feat: setup sender monitor

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

@@ -13,6 +13,8 @@ import {
 } from "@waku/interfaces";
 import { ensurePubsubTopicIsConfigured, Logger } from "@waku/utils";
 
+import { ReliabilityMonitorManager } from "../../reliability_monitor/index.js";
+import { SenderReliabilityMonitor } from "../../reliability_monitor/sender.js";
 import { BaseProtocolSDK } from "../base_protocol.js";
 
 const log = new Logger("sdk:light-push");
@@ -20,6 +22,8 @@ const log = new Logger("sdk:light-push");
 class LightPushSDK extends BaseProtocolSDK implements ILightPushSDK {
   public readonly protocol: LightPushCore;
 
+  private readonly reliabilityMonitor: SenderReliabilityMonitor;
+
   public constructor(
     connectionManager: ConnectionManager,
     libp2p: Libp2p,
@@ -33,6 +37,10 @@ class LightPushSDK extends BaseProtocolSDK implements ILightPushSDK {
       }
     );
 
+    this.reliabilityMonitor = ReliabilityMonitorManager.createSenderMonitor(
+      this.renewPeer.bind(this)
+    );
+
     this.protocol = this.core as LightPushCore;
   }
 
@@ -89,16 +97,23 @@ class LightPushSDK extends BaseProtocolSDK implements ILightPushSDK {
           successes.push(success);
         }
         if (failure) {
-          if (failure.peerId) {
-            try {
-              await this.renewPeer(failure.peerId);
-              log.info("Renewed peer", failure.peerId.toString());
-            } catch (error) {
-              log.error("Failed to renew peer", error);
-            }
-          }
-
           failures.push(failure);
+          if (failure.peerId) {
+            const peer = this.connectedPeers.find((connectedPeer) =>
+              connectedPeer.id.equals(failure.peerId)
+            );
+            if (peer) {
+              log.info(`
+                Failed to send message to peer ${failure.peerId}.
+                Retrying the message with the same peer in the background.
+                If this fails, the peer will be renewed.
+                `);
+              void this.reliabilityMonitor.attemptRetriesOrRenew(
+                failure.peerId,
+                () => this.protocol.send(encoder, message, peer)
+              );
+            }
+          }
         }
       } else {
         log.error("Failed unexpectedly while sending:", result.reason);

packages/sdk/src/reliability_monitor/index.ts

@@ -6,12 +6,14 @@ import {
 } from "@waku/interfaces";
 
 import { ReceiverReliabilityMonitor } from "./receiver.js";
+import { SenderReliabilityMonitor } from "./sender.js";
 
 export class ReliabilityMonitorManager {
   private static receiverMonitors: Map<
     PubsubTopic,
     ReceiverReliabilityMonitor
   > = new Map();
+  private static senderMonitor: SenderReliabilityMonitor | undefined;
 
   public static createReceiverMonitor(
     pubsubTopic: PubsubTopic,
@@ -39,17 +41,30 @@ export class ReliabilityMonitorManager {
     return monitor;
   }
 
-  private constructor() {}
+  public static createSenderMonitor(
-
+    renewPeer: (peerId: PeerId) => Promise<Peer>
-  public static destroy(pubsubTopic: PubsubTopic): void {
+  ): SenderReliabilityMonitor {
-    this.receiverMonitors.delete(pubsubTopic);
+    if (!ReliabilityMonitorManager.senderMonitor) {
+      ReliabilityMonitorManager.senderMonitor = new SenderReliabilityMonitor(
+        renewPeer
+      );
+    }
+    return ReliabilityMonitorManager.senderMonitor;
   }
 
-  public static destroyAll(): void {
+  private constructor() {}
+
+  public static stop(pubsubTopic: PubsubTopic): void {
+    this.receiverMonitors.delete(pubsubTopic);
+    this.senderMonitor = undefined;
+  }
+
+  public static stopAll(): void {
     for (const [pubsubTopic, monitor] of this.receiverMonitors) {
       monitor.setMaxMissedMessagesThreshold(undefined);
       monitor.setMaxPingFailures(undefined);
       this.receiverMonitors.delete(pubsubTopic);
+      this.senderMonitor = undefined;
     }
   }
 }

packages/sdk/src/reliability_monitor/sender.ts

@@ -0,0 +1,57 @@
+import type { Peer, PeerId } from "@libp2p/interface";
+import { CoreProtocolResult, PeerIdStr } from "@waku/interfaces";
+import { Logger } from "@waku/utils";
+
+const log = new Logger("sdk:sender:reliability_monitor");
+
+const DEFAULT_MAX_ATTEMPTS_BEFORE_RENEWAL = 3;
+
+export class SenderReliabilityMonitor {
+  private attempts: Map<PeerIdStr, number> = new Map();
+  private readonly maxAttemptsBeforeRenewal =
+    DEFAULT_MAX_ATTEMPTS_BEFORE_RENEWAL;
+
+  public constructor(private renewPeer: (peerId: PeerId) => Promise<Peer>) {}
+
+  public async attemptRetriesOrRenew(
+    peerId: PeerId,
+    protocolSend: () => Promise<CoreProtocolResult>
+  ): Promise<void> {
+    const peerIdStr = peerId.toString();
+    const currentAttempts = this.attempts.get(peerIdStr) || 0;
+    this.attempts.set(peerIdStr, currentAttempts + 1);
+
+    if (currentAttempts + 1 < this.maxAttemptsBeforeRenewal) {
+      try {
+        const result = await protocolSend();
+        if (result.success) {
+          log.info(`Successfully sent message after retry to ${peerIdStr}`);
+          this.attempts.delete(peerIdStr);
+        } else {
+          log.error(
+            `Failed to send message after retry to ${peerIdStr}: ${result.failure}`
+          );
+          await this.attemptRetriesOrRenew(peerId, protocolSend);
+        }
+      } catch (error) {
+        log.error(
+          `Failed to send message after retry to ${peerIdStr}: ${error}`
+        );
+        await this.attemptRetriesOrRenew(peerId, protocolSend);
+      }
+    } else {
+      try {
+        const newPeer = await this.renewPeer(peerId);
+        log.info(
+          `Renewed peer ${peerId.toString()} to ${newPeer.id.toString()}`
+        );
+
+        this.attempts.delete(peerIdStr);
+        this.attempts.set(newPeer.id.toString(), 0);
+        await protocolSend();
+      } catch (error) {
+        log.error(`Failed to renew peer ${peerId.toString()}: ${error}`);
+      }
+    }
+  }
+}