Address some TODO items; Handle start-up before genesis more properly

beacon_chain/beacon_node.nim

@@ -31,6 +31,7 @@ import
 
 const
   genesisFile* = "genesis.ssz"
+  timeToInitNetworkingBeforeGenesis = chronos.seconds(10)
   hasPrompt = not defined(withoutPrompt)
 
 type
@@ -145,7 +146,7 @@ proc init*(T: type BeaconNode, conf: BeaconNodeConf): Future[BeaconNode] {.async
     if genesisState.isNil:
       # Didn't work, try creating a genesis state using main chain monitor
       # TODO Could move this to a separate "GenesisMonitor" process or task
-      #      that would do only this - see
+      #      that would do only this - see Paul's proposal for this.
       if conf.web3Url.len > 0 and conf.depositContractAddress.len > 0:
         mainchainMonitor = MainchainMonitor.init(
           web3Provider(conf.web3Url),
@@ -226,8 +227,10 @@ proc init*(T: type BeaconNode, conf: BeaconNodeConf): Future[BeaconNode] {.async
     topicAggregateAndProofs: topicAggregateAndProofs,
   )
 
-  # TODO sync is called when a remote peer is connected - is that the right
+  traceAsyncErrors res.addLocalValidators()
-  #      time to do so?
+
+  # This merely configures the BeaconSync
+  # The traffic will be started when we join the network.
   network.initBeaconSync(blockPool, enrForkId.forkDigest,
     proc(signedBlock: SignedBeaconBlock) =
       if signedBlock.message.slot.isEpoch:
@@ -251,9 +254,6 @@ proc init*(T: type BeaconNode, conf: BeaconNodeConf): Future[BeaconNode] {.async
 
   return res
 
-proc connectToNetwork(node: BeaconNode) {.async.} =
-  await node.network.connectToNetwork()
-
 proc onAttestation(node: BeaconNode, attestation: Attestation) =
   # We received an attestation from the network but don't know much about it
   # yet - in particular, we haven't verified that it belongs to particular chain
@@ -807,15 +807,25 @@ proc createPidFile(filename: string) =
   gPidFile = filename
   addQuitProc proc {.noconv.} = removeFile gPidFile
 
+proc initializeNetworking(node: BeaconNode) {.async.} =
+  node.network.startListening()
+
+  let addressFile = node.config.dataDir / "beacon_node.address"
+  writeFile(addressFile, node.network.announcedENR.toURI)
+
+  await node.network.startLookingForPeers()
+
 proc start(node: BeaconNode) =
-  # TODO: while it's nice to cheat by waiting for connections here, we
-  #       actually need to make this part of normal application flow -
-  #       losing all connections might happen at any time and we should be
-  #       prepared to handle it.
   let
     head = node.blockPool.head
     finalizedHead = node.blockPool.finalizedHead
 
+  let genesisTime = node.beaconClock.fromNow(toBeaconTime(Slot 0))
+
+  if genesisTime.inFuture and genesisTime.offset > timeToInitNetworkingBeforeGenesis:
+    info "Waiting for the genesis event", genesisIn = genesisTime.offset
+    waitFor sleepAsync(genesisTime.offset - timeToInitNetworkingBeforeGenesis)
+
   info "Starting beacon node",
     version = fullVersionStr,
     timeSinceFinalization =
@@ -832,21 +842,7 @@ proc start(node: BeaconNode) =
     cat = "init",
     pcs = "start_beacon_node"
 
-  node.network.startListening()
+  waitFor node.initializeNetworking()
-  let addressFile = node.config.dataDir / "beacon_node.address"
-  writeFile(addressFile, node.network.announcedENR.toURI)
-
-  let bs = BlockSlot(blck: head.blck, slot: head.blck.slot)
-
-  node.blockPool.withState(node.blockPool.tmpState, bs):
-    for validatorKey in node.config.validatorKeys:
-      node.addLocalValidator state, validatorKey
-      # Allow some network events to be processed:
-      waitFor sleepAsync(1)
-
-    info "Local validators attached ", count = node.attachedValidators.count
-
-  waitFor node.network.connectToNetwork()
   node.run()
 
 func formatGwei(amount: uint64): string =

beacon_chain/eth2_network.nim

@@ -1115,7 +1115,7 @@ proc announcedENR*(node: Eth2Node): enr.Record =
 proc shortForm*(id: KeyPair): string =
   $PeerID.init(id.pubkey)
 
-proc connectToNetwork*(node: Eth2Node) {.async.} =
+proc startLookingForPeers*(node: Eth2Node) {.async.} =
   await node.start()
 
   proc checkIfConnectedToBootstrapNode {.async.} =
@@ -1125,9 +1125,7 @@ proc connectToNetwork*(node: Eth2Node) {.async.} =
         bootstrapEnrs = node.discovery.bootstrapRecords
       quit 1
 
-  # TODO: The initial sync forces this to time out.
+  traceAsyncErrors checkIfConnectedToBootstrapNode()
-  #       Revisit when the new Sync manager is integrated.
-  # traceAsyncErrors checkIfConnectedToBootstrapNode()
 
 func peersCount*(node: Eth2Node): int =
   len(node.peerPool)

beacon_chain/validator_duties.nim

@@ -53,6 +53,19 @@ proc addLocalValidator*(node: BeaconNode,
 
   node.attachedValidators.addLocalValidator(pubKey, privKey)
 
+proc addLocalValidators*(node: BeaconNode) {.async.} =
+  let
+    head = node.blockPool.head
+    bs = BlockSlot(blck: head.blck, slot: head.blck.slot)
+
+  node.blockPool.withState(node.blockPool.tmpState, bs):
+    for validatorKey in node.config.validatorKeys:
+      node.addLocalValidator state, validatorKey
+      # Allow some network events to be processed:
+      await sleepAsync(0.seconds)
+
+    info "Local validators attached ", count = node.attachedValidators.count
+
 func getAttachedValidator*(node: BeaconNode,
                            state: BeaconState,
                            idx: ValidatorIndex): AttachedValidator =

tests/test_peer_connection.nim

@@ -36,5 +36,5 @@ asyncTest "connect two nodes":
   c2.nat = "none"
   var n2 = await createEth2Node(c2, ENRForkID())
 
-  await n2.connectToNetwork(@[n1PersistentAddress])
+  await n2.startLookingForPeers(@[n1PersistentAddress])