mirror of https://github.com/status-im/nim-eth.git
215 lines
7.2 KiB
Nim
215 lines
7.2 KiB
Nim
# PeerPool attempts to keep connections to at least min_peers
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# on the given network.
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import
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os, tables, times, random, sequtils, options,
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chronos, chronicles, eth/[rlp, keys, common],
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private/p2p_types, discovery, kademlia, rlpx
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const
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lookupInterval = 5
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connectLoopSleep = chronos.milliseconds(2000)
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proc newPeerPool*(network: EthereumNode,
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networkId: uint, keyPair: KeyPair,
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discovery: DiscoveryProtocol, clientId: string,
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listenPort = Port(30303), minPeers = 10): PeerPool =
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new result
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result.network = network
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result.keyPair = keyPair
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result.minPeers = minPeers
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result.networkId = networkId
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result.discovery = discovery
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result.connectedNodes = initTable[Node, Peer]()
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result.connectingNodes = initSet[Node]()
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result.observers = initTable[int, PeerObserver]()
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result.listenPort = listenPort
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template ensureFuture(f: untyped) = asyncCheck f
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proc nodesToConnect(p: PeerPool): seq[Node] {.inline.} =
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p.discovery.randomNodes(p.minPeers).filterIt(it notin p.discovery.bootstrapNodes)
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proc addObserver(p: PeerPool, observerId: int, observer: PeerObserver) =
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doAssert(observerId notin p.observers)
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p.observers[observerId] = observer
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if not observer.onPeerConnected.isNil:
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for peer in p.connectedNodes.values:
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if observer.protocol.isNil or peer.supports(observer.protocol):
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observer.onPeerConnected(peer)
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proc delObserver(p: PeerPool, observerId: int) =
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p.observers.del(observerId)
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proc addObserver*(p: PeerPool, observerId: ref, observer: PeerObserver) {.inline.} =
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p.addObserver(cast[int](observerId), observer)
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proc delObserver*(p: PeerPool, observerId: ref) {.inline.} =
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p.delObserver(cast[int](observerId))
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template setProtocol*(observer: PeerObserver, Protocol: type) =
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observer.protocol = Protocol.protocolInfo
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proc stopAllPeers(p: PeerPool) {.async.} =
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debug "Stopping all peers ..."
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# TODO: ...
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# await asyncio.gather(
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# *[peer.stop() for peer in self.connected_nodes.values()])
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# async def stop(self) -> None:
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# self.cancel_token.trigger()
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# await self.stop_all_peers()
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proc connect(p: PeerPool, remote: Node): Future[Peer] {.async.} =
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## Connect to the given remote and return a Peer instance when successful.
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## Returns nil if the remote is unreachable, times out or is useless.
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if remote in p.connectedNodes:
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trace "skipping_connection_to_already_connected_peer", remote
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return nil
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if remote in p.connectingNodes:
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# debug "skipping connection"
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return nil
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trace "Connecting to node", remote
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p.connectingNodes.incl(remote)
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result = await p.network.rlpxConnect(remote)
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p.connectingNodes.excl(remote)
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# expected_exceptions = (
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# UnreachablePeer, TimeoutError, PeerConnectionLost, HandshakeFailure)
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# try:
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# self.logger.debug("Connecting to %s...", remote)
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# peer = await wait_with_token(
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# handshake(remote, self.privkey, self.peer_class, self.network_id),
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# token=self.cancel_token,
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# timeout=HANDSHAKE_TIMEOUT)
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# return peer
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# except OperationCancelled:
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# # Pass it on to instruct our main loop to stop.
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# raise
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# except expected_exceptions as e:
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# self.logger.debug("Could not complete handshake with %s: %s", remote, repr(e))
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# except Exception:
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# self.logger.exception("Unexpected error during auth/p2p handshake with %s", remote)
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# return None
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proc lookupRandomNode(p: PeerPool) {.async.} =
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# This method runs in the background, so we must catch OperationCancelled
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# ere otherwise asyncio will warn that its exception was never retrieved.
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try:
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discard await p.discovery.lookupRandom()
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except: # OperationCancelled
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discard
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p.lastLookupTime = epochTime()
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proc getRandomBootnode(p: PeerPool): Option[Node] =
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if p.discovery.bootstrapNodes.len != 0:
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result = option(p.discovery.bootstrapNodes.rand())
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proc addPeer*(pool: PeerPool, peer: Peer) {.gcsafe.} =
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doAssert(peer.remote notin pool.connectedNodes)
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pool.connectedNodes[peer.remote] = peer
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{.gcsafe.}:
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peerGauge.inc()
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for o in pool.observers.values:
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if not o.onPeerConnected.isNil:
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if o.protocol.isNil or peer.supports(o.protocol):
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o.onPeerConnected(peer)
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proc connectToNode*(p: PeerPool, n: Node) {.async.} =
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let peer = await p.connect(n)
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if not peer.isNil:
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trace "Connection established (outgoing)", peer
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p.addPeer(peer)
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proc connectToNodes(p: PeerPool, nodes: seq[Node]) {.async.} =
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for node in nodes:
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discard p.connectToNode(node)
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# # TODO: Consider changing connect() to raise an exception instead of
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# # returning None, as discussed in
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# # https://github.com/ethereum/py-evm/pull/139#discussion_r152067425
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# echo "Connecting to node: ", node
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# let peer = await p.connect(node)
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# if not peer.isNil:
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# info "Successfully connected to ", peer
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# ensureFuture peer.run(p)
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# p.connectedNodes[peer.remote] = peer
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# # for subscriber in self._subscribers:
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# # subscriber.register_peer(peer)
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# if p.connectedNodes.len >= p.minPeers:
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# return
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proc maybeConnectToMorePeers(p: PeerPool) {.async.} =
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## Connect to more peers if we're not yet connected to at least self.minPeers.
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if p.connectedNodes.len >= p.minPeers:
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# debug "pool already connected to enough peers (sleeping)", count = p.connectedNodes
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return
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if p.lastLookupTime + lookupInterval < epochTime():
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ensureFuture p.lookupRandomNode()
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let debugEnode = getEnv("ETH_DEBUG_ENODE")
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if debugEnode.len != 0:
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await p.connectToNode(newNode(debugEnode))
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else:
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await p.connectToNodes(p.nodesToConnect())
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# In some cases (e.g ROPSTEN or private testnets), the discovery table might
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# be full of bad peers, so if we can't connect to any peers we try a random
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# bootstrap node as well.
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if p.connectedNodes.len == 0 and (let n = p.getRandomBootnode(); n.isSome):
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await p.connectToNode(n.get())
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proc run(p: PeerPool) {.async.} =
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trace "Running PeerPool..."
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p.running = true
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while p.running:
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var dropConnections = false
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try:
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await p.maybeConnectToMorePeers()
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except Exception as e:
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# Most unexpected errors should be transient, so we log and restart from
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# scratch.
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error "Unexpected PeerPool error, restarting",
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err = getCurrentExceptionMsg(),
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stackTrace = e.getStackTrace()
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dropConnections = true
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if dropConnections:
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await p.stopAllPeers()
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await sleepAsync(connectLoopSleep)
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proc start*(p: PeerPool) =
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if not p.running:
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asyncCheck p.run()
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proc len*(p: PeerPool): int = p.connectedNodes.len
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# @property
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# def peers(self) -> List[BasePeer]:
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# peers = list(self.connected_nodes.values())
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# # Shuffle the list of peers so that dumb callsites are less likely to send
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# # all requests to
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# # a single peer even if they always pick the first one from the list.
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# random.shuffle(peers)
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# return peers
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# async def get_random_peer(self) -> BasePeer:
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# while not self.peers:
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# self.logger.debug("No connected peers, sleeping a bit")
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# await asyncio.sleep(0.5)
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# return random.choice(self.peers)
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iterator peers*(p: PeerPool): Peer =
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for remote, peer in p.connectedNodes:
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yield peer
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iterator peers*(p: PeerPool, Protocol: type): Peer =
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for peer in p.peers:
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if peer.supports(Protocol):
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yield peer
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