1210 lines
42 KiB
Nim
1210 lines
42 KiB
Nim
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
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stew/[varints, base58, endians2, results, byteutils],
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stew/shims/net as stewNet,
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stew/shims/[macros, tables],
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faststreams/[inputs, outputs, buffers], snappy, snappy/framing,
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json_serialization, json_serialization/std/[net, options],
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chronos, chronicles, metrics,
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# TODO: create simpler to use libp2p modules that use re-exports
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libp2p/[switch, standard_setup, peerinfo, peer, errors,
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multiaddress, multicodec, crypto/crypto, crypto/secp,
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protocols/identify, protocols/protocol],
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libp2p/protocols/secure/[secure, secio],
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libp2p/protocols/pubsub/[pubsub, floodsub, rpc/messages],
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libp2p/transports/tcptransport,
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libp2p/stream/lpstream,
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eth/[keys, async_utils], eth/p2p/p2p_protocol_dsl,
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eth/net/nat, eth/p2p/discoveryv5/[enr, node],
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# Beacon node modules
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version, conf, eth2_discovery, libp2p_json_serialization, conf,
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ssz/ssz_serialization,
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peer_pool, spec/[datatypes, network]
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export
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version, multiaddress, peer_pool, peerinfo, p2pProtocol,
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libp2p_json_serialization, ssz_serialization, peer, results
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logScope:
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topics = "networking"
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type
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KeyPair* = crypto.KeyPair
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PublicKey* = crypto.PublicKey
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PrivateKey* = crypto.PrivateKey
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Bytes = seq[byte]
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ErrorMsg = List[byte, 256]
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# TODO: This is here only to eradicate a compiler
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# warning about unused import (rpc/messages).
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GossipMsg = messages.Message
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SeenItem* = object
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pinfo*: PeerInfo
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stamp*: chronos.Moment
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# TODO Is this really needed?
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Eth2Node* = ref object of RootObj
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switch*: Switch
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discovery*: Eth2DiscoveryProtocol
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wantedPeers*: int
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peerPool*: PeerPool[Peer, PeerID]
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protocolStates*: seq[RootRef]
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libp2pTransportLoops*: seq[Future[void]]
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discoveryLoop: Future[void]
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metadata*: Eth2Metadata
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connectTimeout*: chronos.Duration
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seenThreshold*: chronos.Duration
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connQueue: AsyncQueue[PeerInfo]
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seenTable: Table[PeerID, SeenItem]
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connWorkers: seq[Future[void]]
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connTable: Table[PeerID, PeerInfo]
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forkId: ENRForkID
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EthereumNode = Eth2Node # needed for the definitions in p2p_backends_helpers
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Eth2MetaData* = object
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seq_number*: uint64
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attnets*: BitArray[ATTESTATION_SUBNET_COUNT]
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ENRForkID* = object
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fork_digest*: ForkDigest
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next_fork_version*: Version
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next_fork_epoch*: Epoch
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Peer* = ref object
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network*: Eth2Node
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info*: PeerInfo
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wasDialed*: bool
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discoveryId*: Eth2DiscoveryId
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connectionState*: ConnectionState
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protocolStates*: seq[RootRef]
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maxInactivityAllowed*: Duration
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score*: int
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lacksSnappy: bool
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ConnectionState* = enum
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None,
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Connecting,
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Connected,
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Disconnecting,
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Disconnected
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UntypedResponse = ref object
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peer*: Peer
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stream*: Connection
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noSnappy*: bool
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writtenChunks*: int
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SingleChunkResponse*[MsgType] = distinct UntypedResponse
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## Protocol requests using this type will produce request-making
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## client-side procs that return `NetRes[MsgType]`
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MultipleChunksResponse*[MsgType] = distinct UntypedResponse
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## Protocol requests using this type will produce request-making
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## client-side procs that return `NetRes[seq[MsgType]]`.
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## In the future, such procs will return an `InputStream[NetRes[MsgType]]`.
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MessageInfo* = object
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name*: string
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# Private fields:
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libp2pCodecName: string
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protocolMounter*: MounterProc
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ProtocolInfoObj* = object
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name*: string
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messages*: seq[MessageInfo]
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index*: int # the position of the protocol in the
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# ordered list of supported protocols
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# Private fields:
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peerStateInitializer*: PeerStateInitializer
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networkStateInitializer*: NetworkStateInitializer
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onPeerConnected*: OnPeerConnectedHandler
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onPeerDisconnected*: OnPeerDisconnectedHandler
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ProtocolInfo* = ptr ProtocolInfoObj
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ResponseCode* = enum
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Success
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InvalidRequest
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ServerError
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PeerStateInitializer* = proc(peer: Peer): RootRef {.gcsafe.}
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NetworkStateInitializer* = proc(network: EthereumNode): RootRef {.gcsafe.}
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OnPeerConnectedHandler* = proc(peer: Peer, conn: Connection): Future[void] {.gcsafe.}
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OnPeerDisconnectedHandler* = proc(peer: Peer): Future[void] {.gcsafe.}
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ThunkProc* = LPProtoHandler
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MounterProc* = proc(network: Eth2Node) {.gcsafe.}
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MessageContentPrinter* = proc(msg: pointer): string {.gcsafe.}
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DisconnectionReason* = enum
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# might see other values on the wire!
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ClientShutDown = 1
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IrrelevantNetwork = 2
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FaultOrError = 3
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PeerDisconnected* = object of CatchableError
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reason*: DisconnectionReason
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TransmissionError* = object of CatchableError
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Eth2NetworkingErrorKind* = enum
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BrokenConnection
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ReceivedErrorResponse
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UnexpectedEOF
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PotentiallyExpectedEOF
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InvalidResponseCode
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InvalidSnappyBytes
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InvalidSszBytes
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StreamOpenTimeout
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ReadResponseTimeout
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ZeroSizePrefix
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SizePrefixOverflow
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Eth2NetworkingError = object
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case kind*: Eth2NetworkingErrorKind
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of ReceivedErrorResponse:
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responseCode: ResponseCode
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errorMsg: ErrorMsg
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else:
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discard
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NetRes*[T] = Result[T, Eth2NetworkingError]
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## This is type returned from all network requests
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const
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clientId* = "Nimbus beacon node v" & fullVersionStr
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networkKeyFilename = "privkey.protobuf"
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nodeMetadataFilename = "node-metadata.json"
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TCP = net.Protocol.IPPROTO_TCP
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HandshakeTimeout = FaultOrError
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# Spec constants
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# https://github.com/ethereum/eth2.0-specs/blob/dev/specs/networking/p2p-interface.md#eth-20-network-interaction-domains
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MAX_CHUNK_SIZE* = 1 * 1024 * 1024 # bytes
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GOSSIP_MAX_SIZE* = 1 * 1024 * 1024 # bytes
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TTFB_TIMEOUT* = 5.seconds
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RESP_TIMEOUT* = 10.seconds
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NewPeerScore* = 200
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## Score which will be assigned to new connected Peer
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PeerScoreLowLimit* = 0
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## Score after which peer will be kicked
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PeerScoreHighLimit* = 1000
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## Max value of peer's score
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ConcurrentConnections* = 10
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## Maximum number of active concurrent connection requests.
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SeenTableTimeTimeout* = 10.minutes
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## Seen period of time for timeout connections
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SeenTableTimeDeadPeer* = 10.minutes
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## Period of time for dead peers.
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SeenTableTimeIrrelevantNetwork* = 24.hours
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## Period of time for `IrrelevantNetwork` error reason.
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SeenTableTimeClientShutDown* = 10.minutes
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## Period of time for `ClientShutDown` error reason.
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SeemTableTimeFaultOrError* = 10.minutes
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## Period of time for `FaultOnError` error reason.
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template neterr(kindParam: Eth2NetworkingErrorKind): auto =
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err(type(result), Eth2NetworkingError(kind: kindParam))
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# Metrics for tracking attestation and beacon block loss
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declareCounter nbc_gossip_messages_sent,
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"Number of gossip messages sent by this peer"
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declareCounter nbc_gossip_messages_received,
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"Number of gossip messages received by this peer"
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declarePublicCounter nbc_successful_dials,
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"Number of successfully dialed peers"
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declarePublicCounter nbc_failed_dials,
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"Number of dialing attempts that failed"
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declarePublicCounter nbc_timeout_dials,
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"Number of dialing attempts that exceeded timeout"
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declarePublicGauge nbc_peers,
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"Number of active libp2p peers"
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proc safeClose(conn: Connection) {.async.} =
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if not conn.closed:
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await close(conn)
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const
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snappy_implementation {.strdefine.} = "libp2p"
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const useNativeSnappy = when snappy_implementation == "native": true
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elif snappy_implementation == "libp2p": false
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else: {.fatal: "Please set snappy_implementation to either 'libp2p' or 'native'".}
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template libp2pProtocol*(name: string, version: int) {.pragma.}
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template `$`*(peer: Peer): string = id(peer.info)
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chronicles.formatIt(Peer): $it
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template remote*(peer: Peer): untyped =
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peer.info.peerId
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proc openStream(node: Eth2Node,
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peer: Peer,
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protocolId: string): Future[Connection] {.async.} =
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let protocolId = protocolId & (if peer.lacksSnappy: "ssz" else: "ssz_snappy")
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try:
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result = await dial(node.switch, peer.info, protocolId)
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except CancelledError:
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raise
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except CatchableError:
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# TODO: LibP2P should raise a more specific exception here
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if peer.lacksSnappy == false:
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peer.lacksSnappy = true
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trace "Snappy connection failed. Trying without Snappy",
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peer, protocolId
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return await openStream(node, peer, protocolId)
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else:
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raise
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proc init*(T: type Peer, network: Eth2Node, info: PeerInfo): Peer {.gcsafe.}
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proc getPeer*(node: Eth2Node, peerInfo: PeerInfo): Peer {.gcsafe.} =
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let peerId = peerInfo.peerId
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result = node.peerPool.getOrDefault(peerId)
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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.} =
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result = peer.info.peerId
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proc getFuture*(peer: Peer): Future[void] {.inline.} =
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result = peer.info.lifeFuture()
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proc `<`*(a, b: Peer): bool =
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result = `<`(a.score, b.score)
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proc getScore*(a: Peer): int =
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result = a.score
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proc updateScore*(peer: Peer, score: int) {.inline.} =
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## Update peer's ``peer`` score with value ``score``.
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peer.score = peer.score + score
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if peer.score > PeerScoreHighLimit:
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peer.score = PeerScoreHighLimit
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proc isSeen*(network: ETh2Node, pinfo: PeerInfo): bool =
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let currentTime = now(chronos.Moment)
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let item = network.seenTable.getOrDefault(pinfo.peerId)
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if isNil(item.pinfo):
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# Peer is not in SeenTable.
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return false
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if currentTime >= item.stamp:
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# Peer is in SeenTable, but the time period has expired.
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network.seenTable.del(pinfo.peerId)
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return false
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return true
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proc addSeen*(network: ETh2Node, pinfo: PeerInfo,
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period: chronos.Duration) =
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let item = SeenItem(pinfo: pinfo, stamp: now(chronos.Moment) + period)
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network.seenTable[pinfo.peerId] = item
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proc disconnect*(peer: Peer, reason: DisconnectionReason,
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notifyOtherPeer = false) {.async.} =
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# TODO: How should we notify the other peer?
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if peer.connectionState notin {Disconnecting, Disconnected}:
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peer.connectionState = Disconnecting
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await peer.network.switch.disconnect(peer.info)
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peer.connectionState = Disconnected
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peer.network.peerPool.release(peer)
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let seenTime = case reason
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of ClientShutDown:
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SeenTableTimeClientShutDown
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of IrrelevantNetwork:
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SeenTableTimeIrrelevantNetwork
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of FaultOrError:
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SeemTableTimeFaultOrError
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peer.network.addSeen(peer.info, seenTime)
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peer.info.close()
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include eth/p2p/p2p_backends_helpers
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include eth/p2p/p2p_tracing
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proc getRequestProtoName(fn: NimNode): NimNode =
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# `getCustomPragmaVal` doesn't work yet on regular nnkProcDef nodes
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# (TODO: file as an issue)
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let pragmas = fn.pragma
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if pragmas.kind == nnkPragma and pragmas.len > 0:
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for pragma in pragmas:
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if pragma.len > 0 and $pragma[0] == "libp2pProtocol":
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let protoName = $(pragma[1])
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let protoVer = $(pragma[2].intVal)
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return newLit("/eth2/beacon_chain/req/" & protoName & "/" & protoVer & "/")
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return newLit("")
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template raisePeerDisconnected(msg: string, r: DisconnectionReason) =
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var e = newException(PeerDisconnected, msg)
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e.reason = r
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raise e
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proc disconnectAndRaise(peer: Peer,
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reason: DisconnectionReason,
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msg: string) {.async.} =
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let r = reason
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await peer.disconnect(r)
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raisePeerDisconnected(msg, r)
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proc writeChunk*(conn: Connection,
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responseCode: Option[ResponseCode],
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payload: Bytes,
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noSnappy: bool) {.async.} =
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var output = memoryOutput()
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if responseCode.isSome:
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output.write byte(responseCode.get)
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output.write varintBytes(payload.len.uint64)
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if noSnappy:
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output.write(payload)
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else:
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output.write(framingFormatCompress payload)
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await conn.write(output.getOutput)
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template errorMsgLit(x: static string): ErrorMsg =
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const val = ErrorMsg toBytes(x)
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val
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proc formatErrorMsg(msg: ErrorMSg): string =
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let candidate = string.fromBytes(asSeq(msg))
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for c in candidate:
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# TODO UTF-8 - but let's start with ASCII
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if ord(c) < 32 or ord(c) > 127:
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return byteutils.toHex(asSeq(msg))
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return candidate
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proc sendErrorResponse(peer: Peer,
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conn: Connection,
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noSnappy: bool,
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responseCode: ResponseCode,
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errMsg: ErrorMsg) {.async.} =
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debug "Error processing request",
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peer, responseCode, errMsg = formatErrorMsg(errMsg)
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await conn.writeChunk(some responseCode, SSZ.encode(errMsg), noSnappy)
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proc sendNotificationMsg(peer: Peer, protocolId: string, requestBytes: Bytes) {.async} =
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var
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deadline = sleepAsync RESP_TIMEOUT
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streamFut = peer.network.openStream(peer, protocolId)
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await streamFut or deadline
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if not streamFut.finished:
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streamFut.cancel()
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raise newException(TransmissionError, "Failed to open LibP2P stream")
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let stream = streamFut.read
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try:
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await stream.writeChunk(none ResponseCode, requestBytes, peer.lacksSnappy)
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finally:
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await safeClose(stream)
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proc sendResponseChunkBytes(response: UntypedResponse, payload: Bytes) {.async.} =
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inc response.writtenChunks
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await response.stream.writeChunk(some Success, payload, response.noSnappy)
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proc sendResponseChunkObj(response: UntypedResponse, val: auto) {.async.} =
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inc response.writtenChunks
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await response.stream.writeChunk(some Success, SSZ.encode(val), response.noSnappy)
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template sendUserHandlerResultAsChunkImpl*(stream: Connection,
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noSnappy: bool,
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handlerResultFut: Future): untyped =
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let handlerRes = await handlerResultFut
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writeChunk(stream, some Success, SSZ.encode(handlerRes), noSnappy)
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template sendUserHandlerResultAsChunkImpl*(stream: Connection,
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noSnappy: bool,
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handlerResult: auto): untyped =
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writeChunk(stream, some Success, SSZ.encode(handlerResult), noSnappy)
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when useNativeSnappy:
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include faststreams_backend
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else:
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include libp2p_streams_backend
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proc makeEth2Request(peer: Peer, protocolId: string, requestBytes: Bytes,
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ResponseMsg: type,
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timeout: Duration): Future[NetRes[ResponseMsg]]
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{.gcsafe, async.} =
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var deadline = sleepAsync timeout
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let stream = awaitWithTimeout(peer.network.openStream(peer, protocolId),
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deadline): return neterr StreamOpenTimeout
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try:
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# Send the request
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await stream.writeChunk(none ResponseCode, requestBytes, peer.lacksSnappy)
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# Read the response
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return awaitWithTimeout(
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readResponse(when useNativeSnappy: libp2pInput(stream)
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else: stream,
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peer.lacksSnappy,
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ResponseMsg),
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deadline, neterr(ReadResponseTimeout))
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finally:
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await safeClose(stream)
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proc init*[MsgType](T: type MultipleChunksResponse[MsgType],
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peer: Peer, conn: Connection, noSnappy: bool): T =
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T(UntypedResponse(peer: peer, stream: conn, noSnappy: noSnappy))
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proc init*[MsgType](T: type SingleChunkResponse[MsgType],
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peer: Peer, conn: Connection, noSnappy: bool): T =
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T(UntypedResponse(peer: peer, stream: conn, noSnappy: noSnappy))
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template write*[M](r: MultipleChunksResponse[M], val: M): untyped =
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sendResponseChunkObj(UntypedResponse(r), val)
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template send*[M](r: SingleChunkResponse[M], val: auto): untyped =
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doAssert UntypedResponse(r).writtenChunks == 0
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sendResponseChunkObj(UntypedResponse(r), val)
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proc performProtocolHandshakes*(peer: Peer) {.async.} =
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var subProtocolsHandshakes = newSeqOfCap[Future[void]](allProtocols.len)
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for protocol in allProtocols:
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if protocol.onPeerConnected != nil:
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subProtocolsHandshakes.add protocol.onPeerConnected(peer, nil)
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await allFuturesThrowing(subProtocolsHandshakes)
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proc initProtocol(name: string,
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peerInit: PeerStateInitializer,
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networkInit: NetworkStateInitializer): ProtocolInfoObj =
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result.name = name
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result.messages = @[]
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result.peerStateInitializer = peerInit
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result.networkStateInitializer = networkInit
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proc registerProtocol(protocol: ProtocolInfo) =
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# TODO: This can be done at compile-time in the future
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let pos = lowerBound(gProtocols, protocol)
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gProtocols.insert(protocol, pos)
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for i in 0 ..< gProtocols.len:
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gProtocols[i].index = i
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|
proc setEventHandlers(p: ProtocolInfo,
|
|
onPeerConnected: OnPeerConnectedHandler,
|
|
onPeerDisconnected: OnPeerDisconnectedHandler) =
|
|
p.onPeerConnected = onPeerConnected
|
|
p.onPeerDisconnected = onPeerDisconnected
|
|
|
|
proc implementSendProcBody(sendProc: SendProc) =
|
|
let
|
|
msg = sendProc.msg
|
|
UntypedResponse = bindSym "UntypedResponse"
|
|
|
|
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
|
|
quote:
|
|
makeEth2Request(`peer`, `msgProto`, `bytes`,
|
|
`ResponseRecord`, `timeoutVar`)
|
|
else:
|
|
quote: sendNotificationMsg(`peer`, `msgProto`, `bytes`)
|
|
else:
|
|
quote: sendResponseChunkBytes(`UntypedResponse`(`peer`), `bytes`)
|
|
|
|
sendProc.useStandardBody(nil, nil, sendCallGenerator)
|
|
|
|
proc handleIncomingStream(network: Eth2Node,
|
|
conn: Connection,
|
|
noSnappy: bool,
|
|
MsgType: type) {.async, gcsafe.} =
|
|
mixin callUserHandler, RecType
|
|
|
|
type MsgRec = RecType(MsgType)
|
|
const msgName {.used.} = typetraits.name(MsgType)
|
|
|
|
## 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)
|
|
# trace "incoming " & `msgNameLit` & " conn"
|
|
|
|
try:
|
|
let peer = peerFromStream(network, conn)
|
|
|
|
# TODO peer connection setup is broken, update info in some better place
|
|
# whenever race is fix:
|
|
# https://github.com/status-im/nim-beacon-chain/issues/1157
|
|
peer.info = conn.peerInfo
|
|
|
|
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)
|
|
|
|
proc handleOutgoingPeer*(peer: Peer): Future[bool] {.async.} =
|
|
let network = peer.network
|
|
|
|
proc onPeerClosed(udata: pointer) {.gcsafe.} =
|
|
debug "Peer (outgoing) lost", peer
|
|
nbc_peers.set int64(len(network.peerPool))
|
|
|
|
let res = await network.peerPool.addOutgoingPeer(peer)
|
|
if res:
|
|
peer.updateScore(NewPeerScore)
|
|
debug "Peer (outgoing) has been added to PeerPool", peer
|
|
peer.getFuture().addCallback(onPeerClosed)
|
|
result = true
|
|
|
|
nbc_peers.set int64(len(network.peerPool))
|
|
|
|
proc handleIncomingPeer*(peer: Peer): Future[bool] {.async.} =
|
|
let network = peer.network
|
|
|
|
proc onPeerClosed(udata: pointer) {.gcsafe.} =
|
|
debug "Peer (incoming) lost", peer
|
|
nbc_peers.set int64(len(network.peerPool))
|
|
|
|
let res = await network.peerPool.addIncomingPeer(peer)
|
|
if res:
|
|
peer.updateScore(NewPeerScore)
|
|
debug "Peer (incoming) has been added to PeerPool", peer
|
|
peer.getFuture().addCallback(onPeerClosed)
|
|
result = true
|
|
|
|
nbc_peers.set int64(len(network.peerPool))
|
|
|
|
proc toPeerInfo*(r: enr.TypedRecord): PeerInfo =
|
|
if r.secp256k1.isSome:
|
|
var pubKey = keys.PublicKey.fromRaw(r.secp256k1.get)
|
|
if pubkey.isErr:
|
|
return # TODO
|
|
|
|
let peerId = PeerID.init crypto.PublicKey(
|
|
scheme: Secp256k1, skkey: secp.SkPublicKey(pubKey[]))
|
|
var addresses = newSeq[MultiAddress]()
|
|
|
|
if r.ip.isSome and r.tcp.isSome:
|
|
let ip = ipv4(r.ip.get)
|
|
addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp.get)
|
|
|
|
if r.ip6.isSome:
|
|
let ip = ipv6(r.ip6.get)
|
|
if r.tcp6.isSome:
|
|
addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp6.get)
|
|
elif r.tcp.isSome:
|
|
addresses.add MultiAddress.init(ip, tcpProtocol, Port r.tcp.get)
|
|
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 dialPeer*(node: Eth2Node, peerInfo: PeerInfo) {.async.} =
|
|
logScope: peer = peerInfo.id
|
|
|
|
debug "Connecting to discovered peer"
|
|
await node.switch.connect(peerInfo)
|
|
var peer = node.getPeer(peerInfo)
|
|
peer.wasDialed = true
|
|
|
|
#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 performProtocolHandshakes(peer)
|
|
|
|
inc nbc_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)
|
|
let r3 = network.connTable.hasKey(pi.peerId)
|
|
|
|
if not(r1) and not(r2) and not(r3):
|
|
network.connTable[pi.peerId] = pi
|
|
try:
|
|
# We trying to connect to peers which are not in PeerPool, SeenTable and
|
|
# ConnTable.
|
|
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.id,
|
|
errMsg = fut.readError().msg
|
|
inc nbc_failed_dials
|
|
network.addSeen(pi, SeenTableTimeDeadPeer)
|
|
continue
|
|
debug "Connection to remote peer timed out", peer = pi.id
|
|
inc nbc_timeout_dials
|
|
network.addSeen(pi, SeenTableTimeTimeout)
|
|
finally:
|
|
network.connTable.del(pi.peerId)
|
|
else:
|
|
trace "Peer is already connected, connecting or already seen",
|
|
peer = pi.id, peer_pool_has_peer = $r1, seen_table_has_peer = $r2,
|
|
connecting_peer = $r3, seen_table_size = len(network.seenTable)
|
|
|
|
proc runDiscoveryLoop*(node: Eth2Node) {.async.} =
|
|
debug "Starting discovery loop"
|
|
|
|
let enrField = ("eth2", SSZ.encode(node.forkId))
|
|
while true:
|
|
let currentPeerCount = node.peerPool.len
|
|
if currentPeerCount < node.wantedPeers:
|
|
try:
|
|
let discoveredPeers =
|
|
node.discovery.randomNodes(node.wantedPeers - currentPeerCount,
|
|
enrField)
|
|
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:
|
|
await node.connQueue.addLast(peerInfo)
|
|
else:
|
|
peerInfo.close()
|
|
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,
|
|
switch: Switch, ip: Option[ValidIpAddress], tcpPort, udpPort: Port,
|
|
privKey: keys.PrivateKey): T =
|
|
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.connTable = initTable[PeerID, PeerInfo]()
|
|
result.connQueue = newAsyncQueue[PeerInfo](ConcurrentConnections)
|
|
result.metadata = getPersistentNetMetadata(conf)
|
|
result.forkId = enrForkId
|
|
result.discovery = Eth2DiscoveryProtocol.new(
|
|
conf, ip, tcpPort, udpPort, privKey,
|
|
{"eth2": SSZ.encode(result.forkId), "attnets": SSZ.encode(result.metadata.attnets)})
|
|
|
|
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
|
|
|
|
template publicKey*(node: Eth2Node): keys.PublicKey =
|
|
node.discovery.privKey.toPublicKey
|
|
|
|
template addKnownPeer*(node: Eth2Node, peer: enr.Record) =
|
|
node.discovery.addNode peer
|
|
|
|
proc startListening*(node: Eth2Node) =
|
|
node.discovery.open()
|
|
|
|
proc start*(node: Eth2Node) {.async.} =
|
|
for i in 0 ..< ConcurrentConnections:
|
|
node.connWorkers.add connectWorker(node)
|
|
|
|
node.libp2pTransportLoops = await node.switch.start()
|
|
node.discovery.start()
|
|
node.discoveryLoop = node.runDiscoveryLoop()
|
|
traceAsyncErrors node.discoveryLoop
|
|
|
|
proc stop*(node: Eth2Node) {.async.} =
|
|
# 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)
|
|
|
|
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,
|
|
libp2pCodecName: string) =
|
|
protocol.messages.add MessageInfo(name: name,
|
|
protocolMounter: mounter,
|
|
libp2pCodecName: libp2pCodecName)
|
|
|
|
proc p2pProtocolBackendImpl*(p: P2PProtocol): Backend =
|
|
var
|
|
Format = ident "SSZ"
|
|
Bool = bindSym "bool"
|
|
Connection = bindSym "Connection"
|
|
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"
|
|
|
|
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"
|
|
|
|
result.afterProtocolInit = proc (p: P2PProtocol) =
|
|
p.onPeerConnected.params.add newIdentDefs(streamVar, Connection)
|
|
|
|
result.implementMsg = proc (msg: p2p_protocol_dsl.Message) =
|
|
if msg.kind == msgResponse:
|
|
return
|
|
|
|
let
|
|
protocol = msg.protocol
|
|
msgName = $msg.ident
|
|
msgNameLit = newLit msgName
|
|
MsgRecName = msg.recName
|
|
MsgStrongRecName = msg.strongRecName
|
|
codecNameLit = getRequestProtoName(msg.procDef)
|
|
protocolMounterName = ident(msgName & "Mounter")
|
|
|
|
##
|
|
## Implement the Thunk:
|
|
##
|
|
## The protocol handlers in nim-libp2p receive only a `Connection`
|
|
## 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)
|
|
|
|
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)
|
|
|
|
##
|
|
## 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,
|
|
codecNameLit))
|
|
|
|
result.implementProtocolInit = proc (p: P2PProtocol): NimNode =
|
|
return newCall(initProtocol, newLit(p.name), p.peerInit, p.netInit)
|
|
|
|
proc setupNat(conf: BeaconNodeConf): tuple[ip: Option[ValidIpAddress],
|
|
tcpPort: Port,
|
|
udpPort: Port] {.gcsafe.} =
|
|
# defaults
|
|
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:
|
|
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:
|
|
error "not a valid NAT mechanism", value = conf.nat
|
|
quit QuitFailure
|
|
|
|
if nat != NatNone:
|
|
let extIp = getExternalIP(nat)
|
|
if extIP.isSome:
|
|
result.ip = some(ValidIpAddress.init extIp.get)
|
|
# 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 =
|
|
PublicKey(scheme: Secp256k1, skkey: secp.SkPublicKey(key))
|
|
|
|
func asEthKey*(key: PrivateKey): keys.PrivateKey =
|
|
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 =
|
|
MultiAddress.init(address, tcpProtocol, port)
|
|
|
|
proc getPersistentNetKeys*(conf: BeaconNodeConf): KeyPair =
|
|
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()
|
|
|
|
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,
|
|
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,
|
|
sign = false, verifySignature = false,
|
|
transportFlags = {ServerFlags.ReuseAddr})
|
|
result = Eth2Node.init(conf, enrForkId, switch,
|
|
extIp, extTcpPort, extUdpPort,
|
|
keys.seckey.asEthKey)
|
|
|
|
proc getPersistenBootstrapAddr*(conf: BeaconNodeConf,
|
|
ip: ValidIpAddress, port: Port): EnrResult[enr.Record] =
|
|
let pair = getPersistentNetKeys(conf)
|
|
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 =
|
|
$PeerID.init(id.pubkey)
|
|
|
|
proc startLookingForPeers*(node: Eth2Node) {.async.} =
|
|
await node.start()
|
|
|
|
proc checkIfConnectedToBootstrapNode {.async.} =
|
|
await sleepAsync(30.seconds)
|
|
if node.discovery.bootstrapRecords.len > 0 and nbc_successful_dials.value == 0:
|
|
fatal "Failed to connect to any bootstrap node. Quitting",
|
|
bootstrapEnrs = node.discovery.bootstrapRecords
|
|
quit 1
|
|
|
|
traceAsyncErrors checkIfConnectedToBootstrapNode()
|
|
|
|
func peersCount*(node: Eth2Node): int =
|
|
len(node.peerPool)
|
|
|
|
proc subscribe*[MsgType](node: Eth2Node,
|
|
topic: string,
|
|
msgHandler: proc(msg: MsgType) {.gcsafe.},
|
|
msgValidator: proc(msg: MsgType): bool {.gcsafe.} ) {.async, gcsafe.} =
|
|
template execMsgHandler(peerExpr, gossipBytes, gossipTopic, useSnappy) =
|
|
inc nbc_gossip_messages_received
|
|
trace "Incoming pubsub message received",
|
|
peer = peerExpr, len = gossipBytes.len, topic = gossipTopic,
|
|
message_id = `$`(sha256.digest(gossipBytes))
|
|
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.
|
|
template execMsgValidator(gossipBytes, gossipTopic, useSnappy): bool =
|
|
trace "Incoming pubsub message received for validation",
|
|
len = gossipBytes.len, topic = gossipTopic,
|
|
message_id = `$`(sha256.digest(gossipBytes))
|
|
when useSnappy:
|
|
msgValidator SSZ.decode(snappy.decode(gossipBytes), MsgType)
|
|
else:
|
|
msgValidator SSZ.decode(gossipBytes, MsgType)
|
|
|
|
# Validate messages as soon as subscribed
|
|
let incomingMsgValidator = proc(topic: string,
|
|
message: GossipMsg): Future[bool]
|
|
{.async, gcsafe.} =
|
|
return execMsgValidator(message.data, topic, false)
|
|
let incomingMsgValidatorSnappy = proc(topic: string,
|
|
message: GossipMsg): Future[bool]
|
|
{.async, gcsafe.} =
|
|
return execMsgValidator(message.data, topic, true)
|
|
|
|
node.switch.addValidator(topic, incomingMsgValidator)
|
|
node.switch.addValidator(topic & "_snappy", incomingMsgValidatorSnappy)
|
|
|
|
let incomingMsgHandler = proc(topic: string,
|
|
data: seq[byte]) {.async, gcsafe.} =
|
|
execMsgHandler "unknown", data, topic, false
|
|
let incomingMsgHandlerSnappy = proc(topic: string,
|
|
data: seq[byte]) {.async, gcsafe.} =
|
|
execMsgHandler "unknown", data, topic, true
|
|
|
|
var switchSubscriptions: seq[Future[void]] = @[]
|
|
switchSubscriptions.add(node.switch.subscribe(topic, incomingMsgHandler))
|
|
switchSubscriptions.add(node.switch.subscribe(topic & "_snappy", incomingMsgHandlerSnappy))
|
|
|
|
await allFutures(switchSubscriptions)
|
|
|
|
proc traceMessage(fut: FutureBase, digest: MDigest[256]) =
|
|
fut.addCallback do (arg: pointer):
|
|
if not(fut.failed):
|
|
trace "Outgoing pubsub message sent", message_id = `$`(digest)
|
|
|
|
proc broadcast*(node: Eth2Node, topic: string, msg: auto) =
|
|
inc nbc_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
|
|
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
|