pointer) {.gcsafe.} =
debug "Peer (outgoing) lost", peer = $peer.info
libp2p_peers.set int64(len(network.peerPool))
let res = await network.peerPool.addOutgoingPeer(peer)
if res:
peer.updateScore(NewPeerScore)
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debug "Peer (outgoing) has been added to PeerPool", peer = $peer.info
peer.getFuture().addCallback(onPeerClosed)
result = true
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libp2p_peers.set int64(len(network.peerPool))
proc handleIncomingPeer*(peer: Peer): Future[bool] {.async.} =
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let network = peer.network
proc onPeerClosed(udata: pointer) {.gcsafe.} =
debug "Peer (incoming) lost", peer = $peer.info
libp2p_peers.set int64(len(network.peerPool))
let res = await network.peerPool.addIncomingPeer(peer)
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if res:
peer.updateScore(NewPeerScore)
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debug "Peer (incoming) has been added to PeerPool", peer = $peer.info
peer.getFuture().addCallback(onPeerClosed)
result = true
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libp2p_peers.set int64(len(network.peerPool))
proc toPeerInfo*(r: enr.TypedRecord): PeerInfo =
if r.secp256k1.isSome:
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var pubKey = keys.PublicKey.fromRaw(r.secp256k1.get)
if pubkey.isErr:
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return # TODO
let peerId = PeerID.init crypto.PublicKey(
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scheme: Secp256k1, skkey: secp.SkPublicKey(pubKey[]))
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var addresses = newSeq[MultiAddress]()
if r.ip.isSome and r.tcp.isSome:
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let ip = ipv4(r.ip.get)
addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp.get)
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if r.ip6.isSome:
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let ip = ipv6(r.ip6.get)
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if r.tcp6.isSome:
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addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp6.get)
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elif r.tcp.isSome:
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addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp.get)
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else:
discard
if addresses.len > 0:
return PeerInfo.init(peerId, addresses)
proc toPeerInfo(r: Option[enr.TypedRecord]): PeerInfo =
if r.isSome:
return r.get.toPeerInfo
proc isSeen*(network: ETh2Node, pinfo: PeerInfo): bool =
let currentTime = now(chronos.Moment)
let item = network.seenTable.getOrDefault(pinfo.peerId)
if isNil(item.pinfo):
# Peer is not in SeenTable.
return false
if currentTime - item.stamp >= network.seenThreshold:
network.seenTable.del(pinfo.peerId)
return false
return true
proc addSeen*(network: ETh2Node, pinfo: PeerInfo) =
let item = SeenItem(pinfo: pinfo, stamp: now(chronos.Moment))
network.seenTable[pinfo.peerId] = item
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proc dialPeer*(node: Eth2Node, peerInfo: PeerInfo) {.async.} =
logScope: peer = $peerInfo
debug "Connecting to peer"
await node.switch.connect(peerInfo)
var peer = node.getPeer(peerInfo)
peer.wasDialed = true
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#let msDial = newMultistream()
#let conn = node.switch.connections.getOrDefault(peerInfo.id)
#let ls = await msDial.list(conn)
#debug "Supported protocols", ls
debug "Initializing connection"
await initializeConnection(peer)
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inc libp2p_successful_dials
debug "Network handshakes completed"
proc connectWorker(network: Eth2Node) {.async.} =
debug "Connection worker started"
while true:
let pi = await network.connQueue.popFirst()
let r1 = network.peerPool.hasPeer(pi.peerId)
let r2 = network.isSeen(pi)
if not(r1) and not(r2):
# We trying to connect to peers which are not present in our PeerPool and
# not present in our SeenTable.
var fut = network.dialPeer(pi)
# We discarding here just because we going to check future state, to avoid
# condition where connection happens and timeout reached.
let res = await withTimeout(fut, network.connectTimeout)
# We handling only timeout and errors, because successfull connections
# will be stored in PeerPool.
if fut.finished():
if fut.failed() and not(fut.cancelled()):
debug "Unable to establish connection with peer", peer = $pi,
errMsg = fut.readError().msg
inc libp2p_failed_dials
network.addSeen(pi)
continue
debug "Connection to remote peer timed out", peer = $pi
inc libp2p_timeout_dials
network.addSeen(pi)
else:
debug "Peer is already connected or already seen", peer = $pi,
peer_pool_has_peer = $r1, seen_table_has_peer = $r2,
seen_table_size = len(network.seenTable)
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proc runDiscoveryLoop*(node: Eth2Node) {.async.} =
debug "Starting discovery loop"
while true:
let currentPeerCount = node.peerPool.len
if currentPeerCount < node.wantedPeers:
try:
let discoveredPeers =
node.discovery.randomNodes(node.wantedPeers - currentPeerCount)
for peer in discoveredPeers:
try:
let peerRecord = peer.record.toTypedRecord
if peerRecord.isOk:
let peerInfo = peerRecord.value.toPeerInfo
if peerInfo != nil:
if peerInfo.id notin node.switch.connections:
debug "Discovered new peer", peer = $peer
await node.connQueue.addLast(peerInfo)
else:
peerInfo.close()
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except CatchableError as err:
debug "Failed to connect to peer", peer = $peer, err = err.msg
except CatchableError as err:
debug "Failure in discovery", err = err.msg
await sleepAsync seconds(1)
proc getPersistentNetMetadata*(conf: BeaconNodeConf): Eth2Metadata =
let metadataPath = conf.dataDir / nodeMetadataFilename
if not fileExists(metadataPath):
result = Eth2Metadata()
for i in 0 ..< ATTESTATION_SUBNET_COUNT:
# TODO: For now, we indicate that we participate in all subnets
result.attnets[i] = true
Json.saveFile(metadataPath, result)
else:
result = Json.loadFile(metadataPath, Eth2Metadata)
proc init*(T: type Eth2Node, conf: BeaconNodeConf, enrForkId: ENRForkID,
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switch: Switch, ip: Option[ValidIpAddress], tcpPort, udpPort: Port,
privKey: keys.PrivateKey): T =
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new result
result.switch = switch
result.wantedPeers = conf.maxPeers
result.peerPool = newPeerPool[Peer, PeerID](maxPeers = conf.maxPeers)
result.connectTimeout = 10.seconds
result.seenThreshold = 10.minutes
result.seenTable = initTable[PeerID, SeenItem]()
result.connQueue = newAsyncQueue[PeerInfo](ConcurrentConnections)
result.metadata = getPersistentNetMetadata(conf)
result.discovery = Eth2DiscoveryProtocol.new(
conf, ip, tcpPort, udpPort, privKey.toRaw,
{"eth2": SSZ.encode(enrForkId), "attnets": SSZ.encode(result.metadata.attnets)})
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newSeq result.protocolStates, allProtocols.len
for proto in allProtocols:
if proto.networkStateInitializer != nil:
result.protocolStates[proto.index] = proto.networkStateInitializer(result)
for msg in proto.messages:
if msg.protocolMounter != nil:
msg.protocolMounter result
for i in 0 ..< ConcurrentConnections:
result.connWorkers.add(connectWorker(result))
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template publicKey*(node: Eth2Node): keys.PublicKey =
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node.discovery.privKey.toPublicKey.tryGet()
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template addKnownPeer*(node: Eth2Node, peer: enr.Record) =
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node.discovery.addNode peer
proc start*(node: Eth2Node) {.async.} =
node.discovery.open()
node.discovery.start()
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node.libp2pTransportLoops = await node.switch.start()
node.discoveryLoop = node.runDiscoveryLoop()
traceAsyncErrors node.discoveryLoop
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proc stop*(node: Eth2Node) {.async.} =
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# Ignore errors in futures, since we're shutting down (but log them on the
# TRACE level, if a timeout is reached).
let
waitedFutures = @[
node.discovery.closeWait(),
node.switch.stop(),
]
timeout = 5.seconds
completed = await withTimeout(allFutures(waitedFutures), timeout)
if not completed:
trace "Eth2Node.stop(): timeout reached", timeout, futureErrors = waitedFutures.filterIt(it.error != nil).mapIt(it.error.msg)
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proc init*(T: type Peer, network: Eth2Node, info: PeerInfo): Peer =
new result
result.info = info
result.network = network
result.connectionState = Connected
result.maxInactivityAllowed = 15.minutes # TODO: Read this from the config
newSeq result.protocolStates, allProtocols.len
for i in 0 ..< allProtocols.len:
let proto = allProtocols[i]
if proto.peerStateInitializer != nil:
result.protocolStates[i] = proto.peerStateInitializer(result)
proc registerMsg(protocol: ProtocolInfo,
name: string,
mounter: MounterProc,
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libp2pCodecName: string) =
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protocol.messages.add MessageInfo(name: name,
protocolMounter: mounter,
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libp2pCodecName: libp2pCodecName)
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proc p2pProtocolBackendImpl*(p: P2PProtocol): Backend =
var
Format = ident "SSZ"
Bool = bindSym "bool"
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Connection = bindSym "Connection"
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Peer = bindSym "Peer"
Eth2Node = bindSym "Eth2Node"
registerMsg = bindSym "registerMsg"
initProtocol = bindSym "initProtocol"
msgVar = ident "msg"
networkVar = ident "network"
callUserHandler = ident "callUserHandler"
noSnappyVar = ident "noSnappy"
MSG = ident "MSG"
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p.useRequestIds = false
p.useSingleRecordInlining = true
new result
result.PeerType = Peer
result.NetworkType = Eth2Node
result.registerProtocol = bindSym "registerProtocol"
result.setEventHandlers = bindSym "setEventHandlers"
result.SerializationFormat = Format
result.RequestResultsWrapper = ident "NetRes"
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result.afterProtocolInit = proc (p: P2PProtocol) =
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p.onPeerConnected.params.add newIdentDefs(streamVar, Connection)
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result.implementMsg = proc (msg: p2p_protocol_dsl.Message) =
if msg.kind == msgResponse:
return
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let
protocol = msg.protocol
msgName = $msg.ident
msgNameLit = newLit msgName
MsgRecName = msg.recName
MsgStrongRecName = msg.strongRecName
codecNameLit = getRequestProtoName(msg.procDef)
protocolMounterName = ident(msgName & "Mounter")
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##
## Implement the Thunk:
##
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## The protocol handlers in nim-libp2p receive only a `Connection`
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## parameter and there is no way to access the wider context (such
## as the current `Switch`). In our handlers, we may need to list all
## peers in the current network, so we must keep a reference to the
## network object in the closure environment of the installed handlers.
##
## For this reason, we define a `protocol mounter` proc that will
## initialize the network object by creating handlers bound to the
## specific network.
##
var userHandlerCall = newTree(nnkDiscardStmt)
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if msg.userHandler != nil:
var OutputParamType = if msg.kind == msgRequest: msg.outputParamType
else: nil
if OutputParamType == nil:
userHandlerCall = msg.genUserHandlerCall(msgVar, [peerVar])
if msg.kind == msgRequest:
userHandlerCall = newCall(ident"sendUserHandlerResultAsChunkImpl",
streamVar,
noSnappyVar,
userHandlerCall)
else:
if OutputParamType.kind == nnkVarTy:
OutputParamType = OutputParamType[0]
let isChunkStream = eqIdent(OutputParamType[0], "MultipleChunksResponse")
msg.response.recName = if isChunkStream:
newTree(nnkBracketExpr, ident"seq", OutputParamType[1])
else:
OutputParamType[1]
let responseVar = ident("response")
userHandlerCall = newStmtList(
newVarStmt(responseVar,
newCall(ident"init", OutputParamType,
peerVar, streamVar, noSnappyVar)),
msg.genUserHandlerCall(msgVar, [peerVar], outputParam = responseVar))
protocol.outRecvProcs.add quote do:
template `callUserHandler`(`MSG`: type `MsgStrongRecName`,
`peerVar`: `Peer`,
`streamVar`: `Connection`,
`noSnappyVar`: bool,
`msgVar`: `MsgRecName`): untyped =
`userHandlerCall`
proc `protocolMounterName`(`networkVar`: `Eth2Node`) =
proc sszThunk(`streamVar`: `Connection`,
`protocolVar`: string): Future[void] {.gcsafe.} =
return handleIncomingStream(`networkVar`, `streamVar`, true,
`MsgStrongRecName`)
mount `networkVar`.switch,
LPProtocol(codec: `codecNameLit` & "ssz",
handler: sszThunk)
proc snappyThunk(`streamVar`: `Connection`,
`protocolVar`: string): Future[void] {.gcsafe.} =
return handleIncomingStream(`networkVar`, `streamVar`, false,
`MsgStrongRecName`)
mount `networkVar`.switch,
LPProtocol(codec: `codecNameLit` & "ssz_snappy",
handler: snappyThunk)
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##
## Implement Senders and Handshake
##
if msg.kind == msgHandshake:
macros.error "Handshake messages are not supported in LibP2P protocols"
else:
var sendProc = msg.createSendProc()
implementSendProcBody sendProc
protocol.outProcRegistrations.add(
newCall(registerMsg,
protocol.protocolInfoVar,
msgNameLit,
protocolMounterName,
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codecNameLit))
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result.implementProtocolInit = proc (p: P2PProtocol): NimNode =
return newCall(initProtocol, newLit(p.name), p.peerInit, p.netInit)
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proc setupNat(conf: BeaconNodeConf): tuple[ip: Option[ValidIpAddress],
tcpPort: Port,
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udpPort: Port] {.gcsafe.} =
# defaults
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result.tcpPort = conf.tcpPort
result.udpPort = conf.udpPort
var nat: NatStrategy
case conf.nat.toLowerAscii:
of "any":
nat = NatAny
of "none":
nat = NatNone
of "upnp":
nat = NatUpnp
of "pmp":
nat = NatPmp
else:
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if conf.nat.startsWith("extip:"):
try:
# any required port redirection is assumed to be done by hand
result.ip = some(ValidIpAddress.init(conf.nat[6..^1]))
nat = NatNone
except ValueError:
error "nor a valid IP address", address = conf.nat[6..^1]
quit QuitFailure
else:
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error "not a valid NAT mechanism", value = conf.nat
quit QuitFailure
if nat != NatNone:
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let extIp = getExternalIP(nat)
if extIP.isSome:
result.ip = some(ValidIpAddress.init extIp.get)
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# TODO redirectPorts in considered a gcsafety violation
# because it obtains the address of a non-gcsafe proc?
let extPorts = ({.gcsafe.}:
redirectPorts(tcpPort = result.tcpPort,
udpPort = result.udpPort,
description = clientId))
if extPorts.isSome:
(result.tcpPort, result.udpPort) = extPorts.get()
func asLibp2pKey*(key: keys.PublicKey): PublicKey =
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PublicKey(scheme: Secp256k1, skkey: secp.SkPublicKey(key))
func asEthKey*(key: PrivateKey): keys.PrivateKey =
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keys.PrivateKey(key.skkey)
proc initAddress*(T: type MultiAddress, str: string): T =
let address = MultiAddress.init(str)
if IPFS.match(address) and matchPartial(multiaddress.TCP, address):
result = address
else:
raise newException(MultiAddressError,
"Invalid bootstrap node multi-address")
template tcpEndPoint(address, port): auto =
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MultiAddress.init(address, tcpProtocol, port)
proc getPersistentNetKeys*(conf: BeaconNodeConf): KeyPair =
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let
privKeyPath = conf.dataDir / networkKeyFilename
privKey =
if not fileExists(privKeyPath):
createDir conf.dataDir.string
let key = PrivateKey.random(Secp256k1).tryGet()
writeFile(privKeyPath, key.getBytes().tryGet())
key
else:
let keyBytes = readFile(privKeyPath)
PrivateKey.init(keyBytes.toOpenArrayByte(0, keyBytes.high)).tryGet()
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KeyPair(seckey: privKey, pubkey: privKey.getKey().tryGet())
proc createEth2Node*(conf: BeaconNodeConf, enrForkId: ENRForkID): Future[Eth2Node] {.async, gcsafe.} =
var
(extIp, extTcpPort, extUdpPort) = setupNat(conf)
hostAddress = tcpEndPoint(conf.libp2pAddress, conf.tcpPort)
announcedAddresses = if extIp.isNone(): @[]
else: @[tcpEndPoint(extIp.get(), extTcpPort)]
info "Initializing networking", hostAddress,
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announcedAddresses
let keys = conf.getPersistentNetKeys
# TODO nim-libp2p still doesn't have support for announcing addresses
# that are different from the host address (this is relevant when we
# are running behind a NAT).
var switch = newStandardSwitch(some keys.seckey, hostAddress,
triggerSelf = true, gossip = true,
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sign = false, verifySignature = false,
transportFlags = {ServerFlags.ReuseAddr})
result = Eth2Node.init(conf, enrForkId, switch,
extIp, extTcpPort, extUdpPort,
keys.seckey.asEthKey)
proc getPersistenBootstrapAddr*(conf: BeaconNodeConf,
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ip: ValidIpAddress, port: Port): EnrResult[enr.Record] =
let pair = getPersistentNetKeys(conf)
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return enr.Record.init(1'u64, # sequence number
pair.seckey.asEthKey,
some(ip), port, port, @[])
proc announcedENR*(node: Eth2Node): enr.Record =
doAssert node.discovery != nil, "The Eth2Node must be initialized"
node.discovery.localNode.record
proc shortForm*(id: KeyPair): string =
$PeerID.init(id.pubkey)
proc connectToNetwork*(node: Eth2Node) {.async.} =
await node.start()
proc checkIfConnectedToBootstrapNode {.async.} =
await sleepAsync(30.seconds)
if node.discovery.bootstrapRecords.len > 0 and libp2p_successful_dials.value == 0:
fatal "Failed to connect to any bootstrap node. Quitting",
bootstrapEnrs = node.discovery.bootstrapRecords
quit 1
# TODO: The initial sync forces this to time out.
# Revisit when the new Sync manager is integrated.
# traceAsyncErrors checkIfConnectedToBootstrapNode()
func peersCount*(node: Eth2Node): int =
len(node.peerPool)
proc subscribe*[MsgType](node: Eth2Node,
topic: string,
msgHandler: proc(msg: MsgType) {.gcsafe.},
msgValidator: proc(msg: MsgType): bool {.gcsafe.} ) {.async, gcsafe.} =
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template execMsgHandler(peerExpr, gossipBytes, gossipTopic, useSnappy) =
inc gossip_messages_received
trace "Incoming pubsub message received",
peer = peerExpr, len = gossipBytes.len, topic = gossipTopic,
message_id = `$`(sha256.digest(gossipBytes))
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when useSnappy:
msgHandler SSZ.decode(snappy.decode(gossipBytes), MsgType)
else:
msgHandler SSZ.decode(gossipBytes, MsgType)
# All message types which are subscribed to should be validated; putting
# this in subscribe(...) ensures that the default approach is correct.
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template execMsgValidator(gossipBytes, gossipTopic, useSnappy): bool =
trace "Incoming pubsub message received for validation",
len = gossipBytes.len, topic = gossipTopic,
message_id = `$`(sha256.digest(gossipBytes))
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when useSnappy:
msgValidator SSZ.decode(snappy.decode(gossipBytes), MsgType)
else:
msgValidator SSZ.decode(gossipBytes, MsgType)
# Validate messages as soon as subscribed
let incomingMsgValidator = proc(topic: string,
message: GossipMsg): Future[bool]
{.async, gcsafe.} =
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return execMsgValidator(message.data, topic, false)
let incomingMsgValidatorSnappy = proc(topic: string,
message: GossipMsg): Future[bool]
{.async, gcsafe.} =
return execMsgValidator(message.data, topic, true)
node.switch.addValidator(topic, incomingMsgValidator)
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node.switch.addValidator(topic & "_snappy", incomingMsgValidatorSnappy)
let incomingMsgHandler = proc(topic: string,
data: seq[byte]) {.async, gcsafe.} =
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execMsgHandler "unknown", data, topic, false
let incomingMsgHandlerSnappy = proc(topic: string,
data: seq[byte]) {.async, gcsafe.} =
execMsgHandler "unknown", data, topic, true
var switchSubscriptions: seq[Future[void]] = @[]
switchSubscriptions.add(node.switch.subscribe(topic, incomingMsgHandler))
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switchSubscriptions.add(node.switch.subscribe(topic & "_snappy", incomingMsgHandlerSnappy))
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await allFutures(switchSubscriptions)
proc traceMessage(fut: FutureBase, digest: MDigest[256]) =
fut.addCallback do (arg: pointer):
if not(fut.failed):
trace "Outgoing pubsub message sent", message_id = `$`(digest)
proc broadcast*(node: Eth2Node, topic: string, msg: auto) =
inc gossip_messages_sent
let broadcastBytes = SSZ.encode(msg)
var fut = node.switch.publish(topic, broadcastBytes)
traceMessage(fut, sha256.digest(broadcastBytes))
traceAsyncErrors(fut)
# also publish to the snappy-compressed topics
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let snappyEncoded = snappy.encode(broadcastBytes)
var futSnappy = node.switch.publish(topic & "_snappy", snappyEncoded)
traceMessage(futSnappy, sha256.digest(snappyEncoded))
traceAsyncErrors(futSnappy)
# TODO:
# At the moment, this is just a compatiblity shim for the existing RLPx functionality.
# The filtering is not implemented properly yet.
iterator randomPeers*(node: Eth2Node, maxPeers: int, Protocol: type): Peer =
var peers = newSeq[Peer]()
for _, peer in pairs(node.peers): peers.add peer
shuffle peers
if peers.len > maxPeers: peers.setLen(maxPeers)
for p in peers: yield p