feat: check filter subscriptions against lightPush

packages/interfaces/src/filter.ts

@@ -20,7 +20,7 @@ export type SubscriptionCallback<T extends IDecodedMessage> = {
 export type SubscribeOptions = {
   keepAlive?: number;
   pingsBeforePeerRenewed?: number;
-  maxMissedMessagesThreshold?: number;
+  enableLightPushFilterCheck?: boolean;
 };
 
 export interface ISubscription {

packages/message-hash/src/index.ts

@@ -2,7 +2,7 @@ import { sha256 } from "@noble/hashes/sha256";
 import type { IDecodedMessage, IProtoMessage } from "@waku/interfaces";
 import { isDefined } from "@waku/utils";
 import {
-  bytesToUtf8,
+  bytesToHex,
   concat,
   numberToBytes,
   utf8ToBytes
@@ -56,6 +56,6 @@ export function messageHashStr(
   message: IProtoMessage | IDecodedMessage
 ): string {
   const hash = messageHash(pubsubTopic, message);
-  const hashStr = bytesToUtf8(hash);
+  const hashStr = bytesToHex(hash);
   return hashStr;
 }

packages/sdk/src/protocols/filter/constants.ts

@@ -1,5 +1,8 @@
 export const DEFAULT_KEEP_ALIVE = 10_000;
+export const DEFAULT_LIGHT_PUSH_FILTER_CHECK = false;
+export const DEFAULT_LIGHT_PUSH_FILTER_CHECK_INTERVAL = 10_000;
 
 export const DEFAULT_SUBSCRIBE_OPTIONS = {
-  keepAlive: DEFAULT_KEEP_ALIVE
+  keepAlive: DEFAULT_KEEP_ALIVE,
+  enableLightPushFilterCheck: DEFAULT_LIGHT_PUSH_FILTER_CHECK
 };

packages/sdk/src/protocols/filter/index.ts

@@ -6,6 +6,7 @@ import {
   type IDecodedMessage,
   type IDecoder,
   type IFilter,
+  type ILightPush,
   type Libp2p,
   NetworkConfig,
   type ProtocolCreateOptions,
@@ -38,7 +39,8 @@ class Filter extends BaseProtocolSDK implements IFilter {
 
   public constructor(
     connectionManager: ConnectionManager,
-    libp2p: Libp2p,
+    private libp2p: Libp2p,
+    private lightPush?: ILightPush,
     options?: ProtocolCreateOptions
   ) {
     super(
@@ -195,7 +197,9 @@ class Filter extends BaseProtocolSDK implements IFilter {
           this.protocol,
           this.connectionManager,
           () => this.connectedPeers,
-          this.renewPeer.bind(this)
+          this.renewPeer.bind(this),
+          this.libp2p,
+          this.lightPush
         )
       );
 
@@ -300,7 +304,9 @@ class Filter extends BaseProtocolSDK implements IFilter {
 
 export function wakuFilter(
   connectionManager: ConnectionManager,
+  lightPush?: ILightPush,
   init?: ProtocolCreateOptions
 ): (libp2p: Libp2p) => IFilter {
-  return (libp2p: Libp2p) => new Filter(connectionManager, libp2p, init);
+  return (libp2p: Libp2p) =>
+    new Filter(connectionManager, libp2p, lightPush, init);
 }

packages/sdk/src/protocols/filter/subscription_manager.ts

@@ -1,15 +1,23 @@
 import type { Peer } from "@libp2p/interface";
 import type { PeerId } from "@libp2p/interface";
-import { ConnectionManager, FilterCore } from "@waku/core";
+import {
+  ConnectionManager,
+  createDecoder,
+  createEncoder,
+  FilterCore,
+  LightPushCore
+} from "@waku/core";
 import {
   type Callback,
   type ContentTopic,
   type CoreProtocolResult,
   EConnectionStateEvents,
   type IDecodedMessage,
   type IDecoder,
+  type ILightPush,
   type IProtoMessage,
   type ISubscription,
+  type Libp2p,
   type PeerIdStr,
   ProtocolError,
   type PubsubTopic,
@@ -23,7 +31,12 @@ import { groupByContentTopic, Logger } from "@waku/utils";
 import { ReliabilityMonitorManager } from "../../reliability_monitor/index.js";
 import { ReceiverReliabilityMonitor } from "../../reliability_monitor/receiver.js";
 
-import { DEFAULT_KEEP_ALIVE, DEFAULT_SUBSCRIBE_OPTIONS } from "./constants.js";
+import {
+  DEFAULT_KEEP_ALIVE,
+  DEFAULT_LIGHT_PUSH_FILTER_CHECK,
+  DEFAULT_LIGHT_PUSH_FILTER_CHECK_INTERVAL,
+  DEFAULT_SUBSCRIBE_OPTIONS
+} from "./constants.js";
 
 const log = new Logger("sdk:filter:subscription_manager");
 
@@ -33,6 +46,8 @@ export class SubscriptionManager implements ISubscription {
   private keepAliveTimeout: number = DEFAULT_KEEP_ALIVE;
   private keepAliveInterval: ReturnType<typeof setInterval> | null = null;
 
+  private enableLightPushFilterCheck = DEFAULT_LIGHT_PUSH_FILTER_CHECK;
+
   private subscriptionCallbacks: Map<
     ContentTopic,
     SubscriptionCallback<IDecodedMessage>
@@ -45,7 +60,9 @@ export class SubscriptionManager implements ISubscription {
     private readonly getPeers: () => Peer[],
     private readonly renewPeer: (
       peerToDisconnect: PeerId
-    ) => Promise<Peer | undefined>
+    ) => Promise<Peer | undefined>,
+    private readonly libp2p: Libp2p,
+    private readonly lightPush?: ILightPush
   ) {
     this.pubsubTopic = pubsubTopic;
     this.subscriptionCallbacks = new Map();
@@ -56,7 +73,8 @@ export class SubscriptionManager implements ISubscription {
       this.renewPeer.bind(this),
       () => Array.from(this.subscriptionCallbacks.keys()),
       this.protocol.subscribe.bind(this.protocol),
-      this.protocol.addLibp2pEventListener.bind(this.protocol)
+      this.protocol.addLibp2pEventListener.bind(this.protocol),
+      this.sendLightPushCheckMessage.bind(this)
     );
   }
 
@@ -65,11 +83,10 @@ export class SubscriptionManager implements ISubscription {
     callback: Callback<T>,
     options: SubscribeOptions = DEFAULT_SUBSCRIBE_OPTIONS
   ): Promise<SDKProtocolResult> {
-    this.reliabilityMonitor.setMaxMissedMessagesThreshold(
-      options.maxMissedMessagesThreshold
-    );
     this.reliabilityMonitor.setMaxPingFailures(options.pingsBeforePeerRenewed);
     this.keepAliveTimeout = options.keepAlive || DEFAULT_KEEP_ALIVE;
+    this.enableLightPushFilterCheck =
+      options?.enableLightPushFilterCheck || DEFAULT_LIGHT_PUSH_FILTER_CHECK;
 
     const decodersArray = Array.isArray(decoders) ? decoders : [decoders];
 
@@ -87,11 +104,20 @@ export class SubscriptionManager implements ISubscription {
       }
     }
 
+    if (this.enableLightPushFilterCheck) {
+      decodersArray.push(
+        createDecoder(
+          this.buildLightPushContentTopic(),
+          this.pubsubTopic
+        ) as IDecoder<T>
+      );
+    }
+
     const decodersGroupedByCT = groupByContentTopic(decodersArray);
     const contentTopics = Array.from(decodersGroupedByCT.keys());
 
     const promises = this.getPeers().map(async (peer) =>
-      this.protocol.subscribe(this.pubsubTopic, peer, contentTopics)
+      this.subscribeWithPeerVerification(peer, contentTopics)
     );
 
     const results = await Promise.allSettled(promises);
@@ -109,6 +135,11 @@ export class SubscriptionManager implements ISubscription {
         callback
       } as unknown as SubscriptionCallback<IDecodedMessage>;
 
+      // don't handle case of internal content topic
+      if (contentTopic === this.buildLightPushContentTopic()) {
+        return;
+      }
+
       // The callback and decoder may override previous values, this is on
       // purpose as the user may call `subscribe` to refresh the subscription
       this.subscriptionCallbacks.set(contentTopic, subscriptionCallback);
@@ -176,10 +207,9 @@ export class SubscriptionManager implements ISubscription {
     message: WakuMessage,
     peerIdStr: PeerIdStr
   ): Promise<void> {
-    const alreadyReceived = this.reliabilityMonitor.processIncomingMessage(
-      message,
-      this.pubsubTopic,
-      peerIdStr
+    const alreadyReceived = this.reliabilityMonitor.notifyMessageReceived(
+      peerIdStr,
+      message as IProtoMessage
     );
 
     if (alreadyReceived) {
@@ -202,6 +232,19 @@ export class SubscriptionManager implements ISubscription {
     await pushMessage(subscriptionCallback, this.pubsubTopic, message);
   }
 
+  private async subscribeWithPeerVerification(
+    peer: Peer,
+    contentTopics: string[]
+  ): Promise<CoreProtocolResult> {
+    const result = await this.protocol.subscribe(
+      this.pubsubTopic,
+      peer,
+      contentTopics
+    );
+    await this.sendLightPushCheckMessage(peer);
+    return result;
+  }
+
   private handleResult(
     results: PromiseSettledResult<CoreProtocolResult>[],
     type: "ping" | "subscribe" | "unsubscribe" | "unsubscribeAll"
@@ -324,6 +367,46 @@ export class SubscriptionManager implements ISubscription {
     clearInterval(this.keepAliveInterval);
     this.keepAliveInterval = null;
   }
+
+  private async sendLightPushCheckMessage(peer: Peer): Promise<void> {
+    if (
+      this.lightPush &&
+      this.libp2p &&
+      this.reliabilityMonitor.shouldVerifyPeer(peer.id)
+    ) {
+      const encoder = createEncoder({
+        contentTopic: this.buildLightPushContentTopic(),
+        pubsubTopic: this.pubsubTopic,
+        ephemeral: true
+      });
+
+      const message = { payload: new Uint8Array(1) };
+      const protoMessage = await encoder.toProtoObj(message);
+
+      // make a delay to be sure message is send when subscription is in place
+      setTimeout(
+        (async () => {
+          const result = await (this.lightPush!.protocol as LightPushCore).send(
+            encoder,
+            message,
+            peer
+          );
+          this.reliabilityMonitor.notifyMessageSent(peer.id, protoMessage);
+          if (result.failure) {
+            log.error(
+              `failed to send lightPush ping message to peer:${peer.id.toString()}\t${result.failure.error}`
+            );
+            return;
+          }
+        }) as () => void,
+        DEFAULT_LIGHT_PUSH_FILTER_CHECK_INTERVAL
+      );
+    }
+  }
+
+  private buildLightPushContentTopic(): string {
+    return `/js-waku-subscription-ping/1/${this.libp2p.peerId.toString()}/utf8`;
+  }
 }
 
 async function pushMessage<T extends IDecodedMessage>(

packages/sdk/src/reliability_monitor/index.ts

@@ -24,7 +24,8 @@ export class ReliabilityMonitorManager {
       peer: Peer,
       contentTopics: ContentTopic[]
     ) => Promise<CoreProtocolResult>,
-    addLibp2pEventListener: Libp2p["addEventListener"]
+    addLibp2pEventListener: Libp2p["addEventListener"],
+    sendLightPushMessage: (peer: Peer) => Promise<void>
   ): ReceiverReliabilityMonitor {
     if (ReliabilityMonitorManager.receiverMonitors.has(pubsubTopic)) {
       return ReliabilityMonitorManager.receiverMonitors.get(pubsubTopic)!;
@@ -36,7 +37,8 @@ export class ReliabilityMonitorManager {
       renewPeer,
       getContentTopics,
       protocolSubscribe,
-      addLibp2pEventListener
+      addLibp2pEventListener,
+      sendLightPushMessage
     );
     ReliabilityMonitorManager.receiverMonitors.set(pubsubTopic, monitor);
     return monitor;
@@ -50,7 +52,6 @@ export class ReliabilityMonitorManager {
 
   public static stopAll(): void {
     for (const [pubsubTopic, monitor] of this.receiverMonitors) {
-      monitor.setMaxMissedMessagesThreshold(undefined);
       monitor.setMaxPingFailures(undefined);
       this.receiverMonitors.delete(pubsubTopic);
     }