Add external handler

src/nim_chat_poc.nim

@@ -1,13 +1,19 @@
 import
+  chronicles,
   chronos
 
 import
   waku_client
 
+
+proc handleMessages(pubsubTopic: string, message: seq[byte]): Future[
+    void] {.gcsafe, raises: [Defect].} =
+  info "ClientRecv", pubTopic = pubsubTopic, msg = message
+
 proc main(): Future[void] {.async.} =
   echo "Starting POC"
   let cfg = DefaultConfig()
-  let client = initWakuClient(cfg)
+  let client = initWakuClient(cfg, @[PayloadHandler(handleMessages)])
   await client.start()
   echo "End of POC"
 

src/waku_client.nim

@@ -27,6 +27,10 @@ const
   FilterContentTopic = ContentTopic("/chatsdk/test/proto")
 
 
+type PayloadHandler* = proc(pubsubTopic: string, message: seq[byte]): Future[void] {.
+    gcsafe, raises: [Defect]
+  .}
+
 type WakuConfig* = object
   port*: uint16
   clusterId*: uint16
@@ -37,6 +41,7 @@ type
   WakuClient* = ref object
     cfg: WakuConfig
     node*: WakuNode
+    handlers: seq[PayloadHandler]
 
 
 proc DefaultConfig*(): WakuConfig =
@@ -102,8 +107,8 @@ proc buildWakuNode(cfg: WakuConfig): WakuNode =
 
   result = node
 
-proc messagePushHandler(
-    pubsubTopic: PubsubTopic, message: WakuMessage
+proc messageHandler(client: WakuClient, pubsubTopic: PubsubTopic,
+    message: WakuMessage
 ) {.async, gcsafe.} =
   let payloadStr = string.fromBytes(message.payload)
   notice "message received",
@@ -113,6 +118,10 @@ proc messagePushHandler(
     timestamp = message.timestamp
 
 
+  for handler in client.handlers:
+    discard handler(pubsubTopic, message.payload)
+
+
 proc taskKeepAlive(client: WakuClient) {.async.} =
   let peer = parsePeerInfo(StaticPeer).get()
   while true:
@@ -154,19 +163,20 @@ proc start*(client: WakuClient) {.async.} =
     quit(1)
 
   client.node.peerManager.start()
-  client.node.wakuFilterClient.registerPushHandler(messagePushHandler)
-
-  let topic = PubsubTopic(client.cfg.pubsubTopic)
 
   let subscription: SubscriptionEvent = (kind: PubsubSub, topic:
     client.cfg.pubsubTopic)
 
-  let res = subscribe(client.node, subscription, messagePushHandler)
+  let msg_handler = proc(pubsubTopic: PubsubTopic,
+      message: WakuMessage) {.async, gcsafe.} = discard client.messageHandler(
+      pubsubTopic, message)
+
+  let res = subscribe(client.node, subscription, msg_handler)
   if res.isErr:
     error "Subscribe failed", err = res.error
 
   await allFutures(taskKeepAlive(client), taskPublishDemo(client))
 
-
-proc initWakuClient*(cfg: WakuConfig): WakuClient =
-  result = WakuClient(cfg: cfg, node: buildWakuNode(cfg))
+proc initWakuClient*(cfg: WakuConfig, handlers: seq[
+    PayloadHandler]): WakuClient =
+  result = WakuClient(cfg: cfg, node: buildWakuNode(cfg), handlers: handlers)