fix/libp2p-protocol-inheritance (#173)

waku/protocol/v2/waku_filter.nim

@@ -74,25 +74,22 @@ proc init*(T: type MessagePush, buffer: seq[byte]): ProtoResult[T] =
 
   ok(push)
 
-proc init*(T: type WakuFilter): T =
-  var ws = WakuFilter(subscribers: newSeq[Subscriber](0))
-
-  # From my understanding we need to set up filters,
-  # then on every message received we need the handle function to send it to the connection
-  # if the peer subscribed.
-  
+method init*(wf: WakuFilter) =
   proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
     var message = await conn.readLp(64*1024)
     var res = FilterRequest.init(message)
     if res.isErr:
       return
 
-    ws.subscribers.add(Subscriber(connection: conn, filter: res.value))
+    wf.subscribers.add(Subscriber(connection: conn, filter: res.value))
     # @TODO THIS IS A VERY ROUGH EXPERIMENT
 
-  ws.handler = handle
-  ws.codec = WakuFilterCodec
-  result = ws
+  wf.handler = handle
+  wf.codec = WakuFilterCodec
+
+proc init*(T: type WakuFilter): T =
+  new result
+  result.init()
 
 proc subscription*(proto: WakuFilter): MessageNotificationSubscription =
   ## Returns a Filter for the specific protocol

waku/protocol/v2/waku_store.nim

@@ -61,9 +61,7 @@ proc query(w: WakuStore, query: HistoryQuery): HistoryResponse =
     if msg.contentTopic in query.topics:
       result.messages.insert(msg)
 
-proc init*(T: type WakuStore): T =
-  var ws = WakuStore()
-  
+method init*(ws: WakuStore) =
   proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
     var message = await conn.readLp(64*1024)
     var rpc = HistoryQuery.init(message)
@@ -78,7 +76,10 @@ proc init*(T: type WakuStore): T =
 
   ws.handler = handle
   ws.codec = WakuStoreCodec
-  result = ws
+
+proc init*(T: type WakuStore): T =
+  new result
+  result.init()
 
 proc subscription*(proto: WakuStore): MessageNotificationSubscription =
   ## The filter function returns the pubsub filter for the node.