feature/subscriptions-in-node (#141)

* test

* Update wakunode2.nim

* input from @kdeme

* Update wakunode2.nim

* moved

* Update waku_message.nim

* fixed

* fix

* fix

* fix

* fix

* fix

waku/node/v2/waku_types.nim

@@ -29,6 +29,18 @@ type
 
   Filters* = Table[string, Filter]
 
+  WakuMessage* = object
+    payload*: seq[byte]
+    contentTopic*: string
+
+  MessageNotificationHandler* = proc(topic: string, msg: WakuMessage) {.gcsafe, closure.}
+
+  MessageNotificationSubscriptions* = Table[string, MessageNotificationSubscription]
+
+  MessageNotificationSubscription* = object
+    topics*: seq[string] # @TODO TOPIC
+    handler*: MessageNotificationHandler
+
   # NOTE based on Eth2Node in NBC eth2_network.nim
   WakuNode* = ref object of RootObj
     switch*: Switch
@@ -38,10 +50,7 @@ type
   # TODO Revist messages field indexing as well as if this should be Message or WakuMessage
     messages*: seq[(Topic, WakuMessage)]
     filters*: Filters
-
-  WakuMessage* = object
-    payload*: seq[byte]
-    contentTopic*: string
+    subscriptions*: MessageNotificationSubscriptions
 
   WakuRelay* = ref object of GossipSub
     gossipEnabled*: bool

waku/node/v2/wakunode2.nim

@@ -10,7 +10,7 @@ import
   libp2p/protocols/pubsub/pubsub,
   libp2p/peerinfo,
   libp2p/standard_setup,
-  ../../protocol/v2/[waku_relay, waku_store, waku_filter],
+  ../../protocol/v2/[waku_relay, waku_store, waku_filter, message_notifier],
   ./waku_types
 
 logScope:
@@ -105,9 +105,18 @@ proc start*(node: WakuNode) {.async.} =
   # NOTE WakuRelay is being instantiated as part of initing node
   let storeProto = WakuStore.init()
   node.switch.mount(storeProto)
+  node.subscriptions.subscribe(WakuStoreCodec, storeProto.subscription())
 
   let filterProto = WakuFilter.init()
   node.switch.mount(filterProto)
+  node.subscriptions.subscribe(WakuFilterCodec, filterProto.subscription())
+
+  proc relayHandler(topic: string, data: seq[byte]) {.async, gcsafe.} =
+    let msg = WakuMessage.init(data)
+    if msg.isOk():
+      node.subscriptions.notify(topic, msg.value())
+
+  await node.wakuRelay.subscribe("waku", relayHandler)
 
   # TODO Get this from WakuNode obj
   let peerInfo = node.peerInfo

waku/protocol/v2/message_notifier.nim

@@ -7,16 +7,6 @@ import
 #
 # Protocols can subscribe to messages of specific topics, then when one is received
 # The notification handler function will be called.
-
-type
-  MessageNotificationHandler* = proc(topic: string, msg: WakuMessage) {.gcsafe, closure.}
-
-  MessageNotificationSubscription* = object
-    topics: seq[string] # @TODO TOPIC
-    handler: MessageNotificationHandler
-    
-  MessageNotificationSubscriptions* = Table[string, MessageNotificationSubscription]
-
 proc subscribe*(subscriptions: var MessageNotificationSubscriptions, name: string, subscription: MessageNotificationSubscription) =
   subscriptions.add(name, subscription)