From 02c821ce327d83b02c4ea591c6541acdbc578c10 Mon Sep 17 00:00:00 2001
From: NagyZoltanPeter <113987313+NagyZoltanPeter@users.noreply.github.com>
Date: Mon, 12 Jan 2026 10:14:09 +0100
Subject: [PATCH] Adapt code for using broker context

---
 waku/api/api.nim                              |  4 +-
 waku/api/types.nim                            | 15 ++--
 waku/common/broker/broker_context.nim         | 74 +++++++++++++++----
 waku/factory/waku.nim                         |  7 +-
 .../recv_service/recv_service.nim             | 22 ++++--
 .../send_service/delivery_task.nim            | 10 ++-
 .../send_service/lightpush_processor.nim      |  7 +-
 .../send_service/relay_processor.nim          | 15 ++--
 .../send_service/send_processor.nim           |  2 +
 .../send_service/send_service.nim             | 23 ++++--
 waku/node/waku_node.nim                       |  5 ++
 waku/waku_filter_v2/client.nim                | 10 ++-
 12 files changed, 143 insertions(+), 51 deletions(-)

diff --git a/waku/api/api.nim b/waku/api/api.nim
index a63379f12..4079e9b0d 100644
--- a/waku/api/api.nim
+++ b/waku/api/api.nim
@@ -26,7 +26,7 @@ proc checkApiAvailability(w: Waku): Result[void, string] =
 
   # check if health is satisfactory
   # If Node is not healthy, return err("Waku node is not healthy")
-  let healthStatus = RequestNodeHealth.request()
+  let healthStatus = RequestNodeHealth.request(w.brokerCtx)
 
   if healthStatus.isErr():
     warn "Failed to get Waku node health status: ", error = healthStatus.error
@@ -44,7 +44,7 @@ proc send*(
 
   let requestId = newRequestId(w.rng)
 
-  let deliveryTask = DeliveryTask.create(requestId, envelope).valueOr:
+  let deliveryTask = DeliveryTask.create(requestId, envelope, w.brokerCtx).valueOr:
     return err("Failed to create delivery task: " & error)
 
   asyncSpawn w.deliveryService.sendService.send(deliveryTask)
diff --git a/waku/api/types.nim b/waku/api/types.nim
index c42718d1b..e78cd87e3 100644
--- a/waku/api/types.nim
+++ b/waku/api/types.nim
@@ -51,14 +51,15 @@ proc toWakuMessage*(envelope: MessageEnvelope): WakuMessage =
     timestamp: getNanosecondTime(getTime().toUnixFloat()),
   )
 
-  # TODO: First find out if proof is needed at all
-  let requestedProof = (
-    waitFor RequestGenerateRlnProof.request(wm, getTime().toUnixFloat())
-  ).valueOr:
-    warn "Failed to add RLN proof to WakuMessage: ", error = error
-    return wm
+  ## TODO: First find out if proof is needed at all
+  ## Follow up: left it to the send logic to add RLN proof if needed and possible
+  # let requestedProof = (
+  #   waitFor RequestGenerateRlnProof.request(wm, getTime().toUnixFloat())
+  # ).valueOr:
+  #   warn "Failed to add RLN proof to WakuMessage: ", error = error
+  #   return wm
 
-  wm.proof = requestedProof.proof
+  # wm.proof = requestedProof.proof
   return wm
 
 {.pop.}
diff --git a/waku/common/broker/broker_context.nim b/waku/common/broker/broker_context.nim
index 1b8235f6a..483a2e3a7 100644
--- a/waku/common/broker/broker_context.nim
+++ b/waku/common/broker/broker_context.nim
@@ -1,26 +1,68 @@
-import std/[strutils, sysrand]
+{.push raises: [].}
+
+import std/[strutils, concurrency/atomics], chronos
 
 type BrokerContext* = distinct uint32
 
-func `==`*(a, b: BrokerContext): bool {.borrow.}
+func `==`*(a, b: BrokerContext): bool =
+  uint32(a) == uint32(b)
+
+func `!=`*(a, b: BrokerContext): bool =
+  uint32(a) != uint32(b)
 
 func `$`*(bc: BrokerContext): string =
   toHex(uint32(bc), 8)
 
 const DefaultBrokerContext* = BrokerContext(0xCAFFE14E'u32)
 
-proc NewBrokerContext*(): BrokerContext =
-  ## Generates a random non-default broker context (as a raw uint32).
+# Global broker context accessor.
+#
+# NOTE: This intentionally creates a *single* active BrokerContext per process
+# (per event loop thread). Use only if you accept serialization of all broker
+# context usage through the lock.
+var globalBrokerContextLock {.threadvar.}: AsyncLock
+globalBrokerContextLock = newAsyncLock()
+var globalBrokerContextValue {.threadvar.}: BrokerContext
+globalBrokerContextValue = DefaultBrokerContext
+proc globalBrokerContext*(): BrokerContext =
+  ## Returns the currently active global broker context.
   ##
-  ## The default broker context is reserved for the provider at index 0.
-  ## This helper never returns that value.
-  for _ in 0 ..< 16:
-    let b = urandom(4)
-    if b.len != 4:
-      continue
-    let key =
-      (uint32(b[0]) shl 24) or (uint32(b[1]) shl 16) or (uint32(b[2]) shl 8) or
-      uint32(b[3])
-    if key != uint32(DefaultBrokerContext):
-      return BrokerContext(key)
-  BrokerContext(1'u32)
+  ## This is intentionally lock-free; callers should use it inside
+  ## `withNewGlobalBrokerContext` / `withGlobalBrokerContext`.
+  globalBrokerContextValue
+
+var gContextCounter: Atomic[uint32]
+
+proc NewBrokerContext*(): BrokerContext =
+  var nextId = gContextCounter.fetchAdd(1, moRelaxed)
+  if nextId == uint32(DefaultBrokerContext):
+    nextId = gContextCounter.fetchAdd(1, moRelaxed)
+  return BrokerContext(nextId)
+
+template lockGlobalBrokerContext*(brokerCtx: BrokerContext, body: untyped): untyped =
+  ## Runs `body` while holding the global broker context lock with the provided
+  ## `brokerCtx` installed as the globally accessible context.
+  ##
+  ## This template is intended for use from within `chronos` async procs.
+  block:
+    await noCancel(globalBrokerContextLock.acquire())
+    let previousBrokerCtx = globalBrokerContextValue
+    globalBrokerContextValue = brokerCtx
+    try:
+      body
+    finally:
+      globalBrokerContextValue = previousBrokerCtx
+      try:
+        globalBrokerContextLock.release()
+      except AsyncLockError:
+        doAssert false, "globalBrokerContextLock.release(): lock not held"
+
+template lockNewGlobalBrokerContext*(body: untyped): untyped =
+  ## Runs `body` while holding the global broker context lock with a freshly
+  ## generated broker context installed as the global accessor.
+  ##
+  ## The previous global broker context (if any) is restored on exit.
+  lockGlobalBrokerContext(NewBrokerContext()):
+    body
+
+{.pop.}
diff --git a/waku/factory/waku.nim b/waku/factory/waku.nim
index 40b9110dd..970b36eee 100644
--- a/waku/factory/waku.nim
+++ b/waku/factory/waku.nim
@@ -44,7 +44,8 @@ import
   ../factory/internal_config,
   ../factory/app_callbacks,
   ../waku_enr/multiaddr,
-  ./waku_conf
+  ./waku_conf,
+  ../common/broker/broker_context
 
 logScope:
   topics = "wakunode waku"
@@ -75,6 +76,8 @@ type Waku* = ref object
   metricsServer*: MetricsHttpServerRef
   appCallbacks*: AppCallbacks
 
+  brokerCtx*: BrokerContext
+
 func version*(waku: Waku): string =
   waku.version
 
@@ -163,6 +166,7 @@ proc new*(
     T: type Waku, wakuConf: WakuConf, appCallbacks: AppCallbacks = nil
 ): Future[Result[Waku, string]] {.async.} =
   let rng = crypto.newRng()
+  let brokerCtx = globalBrokerContext()
 
   logging.setupLog(wakuConf.logLevel, wakuConf.logFormat)
 
@@ -213,6 +217,7 @@ proc new*(
     deliveryService: deliveryService,
     appCallbacks: appCallbacks,
     restServer: restServer,
+    brokerCtx: brokerCtx,
   )
 
   waku.setupSwitchServices(wakuConf, relay, rng)
diff --git a/waku/node/delivery_service/recv_service/recv_service.nim b/waku/node/delivery_service/recv_service/recv_service.nim
index 9fe98b4bd..91fe7ec4e 100644
--- a/waku/node/delivery_service/recv_service/recv_service.nim
+++ b/waku/node/delivery_service/recv_service/recv_service.nim
@@ -13,6 +13,7 @@ import
     waku_core/topics,
     events/delivery_events,
     waku_node,
+    common/broker/broker_context,
   ]
 
 const StoreCheckPeriod = chronos.minutes(5) ## How often to perform store queries
@@ -32,6 +33,7 @@ type RecvMessage = object
     ## timestamp of the rx message. We will not keep the rx messages forever
 
 type RecvService* = ref object of RootObj
+  brokerCtx: BrokerContext
   topicsInterest: Table[PubsubTopic, seq[ContentTopic]]
     ## Tracks message verification requests and when was the last time a
     ## pubsub topic was verified for missing messages
@@ -76,7 +78,12 @@ proc performDeliveryFeedback(
     success, dir, comment, msg_hash = shortLog(msgHash)
 
   DeliveryFeedbackEvent.emit(
-    success = success, dir = dir, comment = comment, msgHash = msgHash, msg = msg
+    brokerCtx = self.brokerCtx,
+    success = success,
+    dir = dir,
+    comment = comment,
+    msgHash = msgHash,
+    msg = msg,
   )
 
 proc msgChecker(self: RecvService) {.async.} =
@@ -153,7 +160,8 @@ proc new*(T: type RecvService, node: WakuNode): T =
   ## The storeClient will help to acquire any possible missed messages
 
   let now = getNowInNanosecondTime()
-  var recvService = RecvService(node: node, startTimeToCheck: now)
+  var recvService =
+    RecvService(node: node, startTimeToCheck: now, brokerCtx: node.brokerCtx)
 
   if not node.wakuFilterClient.isNil():
     let filterPushHandler = proc(
@@ -180,22 +188,24 @@ proc startRecvService*(self: RecvService) =
   self.msgPrunerHandler = self.loopPruneOldMessages()
 
   self.onSubscribeListener = OnFilterSubscribeEvent.listen(
+    self.brokerCtx,
     proc(subsEv: OnFilterSubscribeEvent): Future[void] {.async: (raises: []).} =
-      self.onSubscribe(subsEv.pubsubTopic, subsEv.contentTopics)
+      self.onSubscribe(subsEv.pubsubTopic, subsEv.contentTopics),
   ).valueOr:
     error "Failed to set OnFilterSubscribeEvent listener", error = error
     quit(QuitFailure)
 
   self.onUnsubscribeListener = OnFilterUnsubscribeEvent.listen(
+    self.brokerCtx,
     proc(subsEv: OnFilterUnsubscribeEvent): Future[void] {.async: (raises: []).} =
-      self.onUnsubscribe(subsEv.pubsubTopic, subsEv.contentTopics)
+      self.onUnsubscribe(subsEv.pubsubTopic, subsEv.contentTopics),
   ).valueOr:
     error "Failed to set OnFilterUnsubscribeEvent listener", error = error
     quit(QuitFailure)
 
 proc stopRecvService*(self: RecvService) {.async.} =
-  OnFilterSubscribeEvent.dropListener(self.onSubscribeListener)
-  OnFilterUnSubscribeEvent.dropListener(self.onUnsubscribeListener)
+  OnFilterSubscribeEvent.dropListener(self.brokerCtx, self.onSubscribeListener)
+  OnFilterUnsubscribeEvent.dropListener(self.brokerCtx, self.onUnsubscribeListener)
   if not self.msgCheckerHandler.isNil():
     await self.msgCheckerHandler.cancelAndWait()
   if not self.msgPrunerHandler.isNil():
diff --git a/waku/node/delivery_service/send_service/delivery_task.nim b/waku/node/delivery_service/send_service/delivery_task.nim
index efd272ad7..0f3c9d902 100644
--- a/waku/node/delivery_service/send_service/delivery_task.nim
+++ b/waku/node/delivery_service/send_service/delivery_task.nim
@@ -1,5 +1,6 @@
 import std/[options, times], chronos
 import waku/waku_core, waku/api/types, waku/requests/node_requests
+import waku/common/broker/broker_context
 
 type DeliveryState* {.pure.} = enum
   Entry
@@ -20,12 +21,17 @@ type DeliveryTask* = ref object
   errorDesc*: string
 
 proc create*(
-    T: type DeliveryTask, requestId: RequestId, envelop: MessageEnvelope
+    T: type DeliveryTask,
+    requestId: RequestId,
+    envelop: MessageEnvelope,
+    brokerCtx: BrokerContext,
 ): Result[T, string] =
   let msg = envelop.toWakuMessage()
   # TODO: use sync request for such as soon as available
   let relayShardRes = (
-    waitFor RequestRelayShard.request(none[PubsubTopic](), envelop.contentTopic)
+    waitFor RequestRelayShard.request(
+      brokerCtx, none[PubsubTopic](), envelop.contentTopic
+    )
   ).valueOr:
     return err($error)
 
diff --git a/waku/node/delivery_service/send_service/lightpush_processor.nim b/waku/node/delivery_service/send_service/lightpush_processor.nim
index 1233b3bc6..f6f077ff7 100644
--- a/waku/node/delivery_service/send_service/lightpush_processor.nim
+++ b/waku/node/delivery_service/send_service/lightpush_processor.nim
@@ -5,7 +5,8 @@ import
   waku/waku_node,
   waku/waku_core,
   waku/node/peer_manager,
-  waku/waku_lightpush/[callbacks, common, client, rpc]
+  waku/waku_lightpush/[callbacks, common, client, rpc],
+  waku/common/broker/broker_context
 
 import ./[delivery_task, send_processor]
 
@@ -20,8 +21,10 @@ proc new*(
     T: type LightpushSendProcessor,
     peerManager: PeerManager,
     lightpushClient: WakuLightPushClient,
+    brokerCtx: BrokerContext,
 ): T =
-  return T(peerManager: peerManager, lightpushClient: lightpushClient)
+  return
+    T(peerManager: peerManager, lightpushClient: lightpushClient, brokerCtx: brokerCtx)
 
 proc isLightpushPeerAvailable(
     self: LightpushSendProcessor, pubsubTopic: PubsubTopic
diff --git a/waku/node/delivery_service/send_service/relay_processor.nim b/waku/node/delivery_service/send_service/relay_processor.nim
index 51a68c839..4b826bd93 100644
--- a/waku/node/delivery_service/send_service/relay_processor.nim
+++ b/waku/node/delivery_service/send_service/relay_processor.nim
@@ -2,6 +2,7 @@ import chronos, chronicles
 import std/options
 import waku/[waku_node, waku_core], waku/waku_lightpush/[common, callbacks, rpc]
 import waku/requests/health_request
+import waku/common/broker/broker_context
 import waku/api/types
 import ./[delivery_task, send_processor]
 
@@ -16,6 +17,7 @@ proc new*(
     T: type RelaySendProcessor,
     lightpushAvailable: bool,
     publishProc: PushMessageHandler,
+    brokerCtx: BrokerContext,
 ): RelaySendProcessor =
   let fallbackStateToSet =
     if lightpushAvailable:
@@ -23,11 +25,14 @@ proc new*(
     else:
       DeliveryState.FailedToDeliver
 
-  return
-    RelaySendProcessor(publishProc: publishProc, fallbackStateToSet: fallbackStateToSet)
+  return RelaySendProcessor(
+    publishProc: publishProc,
+    fallbackStateToSet: fallbackStateToSet,
+    brokerCtx: brokerCtx,
+  )
 
-proc isTopicHealthy(topic: PubsubTopic): bool {.gcsafe.} =
-  let healthReport = RequestRelayTopicsHealth.request(@[topic]).valueOr:
+proc isTopicHealthy(self: RelaySendProcessor, topic: PubsubTopic): bool {.gcsafe.} =
+  let healthReport = RequestRelayTopicsHealth.request(self.brokerCtx, @[topic]).valueOr:
     return false
 
   if healthReport.topicHealth.len() < 1:
@@ -38,7 +43,7 @@ proc isTopicHealthy(topic: PubsubTopic): bool {.gcsafe.} =
 method isValidProcessor*(
     self: RelaySendProcessor, task: DeliveryTask
 ): bool {.gcsafe.} =
-  return isTopicHealthy(task.pubsubTopic)
+  return self.isTopicHealthy(task.pubsubTopic)
 
 method sendImpl*(self: RelaySendProcessor, task: DeliveryTask): Future[void] {.async.} =
   task.tryCount.inc()
diff --git a/waku/node/delivery_service/send_service/send_processor.nim b/waku/node/delivery_service/send_service/send_processor.nim
index 9de425d9f..0108eacd0 100644
--- a/waku/node/delivery_service/send_service/send_processor.nim
+++ b/waku/node/delivery_service/send_service/send_processor.nim
@@ -1,10 +1,12 @@
 import chronos
 import ./delivery_task
+import waku/common/broker/broker_context
 
 {.push raises: [].}
 
 type BaseSendProcessor* = ref object of RootObj
   fallbackProcessor*: BaseSendProcessor
+  brokerCtx*: BrokerContext
 
 proc chain*(self: BaseSendProcessor, next: BaseSendProcessor) =
   self.fallbackProcessor = next
diff --git a/waku/node/delivery_service/send_service/send_service.nim b/waku/node/delivery_service/send_service/send_service.nim
index 82e27d637..1a54da4a7 100644
--- a/waku/node/delivery_service/send_service/send_service.nim
+++ b/waku/node/delivery_service/send_service/send_service.nim
@@ -18,6 +18,7 @@ import
     waku_lightpush/callbacks,
     events/delivery_events,
     events/message_events,
+    common/broker/broker_context,
   ]
 
 logScope:
@@ -48,6 +49,7 @@ const ArchiveTime = chronos.seconds(3)
   ## received and archived by a store node
 
 type SendService* = ref object of RootObj
+  brokerCtx: BrokerContext
   taskCache: seq[DeliveryTask]
     ## Cache that contains the delivery task per message hash.
     ## This is needed to make sure the published messages are properly published
@@ -63,6 +65,7 @@ proc setupSendProcessorChain(
     lightpushClient: WakuLightPushClient,
     relay: WakuRelay,
     rlnRelay: WakuRLNRelay,
+    brokerCtx: BrokerContext,
 ): Result[BaseSendProcessor, string] =
   let isRelayAvail = not relay.isNil()
   let isLightPushAvail = not lightpushClient.isNil()
@@ -80,9 +83,9 @@ proc setupSendProcessorChain(
         some(rlnRelay)
     let publishProc = getRelayPushHandler(relay, rln)
 
-    processors.add(RelaySendProcessor.new(isLightPushAvail, publishProc))
+    processors.add(RelaySendProcessor.new(isLightPushAvail, publishProc, brokerCtx))
   if isLightPushAvail:
-    processors.add(LightpushSendProcessor.new(peerManager, lightpushClient))
+    processors.add(LightpushSendProcessor.new(peerManager, lightpushClient, brokerCtx))
 
   var currentProcessor: BaseSendProcessor = processors[0]
   for i in 1 ..< processors.len():
@@ -102,11 +105,12 @@ proc new*(
   let checkStoreForMessages = preferP2PReliability and not w.wakuStoreClient.isNil()
 
   let sendProcessorChain = setupSendProcessorChain(
-    w.peerManager, w.wakuLightPushClient, w.wakuRelay, w.wakuRlnRelay
+    w.peerManager, w.wakuLightPushClient, w.wakuRelay, w.wakuRlnRelay, w.brokerCtx
   ).valueOr:
     return err(error)
 
   let sendService = SendService(
+    brokerCtx: w.brokerCtx,
     taskCache: newSeq[DeliveryTask](),
     serviceLoopHandle: nil,
     sendProcessor: sendProcessorChain,
@@ -170,16 +174,18 @@ proc reportTaskResult(self: SendService, task: DeliveryTask) =
     # TODO: in case of of unable to strore check messages shall we report success instead?
     info "Message successfully propagated",
       requestId = task.requestId, msgHash = task.msgHash
-    MessagePropagatedEvent.emit(task.requestId, task.msgHash.toString())
+    MessagePropagatedEvent.emit(self.brokerCtx, task.requestId, task.msgHash.toString())
     return
   of DeliveryState.SuccessfullyValidated:
     info "Message successfully sent", requestId = task.requestId, msgHash = task.msgHash
-    MessageSentEvent.emit(task.requestId, task.msgHash.toString())
+    MessageSentEvent.emit(self.brokerCtx, task.requestId, task.msgHash.toString())
     return
   of DeliveryState.FailedToDeliver:
     error "Failed to send message",
       requestId = task.requestId, msgHash = task.msgHash, error = task.errorDesc
-    MessageErrorEvent.emit(task.requestId, task.msgHash.toString(), task.errorDesc)
+    MessageErrorEvent.emit(
+      self.brokerCtx, task.requestId, task.msgHash.toString(), task.errorDesc
+    )
     return
   else:
     # rest of the states are intermediate and does not translate to event
@@ -190,7 +196,10 @@ proc reportTaskResult(self: SendService, task: DeliveryTask) =
       requestId = task.requestId, msgHash = task.msgHash, error = "Message too old"
     task.state = DeliveryState.FailedToDeliver
     MessageErrorEvent.emit(
-      task.requestId, task.msgHash.toString(), "Unable to send within retry time window"
+      self.brokerCtx,
+      task.requestId,
+      task.msgHash.toString(),
+      "Unable to send within retry time window",
     )
 
 proc evaluateAndCleanUp(self: SendService) =
diff --git a/waku/node/waku_node.nim b/waku/node/waku_node.nim
index dc3f0b3a3..e946fbb35 100644
--- a/waku/node/waku_node.nim
+++ b/waku/node/waku_node.nim
@@ -57,6 +57,7 @@ import
     common/rate_limit/setting,
     common/callbacks,
     common/nimchronos,
+    common/broker/broker_context,
     waku_mix,
     requests/node_requests,
   ],
@@ -126,6 +127,7 @@ type
     enr*: enr.Record
     libp2pPing*: Ping
     rng*: ref rand.HmacDrbgContext
+    brokerCtx*: BrokerContext
     wakuRendezvous*: WakuRendezVous
     wakuRendezvousClient*: rendezvous_client.WakuRendezVousClient
     announcedAddresses*: seq[MultiAddress]
@@ -192,11 +194,14 @@ proc new*(
 
   info "Initializing networking", addrs = $netConfig.announcedAddresses
 
+  let brokerCtx = globalBrokerContext()
+
   let queue = newAsyncEventQueue[SubscriptionEvent](0)
   let node = WakuNode(
     peerManager: peerManager,
     switch: switch,
     rng: rng,
+    brokerCtx: brokerCtx,
     enr: enr,
     announcedAddresses: netConfig.announcedAddresses,
     topicSubscriptionQueue: queue,
diff --git a/waku/waku_filter_v2/client.nim b/waku/waku_filter_v2/client.nim
index 65aa0c8fa..816b6a83a 100644
--- a/waku/waku_filter_v2/client.nim
+++ b/waku/waku_filter_v2/client.nim
@@ -10,7 +10,7 @@ import
   bearssl/rand,
   stew/byteutils
 import
-  waku/[node/peer_manager, waku_core, events/delivery_events],
+  waku/[node/peer_manager, waku_core, events/delivery_events, common/broker/broker_context],
   ./common,
   ./protocol_metrics,
   ./rpc_codec,
@@ -20,6 +20,7 @@ logScope:
   topics = "waku filter client"
 
 type WakuFilterClient* = ref object of LPProtocol
+  brokerCtx: BrokerContext
   rng: ref HmacDrbgContext
   peerManager: PeerManager
   pushHandlers: seq[FilterPushHandler]
@@ -126,7 +127,7 @@ proc subscribe*(
 
   ?await wfc.sendSubscribeRequest(servicePeer, filterSubscribeRequest)
 
-  OnFilterSubscribeEvent.emit(pubSubTopic, contentTopicSeq)
+  OnFilterSubscribeEvent.emit(wfc.brokerCtx, pubsubTopic, contentTopicSeq)
 
   return ok()
 
@@ -202,6 +203,9 @@ proc initProtocolHandler(wfc: WakuFilterClient) =
 proc new*(
     T: type WakuFilterClient, peerManager: PeerManager, rng: ref HmacDrbgContext
 ): T =
-  let wfc = WakuFilterClient(rng: rng, peerManager: peerManager, pushHandlers: @[])
+  let brokerCtx = globalBrokerContext()
+  let wfc = WakuFilterClient(
+    brokerCtx: brokerCtx, rng: rng, peerManager: peerManager, pushHandlers: @[]
+  )
   wfc.initProtocolHandler()
   wfc