chat2 fix and code to temporarily convert from pubsub topics to shards

apps/chat2/chat2.nim

@@ -6,7 +6,7 @@ when not (compileOption("threads")):
 
 {.push raises: [].}
 
-import std/[strformat, strutils, times, options, random]
+import std/[strformat, strutils, times, options, random, sequtils]
 import
   confutils,
   chronicles,
@@ -379,7 +379,9 @@ proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
     raise newException(ConfigurationError, "rln-relay-cred-path MUST be passed")
 
   if conf.relay:
-    await node.mountRelay(conf.topics.split(" "))
+    let shards =
+      conf.shards.mapIt(RelayShard(clusterId: conf.clusterId, shardId: uint16(it)))
+    await node.mountRelay(shards)
 
   await node.mountLibp2pPing()
 

waku/factory/waku.nim

@@ -103,6 +103,20 @@ proc init*(T: type Waku, conf: WakuNodeConf): Result[Waku, string] =
 
   logging.setupLog(conf.logLevel, conf.logFormat)
 
+  # TODO: remove after pubsubtopic config gets removed
+  #[ let shards = newSeq[uint16]()
+  if conf.pubsubTopics.length > 0:
+    let shardsOpt = topicsToRelayShards(conf.pubsubTopics).valueOr:
+      error "failed to parse pubsub topic, please format according to static shard specification",
+        error = $error
+      return err("failed to parse pubsub topic: " & $error)
+
+    if shardsOpt.isSome():
+      let relayShards = shardsOpt.get()
+      for shard in relayShards:
+        shards.add(shard.shardId)
+      confCopy.shards = shards ]#
+
   case confCopy.clusterId
 
   # cluster-id=1 (aka The Waku Network)