fix(audit): Remove Task data from aggregator after a response has bee…

…n responded or expires. (#1004)

Co-authored-by: Uriel Mihura <[email protected]>
Co-authored-by: Mario Rugiero <[email protected]>

aggregator/cmd/main.go

@@ -49,6 +49,15 @@ func aggregatorMain(ctx *cli.Context) error {
 		return err
 	}
 
+	// Supervisor revives garbage collector
+	go func() {
+		for {
+			log.Println("Starting Garbage collector")
+			aggregator.ClearTasksFromMaps()
+			log.Println("Garbage collector panicked, Supervisor restarting")
+		}
+	}()
+
 	// Listen for new task created in the ServiceManager contract in a separate goroutine, both V1 and V2 subscriptions:
 	go func() {
 		listenErr := aggregator.SubscribeToNewTasks()

aggregator/internal/pkg/aggregator.go

@@ -60,7 +60,7 @@ type Aggregator struct {
 	// and can start from zero
 	batchesIdxByIdentifierHash map[[32]byte]uint32
 
-	// Stores the taskCreatedBlock for each batch bt batch index
+	// Stores the taskCreatedBlock for each batch by batch index
 	batchCreatedBlockByIdx map[uint32]uint64
 
 	// Stores the TaskResponse for each batch by batchIdentifierHash
@@ -215,6 +215,8 @@ func (agg *Aggregator) Start(ctx context.Context) error {
 
 const MaxSentTxRetries = 5
 
+const BLS_AGG_SERVICE_TIMEOUT = 100 * time.Second
+
 func (agg *Aggregator) handleBlsAggServiceResponse(blsAggServiceResp blsagg.BlsAggregationServiceResponse) {
 	agg.taskMutex.Lock()
 	agg.AggregatorConfig.BaseConfig.Logger.Info("- Locked Resources: Fetching task data")
@@ -275,6 +277,7 @@ func (agg *Aggregator) handleBlsAggServiceResponse(blsAggServiceResp blsagg.BlsA
 			agg.logger.Info("Aggregator successfully responded to task",
 				"taskIndex", blsAggServiceResp.TaskIndex,
 				"batchIdentifierHash", "0x"+hex.EncodeToString(batchIdentifierHash[:]))
+
 			return
 		}
 
@@ -361,12 +364,17 @@ func (agg *Aggregator) AddNewTask(batchMerkleRoot [32]byte, senderAddress [20]by
 		BatchMerkleRoot: batchMerkleRoot,
 		SenderAddress:   senderAddress,
 	}
+	agg.logger.Info(
+		"Task Info added in aggregator:",
+		"Task", batchIndex,
+		"batchIdentifierHash", batchIdentifierHash,
+	)
 	agg.nextBatchIndex += 1
 
 	quorumNums := eigentypes.QuorumNums{eigentypes.QuorumNum(QUORUM_NUMBER)}
 	quorumThresholdPercentages := eigentypes.QuorumThresholdPercentages{eigentypes.QuorumThresholdPercentage(QUORUM_THRESHOLD)}
 
-	err := agg.blsAggregationService.InitializeNewTask(batchIndex, taskCreatedBlock, quorumNums, quorumThresholdPercentages, 100*time.Second)
+	err := agg.blsAggregationService.InitializeNewTask(batchIndex, taskCreatedBlock, quorumNums, quorumThresholdPercentages, BLS_AGG_SERVICE_TIMEOUT)
 	// FIXME(marian): When this errors, should we retry initializing new task? Logging fatal for now.
 	if err != nil {
 		agg.logger.Fatalf("BLS aggregation service error when initializing new task: %s", err)
@@ -377,3 +385,51 @@ func (agg *Aggregator) AddNewTask(batchMerkleRoot [32]byte, senderAddress [20]by
 	agg.AggregatorConfig.BaseConfig.Logger.Info("- Unlocked Resources: Adding new task")
 	agg.logger.Info("New task added", "batchIndex", batchIndex, "batchIdentifierHash", "0x"+hex.EncodeToString(batchIdentifierHash[:]))
 }
+
+// Long-lived goroutine that periodically checks and removes old Tasks from stored Maps
+// It runs every GarbageCollectorPeriod and removes all tasks older than GarbageCollectorTasksAge
+// This was added because each task occupies memory in the maps, and we need to free it to avoid a memory leak
+func (agg *Aggregator) ClearTasksFromMaps() {
+	defer func() {
+		err := recover() //stops panics
+		if err != nil {
+			agg.logger.Error("Recovered from panic", "err", err)
+		}
+	}()
+
+	agg.AggregatorConfig.BaseConfig.Logger.Info(fmt.Sprintf("- Removing finalized Task Infos from Maps every %v", agg.AggregatorConfig.Aggregator.GarbageCollectorPeriod))
+	lastIdxDeleted := uint32(0)
+
+	for {
+		time.Sleep(agg.AggregatorConfig.Aggregator.GarbageCollectorPeriod)
+
+		agg.AggregatorConfig.BaseConfig.Logger.Info("Cleaning finalized tasks from maps")
+		oldTaskIdHash, err := agg.avsReader.GetOldTaskHash(agg.AggregatorConfig.Aggregator.GarbageCollectorTasksAge, agg.AggregatorConfig.Aggregator.GarbageCollectorTasksInterval)
+		if err != nil {
+			agg.logger.Error("Error getting old task hash, skipping this garbage collect", "err", err)
+			continue // Retry in the next iteration
+		}
+		if oldTaskIdHash == nil {
+			agg.logger.Warn("No old tasks found")
+			continue // Retry in the next iteration
+		}
+
+		taskIdxToDelete := agg.batchesIdxByIdentifierHash[*oldTaskIdHash]
+		agg.logger.Info("Old task found", "taskIndex", taskIdxToDelete)
+		// delete from lastIdxDeleted to taskIdxToDelete
+		for i := lastIdxDeleted + 1; i <= taskIdxToDelete; i++ {
+			batchIdentifierHash, exists := agg.batchesIdentifierHashByIdx[i]
+			if exists {
+				agg.logger.Info("Cleaning up finalized task", "taskIndex", i)
+				delete(agg.batchesIdxByIdentifierHash, batchIdentifierHash)
+				delete(agg.batchCreatedBlockByIdx, i)
+				delete(agg.batchesIdentifierHashByIdx, i)
+				delete(agg.batchDataByIdentifierHash, batchIdentifierHash)
+			} else {
+				agg.logger.Warn("Task not found in maps", "taskIndex", i)
+			}
+		}
+		lastIdxDeleted = taskIdxToDelete
+		agg.AggregatorConfig.BaseConfig.Logger.Info("Done cleaning finalized tasks from maps")
+	}
+}