mc: Vendorize minio-go this brings in streaming support.

This PR brings following changes

- Brings streaming support for mc uploads.
- Brings support for copying objects upto 5TiB
  as a consequence of ComposeObject implementation
  in minio-go.

cmd/client-fs.go

@@ -236,7 +236,7 @@ func (f *fsClient) put(reader io.Reader, size int64, metadata map[string][]strin
 	}
 
 	// Get stat to get the current size.
-	partSt, e := partFile.Stat()
+	partSt, e := os.Stat(objectPartPath)
 	if e != nil {
 		err := f.toClientError(e, objectPartPath)
 		return 0, err.Trace(objectPartPath)
@@ -246,73 +246,33 @@ func (f *fsClient) put(reader io.Reader, size int64, metadata map[string][]strin
 	// Current file offset.
 	var currentOffset = partSt.Size()
 
-	// Use ReadAt() capability when reader implements it, but also avoid it in two cases:
-	// *) reader represents a standard input/output stream since they return illegal seek error when ReadAt() is invoked
-	// *) we know in advance that reader will provide zero length data
-	if readerAt, ok := reader.(io.ReaderAt); ok && !isStdIO(reader) && size > 0 {
-		// Notify the progress bar if any till current size.
-		if progress != nil {
-			if _, e = io.CopyN(ioutil.Discard, progress, currentOffset); e != nil {
+	if !isStdIO(reader) && size > 0 {
+		reader = hookreader.NewHook(reader, progress)
+		if seeker, ok := reader.(io.Seeker); ok {
+			if _, e = seeker.Seek(currentOffset, 0); e != nil {
 				return 0, probe.NewError(e)
 			}
-		}
-
-		// Allocate buffer of 10MiB once.
-		readAtBuffer := make([]byte, 10*1024*1024)
-
-		// Loop through all offsets on incoming io.ReaderAt and write
-		// to the destination.
-		for currentOffset < size {
-			readAtSize, re := readerAt.ReadAt(readAtBuffer, currentOffset)
-			if re != nil && re != io.EOF {
-				// For any errors other than io.EOF, we return error
-				// and breakout.
-				err := f.toClientError(re, objectPartPath)
-				return 0, err.Trace(objectPartPath)
-			}
-			writtenSize, we := partFile.Write(readAtBuffer[:readAtSize])
-			if we != nil {
-				err := f.toClientError(we, objectPartPath)
-				return 0, err.Trace(objectPartPath)
-			}
-			// read size and subsequent write differ, a possible
-			// corruption return here.
-			if readAtSize != writtenSize {
-				// Unexpected write (less data was written than expected).
-				return 0, probe.NewError(UnexpectedShortWrite{
-					InputSize: readAtSize,
-					WriteSize: writtenSize,
-				})
-			}
-			// Notify the progress bar if any for written size.
-			if progress != nil {
-				if _, e = io.CopyN(ioutil.Discard, progress, int64(writtenSize)); e != nil {
-					return totalWritten, probe.NewError(e)
-				}
-			}
-			currentOffset += int64(writtenSize)
-			// Once we see io.EOF we break out of the loop.
-			if re == io.EOF {
-				break
+			// Discard bytes until currentOffset.
+			if _, e = io.CopyN(ioutil.Discard, progress, currentOffset); e != nil {
+				return 0, probe.NewError(e)
 			}
 		}
-		// Save currently copied total into totalWritten.
-		totalWritten = currentOffset
 	} else {
 		reader = hookreader.NewHook(reader, progress)
 		// Discard bytes until currentOffset.
 		if _, e = io.CopyN(ioutil.Discard, reader, currentOffset); e != nil {
 			return 0, probe.NewError(e)
 		}
-		var n int64
-		n, e = io.Copy(partFile, reader)
-		if e != nil {
-			return 0, probe.NewError(e)
-		}
-		// Save currently copied total into totalWritten.
-		totalWritten = n + currentOffset
 	}
 
+	n, e := io.Copy(partFile, reader)
+	if e != nil {
+		return 0, probe.NewError(e)
+	}
+
+	// Save currently copied total into totalWritten.
+	totalWritten = n + currentOffset
+
 	// Close the input reader as well, if possible.
 	closer, ok := reader.(io.Closer)
 	if ok {

cmd/client-s3.go

@@ -514,14 +514,22 @@ func (c *s3Client) Get() (io.Reader, map[string][]string, *probe.Error) {
 
 // Copy - copy object
 func (c *s3Client) Copy(source string, size int64, progress io.Reader) *probe.Error {
-	bucket, object := c.url2BucketAndObject()
-	if bucket == "" {
+	dstBucket, dstObject := c.url2BucketAndObject()
+	if dstBucket == "" {
 		return probe.NewError(BucketNameEmpty{})
 	}
-	// Empty copy conditions
-	copyConds := minio.NewCopyConditions()
-	e := c.api.CopyObject(bucket, object, source, copyConds)
+
+	tokens := splitStr(source, string(c.targetURL.Separator), 3)
+
+	// Source object
+	src := minio.NewSourceInfo(tokens[1], tokens[2], nil)
+
+	// Destination object
+	dst, e := minio.NewDestinationInfo(dstBucket, dstObject, nil, nil)
 	if e != nil {
+		return probe.NewError(e)
+	}
+	if e = c.api.CopyObject(dst, src); e != nil {
 		errResponse := minio.ToErrorResponse(e)
 		if errResponse.Code == "AccessDenied" {
 			return probe.NewError(PathInsufficientPermission{
@@ -530,12 +538,12 @@ func (c *s3Client) Copy(source string, size int64, progress io.Reader) *probe.Er
 		}
 		if errResponse.Code == "NoSuchBucket" {
 			return probe.NewError(BucketDoesNotExist{
-				Bucket: bucket,
+				Bucket: dstBucket,
 			})
 		}
 		if errResponse.Code == "InvalidBucketName" {
 			return probe.NewError(BucketInvalid{
-				Bucket: bucket,
+				Bucket: dstBucket,
 			})
 		}
 		if errResponse.Code == "NoSuchKey" || errResponse.Code == "InvalidArgument" {
@@ -563,7 +571,7 @@ func (c *s3Client) Put(reader io.Reader, size int64, metadata map[string][]strin
 	if bucket == "" {
 		return 0, probe.NewError(BucketNameEmpty{})
 	}
-	n, e := c.api.PutObjectWithMetadata(bucket, object, reader, metadata, progress)
+	n, e := c.api.PutObjectWithSize(bucket, object, reader, size, metadata, progress)
 	if e != nil {
 		errResponse := minio.ToErrorResponse(e)
 		if errResponse.Code == "UnexpectedEOF" || e == io.EOF {

cmd/client-s3_test.go

@@ -90,10 +90,6 @@ func (h objectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			w.WriteHeader(http.StatusInternalServerError)
 			return
 		}
-		if !bytes.Equal(h.data, buffer.Bytes()) {
-			w.WriteHeader(http.StatusInternalServerError)
-			return
-		}
 		w.Header().Set("ETag", "9af2f8218b150c351ad802c6f3d66abe")
 		w.WriteHeader(http.StatusOK)
 	case r.Method == "HEAD":

cmd/common-methods.go

@@ -136,8 +136,8 @@ func uploadSourceToTargetURL(urls URLs, progress io.Reader) URLs {
 	targetURL := urls.TargetContent.URL
 	length := urls.SourceContent.Size
 
-	// Optimize for server side copy if object is <= 5GiB and the host is same.
-	if length <= globalMaximumPutSize && sourceAlias == targetAlias {
+	// Optimize for server side copy if the host is same.
+	if sourceAlias == targetAlias {
 		sourcePath := filepath.ToSlash(sourceURL.Path)
 		err := copySourceToTargetURL(targetAlias, targetURL.String(), sourcePath, length, progress)
 		if err != nil {

cmd/globals.go

@@ -48,10 +48,6 @@ const (
 
 	// Global error exit status.
 	globalErrorExitStatus = 1
-
-	// Maximum size for a single PUT operation.
-	globalMaximumPutSize = 5 * 1024 * 1024 * 1024 // 5GiB.
-
 )
 
 var (

pkg/hookreader/hookreader.go

@@ -22,11 +22,31 @@ package hookreader
 
 import "io"
 
+// hookReader hooks additional reader in the source stream. It is
+// useful for making progress bars. Second reader is appropriately
+// notified about the exact number of bytes read from the primary
+// source on each Read operation.
 type hookReader struct {
 	source io.Reader
 	hook   io.Reader
 }
 
+// Seek implements io.Seeker. Seeks source first, and if necessary
+// seeks hook if Seek method is appropriately found.
+func (hr *hookReader) Seek(offset int64, whence int) (n int64, err error) {
+	// Verify for source has embedded Seeker, use it.
+	sourceSeeker, ok := hr.source.(io.Seeker)
+	if ok {
+		return sourceSeeker.Seek(offset, whence)
+	}
+	// Verify if hook has embedded Seeker, use it.
+	hookSeeker, ok := hr.hook.(io.Seeker)
+	if ok {
+		return hookSeeker.Seek(offset, whence)
+	}
+	return n, nil
+}
+
 // Read implements io.Reader. Always reads from the source, the return
 // value 'n' number of bytes are reported through the hook. Returns
 // error for all non io.EOF conditions.