XL/ListObjects: Fix ordering issue during listing if the files were uploaded as multipart uploads. (#1498) (#1506)

i.e if two files "tmp" and "tmp.1" are uploaded as multipart we would list ""tmp.1"" before ""tmp"" as "tmp.1/" < "tmp/"

fs-objects.go

@@ -22,7 +22,6 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/Sirupsen/logrus"
 	"github.com/minio/minio/pkg/mimedb"
 )
 
@@ -157,118 +156,5 @@ func (fs fsObjects) DeleteObject(bucket, object string) error {
 }
 
 func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
-	}
-	// Verify whether the bucket exists.
-	if isExist, err := isBucketExist(fs.storage, bucket); err != nil {
-		return ListObjectsInfo{}, err
-	} else if !isExist {
-		return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListObjectsInfo{}, UnsupportedDelimiter{
-			Delimiter: delimiter,
-		}
-	}
-	// Verify if marker has prefix.
-	if marker != "" {
-		if !strings.HasPrefix(marker, prefix) {
-			return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
-				Marker: marker,
-				Prefix: prefix,
-			}
-		}
-	}
-
-	if maxKeys == 0 {
-		return ListObjectsInfo{}, nil
-	}
-
-	// Over flowing count - reset to maxObjectList.
-	if maxKeys < 0 || maxKeys > maxObjectList {
-		maxKeys = maxObjectList
-	}
-
-	// Default is recursive, if delimiter is set then list non recursive.
-	recursive := true
-	if delimiter == slashSeparator {
-		recursive = false
-	}
-
-	walker := lookupTreeWalk(fs, listParams{bucket, recursive, marker, prefix})
-	if walker == nil {
-		walker = startTreeWalk(fs, bucket, prefix, marker, recursive)
-	}
-	var fileInfos []FileInfo
-	var eof bool
-	var nextMarker string
-	log.Debugf("Reading from the tree walk channel has begun.")
-	for i := 0; i < maxKeys; {
-		walkResult, ok := <-walker.ch
-		if !ok {
-			// Closed channel.
-			eof = true
-			break
-		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			log.WithFields(logrus.Fields{
-				"bucket":    bucket,
-				"prefix":    prefix,
-				"marker":    marker,
-				"recursive": recursive,
-			}).Debugf("Walk resulted in an error %s", walkResult.err)
-			// File not found is a valid case.
-			if walkResult.err == errFileNotFound {
-				return ListObjectsInfo{}, nil
-			}
-			return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
-		}
-		fileInfo := walkResult.fileInfo
-		nextMarker = fileInfo.Name
-		fileInfos = append(fileInfos, fileInfo)
-		if walkResult.end {
-			eof = true
-			break
-		}
-		i++
-	}
-	if len(fileInfos) == 0 {
-		eof = true
-	}
-	params := listParams{bucket, recursive, nextMarker, prefix}
-	log.WithFields(logrus.Fields{
-		"bucket":    params.bucket,
-		"recursive": params.recursive,
-		"marker":    params.marker,
-		"prefix":    params.prefix,
-	}).Debugf("Save the tree walk into map for subsequent requests.")
-	if !eof {
-		saveTreeWalk(fs, params, walker)
-	}
-
-	result := ListObjectsInfo{IsTruncated: !eof}
-	for _, fileInfo := range fileInfos {
-		// With delimiter set we fill in NextMarker and Prefixes.
-		if delimiter == slashSeparator {
-			result.NextMarker = fileInfo.Name
-			if fileInfo.Mode.IsDir() {
-				result.Prefixes = append(result.Prefixes, fileInfo.Name)
-				continue
-			}
-		}
-		result.Objects = append(result.Objects, ObjectInfo{
-			Name:    fileInfo.Name,
-			ModTime: fileInfo.ModTime,
-			Size:    fileInfo.Size,
-			IsDir:   false,
-		})
-	}
-	return result, nil
+	return listObjectsCommon(fs, bucket, prefix, marker, delimiter, maxKeys)
 }

object-common.go

@@ -22,6 +22,9 @@ import (
 	"io"
 	"path"
 	"sort"
+	"strings"
+
+	"github.com/Sirupsen/logrus"
 )
 
 // Common initialization needed for both object layers.
@@ -191,6 +194,130 @@ func putObjectCommon(storage StorageAPI, bucket string, object string, size int6
 	return newMD5Hex, nil
 }
 
+func listObjectsCommon(layer ObjectLayer, bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+	var disk StorageAPI
+	switch l := layer.(type) {
+	case xlObjects:
+		disk = l.storage
+	case fsObjects:
+		disk = l.storage
+	}
+
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
+	}
+
+	// Verify whether the bucket exists.
+	if isExist, err := isBucketExist(disk, bucket); err != nil {
+		return ListObjectsInfo{}, err
+	} else if !isExist {
+		return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
+	}
+
+	if !IsValidObjectPrefix(prefix) {
+		return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
+	}
+	// Verify if delimiter is anything other than '/', which we do not support.
+	if delimiter != "" && delimiter != slashSeparator {
+		return ListObjectsInfo{}, UnsupportedDelimiter{
+			Delimiter: delimiter,
+		}
+	}
+	// Verify if marker has prefix.
+	if marker != "" {
+		if !strings.HasPrefix(marker, prefix) {
+			return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
+				Marker: marker,
+				Prefix: prefix,
+			}
+		}
+	}
+
+	if maxKeys == 0 {
+		return ListObjectsInfo{}, nil
+	}
+
+	// Over flowing count - reset to maxObjectList.
+	if maxKeys < 0 || maxKeys > maxObjectList {
+		maxKeys = maxObjectList
+	}
+
+	// Default is recursive, if delimiter is set then list non recursive.
+	recursive := true
+	if delimiter == slashSeparator {
+		recursive = false
+	}
+
+	walker := lookupTreeWalk(layer, listParams{bucket, recursive, marker, prefix})
+	if walker == nil {
+		walker = startTreeWalk(layer, bucket, prefix, marker, recursive)
+	}
+	var fileInfos []FileInfo
+	var eof bool
+	var nextMarker string
+	log.Debugf("Reading from the tree walk channel has begun.")
+	for i := 0; i < maxKeys; {
+		walkResult, ok := <-walker.ch
+		if !ok {
+			// Closed channel.
+			eof = true
+			break
+		}
+		// For any walk error return right away.
+		if walkResult.err != nil {
+			log.WithFields(logrus.Fields{
+				"bucket":    bucket,
+				"prefix":    prefix,
+				"marker":    marker,
+				"recursive": recursive,
+			}).Debugf("Walk resulted in an error %s", walkResult.err)
+			// File not found is a valid case.
+			if walkResult.err == errFileNotFound {
+				return ListObjectsInfo{}, nil
+			}
+			return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
+		}
+		fileInfo := walkResult.fileInfo
+		nextMarker = fileInfo.Name
+		fileInfos = append(fileInfos, fileInfo)
+		if walkResult.end {
+			eof = true
+			break
+		}
+		i++
+	}
+	params := listParams{bucket, recursive, nextMarker, prefix}
+	log.WithFields(logrus.Fields{
+		"bucket":    params.bucket,
+		"recursive": params.recursive,
+		"marker":    params.marker,
+		"prefix":    params.prefix,
+	}).Debugf("Save the tree walk into map for subsequent requests.")
+	if !eof {
+		saveTreeWalk(layer, params, walker)
+	}
+
+	result := ListObjectsInfo{IsTruncated: !eof}
+	for _, fileInfo := range fileInfos {
+		// With delimiter set we fill in NextMarker and Prefixes.
+		if delimiter == slashSeparator {
+			result.NextMarker = fileInfo.Name
+			if fileInfo.Mode.IsDir() {
+				result.Prefixes = append(result.Prefixes, fileInfo.Name)
+				continue
+			}
+		}
+		result.Objects = append(result.Objects, ObjectInfo{
+			Name:    fileInfo.Name,
+			ModTime: fileInfo.ModTime,
+			Size:    fileInfo.Size,
+			IsDir:   false,
+		})
+	}
+	return result, nil
+}
+
 // checks whether bucket exists.
 func isBucketExist(storage StorageAPI, bucketName string) (bool, error) {
 	// Check whether bucket exists.

tree-walk.go

@@ -51,11 +51,21 @@ type treeWalker struct {
 }
 
 // treeWalk walks FS directory tree recursively pushing fileInfo into the channel as and when it encounters files.
-func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker string, recursive bool, send func(treeWalkResult) bool, count *int) bool {
+func treeWalk(layer ObjectLayer, bucket, prefixDir, entryPrefixMatch, marker string, recursive bool, send func(treeWalkResult) bool, count *int) bool {
 	// Example:
 	// if prefixDir="one/two/three/" and marker="four/five.txt" treeWalk is recursively
 	// called with prefixDir="one/two/three/four/" and marker="five.txt"
 
+	var isXL bool
+	var disk StorageAPI
+	switch l := layer.(type) {
+	case xlObjects:
+		isXL = true
+		disk = l.storage
+	case fsObjects:
+		disk = l.storage
+	}
+
 	// Convert entry to FileInfo
 	entryToFileInfo := func(entry string) (fileInfo FileInfo, err error) {
 		if strings.HasSuffix(entry, slashSeparator) {
@@ -65,6 +75,25 @@ func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker strin
 			fileInfo.Mode = os.ModeDir
 			return
 		}
+		if isXL && strings.HasSuffix(entry, multipartSuffix) {
+			// If the entry was detected as a multipart file we use
+			// getMultipartObjectInfo() to fill the FileInfo structure.
+			entry = strings.Trim(entry, multipartSuffix)
+			var info MultipartObjectInfo
+			info, err = getMultipartObjectInfo(disk, bucket, path.Join(prefixDir, entry))
+			if err != nil {
+				return
+			}
+			// Set the Mode to a "regular" file.
+			fileInfo.Mode = 0
+			// Trim the suffix that was temporarily added to indicate that this
+			// is a multipart file.
+			fileInfo.Name = path.Join(prefixDir, entry)
+			fileInfo.Size = info.Size
+			fileInfo.MD5Sum = info.MD5Sum
+			fileInfo.ModTime = info.ModTime
+			return
+		}
 		if fileInfo, err = disk.StatFile(bucket, path.Join(prefixDir, entry)); err != nil {
 			return
 		}
@@ -88,6 +117,7 @@ func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker strin
 		send(treeWalkResult{err: err})
 		return false
 	}
+
 	if entryPrefixMatch != "" {
 		for i, entry := range entries {
 			if !strings.HasPrefix(entry, entryPrefixMatch) {
@@ -98,7 +128,14 @@ func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker strin
 			}
 		}
 	}
-	sort.StringSlice(entries).Sort()
+	// For XL multipart files strip the trailing "/" and append ".minio.multipart" to the entry so that
+	// entryToFileInfo() can call StatFile for regular files or getMultipartObjectInfo() for multipart files.
+	for i, entry := range entries {
+		if isXL && strings.HasSuffix(entry, slashSeparator) && isLeafDirectory(disk, bucket, path.Join(prefixDir, entry)) {
+			entries[i] = strings.TrimSuffix(entry, slashSeparator) + multipartSuffix
+		}
+	}
+	sort.Sort(byMultipartFiles(entries))
 	// Skip the empty strings
 	for len(entries) > 0 && entries[0] == "" {
 		entries = entries[1:]
@@ -109,7 +146,7 @@ func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker strin
 	// example:
 	// If markerDir="four/" Search() returns the index of "four/" in the sorted
 	// entries list so we skip all the entries till "four/"
-	idx := sort.StringSlice(entries).Search(markerDir)
+	idx := sort.Search(len(entries), func(i int) bool { return strings.TrimSuffix(entries[i], multipartSuffix) >= markerDir })
 	entries = entries[idx:]
 	*count += len(entries)
 	for i, entry := range entries {
@@ -140,7 +177,7 @@ func treeWalk(disk StorageAPI, bucket, prefixDir, entryPrefixMatch, marker strin
 			}
 			*count--
 			prefixMatch := "" // Valid only for first level treeWalk and empty for subdirectories.
-			if !treeWalk(disk, bucket, path.Join(prefixDir, entry), prefixMatch, markerArg, recursive, send, count) {
+			if !treeWalk(layer, bucket, path.Join(prefixDir, entry), prefixMatch, markerArg, recursive, send, count) {
 				return false
 			}
 			continue
@@ -170,13 +207,6 @@ func startTreeWalk(layer ObjectLayer, bucket, prefix, marker string, recursive b
 	// if prefix is "one/two/th" and marker is "one/two/three/four/five.txt"
 	// treeWalk is called with prefixDir="one/two/" and marker="three/four/five.txt"
 	// and entryPrefixMatch="th"
-	var disk StorageAPI
-	switch l := layer.(type) {
-	case xlObjects:
-		disk = l.storage
-	case fsObjects:
-		disk = l.storage
-	}
 
 	ch := make(chan treeWalkResult, maxObjectList)
 	walkNotify := treeWalker{ch: ch}
@@ -204,7 +234,7 @@ func startTreeWalk(layer ObjectLayer, bucket, prefix, marker string, recursive b
 				return false
 			}
 		}
-		treeWalk(disk, bucket, prefixDir, entryPrefixMatch, marker, recursive, send, &count)
+		treeWalk(layer, bucket, prefixDir, entryPrefixMatch, marker, recursive, send, &count)
 	}()
 	return &walkNotify
 }

xl-objects-multipart.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"io"
 	"path"
+	"strings"
 	"time"
 )
 
@@ -41,6 +42,16 @@ type MultipartObjectInfo struct {
 	MD5Sum  string
 }
 
+type byMultipartFiles []string
+
+func (files byMultipartFiles) Len() int { return len(files) }
+func (files byMultipartFiles) Less(i, j int) bool {
+	first := strings.TrimSuffix(files[i], multipartSuffix)
+	second := strings.TrimSuffix(files[j], multipartSuffix)
+	return first < second
+}
+func (files byMultipartFiles) Swap(i, j int) { files[i], files[j] = files[j], files[i] }
+
 // GetPartNumberOffset - given an offset for the whole object, return the part and offset in that part.
 func (m MultipartObjectInfo) GetPartNumberOffset(offset int64) (partIndex int, partOffset int64, err error) {
 	partOffset = offset

xl-objects.go

@@ -19,12 +19,10 @@ package main
 import (
 	"encoding/json"
 	"io"
-	"path"
 	"path/filepath"
 	"strings"
 	"sync"
 
-	"github.com/Sirupsen/logrus"
 	"github.com/minio/minio/pkg/mimedb"
 )
 
@@ -163,7 +161,9 @@ func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 	}
 	fi, err := xl.storage.StatFile(bucket, object)
 	if err != nil {
-		if err == errFileNotFound {
+		if err != errFileNotFound {
+			return ObjectInfo{}, toObjectErr(err, bucket, object)
+		}
 		var info MultipartObjectInfo
 		info, err = getMultipartObjectInfo(xl.storage, bucket, object)
 		if err != nil {
@@ -173,8 +173,6 @@ func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 		fi.ModTime = info.ModTime
 		fi.MD5Sum = info.MD5Sum
 	}
-		return ObjectInfo{}, toObjectErr(err, bucket, object)
-	}
 	contentType := "application/octet-stream"
 	if objectExt := filepath.Ext(object); objectExt != "" {
 		content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
@@ -246,143 +244,5 @@ func (xl xlObjects) DeleteObject(bucket, object string) error {
 }
 
 func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
-	}
-	// Verify whether the bucket exists.
-	if isExist, err := isBucketExist(xl.storage, bucket); err != nil {
-		return ListObjectsInfo{}, err
-	} else if !isExist {
-		return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListObjectsInfo{}, UnsupportedDelimiter{
-			Delimiter: delimiter,
-		}
-	}
-	// Verify if marker has prefix.
-	if marker != "" {
-		if !strings.HasPrefix(marker, prefix) {
-			return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
-				Marker: marker,
-				Prefix: prefix,
-			}
-		}
-	}
-
-	if maxKeys == 0 {
-		return ListObjectsInfo{}, nil
-	}
-
-	// Default is recursive, if delimiter is set then list non recursive.
-	recursive := true
-	if delimiter == slashSeparator {
-		recursive = false
-	}
-
-	walker := lookupTreeWalk(xl, listParams{bucket, recursive, marker, prefix})
-	if walker == nil {
-		walker = startTreeWalk(xl, bucket, prefix, marker, recursive)
-	}
-	var fileInfos []FileInfo
-	var eof bool
-	var err error
-	var nextMarker string
-	log.Debugf("Reading from the tree walk channel has begun.")
-	for i := 0; i < maxKeys; {
-		walkResult, ok := <-walker.ch
-		if !ok {
-			// Closed channel.
-			eof = true
-			break
-		}
-		// For any walk error return right away.
-		if walkResult.err != nil {
-			log.WithFields(logrus.Fields{
-				"bucket":    bucket,
-				"prefix":    prefix,
-				"marker":    marker,
-				"recursive": recursive,
-			}).Debugf("Walk resulted in an error %s", walkResult.err)
-			// File not found is a valid case.
-			if walkResult.err == errFileNotFound {
-				return ListObjectsInfo{}, nil
-			}
-			return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
-		}
-		fileInfo := walkResult.fileInfo
-		if strings.HasSuffix(fileInfo.Name, slashSeparator) && isLeafDirectory(xl.storage, bucket, fileInfo.Name) {
-			// Code flow reaches here for non-recursive listing.
-
-			var info MultipartObjectInfo
-			info, err = getMultipartObjectInfo(xl.storage, bucket, fileInfo.Name)
-			if err == nil {
-				// Set the Mode to a "regular" file.
-				fileInfo.Mode = 0
-				fileInfo.Name = strings.TrimSuffix(fileInfo.Name, slashSeparator)
-				fileInfo.Size = info.Size
-				fileInfo.MD5Sum = info.MD5Sum
-				fileInfo.ModTime = info.ModTime
-			} else if err != errFileNotFound {
-				return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
-			}
-		} else if strings.HasSuffix(fileInfo.Name, multipartMetaFile) {
-			// Code flow reaches here for recursive listing.
-
-			// for object/00000.minio.multipart, strip the base name
-			// and calculate get the object size.
-			fileInfo.Name = path.Dir(fileInfo.Name)
-			var info MultipartObjectInfo
-			info, err = getMultipartObjectInfo(xl.storage, bucket, fileInfo.Name)
-			if err != nil {
-				return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
-			}
-			fileInfo.Size = info.Size
-		} else if strings.HasSuffix(fileInfo.Name, multipartSuffix) {
-			// Ignore the part files like object/00001.minio.multipart
-			continue
-		}
-		nextMarker = fileInfo.Name
-		fileInfos = append(fileInfos, fileInfo)
-		if walkResult.end {
-			eof = true
-			break
-		}
-		i++
-	}
-	params := listParams{bucket, recursive, nextMarker, prefix}
-	log.WithFields(logrus.Fields{
-		"bucket":    params.bucket,
-		"recursive": params.recursive,
-		"marker":    params.marker,
-		"prefix":    params.prefix,
-	}).Debugf("Save the tree walk into map for subsequent requests.")
-	if !eof {
-		saveTreeWalk(xl, params, walker)
-	}
-
-	result := ListObjectsInfo{IsTruncated: !eof}
-
-	for _, fileInfo := range fileInfos {
-		// With delimiter set we fill in NextMarker and Prefixes.
-		if delimiter == slashSeparator {
-			result.NextMarker = fileInfo.Name
-			if fileInfo.Mode.IsDir() {
-				result.Prefixes = append(result.Prefixes, fileInfo.Name)
-				continue
-			}
-		}
-		result.Objects = append(result.Objects, ObjectInfo{
-			Name:    fileInfo.Name,
-			ModTime: fileInfo.ModTime,
-			Size:    fileInfo.Size,
-			IsDir:   false,
-		})
-	}
-	return result, nil
+	return listObjectsCommon(xl, bucket, prefix, marker, delimiter, maxKeys)
 }