cli: update upload-bin to create index files during block uploading

Close #3655
Close #3652

Signed-off-by: Ekaterina Pavlova <ekt@morphbits.io>

cli/util/convert.go

@@ -86,10 +86,6 @@ func NewCommands() []*cli.Command {
 			Usage: "Number of concurrent searches for blocks",
 			Value: 20,
 		},
-		&cli.BoolFlag{
-			Name:  "skip-blocks-uploading",
-			Usage: "Skip blocks uploading and upload only index files",
-		},
 		&cli.UintFlag{
 			Name:  "retries",
 			Usage: "Maximum number of Neo/NeoFS node request retries",
@@ -184,7 +180,7 @@ func NewCommands() []*cli.Command {
 				{
 					Name:      "upload-bin",
 					Usage:     "Fetch blocks from RPC node and upload them to the NeoFS container",
-					UsageText: "neo-go util upload-bin --fs-rpc-endpoint <address1>[,<address2>[...]] --container <cid> --block-attribute block --index-attribute index --rpc-endpoint <node> [--timeout <time>] --wallet <wallet> [--wallet-config <config>] [--address <address>] [--workers <num>] [--searchers <num>] [--index-file-size <size>] [--skip-blocks-uploading] [--retries <num>] [--debug]",
+					UsageText: "neo-go util upload-bin --fs-rpc-endpoint <address1>[,<address2>[...]] --container <cid> --block-attribute block --index-attribute index --rpc-endpoint <node> [--timeout <time>] --wallet <wallet> [--wallet-config <config>] [--address <address>] [--workers <num>] [--searchers <num>] [--index-file-size <size>] [--retries <num>] [--debug]",
 					Action:    uploadBin,
 					Flags:     uploadBinFlags,
 				},

cli/util/upload_bin.go

@@ -12,7 +12,6 @@ import (
 	"github.com/nspcc-dev/neo-go/cli/cmdargs"
 	"github.com/nspcc-dev/neo-go/cli/options"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
 	"github.com/nspcc-dev/neo-go/pkg/services/oracle/neofs"
@@ -32,12 +31,11 @@ import (
 )
 
 const (
-	// Number of objects to upload in a batch. All batches of uploadBatchSize size
+	// Number of objects to search in a batch. We need to search with EQ filter to
-	// except the most recent one are guaranteed to be completed and don't contain gaps.
+	// avoid partially-completed SEARCH responses. If EQ search haven't found object
-	uploadBatchSize = 10000
+	// the object will be uploaded one more time which may lead to duplicating objects.
-	// Number of objects to search in a batch. If it is larger than uploadBatchSize,
+	// We will have a risk of duplicates until #3645 is resolved (NeoFS guarantees
-	// it may lead to many duplicate uploads. We need to search with EQ filter to
+	// search results).
-	// avoid partially-completed SEARCH responses.
 	searchBatchSize = 1
 	// Size of object ID.
 	oidSize = sha256.Size
@@ -79,10 +77,12 @@ func uploadBin(ctx *cli.Context) error {
 	rpcNeoFS := ctx.StringSlice("fs-rpc-endpoint")
 	containerIDStr := ctx.String("container")
 	attr := ctx.String("block-attribute")
-	numWorkers := ctx.Int("workers")
+	numWorkers := ctx.Uint("workers")
-	maxParallelSearches := ctx.Int("searchers")
+	maxParallelSearches := ctx.Uint("searchers")
-	maxRetries := int(ctx.Uint("retries"))
+	maxRetries := ctx.Uint("retries")
 	debug := ctx.Bool("debug")
+	indexFileSize := ctx.Uint("index-file-size")
+	indexAttrKey := ctx.String("index-attribute")
 	acc, _, err := options.GetAccFromContext(ctx)
 	if err != nil {
 		return cli.Exit(fmt.Sprintf("failed to load account: %v", err), 1)
@@ -151,30 +151,20 @@ func uploadBin(ctx *cli.Context) error {
 		return cli.Exit(fmt.Sprintf("failed to get current block height from RPC: %v", err), 1)
 	}
 	fmt.Fprintln(ctx.App.Writer, "Chain block height:", currentBlockHeight)
-
+	i, buf, err := searchIndexFile(ctx, pWrapper, containerID, acc, signer, indexFileSize, attr, indexAttrKey, maxParallelSearches, maxRetries)
-	oldestMissingBlockIndex, errBlock := fetchLatestMissingBlockIndex(ctx.Context, p, containerID, acc.PrivateKey(), attr, int(currentBlockHeight), maxParallelSearches, maxRetries)
-	if errBlock != nil {
-		return cli.Exit(fmt.Errorf("failed to fetch the oldest missing block index from container: %w", errBlock), 1)
-	}
-	fmt.Fprintln(ctx.App.Writer, "First block of latest incomplete batch uploaded to NeoFS container:", oldestMissingBlockIndex)
-
-	if !ctx.Bool("skip-blocks-uploading") {
-		err = uploadBlocks(ctx, pWrapper, rpc, signer, containerID, acc, attr, oldestMissingBlockIndex, uint(currentBlockHeight), homomorphicHashingDisabled, numWorkers, maxRetries, debug)
-		if err != nil {
-			return cli.Exit(fmt.Errorf("failed to upload blocks: %w", err), 1)
-		}
-		oldestMissingBlockIndex = int(currentBlockHeight) + 1
-	}
-
-	err = uploadIndexFiles(ctx, pWrapper, containerID, acc, signer, uint(oldestMissingBlockIndex), attr, homomorphicHashingDisabled, maxParallelSearches, maxRetries, debug)
 	if err != nil {
-		return cli.Exit(fmt.Errorf("failed to upload index files: %w", err), 1)
+		return cli.Exit(fmt.Errorf("failed to find objects: %w", err), 1)
+	}
+
+	err = uploadBlocksAndIndexFiles(ctx, pWrapper, rpc, signer, containerID, acc, attr, indexAttrKey, buf, i, indexFileSize, uint(currentBlockHeight), homomorphicHashingDisabled, numWorkers, maxRetries, debug)
+	if err != nil {
+		return cli.Exit(fmt.Errorf("failed to upload objects: %w", err), 1)
 	}
 	return nil
 }
 
 // retry function with exponential backoff.
-func retry(action func() error, maxRetries int) error {
+func retry(action func() error, maxRetries uint) error {
 	var err error
 	backoff := initialBackoff
 	for range maxRetries {
@@ -190,98 +180,33 @@ func retry(action func() error, maxRetries int) error {
 	return err // Return the last error after exhausting retries.
 }
 
-type searchResult struct {
+// uploadBlocksAndIndexFiles uploads the blocks and index files to the container using the pool.
-	startIndex int
+func uploadBlocksAndIndexFiles(ctx *cli.Context, p poolWrapper, rpc *rpcclient.Client, signer user.Signer, containerID cid.ID, acc *wallet.Account, attr, indexAttributeKey string, buf []byte, currentIndexFileID, indexFileSize, currentBlockHeight uint, homomorphicHashingDisabled bool, numWorkers, maxRetries uint, debug bool) error {
-	endIndex   int
+	if currentIndexFileID*indexFileSize >= currentBlockHeight {
-	numOIDs    int
+		fmt.Fprintf(ctx.App.Writer, "No new blocks to upload. Need to upload starting from %d, current height %d\n", currentIndexFileID*indexFileSize, currentBlockHeight)
-	err        error
-}
-
-// fetchLatestMissingBlockIndex searches the container for the latest full batch of blocks
-// starting from the currentHeight and going backwards. It returns the index of first block
-// in the next batch.
-func fetchLatestMissingBlockIndex(ctx context.Context, p *pool.Pool, containerID cid.ID, priv *keys.PrivateKey, attributeKey string, currentHeight int, maxParallelSearches, maxRetries int) (int, error) {
-	var (
-		wg              sync.WaitGroup
-		numBatches      = currentHeight / searchBatchSize
-		emptyBatchFound bool
-		pWrapper        = poolWrapper{p}
-	)
-
-	for batch := numBatches; batch > -maxParallelSearches; batch -= maxParallelSearches {
-		results := make([]searchResult, maxParallelSearches)
-
-		for i := range maxParallelSearches {
-			startIndex := (batch + i) * searchBatchSize
-			endIndex := startIndex + searchBatchSize
-			if endIndex <= 0 {
-				continue
-			}
-			if startIndex < 0 {
-				startIndex = 0
-			}
-
-			wg.Add(1)
-			go func(i, startIndex, endIndex int) {
-				defer wg.Done()
-
-				prm := client.PrmObjectSearch{}
-				filters := object.NewSearchFilters()
-				if endIndex == startIndex+1 {
-					filters.AddFilter(attributeKey, fmt.Sprintf("%d", startIndex), object.MatchStringEqual)
-				} else {
-					filters.AddFilter(attributeKey, fmt.Sprintf("%d", startIndex), object.MatchNumGE)
-					filters.AddFilter(attributeKey, fmt.Sprintf("%d", endIndex), object.MatchNumLT)
-				}
-				prm.SetFilters(filters)
-				var (
-					objectIDs []oid.ID
-					err       error
-				)
-				err = retry(func() error {
-					objectIDs, err = neofs.ObjectSearch(ctx, pWrapper, priv, containerID.String(), prm)
-					return err
-				}, maxRetries)
-				results[i] = searchResult{startIndex: startIndex, endIndex: endIndex, numOIDs: len(objectIDs), err: err}
-			}(i, startIndex, endIndex)
-		}
-		wg.Wait()
-
-		for i := len(results) - 1; i >= 0; i-- {
-			if results[i].err != nil {
-				return 0, fmt.Errorf("blocks search failed for batch with indexes from %d to %d: %w", results[i].startIndex, results[i].endIndex-1, results[i].err)
-			}
-			if results[i].numOIDs == 0 {
-				emptyBatchFound = true
-				continue
-			}
-			if emptyBatchFound || (batch == numBatches && i == len(results)-1) {
-				return results[i].startIndex / uploadBatchSize * uploadBatchSize, nil
-			}
-		}
-	}
-	return 0, nil
-}
-
-// uploadBlocks uploads the blocks to the container using the pool.
-func uploadBlocks(ctx *cli.Context, p poolWrapper, rpc *rpcclient.Client, signer user.Signer, containerID cid.ID, acc *wallet.Account, attr string, oldestMissingBlockIndex int, currentBlockHeight uint, homomorphicHashingDisabled bool, numWorkers, maxRetries int, debug bool) error {
-	if oldestMissingBlockIndex > int(currentBlockHeight) {
-		fmt.Fprintf(ctx.App.Writer, "No new blocks to upload. Need to upload starting from %d, current height %d\n", oldestMissingBlockIndex, currentBlockHeight)
 		return nil
 	}
-	for batchStart := oldestMissingBlockIndex; batchStart <= int(currentBlockHeight); batchStart += uploadBatchSize {
+	fmt.Fprintln(ctx.App.Writer, "Uploading blocks and index files...")
+	for indexFileStart := currentIndexFileID * indexFileSize; indexFileStart < currentBlockHeight; indexFileStart += indexFileSize {
 		var (
-			batchEnd = min(batchStart+uploadBatchSize, int(currentBlockHeight)+1)
+			indexFileEnd = min(indexFileStart+indexFileSize, currentBlockHeight)
-			errCh    = make(chan error)
+			errCh        = make(chan error)
-			doneCh   = make(chan struct{})
+			doneCh       = make(chan struct{})
-			wg       sync.WaitGroup
+			wg           sync.WaitGroup
+			emptyOID     = make([]byte, oidSize)
 		)
-		fmt.Fprintf(ctx.App.Writer, "Processing batch from %d to %d\n", batchStart, batchEnd-1)
+		fmt.Fprintf(ctx.App.Writer, "Processing batch from %d to %d\n", indexFileStart, indexFileEnd-1)
-		wg.Add(numWorkers)
+		wg.Add(int(numWorkers))
 		for i := range numWorkers {
-			go func(i int) {
+			go func(i uint) {
 				defer wg.Done()
-				for blockIndex := batchStart + i; blockIndex < batchEnd; blockIndex += numWorkers {
+				for blockIndex := indexFileStart + i; blockIndex < indexFileEnd; blockIndex += numWorkers {
+					if slices.Compare(buf[blockIndex%indexFileSize*oidSize:blockIndex%indexFileSize*oidSize+oidSize], emptyOID) != 0 {
+						if debug {
+							fmt.Fprintf(ctx.App.Writer, "Block %d is already uploaded\n", blockIndex)
+						}
+						continue
+					}
 					var blk *block.Block
 					errGet := retry(func() error {
 						var errGetBlock error
@@ -316,9 +241,13 @@ func uploadBlocks(ctx *cli.Context, p poolWrapper, rpc *rpcclient.Client, signer
 						*object.NewAttribute("Timestamp", strconv.FormatUint(blk.Timestamp, 10)),
 					}
 
-					objBytes := bw.Bytes()
+					var (
+						objBytes = bw.Bytes()
+						resOid   oid.ID
+					)
 					errRetr := retry(func() error {
-						resOid, errUpload := uploadObj(ctx.Context, p, signer, acc.PrivateKey().GetScriptHash(), containerID, objBytes, attrs, homomorphicHashingDisabled)
+						var errUpload error
+						resOid, errUpload = uploadObj(ctx.Context, p, signer, acc.PrivateKey().GetScriptHash(), containerID, objBytes, attrs, homomorphicHashingDisabled)
 						if errUpload != nil {
 							return errUpload
 						}
@@ -334,6 +263,7 @@ func uploadBlocks(ctx *cli.Context, p poolWrapper, rpc *rpcclient.Client, signer
 						}
 						return
 					}
+					resOid.Encode(buf[blockIndex%indexFileSize*oidSize:])
 				}
 			}(i)
 		}
@@ -348,195 +278,151 @@ func uploadBlocks(ctx *cli.Context, p poolWrapper, rpc *rpcclient.Client, signer
 			return fmt.Errorf("upload error: %w", err)
 		case <-doneCh:
 		}
+		fmt.Fprintf(ctx.App.Writer, "Successfully processed batch of blocks: from %d to %d\n", indexFileStart, indexFileEnd-1)
 
-		fmt.Fprintf(ctx.App.Writer, "Successfully uploaded batch of blocks: from %d to %d\n", batchStart, batchEnd-1)
+		// Additional check for empty OIDs in the buffer.
+		for k := uint(0); k < (indexFileEnd-indexFileStart)*oidSize; k += oidSize {
+			if slices.Compare(buf[k:k+oidSize], emptyOID) == 0 {
+				return fmt.Errorf("empty OID found in index file %d at position %d (block index %d)", indexFileStart/indexFileSize, k/oidSize, indexFileStart/indexFileSize*indexFileSize+k/oidSize)
+			}
+		}
+		if indexFileEnd-indexFileStart == indexFileSize {
+			attrs := []object.Attribute{
+				*object.NewAttribute(indexAttributeKey, strconv.Itoa(int(indexFileStart/indexFileSize))),
+				*object.NewAttribute("IndexSize", strconv.Itoa(int(indexFileSize))),
+			}
+			err := retry(func() error {
+				var errUpload error
+				_, errUpload = uploadObj(ctx.Context, p, signer, acc.PrivateKey().GetScriptHash(), containerID, buf, attrs, homomorphicHashingDisabled)
+				return errUpload
+			}, maxRetries)
+			if err != nil {
+				return fmt.Errorf("failed to upload index file: %w", err)
+			}
+			fmt.Println("Successfully uploaded index file ", indexFileStart/indexFileSize)
+		}
+		clear(buf)
 	}
 	return nil
 }
 
-// uploadIndexFiles uploads missing index files to the container.
+// searchIndexFile returns the ID and buffer for the next index file to be uploaded.
-func uploadIndexFiles(ctx *cli.Context, p poolWrapper, containerID cid.ID, account *wallet.Account, signer user.Signer, oldestMissingBlockIndex uint, blockAttributeKey string, homomorphicHashingDisabled bool, maxParallelSearches, maxRetries int, debug bool) error {
+func searchIndexFile(ctx *cli.Context, p poolWrapper, containerID cid.ID, account *wallet.Account, signer user.Signer, indexFileSize uint, blockAttributeKey, attributeKey string, maxParallelSearches, maxRetries uint) (uint, []byte, error) {
 	var (
-		attributeKey  = ctx.String("index-attribute")
+		// buf is used to store OIDs of the uploaded blocks.
-		indexFileSize = ctx.Uint("index-file-size")
+		buf    = make([]byte, indexFileSize*oidSize)
+		doneCh = make(chan struct{})
+		errCh  = make(chan error)
 
-		buffer   = make([]byte, indexFileSize*oidSize)
-		doneCh   = make(chan struct{})
-		errCh    = make(chan error)
-		emptyOid = make([]byte, oidSize)
-
-		expectedIndexCount = (oldestMissingBlockIndex - 1) / indexFileSize
 		existingIndexCount = uint(0)
 		filters            = object.NewSearchFilters()
 	)
-	fmt.Fprintln(ctx.App.Writer, "Uploading index files...")
-
 	go func() {
 		defer close(doneCh)
 		// Search for existing index files.
 		filters.AddFilter("IndexSize", fmt.Sprintf("%d", indexFileSize), object.MatchStringEqual)
-		indexIDs := searchObjects(ctx.Context, p, containerID, account, attributeKey, 0, expectedIndexCount, maxParallelSearches, maxRetries, errCh, filters)
+		for i := 0; ; i++ {
-		for range indexIDs {
+			indexIDs := searchObjects(ctx.Context, p, containerID, account, attributeKey, uint(i), uint(i+1), 1, maxRetries, errCh, filters)
-			existingIndexCount++
+			count := 0
-		}
+			for range indexIDs {
-
+				count++
-		if existingIndexCount >= expectedIndexCount {
+				if count > 1 {
-			fmt.Fprintf(ctx.App.Writer, "Index files are up to date. Existing: %d, expected: %d\n", existingIndexCount, expectedIndexCount)
-			return
-		}
-		fmt.Fprintf(ctx.App.Writer, "Current index files count: %d, expected: %d\n", existingIndexCount, expectedIndexCount)
-
-		// Main processing loop for each index file.
-		for i := existingIndexCount; i < expectedIndexCount; i++ {
-			// Start block parsing goroutines.
-			var (
-				// processedIndices is a mapping from position in buffer to the block index.
-				processedIndices sync.Map
-				wg               sync.WaitGroup
-				oidCh            = make(chan oid.ID, 2*maxParallelSearches)
-			)
-			wg.Add(maxParallelSearches)
-			for range maxParallelSearches {
-				go func() {
-					defer wg.Done()
-					for id := range oidCh {
-						var obj object.Object
-						errRetr := retry(func() error {
-							var errGet error
-							obj, _, errGet = p.ObjectGetInit(ctx.Context, containerID, id, signer, client.PrmObjectGet{})
-							return errGet
-						}, maxRetries)
-						if errRetr != nil {
-							select {
-							case errCh <- fmt.Errorf("failed to fetch object %s: %w", id.String(), errRetr):
-							default:
-							}
-							return
-						}
-						blockIndex, err := getBlockIndex(obj, blockAttributeKey)
-						if err != nil {
-							select {
-							case errCh <- fmt.Errorf("failed to get block index from object %s: %w", id.String(), err):
-							default:
-							}
-							return
-						}
-						pos := uint(blockIndex) % indexFileSize
-						if _, ok := processedIndices.LoadOrStore(pos, blockIndex); !ok {
-							id.Encode(buffer[pos*oidSize:])
-						}
-					}
-				}()
-			}
-
-			// Search for blocks within the index file range.
-			startIndex := i * indexFileSize
-			endIndex := startIndex + indexFileSize
-			objIDs := searchObjects(ctx.Context, p, containerID, account, blockAttributeKey, startIndex, endIndex, maxParallelSearches, maxRetries, errCh)
-			for id := range objIDs {
-				oidCh <- id
-			}
-			close(oidCh)
-			wg.Wait()
-			fmt.Fprintf(ctx.App.Writer, "Index file %d generated, checking for the missing blocks...\n", i)
-
-			// Check if there are empty OIDs in the generated index file. This may happen
-			// if searchObjects has returned not all blocks within the requested range, ref.
-			// #3645. In this case, retry the search for every missing object.
-			var count int
-			for idx := range indexFileSize {
-				if _, ok := processedIndices.Load(idx); !ok {
-					count++
-					fmt.Fprintf(ctx.App.Writer, "Index file %d: fetching missing block %d\n", i, i*indexFileSize+idx)
-					objIDs = searchObjects(ctx.Context, p, containerID, account, blockAttributeKey, i*indexFileSize+idx, i*indexFileSize+idx+1, 1, maxRetries, errCh)
-					// Block object duplicates are allowed, we're OK with the first found result.
-					id, ok := <-objIDs
-					for range objIDs {
-					}
-					if !ok {
-						select {
-						case errCh <- fmt.Errorf("index file %d: block %d is missing from the storage", i, i*indexFileSize+idx):
-						default:
-						}
-						return
-					}
-					processedIndices.Store(idx, id)
-					id.Encode(buffer[idx*oidSize:])
-				}
-			}
-			fmt.Fprintf(ctx.App.Writer, "%d missing block(s) processed for index file %d, uploading index file...\n", count, i)
-
-			// Check if there are empty OIDs in the generated index file. If it happens at
-			// this stage, then there's a bug in the code.
-			for k := 0; k < len(buffer); k += oidSize {
-				if slices.Compare(buffer[k:k+oidSize], emptyOid) == 0 {
 					select {
-					case errCh <- fmt.Errorf("empty OID found in index file %d at position %d (block index %d)", i, k/oidSize, i*indexFileSize+uint(k/oidSize)):
+					case errCh <- fmt.Errorf("duplicated index file %d found", i):
 					default:
 					}
 					return
 				}
 			}
-
+			if count == 0 {
-			// Upload index file.
+				break
-			attrs := []object.Attribute{
-				*object.NewAttribute(attributeKey, strconv.Itoa(int(i))),
-				*object.NewAttribute("IndexSize", strconv.Itoa(int(indexFileSize))),
 			}
-			err := retry(func() error {
+			existingIndexCount++
-				resOid, errUpload := uploadObj(ctx.Context, p, signer, account.PrivateKey().GetScriptHash(), containerID, buffer, attrs, homomorphicHashingDisabled)
-				if errUpload != nil {
-					return errUpload
-				}
-				if debug {
-					fmt.Fprintf(ctx.App.Writer, "Uploaded idex file %d with object ID: %s\n", i, resOid.String())
-				}
-				return errUpload
-			}, maxRetries)
-			if err != nil {
-				select {
-				case errCh <- fmt.Errorf("failed to upload index file %d: %w", i, err):
-				default:
-				}
-				return
-			}
-			fmt.Fprintf(ctx.App.Writer, "Uploaded index file %d\n", i)
-			clear(buffer)
 		}
+		fmt.Fprintf(ctx.App.Writer, "Current index files count: %d\n", existingIndexCount)
+
+		// Start block parsing goroutines.
+		var (
+			// processedIndices is a mapping from position in buffer to the block index.
+			// It prevents duplicates.
+			processedIndices sync.Map
+			wg               sync.WaitGroup
+			oidCh            = make(chan oid.ID, 2*maxParallelSearches)
+		)
+		wg.Add(int(maxParallelSearches))
+		for range maxParallelSearches {
+			go func() {
+				defer wg.Done()
+				for id := range oidCh {
+					var obj object.Object
+					errRetr := retry(func() error {
+						var errGet error
+						obj, _, errGet = p.ObjectGetInit(ctx.Context, containerID, id, signer, client.PrmObjectGet{})
+						return errGet
+					}, maxRetries)
+					if errRetr != nil {
+						select {
+						case errCh <- fmt.Errorf("failed to fetch object %s: %w", id.String(), errRetr):
+						default:
+						}
+						return
+					}
+					blockIndex, err := getBlockIndex(obj, blockAttributeKey)
+					if err != nil {
+						select {
+						case errCh <- fmt.Errorf("failed to get block index from object %s: %w", id.String(), err):
+						default:
+						}
+						return
+					}
+					pos := uint(blockIndex) % indexFileSize
+					if _, ok := processedIndices.LoadOrStore(pos, blockIndex); !ok {
+						id.Encode(buf[pos*oidSize:])
+					}
+				}
+			}()
+		}
+
+		// Search for blocks within the index file range.
+		objIDs := searchObjects(ctx.Context, p, containerID, account, blockAttributeKey, existingIndexCount*indexFileSize, (existingIndexCount+1)*indexFileSize, maxParallelSearches, maxRetries, errCh)
+		for id := range objIDs {
+			oidCh <- id
+		}
+		close(oidCh)
+		wg.Wait()
 	}()
 
 	select {
 	case err := <-errCh:
-		return err
+		return existingIndexCount, nil, err
 	case <-doneCh:
+		return existingIndexCount, buf, nil
 	}
-
-	return nil
 }
 
 // searchObjects searches in parallel for objects with attribute GE startIndex and LT
 // endIndex. It returns a buffered channel of resulting object IDs and closes it once
 // OID search is finished. Errors are sent to errCh in a non-blocking way.
-func searchObjects(ctx context.Context, p poolWrapper, containerID cid.ID, account *wallet.Account, blockAttributeKey string, startIndex, endIndex uint, maxParallelSearches, maxRetries int, errCh chan error, additionalFilters ...object.SearchFilters) chan oid.ID {
+func searchObjects(ctx context.Context, p poolWrapper, containerID cid.ID, account *wallet.Account, blockAttributeKey string, startIndex, endIndex, maxParallelSearches, maxRetries uint, errCh chan error, additionalFilters ...object.SearchFilters) chan oid.ID {
 	var res = make(chan oid.ID, 2*searchBatchSize)
 	go func() {
 		var wg sync.WaitGroup
 		defer close(res)
 
-		for i := int(startIndex); i < int(endIndex); i += searchBatchSize * maxParallelSearches {
+		for i := startIndex; i < endIndex; i += searchBatchSize * maxParallelSearches {
 			for j := range maxParallelSearches {
 				start := i + j*searchBatchSize
 				end := start + searchBatchSize
 
-				if start >= int(endIndex) {
+				if start >= endIndex {
 					break
 				}
-				if end > int(endIndex) {
+				if end > endIndex {
-					end = int(endIndex)
+					end = endIndex
 				}
 
 				wg.Add(1)
-				go func(start, end int) {
+				go func(start, end uint) {
 					defer wg.Done()
 
 					prm := client.PrmObjectSearch{}

docs/neofs-blockstorage.md

@@ -85,7 +85,7 @@ NAME:
 neo-go util upload-bin - Fetch blocks from RPC node and upload them to the NeoFS container
 
 USAGE:
-neo-go util upload-bin --fs-rpc-endpoint <address1>[,<address2>[...]] --container <cid> --block-attribute block --index-attribute index --rpc-endpoint <node> [--timeout <time>] --wallet <wallet> [--wallet-config <config>] [--address <address>] [--workers <num>] [--searchers <num>] [--index-file-size <size>] [--skip-blocks-uploading] [--retries <num>] [--debug]
+neo-go util upload-bin --fs-rpc-endpoint <address1>[,<address2>[...]] --container <cid> --block-attribute block --index-attribute index --rpc-endpoint <node> [--timeout <time>] --wallet <wallet> [--wallet-config <config>] [--address <address>] [--workers <num>] [--searchers <num>] [--index-file-size <size>] [--retries <num>] [--debug]
 
 OPTIONS:
 --fs-rpc-endpoint value, --fsr value [ --fs-rpc-endpoint value, --fsr value ]  List of NeoFS storage node RPC addresses (comma-separated or multiple --fs-rpc-endpoint flags)
@@ -96,7 +96,6 @@ OPTIONS:
 --index-file-size value                                                        Size of index file (default: 128000)
 --workers value                                                                Number of workers to fetch, upload and search blocks concurrently (default: 50)
 --searchers value                                                              Number of concurrent searches for blocks (default: 20)
---skip-blocks-uploading                                                        Skip blocks uploading and upload only index files (default: false)
 --retries value                                                                Maximum number of Neo/NeoFS node request retries (default: 5)
 --debug, -d                                                                    Enable debug logging (LOTS of output, overrides configuration) (default: false)
 --rpc-endpoint value, -r value                                                 RPC node address
@@ -108,11 +107,18 @@ OPTIONS:
 
 This command works as follows:
 1. Fetches the current block height from the RPC node.
-2. Searches for the oldest half-filled batch of block objects stored in NeoFS. 
+2. Searches for the index files stored in NeoFS.
-3. Fetches missing blocks from the RPC node and uploads them to the NeoFS container 
+3. Searches for the stored blocks from the latest incomplete index file. 
-starting from the oldest half-filled batch.
+4. Fetches missing blocks from the RPC node and uploads them to the NeoFS container.
-4. After uploading the blocks, it creates index files for the newly uploaded blocks. 
+5. After uploading the blocks, it creates index file based on the uploaded block OIDs. 
-5. Uploads the created index files to the NeoFS container.
+6. Uploads the created index file to the NeoFS container.
+7. Repeats steps 4-6 until the current block height is reached.
 
 If the command is interrupted, it can be resumed. It starts the uploading process
-from the oldest half-filled batch of blocks.
+from the last uploaded index file. 
+
+For a given block sequence, only one type of index file is supported. If new index 
+files are needed (different `index-file-size` or `index-attribute`), the entire 
+block sequence must be uploaded from the beginning. Please, add a comment to the 
+[#3744](https://github.com/nspcc-dev/neo-go/issues/3744) issue if you need this
+functionality.