xl/getObjectInfo: Returns back proper size, modTime and md5Sum. (#1479)

Fixes #1469

xl-objects-multipart.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"io"
 	"path"
+	"time"
 )
 
 // MultipartPartInfo Info of each part kept in the multipart metadata file after
@@ -33,20 +34,17 @@ type MultipartPartInfo struct {
 
 // MultipartObjectInfo - contents of the multipart metadata file after
 // CompleteMultipartUpload() is called.
-type MultipartObjectInfo []MultipartPartInfo
-
-// GetSize - Return the size of the object.
-func (m MultipartObjectInfo) GetSize() (size int64) {
-	for _, part := range m {
-		size += part.Size
-	}
-	return
+type MultipartObjectInfo struct {
+	Parts   []MultipartPartInfo
+	ModTime time.Time
+	Size    int64
+	MD5Sum  string
 }
 
 // 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
-	for i, part := range m {
+	for i, part := range m.Parts {
 		partIndex = i
 		if partOffset < part.Size {
 			return
@@ -98,7 +96,7 @@ func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, upload
 	} else if !status {
 		return "", InvalidUploadID{UploadID: uploadID}
 	}
-	var metadata MultipartObjectInfo
+	var metadata = MultipartObjectInfo{}
 	var md5Sums []string
 	for _, part := range parts {
 		// Construct part suffix.
@@ -111,16 +109,35 @@ func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, upload
 			}
 			return "", err
 		}
-		metadata = append(metadata, MultipartPartInfo{part.PartNumber, part.ETag, fi.Size})
+		// Update metadata parts.
+		metadata.Parts = append(metadata.Parts, MultipartPartInfo{
+			PartNumber: part.PartNumber,
+			ETag:       part.ETag,
+			Size:       fi.Size,
+		})
+		metadata.Size += fi.Size
+
 		multipartObjSuffix := path.Join(object, partNumToPartFileName(part.PartNumber))
 		err = xl.storage.RenameFile(minioMetaBucket, multipartPartFile, bucket, multipartObjSuffix)
-		// We need a way to roll back if of the renames failed.
+		// TODO: We need a way to roll back if of the renames failed.
 		if err != nil {
 			return "", err
 		}
+
+		// Save md5sum for future response.
 		md5Sums = append(md5Sums, part.ETag)
 	}
 
+	// Calculate and save s3 compatible md5sum.
+	s3MD5, err := makeS3MD5(md5Sums...)
+	if err != nil {
+		return "", err
+	}
+	metadata.MD5Sum = s3MD5
+	// Save modTime as well as the current time.
+	metadata.ModTime = time.Now().UTC()
+
+	// Create temporary multipart meta file to write and then rename.
 	tempMultipartMetaFile := path.Join(tmpMetaPrefix, bucket, object, multipartMetaFile)
 	w, err := xl.storage.CreateFile(minioMetaBucket, tempMultipartMetaFile)
 	if err != nil {
@@ -138,11 +155,6 @@ func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, upload
 	if err = w.Close(); err != nil {
 		return "", err
 	}
-	// Save the s3 md5.
-	s3MD5, err := makeS3MD5(md5Sums...)
-	if err != nil {
-		return "", err
-	}
 	multipartObjFile := path.Join(object, multipartMetaFile)
 	err = xl.storage.RenameFile(minioMetaBucket, tempMultipartMetaFile, bucket, multipartObjFile)
 	if err != nil {

xl-objects.go

@@ -102,8 +102,8 @@ func (xl xlObjects) GetObject(bucket, object string, startOffset int64) (io.Read
 		return nil, toObjectErr(err, bucket, object)
 	}
 	go func() {
-		for ; partIndex < len(info); partIndex++ {
-			part := info[partIndex]
+		for ; partIndex < len(info.Parts); partIndex++ {
+			part := info.Parts[partIndex]
 			r, err := xl.storage.ReadFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)), offset)
 			if err != nil {
 				fileWriter.CloseWithError(err)
@@ -147,7 +147,9 @@ func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 		if err != nil {
 			return ObjectInfo{}, toObjectErr(err, bucket, object)
 		}
-		fi.Size = info.GetSize()
+		fi.Size = info.Size
+		fi.ModTime = info.ModTime
+		fi.MD5Sum = info.MD5Sum
 	}
 	contentType := "application/octet-stream"
 	if objectExt := filepath.Ext(object); objectExt != "" {
@@ -163,7 +165,7 @@ func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 		Size:        fi.Size,
 		IsDir:       fi.Mode.IsDir(),
 		ContentType: contentType,
-		MD5Sum:      "", // Read from metadata.
+		MD5Sum:      fi.MD5Sum,
 	}, nil
 }
 
@@ -206,7 +208,7 @@ func (xl xlObjects) DeleteObject(bucket, object string) error {
 		return toObjectErr(err, bucket, object)
 	}
 	// Range through all files and delete it.
-	for _, part := range info {
+	for _, part := range info.Parts {
 		err = xl.storage.DeleteFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)))
 		if err != nil {
 			return toObjectErr(err, bucket, object)
@@ -273,7 +275,9 @@ func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKey
 					fileInfo.Mode = 0
 
 					fileInfo.Name = strings.TrimSuffix(fileInfo.Name, slashSeparator)
-					fileInfo.Size = info.GetSize()
+					fileInfo.Size = info.Size
+					fileInfo.ModTime = info.ModTime
+					fileInfo.MD5Sum = info.MD5Sum
 				} else if err != errFileNotFound {
 					return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
 				}
@@ -287,7 +291,9 @@ func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKey
 				if err != nil {
 					return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
 				}
-				fileInfo.Size = info.GetSize()
+				fileInfo.Size = info.Size
+				fileInfo.ModTime = info.ModTime
+				fileInfo.MD5Sum = info.MD5Sum
 				allFileInfos = append(allFileInfos, fileInfo)
 				maxKeys--
 				continue