feat: autosharding content topics in config (#1856)

- added content topic to config.
- updated ENR building to include content topics.

apps/wakunode2/app.nim

@@ -127,9 +127,27 @@ proc init*(T: type App, rng: ref HmacDrbgContext, conf: WakuNodeConf): T =
 
   enrBuilder.withMultiaddrs(netConfig.enrMultiaddrs)
 
-  let addShardedTopics = enrBuilder.withShardedTopics(conf.topics)
+  let contentTopicsRes = conf.contentTopics.mapIt(NsContentTopic.parse(it))
+
+  for res in contentTopicsRes:
+    if res.isErr():
+      error "failed to parse content topic", error=res.error
+      quit(QuitFailure)
+
+  let pubsubTopicsRes = contentTopicsRes.mapIt(singleHighestWeigthShard(it.get()))
+
+  for res in pubsubTopicsRes:
+    if res.isErr():
+      error "failed to shard content topic", error=res.error
+      quit(QuitFailure)
+
+  let pubsubTopics = pubsubTopicsRes.mapIt($it.get())
+
+  let topics = pubsubTopics & conf.pubsubTopics
+
+  let addShardedTopics = enrBuilder.withShardedTopics(topics)
   if addShardedTopics.isErr():
-      error "failed to add sharded topics", error=addShardedTopics.error
+      error "failed to add sharded topics to ENR", error=addShardedTopics.error
       quit(QuitFailure)
 
   let recordRes = enrBuilder.build()
@@ -341,7 +359,7 @@ proc setupProtocols(node: WakuNode,
     peerExchangeHandler = some(handlePeerExchange)
 
   if conf.relay:
-    let pubsubTopics = conf.topics
+    let pubsubTopics = conf.pubsubTopics
     try:
       await mountRelay(node, pubsubTopics, peerExchangeHandler = peerExchangeHandler)
     except CatchableError:

apps/wakunode2/external_config.nim

@@ -225,10 +225,14 @@ type
       defaultValue: false
       name: "keep-alive" }: bool
 
-    topics* {.
+    pubsubTopics* {.
-      desc: "Default topic to subscribe to. Argument may be repeated."
+      desc: "Default pubsub topic to subscribe to. Argument may be repeated."
       defaultValue: @["/waku/2/default-waku/proto"]
-      name: "topic" .}: seq[string]
+      name: "pubsub-topic" .}: seq[string]
+
+    contentTopics* {.
+      desc: "Default content topic to subscribe to. Argument may be repeated."
+      name: "content-topic" .}: seq[string]
 
     ## Store and message store config
 

tests/wakunode2/test_app.nim

@@ -23,7 +23,7 @@ proc defaultTestWakuNodeConf(): WakuNodeConf =
     metricsServerAddress: ValidIpAddress.init("127.0.0.1"),
     nat: "any",
     maxConnections: 50,
-    topics: @["/waku/2/default-waku/proto"],
+    pubsubTopics: @["/waku/2/default-waku/proto"],
     relay: true
   )