Merge pull request #454 from harshavardhana/pr_out_update_minio_io_donut_minio_io_objectdriver

Godeps/Godeps.json

@@ -24,7 +24,7 @@
 		},
 		{
 			"ImportPath": "github.com/minio-io/donut",
-			"Rev": "9d0c663a857103c780414e15d7e426c6fca9984e"
+			"Rev": "2b8c72e28768f47511730adae5e780550fdc0236"
 		},
 		{
 			"ImportPath": "github.com/minio-io/erasure",
@@ -36,7 +36,7 @@
 		},
 		{
 			"ImportPath": "github.com/minio-io/objectdriver",
-			"Rev": "3efb266b6a644b161d8a4d9a1f55bea95a2e391b"
+			"Rev": "64e55f18297dd962102afc7e81ea63488fc4706a"
 		},
 		{
 			"ImportPath": "github.com/stretchr/objx",

Godeps/_workspace/src/github.com/minio-io/donut/bucket.go

@@ -26,6 +26,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/minio-io/iodine"
+
 	"crypto/md5"
 	"encoding/hex"
 )
@@ -39,8 +41,12 @@ type bucket struct {
 
 // NewBucket - instantiate a new bucket
 func NewBucket(bucketName, donutName string, nodes map[string]Node) (Bucket, error) {
-	if bucketName == "" {
-		return nil, errors.New("invalid argument")
+	errParams := map[string]string{
+		"bucketName": bucketName,
+		"donutName":  donutName,
+	}
+	if strings.TrimSpace(bucketName) == "" || strings.TrimSpace(donutName) == "" {
+		return nil, iodine.New(errors.New("invalid argument"), errParams)
 	}
 	b := bucket{}
 	b.name = bucketName
@@ -55,27 +61,27 @@ func (b bucket) ListObjects() (map[string]Object, error) {
 	for _, node := range b.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 		for _, disk := range disks {
 			bucketSlice := fmt.Sprintf("%s$%d$%d", b.name, nodeSlice, disk.GetOrder())
 			bucketPath := path.Join(b.donutName, bucketSlice)
 			objects, err := disk.ListDir(bucketPath)
 			if err != nil {
-				return nil, err
+				return nil, iodine.New(err, nil)
 			}
 			for _, object := range objects {
 				newObject, err := NewObject(object.Name(), path.Join(disk.GetPath(), bucketPath))
 				if err != nil {
-					return nil, err
+					return nil, iodine.New(err, nil)
 				}
 				newObjectMetadata, err := newObject.GetObjectMetadata()
 				if err != nil {
-					return nil, err
+					return nil, iodine.New(err, nil)
 				}
 				objectName, ok := newObjectMetadata["object"]
 				if !ok {
-					return nil, errors.New("object corrupted")
+					return nil, iodine.New(errors.New("object corrupted"), nil)
 				}
 				b.objects[objectName] = newObject
 			}
@@ -90,82 +96,101 @@ func (b bucket) GetObject(objectName string) (reader io.ReadCloser, size int64,
 	// get list of objects
 	objects, err := b.ListObjects()
 	if err != nil {
-		return nil, 0, err
+		return nil, 0, iodine.New(err, nil)
 	}
 	// check if object exists
 	object, ok := objects[objectName]
 	if !ok {
-		return nil, 0, os.ErrNotExist
+		return nil, 0, iodine.New(os.ErrNotExist, nil)
 	}
 	objectMetadata, err := object.GetObjectMetadata()
 	if err != nil {
-		return nil, 0, err
+		return nil, 0, iodine.New(err, nil)
 	}
 	if objectName == "" || writer == nil || len(objectMetadata) == 0 {
-		return nil, 0, errors.New("invalid argument")
+		return nil, 0, iodine.New(errors.New("invalid argument"), nil)
 	}
 	size, err = strconv.ParseInt(objectMetadata["size"], 10, 64)
 	if err != nil {
-		return nil, 0, err
+		return nil, 0, iodine.New(err, nil)
 	}
-	go b.readEncodedData(b.normalizeObjectName(objectName), writer, objectMetadata)
+	donutObjectMetadata, err := object.GetDonutObjectMetadata()
+	if err != nil {
+		return nil, 0, iodine.New(err, nil)
+	}
+	go b.readEncodedData(b.normalizeObjectName(objectName), writer, donutObjectMetadata)
 	return reader, size, nil
 }
 
-func (b bucket) PutObject(objectName string, objectData io.Reader, metadata map[string]string) error {
+func (b bucket) PutObject(objectName string, objectData io.Reader, expectedMD5Sum string, metadata map[string]string) error {
 	if objectName == "" || objectData == nil {
-		return errors.New("invalid argument")
-	}
-	contentType, ok := metadata["contentType"]
-	if !ok || strings.TrimSpace(contentType) == "" {
-		contentType = "application/octet-stream"
+		return iodine.New(errors.New("invalid argument"), nil)
 	}
 	writers, err := b.getDiskWriters(b.normalizeObjectName(objectName), "data")
 	if err != nil {
-		return err
-	}
-	for _, writer := range writers {
-		defer writer.Close()
+		return iodine.New(err, nil)
 	}
 	summer := md5.New()
 	objectMetadata := make(map[string]string)
+	donutObjectMetadata := make(map[string]string)
+	objectMetadata["version"] = "1.0"
+	donutObjectMetadata["version"] = "1.0"
 	switch len(writers) == 1 {
 	case true:
 		mw := io.MultiWriter(writers[0], summer)
 		totalLength, err := io.Copy(mw, objectData)
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
+		donutObjectMetadata["sys.size"] = strconv.FormatInt(totalLength, 10)
 		objectMetadata["size"] = strconv.FormatInt(totalLength, 10)
 	case false:
 		k, m, err := b.getDataAndParity(len(writers))
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		chunkCount, totalLength, err := b.writeEncodedData(k, m, writers, objectData, summer)
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
-		objectMetadata["blockSize"] = strconv.Itoa(10 * 1024 * 1024)
-		objectMetadata["chunkCount"] = strconv.Itoa(chunkCount)
-		objectMetadata["erasureK"] = strconv.FormatUint(uint64(k), 10)
-		objectMetadata["erasureM"] = strconv.FormatUint(uint64(m), 10)
-		objectMetadata["erasureTechnique"] = "Cauchy"
+		donutObjectMetadata["sys.blockSize"] = strconv.Itoa(10 * 1024 * 1024)
+		donutObjectMetadata["sys.chunkCount"] = strconv.Itoa(chunkCount)
+		donutObjectMetadata["sys.erasureK"] = strconv.FormatUint(uint64(k), 10)
+		donutObjectMetadata["sys.erasureM"] = strconv.FormatUint(uint64(m), 10)
+		donutObjectMetadata["sys.erasureTechnique"] = "Cauchy"
+		donutObjectMetadata["sys.size"] = strconv.Itoa(totalLength)
 		objectMetadata["size"] = strconv.Itoa(totalLength)
 	}
+	objectMetadata["bucket"] = b.name
+	objectMetadata["object"] = objectName
+	for k, v := range metadata {
+		objectMetadata[k] = v
+	}
 	dataMd5sum := summer.Sum(nil)
 	objectMetadata["created"] = time.Now().Format(time.RFC3339Nano)
+
+	// keeping md5sum for the object in two different places
+	// one for object storage and another is for internal use
 	objectMetadata["md5"] = hex.EncodeToString(dataMd5sum)
-	if _, ok := metadata["expectedMd5Sum"]; ok {
-		if err := b.isMD5SumEqual(metadata["expectedMd5sum"], objectMetadata["md5"]); err != nil {
-			return err
+	donutObjectMetadata["sys.md5"] = hex.EncodeToString(dataMd5sum)
+
+	// Verify if the written object is equal to what is expected, only if it is requested as such
+	if strings.TrimSpace(expectedMD5Sum) != "" {
+		if err := b.isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), objectMetadata["md5"]); err != nil {
+			return iodine.New(err, nil)
 		}
 	}
-	objectMetadata["bucket"] = b.name
-	objectMetadata["object"] = objectName
-	objectMetadata["contentType"] = strings.TrimSpace(contentType)
-	if err := b.writeDonutObjectMetadata(b.normalizeObjectName(objectName), objectMetadata); err != nil {
-		return err
+	// write donut specific metadata
+	if err := b.writeDonutObjectMetadata(b.normalizeObjectName(objectName), donutObjectMetadata); err != nil {
+		return iodine.New(err, nil)
+	}
+	// write object specific metadata
+	if err := b.writeObjectMetadata(b.normalizeObjectName(objectName), objectMetadata); err != nil {
+		return iodine.New(err, nil)
+	}
+	// close all writers, when control flow reaches here
+	for _, writer := range writers {
+		writer.Close()
 	}
 	return nil
 }

Godeps/_workspace/src/github.com/minio-io/donut/bucket_internal.go

@@ -19,7 +19,6 @@ package donut
 import (
 	"bytes"
 	"crypto/md5"
-	"encoding/base64"
 	"encoding/hex"
 	"encoding/json"
 	"errors"
@@ -36,7 +35,7 @@ import (
 
 func (b bucket) isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) error {
 	if strings.TrimSpace(expectedMD5Sum) != "" && strings.TrimSpace(actualMD5Sum) != "" {
-		expectedMD5SumBytes, err := base64.StdEncoding.DecodeString(expectedMD5Sum)
+		expectedMD5SumBytes, err := hex.DecodeString(expectedMD5Sum)
 		if err != nil {
 			return iodine.New(err, nil)
 		}
@@ -52,13 +51,33 @@ func (b bucket) isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) error {
 	return iodine.New(errors.New("invalid argument"), nil)
 }
 
-func (b bucket) writeDonutObjectMetadata(objectName string, objectMetadata map[string]string) error {
+func (b bucket) writeObjectMetadata(objectName string, objectMetadata map[string]string) error {
 	if len(objectMetadata) == 0 {
-		return errors.New("invalid argument")
+		return iodine.New(errors.New("invalid argument"), nil)
 	}
 	objectMetadataWriters, err := b.getDiskWriters(objectName, objectMetadataConfig)
 	if err != nil {
-		return err
+		return iodine.New(err, nil)
+	}
+	for _, objectMetadataWriter := range objectMetadataWriters {
+		defer objectMetadataWriter.Close()
+	}
+	for _, objectMetadataWriter := range objectMetadataWriters {
+		jenc := json.NewEncoder(objectMetadataWriter)
+		if err := jenc.Encode(objectMetadata); err != nil {
+			return iodine.New(err, nil)
+		}
+	}
+	return nil
+}
+
+func (b bucket) writeDonutObjectMetadata(objectName string, objectMetadata map[string]string) error {
+	if len(objectMetadata) == 0 {
+		return iodine.New(errors.New("invalid argument"), nil)
+	}
+	objectMetadataWriters, err := b.getDiskWriters(objectName, donutObjectMetadataConfig)
+	if err != nil {
+		return iodine.New(err, nil)
 	}
 	for _, objectMetadataWriter := range objectMetadataWriters {
 		defer objectMetadataWriter.Close()
@@ -66,7 +85,7 @@ func (b bucket) writeDonutObjectMetadata(objectName string, objectMetadata map[s
 	for _, objectMetadataWriter := range objectMetadataWriters {
 		jenc := json.NewEncoder(objectMetadataWriter)
 		if err := jenc.Encode(objectMetadata); err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 	}
 	return nil
@@ -80,12 +99,12 @@ func (b bucket) normalizeObjectName(objectName string) string {
 
 func (b bucket) getDataAndParity(totalWriters int) (k uint8, m uint8, err error) {
 	if totalWriters <= 1 {
-		return 0, 0, errors.New("invalid argument")
+		return 0, 0, iodine.New(errors.New("invalid argument"), nil)
 	}
 	quotient := totalWriters / 2 // not using float or abs to let integer round off to lower value
 	// quotient cannot be bigger than (255 / 2) = 127
 	if quotient > 127 {
-		return 0, 0, errors.New("parity over flow")
+		return 0, 0, iodine.New(errors.New("parity over flow"), nil)
 	}
 	remainder := totalWriters % 2 // will be 1 for odd and 0 for even numbers
 	k = uint8(quotient + remainder)
@@ -97,7 +116,7 @@ func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectDat
 	chunks := split.Stream(objectData, 10*1024*1024)
 	encoder, err := NewEncoder(k, m, "Cauchy")
 	if err != nil {
-		return 0, 0, err
+		return 0, 0, iodine.New(err, nil)
 	}
 	chunkCount := 0
 	totalLength := 0
@@ -109,7 +128,7 @@ func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectDat
 			for blockIndex, block := range encodedBlocks {
 				_, err := io.Copy(writers[blockIndex], bytes.NewBuffer(block))
 				if err != nil {
-					return 0, 0, err
+					return 0, 0, iodine.New(err, nil)
 				}
 			}
 		}
@@ -118,45 +137,46 @@ func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectDat
 	return chunkCount, totalLength, nil
 }
 
-func (b bucket) readEncodedData(objectName string, writer *io.PipeWriter, objectMetadata map[string]string) {
-	expectedMd5sum, err := hex.DecodeString(objectMetadata["md5"])
+func (b bucket) readEncodedData(objectName string, writer *io.PipeWriter, donutObjectMetadata map[string]string) {
+	expectedMd5sum, err := hex.DecodeString(donutObjectMetadata["sys.md5"])
 	if err != nil {
-		writer.CloseWithError(err)
+		writer.CloseWithError(iodine.New(err, nil))
 		return
 	}
 	readers, err := b.getDiskReaders(objectName, "data")
 	if err != nil {
-		writer.CloseWithError(err)
+		writer.CloseWithError(iodine.New(err, nil))
 		return
 	}
 	hasher := md5.New()
 	mwriter := io.MultiWriter(writer, hasher)
 	switch len(readers) == 1 {
 	case false:
-		totalChunks, totalLeft, blockSize, k, m, err := b.metadata2Values(objectMetadata)
+		totalChunks, totalLeft, blockSize, k, m, err := b.metadata2Values(donutObjectMetadata)
 		if err != nil {
-			writer.CloseWithError(err)
+			writer.CloseWithError(iodine.New(err, nil))
 			return
 		}
-		technique, ok := objectMetadata["erasureTechnique"]
+		technique, ok := donutObjectMetadata["sys.erasureTechnique"]
 		if !ok {
-			writer.CloseWithError(errors.New("missing erasure Technique"))
+			err := errors.New("missing erasure Technique")
+			writer.CloseWithError(iodine.New(err, nil))
 			return
 		}
 		encoder, err := NewEncoder(uint8(k), uint8(m), technique)
 		if err != nil {
-			writer.CloseWithError(err)
+			writer.CloseWithError(iodine.New(err, nil))
 			return
 		}
 		for i := 0; i < totalChunks; i++ {
 			decodedData, err := b.decodeData(totalLeft, blockSize, readers, encoder, writer)
 			if err != nil {
-				writer.CloseWithError(err)
+				writer.CloseWithError(iodine.New(err, nil))
 				return
 			}
 			_, err = io.Copy(mwriter, bytes.NewBuffer(decodedData))
 			if err != nil {
-				writer.CloseWithError(err)
+				writer.CloseWithError(iodine.New(err, nil))
 				return
 			}
 			totalLeft = totalLeft - int64(blockSize)
@@ -164,13 +184,14 @@ func (b bucket) readEncodedData(objectName string, writer *io.PipeWriter, object
 	case true:
 		_, err := io.Copy(writer, readers[0])
 		if err != nil {
-			writer.CloseWithError(err)
+			writer.CloseWithError(iodine.New(err, nil))
 			return
 		}
 	}
 	// check if decodedData md5sum matches
 	if !bytes.Equal(expectedMd5sum, hasher.Sum(nil)) {
-		writer.CloseWithError(errors.New("checksum mismatch"))
+		err := errors.New("checksum mismatch")
+		writer.CloseWithError(iodine.New(err, nil))
 		return
 	}
 	writer.Close()
@@ -186,31 +207,46 @@ func (b bucket) decodeData(totalLeft, blockSize int64, readers []io.ReadCloser,
 	}
 	curChunkSize, err := encoder.GetEncodedBlockLen(int(curBlockSize))
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	encodedBytes := make([][]byte, len(readers))
 	for i, reader := range readers {
 		var bytesBuffer bytes.Buffer
 		_, err := io.CopyN(&bytesBuffer, reader, int64(curChunkSize))
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 		encodedBytes[i] = bytesBuffer.Bytes()
 	}
 	decodedData, err := encoder.Decode(encodedBytes, int(curBlockSize))
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	return decodedData, nil
 }
 
-func (b bucket) metadata2Values(objectMetadata map[string]string) (totalChunks int, totalLeft, blockSize int64, k, m uint64, err error) {
-	totalChunks, err = strconv.Atoi(objectMetadata["chunkCount"])
-	totalLeft, err = strconv.ParseInt(objectMetadata["size"], 10, 64)
-	blockSize, err = strconv.ParseInt(objectMetadata["blockSize"], 10, 64)
-	k, err = strconv.ParseUint(objectMetadata["erasureK"], 10, 8)
-	m, err = strconv.ParseUint(objectMetadata["erasureM"], 10, 8)
-	return
+func (b bucket) metadata2Values(donutObjectMetadata map[string]string) (totalChunks int, totalLeft, blockSize int64, k, m uint64, err error) {
+	totalChunks, err = strconv.Atoi(donutObjectMetadata["sys.chunkCount"])
+	if err != nil {
+		return 0, 0, 0, 0, 0, iodine.New(err, nil)
+	}
+	totalLeft, err = strconv.ParseInt(donutObjectMetadata["sys.size"], 10, 64)
+	if err != nil {
+		return 0, 0, 0, 0, 0, iodine.New(err, nil)
+	}
+	blockSize, err = strconv.ParseInt(donutObjectMetadata["sys.blockSize"], 10, 64)
+	if err != nil {
+		return 0, 0, 0, 0, 0, iodine.New(err, nil)
+	}
+	k, err = strconv.ParseUint(donutObjectMetadata["sys.erasureK"], 10, 8)
+	if err != nil {
+		return 0, 0, 0, 0, 0, iodine.New(err, nil)
+	}
+	m, err = strconv.ParseUint(donutObjectMetadata["sys.erasureM"], 10, 8)
+	if err != nil {
+		return 0, 0, 0, 0, 0, iodine.New(err, nil)
+	}
+	return totalChunks, totalLeft, blockSize, k, m, nil
 }
 
 func (b bucket) getDiskReaders(objectName, objectMeta string) ([]io.ReadCloser, error) {
@@ -219,7 +255,7 @@ func (b bucket) getDiskReaders(objectName, objectMeta string) ([]io.ReadCloser,
 	for _, node := range b.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 		readers = make([]io.ReadCloser, len(disks))
 		for _, disk := range disks {
@@ -227,7 +263,7 @@ func (b bucket) getDiskReaders(objectName, objectMeta string) ([]io.ReadCloser,
 			objectPath := path.Join(b.donutName, bucketSlice, objectName, objectMeta)
 			objectSlice, err := disk.OpenFile(objectPath)
 			if err != nil {
-				return nil, err
+				return nil, iodine.New(err, nil)
 			}
 			readers[disk.GetOrder()] = objectSlice
 		}
@@ -242,7 +278,7 @@ func (b bucket) getDiskWriters(objectName, objectMeta string) ([]io.WriteCloser,
 	for _, node := range b.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 		writers = make([]io.WriteCloser, len(disks))
 		for _, disk := range disks {
@@ -250,7 +286,7 @@ func (b bucket) getDiskWriters(objectName, objectMeta string) ([]io.WriteCloser,
 			objectPath := path.Join(b.donutName, bucketSlice, objectName, objectMeta)
 			objectSlice, err := disk.MakeFile(objectPath)
 			if err != nil {
-				return nil, err
+				return nil, iodine.New(err, nil)
 			}
 			writers[disk.GetOrder()] = objectSlice
 		}

Godeps/_workspace/src/github.com/minio-io/donut/disk.go

@@ -23,6 +23,8 @@ import (
 	"syscall"
 
 	"io/ioutil"
+
+	"github.com/minio-io/iodine"
 )
 
 type disk struct {
@@ -34,19 +36,19 @@ type disk struct {
 // NewDisk - instantiate new disk
 func NewDisk(diskPath string, diskOrder int) (Disk, error) {
 	if diskPath == "" || diskOrder < 0 {
-		return nil, errors.New("invalid argument")
+		return nil, iodine.New(errors.New("invalid argument"), nil)
 	}
 	s := syscall.Statfs_t{}
 	err := syscall.Statfs(diskPath, &s)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	st, err := os.Stat(diskPath)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	if !st.IsDir() {
-		return nil, syscall.ENOTDIR
+		return nil, iodine.New(syscall.ENOTDIR, nil)
 	}
 	d := disk{
 		root:       diskPath,
@@ -58,7 +60,7 @@ func NewDisk(diskPath string, diskOrder int) (Disk, error) {
 		d.filesystem["MountPoint"] = d.root
 		return d, nil
 	}
-	return nil, errors.New("unsupported filesystem")
+	return nil, iodine.New(errors.New("unsupported filesystem"), nil)
 }
 
 func (d disk) GetPath() string {
@@ -87,7 +89,7 @@ func (d disk) MakeDir(dirname string) error {
 func (d disk) ListDir(dirname string) ([]os.FileInfo, error) {
 	contents, err := ioutil.ReadDir(path.Join(d.root, dirname))
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	var directories []os.FileInfo
 	for _, content := range contents {
@@ -102,7 +104,7 @@ func (d disk) ListDir(dirname string) ([]os.FileInfo, error) {
 func (d disk) ListFiles(dirname string) ([]os.FileInfo, error) {
 	contents, err := ioutil.ReadDir(path.Join(d.root, dirname))
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	var files []os.FileInfo
 	for _, content := range contents {
@@ -116,35 +118,27 @@ func (d disk) ListFiles(dirname string) ([]os.FileInfo, error) {
 
 func (d disk) MakeFile(filename string) (*os.File, error) {
 	if filename == "" {
-		return nil, errors.New("Invalid argument")
+		return nil, iodine.New(errors.New("Invalid argument"), nil)
 	}
 	filePath := path.Join(d.root, filename)
 	// Create directories if they don't exist
 	if err := os.MkdirAll(path.Dir(filePath), 0700); err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	dataFile, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	return dataFile, nil
 }
 
 func (d disk) OpenFile(filename string) (*os.File, error) {
 	if filename == "" {
-		return nil, errors.New("Invalid argument")
+		return nil, iodine.New(errors.New("Invalid argument"), nil)
 	}
 	dataFile, err := os.Open(path.Join(d.root, filename))
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	return dataFile, nil
 }
-
-func (d disk) SaveConfig() error {
-	return errors.New("Not Implemented")
-}
-
-func (d disk) LoadConfig() error {
-	return errors.New("Not Implemented")
-}

Godeps/_workspace/src/github.com/minio-io/donut/donut.go

@@ -16,7 +16,11 @@
 
 package donut
 
-import "errors"
+import (
+	"errors"
+
+	"github.com/minio-io/iodine"
+)
 
 type donut struct {
 	name    string
@@ -24,28 +28,34 @@ type donut struct {
 	nodes   map[string]Node
 }
 
+const (
+	donutObjectMetadataConfig = "donutObjectMetadata.json"
+	objectMetadataConfig      = "objectMetadata.json"
+	donutConfig               = "donutMetadata.json"
+)
+
 // attachDonutNode - wrapper function to instantiate a new node for associated donut
 // based on the configuration
 func (d donut) attachDonutNode(hostname string, disks []string) error {
 	node, err := NewNode(hostname)
 	if err != nil {
-		return err
+		return iodine.New(err, nil)
 	}
 	for i, disk := range disks {
 		// Order is necessary for maps, keep order number separately
 		newDisk, err := NewDisk(disk, i)
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		if err := newDisk.MakeDir(d.name); err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		if err := node.AttachDisk(newDisk); err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 	}
 	if err := d.AttachNode(node); err != nil {
-		return err
+		return iodine.New(err, nil)
 	}
 	return nil
 }
@@ -53,7 +63,7 @@ func (d donut) attachDonutNode(hostname string, disks []string) error {
 // NewDonut - instantiate a new donut
 func NewDonut(donutName string, nodeDiskMap map[string][]string) (Donut, error) {
 	if donutName == "" || len(nodeDiskMap) == 0 {
-		return nil, errors.New("invalid argument")
+		return nil, iodine.New(errors.New("invalid argument"), nil)
 	}
 	nodes := make(map[string]Node)
 	buckets := make(map[string]Bucket)
@@ -64,11 +74,11 @@ func NewDonut(donutName string, nodeDiskMap map[string][]string) (Donut, error)
 	}
 	for k, v := range nodeDiskMap {
 		if len(v) == 0 {
-			return nil, errors.New("invalid number of disks per node")
+			return nil, iodine.New(errors.New("invalid number of disks per node"), nil)
 		}
 		err := d.attachDonutNode(k, v)
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 	}
 	return d, nil

Godeps/_workspace/src/github.com/minio-io/donut/donut_test.go

@@ -2,6 +2,8 @@ package donut
 
 import (
 	"bytes"
+	"crypto/md5"
+	"encoding/hex"
 	"io"
 	"io/ioutil"
 	"os"
@@ -122,10 +124,42 @@ func (s *MySuite) TestNewObjectFailsWithoutBucket(c *C) {
 	defer os.RemoveAll(root)
 	donut, err := NewDonut("test", createTestNodeDiskMap(root))
 	c.Assert(err, IsNil)
-	err = donut.PutObject("foo", "obj", nil, nil)
+	err = donut.PutObject("foo", "obj", "", nil, nil)
 	c.Assert(err, Not(IsNil))
 }
 
+func (s *MySuite) TestNewObjectMetadata(c *C) {
+	root, err := ioutil.TempDir(os.TempDir(), "donut-")
+	c.Assert(err, IsNil)
+	defer os.RemoveAll(root)
+	donut, err := NewDonut("test", createTestNodeDiskMap(root))
+	c.Assert(err, IsNil)
+
+	metadata := make(map[string]string)
+	metadata["contentType"] = "application/json"
+	metadata["foo"] = "value1"
+	metadata["hello"] = "world"
+
+	data := "Hello World"
+	hasher := md5.New()
+	hasher.Write([]byte(data))
+	expectedMd5Sum := hex.EncodeToString(hasher.Sum(nil))
+	reader := ioutil.NopCloser(bytes.NewReader([]byte(data)))
+
+	err = donut.MakeBucket("foo")
+	c.Assert(err, IsNil)
+
+	err = donut.PutObject("foo", "obj", expectedMd5Sum, reader, metadata)
+	c.Assert(err, IsNil)
+
+	objectMetadata, err := donut.GetObjectMetadata("foo", "obj")
+	c.Assert(err, IsNil)
+
+	c.Assert(objectMetadata["contentType"], Equals, metadata["contentType"])
+	c.Assert(objectMetadata["foo"], Equals, metadata["foo"])
+	c.Assert(objectMetadata["hello"], Equals, metadata["hello"])
+}
+
 func (s *MySuite) TestNewObjectFailsWithEmptyName(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
@@ -133,10 +167,10 @@ func (s *MySuite) TestNewObjectFailsWithEmptyName(c *C) {
 	donut, err := NewDonut("test", createTestNodeDiskMap(root))
 	c.Assert(err, IsNil)
 
-	err = donut.PutObject("foo", "", nil, nil)
+	err = donut.PutObject("foo", "", "", nil, nil)
 	c.Assert(err, Not(IsNil))
 
-	err = donut.PutObject("foo", " ", nil, nil)
+	err = donut.PutObject("foo", " ", "", nil, nil)
 	c.Assert(err, Not(IsNil))
 }
 
@@ -152,11 +186,14 @@ func (s *MySuite) TestNewObjectCanBeWritten(c *C) {
 
 	metadata := make(map[string]string)
 	metadata["contentType"] = "application/octet-stream"
-
 	data := "Hello World"
+
+	hasher := md5.New()
+	hasher.Write([]byte(data))
+	expectedMd5Sum := hex.EncodeToString(hasher.Sum(nil))
 	reader := ioutil.NopCloser(bytes.NewReader([]byte(data)))
 
-	err = donut.PutObject("foo", "obj", reader, metadata)
+	err = donut.PutObject("foo", "obj", expectedMd5Sum, reader, metadata)
 	c.Assert(err, IsNil)
 
 	reader, size, err := donut.GetObject("foo", "obj")
@@ -170,8 +207,9 @@ func (s *MySuite) TestNewObjectCanBeWritten(c *C) {
 
 	actualMetadata, err := donut.GetObjectMetadata("foo", "obj")
 	c.Assert(err, IsNil)
-	c.Assert("b10a8db164e0754105b7a99be72e3fe5", Equals, actualMetadata["md5"])
+	c.Assert(expectedMd5Sum, Equals, actualMetadata["md5"])
 	c.Assert("11", Equals, actualMetadata["size"])
+	c.Assert("1.0", Equals, actualMetadata["version"])
 	_, err = time.Parse(time.RFC3339Nano, actualMetadata["created"])
 	c.Assert(err, IsNil)
 }
@@ -186,11 +224,11 @@ func (s *MySuite) TestMultipleNewObjects(c *C) {
 	c.Assert(donut.MakeBucket("foo"), IsNil)
 
 	one := ioutil.NopCloser(bytes.NewReader([]byte("one")))
-	err = donut.PutObject("foo", "obj1", one, nil)
+	err = donut.PutObject("foo", "obj1", "", one, nil)
 	c.Assert(err, IsNil)
 
 	two := ioutil.NopCloser(bytes.NewReader([]byte("two")))
-	err = donut.PutObject("foo", "obj2", two, nil)
+	err = donut.PutObject("foo", "obj2", "", two, nil)
 	c.Assert(err, IsNil)
 
 	obj1, size, err := donut.GetObject("foo", "obj1")
@@ -223,7 +261,7 @@ func (s *MySuite) TestMultipleNewObjects(c *C) {
 	c.Assert(listObjects, DeepEquals, []string{"obj1", "obj2"})
 
 	three := ioutil.NopCloser(bytes.NewReader([]byte("three")))
-	err = donut.PutObject("foo", "obj3", three, nil)
+	err = donut.PutObject("foo", "obj3", "", three, nil)
 	c.Assert(err, IsNil)
 
 	obj3, size, err := donut.GetObject("foo", "obj3")

Godeps/_workspace/src/github.com/minio-io/donut/erasure.go

@@ -18,8 +18,10 @@ package donut
 
 import (
 	"errors"
+	"strconv"
 
 	encoding "github.com/minio-io/erasure"
+	"github.com/minio-io/iodine"
 )
 
 type encoder struct {
@@ -36,20 +38,25 @@ func getErasureTechnique(technique string) (encoding.Technique, error) {
 	case technique == "Vandermonde":
 		return encoding.Cauchy, nil
 	default:
-		return encoding.None, errors.New("Invalid erasure technique")
+		return encoding.None, iodine.New(errors.New("Invalid erasure technique"), nil)
 	}
 }
 
 // NewEncoder - instantiate a new encoder
 func NewEncoder(k, m uint8, technique string) (Encoder, error) {
+	errParams := map[string]string{
+		"k":         strconv.FormatUint(uint64(k), 10),
+		"m":         strconv.FormatUint(uint64(m), 10),
+		"technique": technique,
+	}
 	e := encoder{}
 	t, err := getErasureTechnique(technique)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, errParams)
 	}
 	params, err := encoding.ValidateParams(k, m, t)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, errParams)
 	}
 	e.encoder = encoding.NewErasure(params)
 	e.k = k
@@ -59,19 +66,19 @@ func NewEncoder(k, m uint8, technique string) (Encoder, error) {
 }
 
 func (e encoder) GetEncodedBlockLen(dataLength int) (int, error) {
-	if dataLength == 0 {
-		return 0, errors.New("invalid argument")
+	if dataLength <= 0 {
+		return 0, iodine.New(errors.New("invalid argument"), nil)
 	}
 	return encoding.GetEncodedBlockLen(dataLength, e.k), nil
 }
 
 func (e encoder) Encode(data []byte) (encodedData [][]byte, err error) {
 	if data == nil {
-		return nil, errors.New("invalid argument")
+		return nil, iodine.New(errors.New("invalid argument"), nil)
 	}
 	encodedData, err = e.encoder.Encode(data)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	return encodedData, nil
 }
@@ -79,7 +86,7 @@ func (e encoder) Encode(data []byte) (encodedData [][]byte, err error) {
 func (e encoder) Decode(encodedData [][]byte, dataLength int) (data []byte, err error) {
 	decodedData, err := e.encoder.Decode(encodedData, dataLength)
 	if err != nil {
-		return nil, err
+		return nil, iodine.New(err, nil)
 	}
 	return decodedData, nil
 }

Godeps/_workspace/src/github.com/minio-io/donut/interfaces.go

@@ -43,7 +43,7 @@ type ObjectStorage interface {
 	// Object Operations
 	GetObject(bucket, object string) (io.ReadCloser, int64, error)
 	GetObjectMetadata(bucket, object string) (map[string]string, error)
-	PutObject(bucket, object string, reader io.ReadCloser, metadata map[string]string) error
+	PutObject(bucket, object, expectedMD5Sum string, reader io.ReadCloser, metadata map[string]string) error
 }
 
 // Management is a donut management system interface
@@ -71,12 +71,13 @@ type Bucket interface {
 	ListObjects() (map[string]Object, error)
 
 	GetObject(object string) (io.ReadCloser, int64, error)
-	PutObject(object string, contents io.Reader, metadata map[string]string) error
+	PutObject(object string, contents io.Reader, expectedMD5Sum string, metadata map[string]string) error
 }
 
 // Object interface
 type Object interface {
 	GetObjectMetadata() (map[string]string, error)
+	GetDonutObjectMetadata() (map[string]string, error)
 }
 
 // Node interface
@@ -104,8 +105,3 @@ type Disk interface {
 	GetOrder() int
 	GetFSInfo() map[string]string
 }
-
-const (
-	objectMetadataConfig = "objectMetadata.json"
-	donutConfig          = "donutMetadata.json"
-)

Godeps/_workspace/src/github.com/minio-io/donut/management.go

@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"errors"
 	"path"
+
+	"github.com/minio-io/iodine"
 )
 
 func (d donut) Heal() error {
@@ -15,7 +17,7 @@ func (d donut) Info() (nodeDiskMap map[string][]string, err error) {
 	for nodeName, node := range d.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return nil, err
+			return nil, iodine.New(err, nil)
 		}
 		diskList := make([]string, len(disks))
 		for diskName, disk := range disks {
@@ -28,7 +30,7 @@ func (d donut) Info() (nodeDiskMap map[string][]string, err error) {
 
 func (d donut) AttachNode(node Node) error {
 	if node == nil {
-		return errors.New("invalid argument")
+		return iodine.New(errors.New("invalid argument"), nil)
 	}
 	d.nodes[node.GetNodeName()] = node
 	return nil
@@ -43,19 +45,19 @@ func (d donut) SaveConfig() error {
 	for hostname, node := range d.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		for _, disk := range disks {
 			donutConfigPath := path.Join(d.name, donutConfig)
 			donutConfigWriter, err := disk.MakeFile(donutConfigPath)
 			defer donutConfigWriter.Close()
 			if err != nil {
-				return err
+				return iodine.New(err, nil)
 			}
 			nodeDiskMap[hostname][disk.GetOrder()] = disk.GetPath()
 			jenc := json.NewEncoder(donutConfigWriter)
 			if err := jenc.Encode(nodeDiskMap); err != nil {
-				return err
+				return iodine.New(err, nil)
 			}
 		}
 	}

Godeps/_workspace/src/github.com/minio-io/donut/node.go

@@ -18,6 +18,8 @@ package donut
 
 import (
 	"errors"
+
+	"github.com/minio-io/iodine"
 )
 
 type node struct {
@@ -28,7 +30,7 @@ type node struct {
 // NewNode - instantiates a new node
 func NewNode(hostname string) (Node, error) {
 	if hostname == "" {
-		return nil, errors.New("invalid argument")
+		return nil, iodine.New(errors.New("invalid argument"), nil)
 	}
 	disks := make(map[string]Disk)
 	n := node{
@@ -48,7 +50,7 @@ func (n node) ListDisks() (map[string]Disk, error) {
 
 func (n node) AttachDisk(disk Disk) error {
 	if disk == nil {
-		return errors.New("Invalid argument")
+		return iodine.New(errors.New("Invalid argument"), nil)
 	}
 	n.disks[disk.GetPath()] = disk
 	return nil

Godeps/_workspace/src/github.com/minio-io/donut/object.go

@@ -25,9 +25,10 @@ import (
 )
 
 type object struct {
-	name           string
-	objectPath     string
-	objectMetadata map[string]string
+	name                string
+	objectPath          string
+	objectMetadata      map[string]string
+	donutObjectMetadata map[string]string
 }
 
 // NewObject - instantiate a new object
@@ -51,5 +52,18 @@ func (o object) GetObjectMetadata() (map[string]string, error) {
 		return nil, err
 	}
 	o.objectMetadata = objectMetadata
-	return objectMetadata, nil
+	return o.objectMetadata, nil
+}
+
+func (o object) GetDonutObjectMetadata() (map[string]string, error) {
+	donutObjectMetadata := make(map[string]string)
+	donutObjectMetadataBytes, err := ioutil.ReadFile(path.Join(o.objectPath, donutObjectMetadataConfig))
+	if err != nil {
+		return nil, err
+	}
+	if err := json.Unmarshal(donutObjectMetadataBytes, &donutObjectMetadata); err != nil {
+		return nil, err
+	}
+	o.donutObjectMetadata = donutObjectMetadata
+	return o.donutObjectMetadata, nil
 }

Godeps/_workspace/src/github.com/minio-io/donut/objectstorage.go

@@ -109,7 +109,7 @@ func (d donut) ListObjects(bucket, prefix, marker, delimiter string, maxkeys int
 	return results, commonPrefixes, isTruncated, nil
 }
 
-func (d donut) PutObject(bucket, object string, reader io.ReadCloser, metadata map[string]string) error {
+func (d donut) PutObject(bucket, object, expectedMD5Sum string, reader io.ReadCloser, metadata map[string]string) error {
 	errParams := map[string]string{
 		"bucket": bucket,
 		"object": object,
@@ -127,7 +127,7 @@ func (d donut) PutObject(bucket, object string, reader io.ReadCloser, metadata m
 	if _, ok := d.buckets[bucket]; !ok {
 		return iodine.New(errors.New("bucket does not exist"), nil)
 	}
-	err = d.buckets[bucket].PutObject(object, reader, metadata)
+	err = d.buckets[bucket].PutObject(object, reader, expectedMD5Sum, metadata)
 	if err != nil {
 		return iodine.New(err, errParams)
 	}

Godeps/_workspace/src/github.com/minio-io/donut/objectstorage_internal.go

@@ -6,6 +6,8 @@ import (
 	"path"
 	"sort"
 	"strings"
+
+	"github.com/minio-io/iodine"
 )
 
 func appendUniq(slice []string, i string) []string {
@@ -80,27 +82,27 @@ func uniqueObjects(objects []string) []string {
 func (d donut) makeBucket(bucketName string) error {
 	err := d.getAllBuckets()
 	if err != nil {
-		return err
+		return iodine.New(err, nil)
 	}
 	if _, ok := d.buckets[bucketName]; ok {
-		return errors.New("bucket exists")
+		return iodine.New(errors.New("bucket exists"), nil)
 	}
 	bucket, err := NewBucket(bucketName, d.name, d.nodes)
 	if err != nil {
-		return err
+		return iodine.New(err, nil)
 	}
 	nodeNumber := 0
 	d.buckets[bucketName] = bucket
 	for _, node := range d.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		for _, disk := range disks {
 			bucketSlice := fmt.Sprintf("%s$%d$%d", bucketName, nodeNumber, disk.GetOrder())
 			err := disk.MakeDir(path.Join(d.name, bucketSlice))
 			if err != nil {
-				return err
+				return iodine.New(err, nil)
 			}
 		}
 		nodeNumber = nodeNumber + 1
@@ -112,23 +114,23 @@ func (d donut) getAllBuckets() error {
 	for _, node := range d.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		for _, disk := range disks {
 			dirs, err := disk.ListDir(d.name)
 			if err != nil {
-				return err
+				return iodine.New(err, nil)
 			}
 			for _, dir := range dirs {
 				splitDir := strings.Split(dir.Name(), "$")
 				if len(splitDir) < 3 {
-					return errors.New("corrupted backend")
+					return iodine.New(errors.New("corrupted backend"), nil)
 				}
 				bucketName := splitDir[0]
 				// we dont need this NewBucket once we cache these
 				bucket, err := NewBucket(bucketName, d.name, d.nodes)
 				if err != nil {
-					return err
+					return iodine.New(err, nil)
 				}
 				d.buckets[bucketName] = bucket
 			}

Godeps/_workspace/src/github.com/minio-io/donut/rebalance.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"os"
 	"strings"
+
+	"github.com/minio-io/iodine"
 )
 
 func (d donut) Rebalance() error {
@@ -13,14 +15,14 @@ func (d donut) Rebalance() error {
 	for _, node := range d.nodes {
 		disks, err := node.ListDisks()
 		if err != nil {
-			return err
+			return iodine.New(err, nil)
 		}
 		totalOffSetLength = len(disks)
 		fmt.Println(totalOffSetLength)
 		for _, disk := range disks {
 			dirs, err := disk.ListDir(d.name)
 			if err != nil {
-				return err
+				return iodine.New(err, nil)
 			}
 			if len(dirs) == 0 {
 				newDisks = append(newDisks, disk)

Godeps/_workspace/src/github.com/minio-io/objectdriver/Godeps/Godeps.json

@@ -11,7 +11,7 @@
 		},
 		{
 			"ImportPath": "github.com/minio-io/donut",
-			"Rev": "9d0c663a857103c780414e15d7e426c6fca9984e"
+			"Rev": "4b20a97ea6d1fd4744ae06774e4c0092a67dafb5"
 		},
 		{
 			"ImportPath": "github.com/minio-io/erasure",

Godeps/_workspace/src/github.com/minio-io/objectdriver/donut/donut.go

@@ -17,6 +17,8 @@
 package donut
 
 import (
+	"encoding/base64"
+	"encoding/hex"
 	"errors"
 	"io"
 	"os"
@@ -297,7 +299,7 @@ func (d donutDriver) ListObjects(bucketName string, resources drivers.BucketReso
 }
 
 // CreateObject creates a new object
-func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedMd5sum string, reader io.Reader) error {
+func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedMD5Sum string, reader io.Reader) error {
 	errParams := map[string]string{
 		"bucketName":  bucketName,
 		"objectName":  objectName,
@@ -313,11 +315,17 @@ func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedM
 		contentType = "application/octet-stream"
 	}
 	metadata := make(map[string]string)
-	metadata["contentType"] = contentType
-	if strings.TrimSpace(expectedMd5sum) != "" {
-		metadata["expectedMd5sum"] = expectedMd5sum
+	metadata["contentType"] = strings.TrimSpace(contentType)
+
+	if strings.TrimSpace(expectedMD5Sum) != "" {
+		expectedMD5SumBytes, err := base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
+		if err != nil {
+			return iodine.New(err, nil)
+		}
+		expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
 	}
-	err := d.donut.PutObject(bucketName, objectName, ioutil.NopCloser(reader), metadata)
+
+	err := d.donut.PutObject(bucketName, objectName, expectedMD5Sum, ioutil.NopCloser(reader), metadata)
 	if err != nil {
 		return iodine.New(err, errParams)
 	}