Add services

libp2p/services/hpservice.nim

@@ -0,0 +1,32 @@
+when (NimMajor, NimMinor) < (1, 4):
+  {.push raises: [Defect].}
+else:
+  {.push raises: [].}
+
+import ../switch
+import chronos
+import std/tables
+
+type
+  HPService* = ref object of Service
+    newPeerHandler: PeerEventHandler
+
+proc askPeer(s: Switch, peerId: PeerId): Future[void] {.async.} =
+  echo "Asking peer " & $(peerId)
+
+proc h(switch: Switch) =
+  for p in switch.peerStore[AddressBook].book.keys:
+    discard askPeer(switch, p)
+
+method setup*(self: HPService, switch: Switch) {.async.} =
+  self.newPeerHandler = proc (peerId: PeerId, event: PeerEvent): Future[void] =
+    return askPeer(switch, peerId)
+
+  switch.connManager.addPeerEventHandler(self.newPeerHandler, PeerEventKind.Joined)
+
+method run*(self: HPService, switch: Switch) {.async, gcsafe, public.} =
+  h(switch)
+
+method stop*(self: HPService, switch: Switch) {.async, gcsafe, public.} =
+  if not isNil(self.newPeerHandler):
+    switch.connManager.removePeerEventHandler(self.newPeerHandler, PeerEventKind.Joined)

libp2p/switch.nim

@@ -74,6 +74,13 @@ type
       peerStore*: PeerStore
       nameResolver*: NameResolver
       started: bool
+      services*: seq[Service]
+
+    Service* = ref object of RootObj
+
+method setup*(self: Service, switch: Switch) {.base, async, gcsafe, public.} = discard
+
+method run*(self: Service, switch: Switch) {.base, async, gcsafe, public.} = discard
 
 proc addConnEventHandler*(s: Switch,
                           handler: ConnEventHandler,
@@ -108,6 +115,9 @@ method addTransport*(s: Switch, t: Transport) =
   s.transports &= t
   s.dialer.addTransport(t)
 
+method addService*(switch: Switch, service: Service) =
+  switch.services.add(service)
+
 proc isConnected*(s: Switch, peerId: PeerId): bool {.public.} =
   ## returns true if the peer has one or more
   ## associated connections
@@ -326,6 +336,9 @@ proc start*(s: Switch) {.async, gcsafe, public.} =
 
   await s.ms.start()
 
+  for service in s.services:
+    await service.setup(s)
+
   s.started = true
 
   debug "Started libp2p node", peer = s.peerInfo
@@ -337,7 +350,8 @@ proc newSwitch*(peerInfo: PeerInfo,
                 connManager: ConnManager,
                 ms: MultistreamSelect,
                 nameResolver: NameResolver = nil,
-                peerStore = PeerStore.new()): Switch
+                peerStore = PeerStore.new(),
+                services = newSeq[Service]()): Switch
                 {.raises: [Defect, LPError], public.} =
   if secureManagers.len == 0:
     raise newException(LPError, "Provide at least one secure manager")
@@ -349,8 +363,10 @@ proc newSwitch*(peerInfo: PeerInfo,
     connManager: connManager,
     peerStore: peerStore,
     dialer: Dialer.new(peerInfo.peerId, connManager, transports, ms, nameResolver),
-    nameResolver: nameResolver)
+    nameResolver: nameResolver,
+    services: services)
 
   switch.connManager.peerStore = peerStore
   switch.mount(identity)
+
   return switch

tests/testswitch.nim

@@ -26,6 +26,8 @@ import ../libp2p/[errors,
                   transports/wstransport]
 import ./helpers
 
+import ../libp2p/services/hpservice
+
 const
   TestCodec = "/test/proto/1.0.0"
 
@@ -289,6 +291,8 @@ suite "Switch":
     switch2.addConnEventHandler(hook, ConnEventKind.Connected)
     switch2.addConnEventHandler(hook, ConnEventKind.Disconnected)
 
+    switch1.addService(HPService.new())
+
     await switch1.start()
     await switch2.start()