fix: make the file writing to be idempotent

syncer/syncer.go

@@ -111,6 +111,7 @@ func (s *BlobSyncer) StartLoop() {
 		for range syncTicker.C {
 			if err = s.sync(); err != nil {
 				logging.Logger.Errorf("failed to sync, err=%s", err.Error())
+				time.Sleep(2 * time.Second)
 			}
 		}
 	}()
@@ -119,6 +120,7 @@ func (s *BlobSyncer) StartLoop() {
 		for range verifyTicket.C {
 			if err := s.verify(); err != nil {
 				logging.Logger.Errorf("failed to verify, err=%s", err.Error())
+				time.Sleep(2 * time.Second)
 			}
 		}
 	}()
@@ -197,27 +199,30 @@ func (s *BlobSyncer) sync() error {
 	if err != nil {
 		return err
 	}
-	var dbErr error
+
 	if isForkedBlock {
-		dbErr = s.blobDao.SaveBlockAndBlob(&db.Block{
+		err := s.blobDao.SaveBlockAndBlob(&db.Block{
 			Slot:       blockID,
 			BundleName: bundleName,
 		}, nil)
+		if err != nil {
+			logging.Logger.Errorf("failed to save block(h=%d) to DB, err=%s", blockID, err.Error())
+			return err
+		}
 	} else {
 		blockToSave, blobToSave, err := s.toBlockAndBlobs(block, sideCars, blockID, bundleName)
-		if err == nil {
-			err = s.blobDao.SaveBlockAndBlob(blockToSave, blobToSave)
-			if err == nil {
-				metrics.SyncedBlockIDGauge.Set(float64(blockID))
-				logging.Logger.Infof("saved block(block_id=%d) and blobs(num=%d) to DB \n", blockID, len(blobToSave))
-			}
+		if err != nil {
+			logging.Logger.Errorf("failed to convert to block and blobs, err=%s", err.Error())
+			return err
 		}
-		dbErr = err
-	}
-	if dbErr != nil {
-		logging.Logger.Errorf("failed to save block(h=%d) to DB, err=%s", blockID, dbErr.Error())
-		return dbErr
+		if err = s.blobDao.SaveBlockAndBlob(blockToSave, blobToSave); err != nil {
+			logging.Logger.Errorf("failed to save block(h=%d) to DB, err=%s", blockID, err.Error())
+			return err
+		}
+		logging.Logger.Infof("saved block(block_id=%d) and blobs(num=%d) to DB \n", blockID, len(blobToSave))
 	}
+	metrics.SyncedBlockIDGauge.Set(float64(blockID))
+	// update the block status to processed
 	if blockID == s.bundleDetail.finalizeBlockID {
 		// init next bundle
 		startBlockID := blockID + 1
@@ -240,12 +245,18 @@ func (s *BlobSyncer) process(bundleName string, blockID uint64, sidecars []*type
 			return err
 		}
 	}
-	if err = s.writeBlobToFile(blockID, bundleName, sidecars); err != nil {
-		return err
+	// for idempotent
+	_, err = os.Stat(s.getBundleDir(bundleName))
+	if !os.IsNotExist(err) {
+		if err = s.writeBlobToFile(blockID, bundleName, sidecars); err != nil {
+			return err
+		}
 	}
 	if blockID == s.bundleDetail.finalizeBlockID {
+		// this is idempotent
 		err = s.finalizeCurBundle(bundleName)
 		if err != nil {
+			logging.Logger.Errorf("failed to finalize bundle, bundle=%s, err=%s", bundleName, err.Error())
 			return err
 		}
 		logging.Logger.Infof("finalized bundle, bundle_name=%s, bucket_name=%s\n", bundleName, s.getBucketName())
@@ -298,14 +309,8 @@ func (s *BlobSyncer) finalizeBundle(bundleName, bundleDir, bundleFilePath string
 			return err
 		}
 	}
-	err = os.RemoveAll(bundleDir)
-	if err != nil {
-		return err
-	}
-	err = os.Remove(bundleFilePath)
-	if err != nil && !os.IsNotExist(err) {
-		return err
-	}
+	os.RemoveAll(bundleDir)
+	os.Remove(bundleFilePath)
 	return s.blobDao.UpdateBundleStatus(bundleName, db.Finalized)
 }
 
@@ -395,7 +400,9 @@ func (s *BlobSyncer) toBlockAndBlobs(blockResp *structs.GetBlockV2Response, side
 	blobsReturn := make([]*db.Blob, 0)
 
 	populateBlobTxDetails := func(blockNum uint64) error {
-		elBlock, err := s.client.BlockByNumber(context.Background(), big.NewInt(int64(blockNum)))
+		ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout)
+		defer cancel()
+		elBlock, err := s.client.BlockByNumber(ctx, big.NewInt(int64(blockNum)))
 		if err != nil {
 			return fmt.Errorf("failed to get block at height %d, err=%s", blockNum, err.Error())
 		}
@@ -415,7 +422,9 @@ func (s *BlobSyncer) toBlockAndBlobs(blockResp *structs.GetBlockV2Response, side
 
 	switch {
 	case s.BSCChain():
-		header, err := s.client.GetBlockHeader(context.Background(), blockNumOrSlot)
+		ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout)
+		defer cancel()
+		header, err := s.client.GetBlockHeader(ctx, blockNumOrSlot)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -538,7 +547,9 @@ func (s *BlobSyncer) ETHChain() bool {
 
 func (s *BlobSyncer) GetParams() (*cmn.VersionedParams, error) {
 	if s.params == nil {
-		params, err := s.chainClient.GetParams(context.Background())
+		ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout)
+		defer cancel()
+		params, err := s.chainClient.GetParams(ctx)
 		if err != nil {
 			logging.Logger.Errorf("failed to get params, err=%s", err.Error())
 			return nil, err