Metadata and writing the object are now both committed together.

pkg/donutbox/donutbox.go

@@ -14,13 +14,58 @@ type DonutBox interface {
 	SetBucketMetadata(bucket string, metadata map[string]string) error
 
 	// object operations
-	GetObjectWriter(bucket, object string, column, blockSize uint) *io.PipeWriter
-	GetObjectReader(bucket, object string, column int) (io.Reader, error)
-	SetObjectMetadata(bucket, object string, metadata map[string]string) error
-	GetObjectMetadata(bucket, object string) (map[string]string, error)
+	GetObjectWriter(bucket, object string, column, blockSize uint) (*NewObject, error)
+	GetObjectReader(bucket, object string, column uint) (io.Reader, error)
+	GetObjectMetadata(bucket, object string, column uint) (map[string]string, error)
 }
 
 // Result is a result for async tasks
 type Result struct {
 	Err error
 }
+
+// CreateNewObject creates a new object wrapping a writer. Clients are not expected to use this directly. This is exposed for storage drivers.
+func CreateNewObject(writer *io.PipeWriter) *NewObject {
+	return &NewObject{writer: writer}
+}
+
+// NewObject wraps a writer and allows setting metadata. On a successful close, the object is committed by the backend.
+type NewObject struct {
+	metadata map[string]string
+	writer   *io.PipeWriter
+}
+
+// Write data
+func (newObject *NewObject) Write(data []byte) (int, error) {
+	return newObject.writer.Write(data)
+}
+
+// SetMetadata sets metadata for an object
+func (newObject *NewObject) SetMetadata(metadata map[string]string) {
+	newMetadata := make(map[string]string)
+	for k, v := range metadata {
+		newMetadata[k] = v
+	}
+	newObject.metadata = newMetadata
+}
+
+// Close and commit the object
+func (newObject *NewObject) Close() error {
+	return newObject.writer.Close()
+}
+
+// CloseWithError closes the object with an error, causing the backend to abandon the object
+func (newObject *NewObject) CloseWithError(err error) error {
+	return newObject.writer.CloseWithError(err)
+}
+
+// GetMetadata returns a copy of the metadata set metadata
+func (newObject *NewObject) GetMetadata() map[string]string {
+	newMetadata := make(map[string]string)
+	if newMetadata != nil {
+		for k, v := range newObject.metadata {
+			newMetadata[k] = v
+		}
+	}
+	return newMetadata
+}

pkg/donutbox/donutmem/donutmem.go

@@ -74,11 +74,16 @@ func (donutMem donutMem) ListObjectsInBucket(bucketKey, prefixKey string) ([]str
 	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
 		curBucket.lock.RLock()
 		defer curBucket.lock.RUnlock()
-		var objects []string
+		objectMap := make(map[string]string)
 		for objectKey := range curBucket.objects {
-			if strings.HasPrefix(objectKey, prefixKey) {
-				objects = append(objects, objectKey)
+			objectName := strings.Split(objectKey, "#")[0]
+			if strings.HasPrefix(objectName, prefixKey) {
+				objectMap[objectName] = objectName
+			}
 		}
+		var objects []string
+		for k := range objectMap {
+			objects = append(objects, k)
 		}
 		return objects, nil
 	}
@@ -118,23 +123,19 @@ func (donutMem donutMem) SetBucketMetadata(bucketKey string, metadata map[string
 }
 
 // object operations
-func (donutMem donutMem) GetObjectWriter(bucket, key string, column uint, blockSize uint) *io.PipeWriter {
+func (donutMem donutMem) GetObjectWriter(bucketKey, objectKey string, column uint, blockSize uint) (*donutbox.NewObject, error) {
+	key := getKey(bucketKey, objectKey, column)
 	reader, writer := io.Pipe()
+	returnObject := donutbox.CreateNewObject(writer)
 	donutMem.lock.RLock()
 	defer donutMem.lock.RUnlock()
-	if curBucket, ok := donutMem.buckets[bucket]; ok {
+	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
 		curBucket.lock.Lock()
 		defer curBucket.lock.Unlock()
 		if _, ok := curBucket.objects[key]; !ok {
-			// create object
-			metadata := make(map[string]string)
-			metadata["key"] = key
-			metadata["blockSize"] = strconv.FormatInt(int64(blockSize), 10)
-
 			newObject := object{
 				name: key,
 				data: make([]byte, 0),
-				metadata: metadata,
 				lock: new(sync.RWMutex),
 			}
 
@@ -143,33 +144,45 @@ func (donutMem donutMem) GetObjectWriter(bucket, key string, column uint, blockS
 			go func() {
 				defer newObject.lock.Unlock()
 				var objBuffer bytes.Buffer
+
 				_, err := io.Copy(&objBuffer, reader)
 				if err == nil {
 					newObject.data = objBuffer.Bytes()
 					writer.Close()
-				} else {
+
+					metadata := returnObject.GetMetadata()
+					for k, v := range metadata {
+						metadata[k] = v
+					}
+					metadata["key"] = objectKey
+					metadata["column"] = strconv.FormatUint(uint64(column), 10)
+					newObject.metadata = metadata
+
+					return
+				}
+
 				donutMem.lock.RLock()
 				defer donutMem.lock.RUnlock()
-					bucket, _ := donutMem.buckets[bucket]
+				bucket, _ := donutMem.buckets[bucketKey]
 				bucket.lock.Lock()
 				defer bucket.lock.Unlock()
 				delete(bucket.objects, key)
 				writer.CloseWithError(err)
-				}
 			}()
-			return writer
+			return returnObject, nil
 		}
 		writer.CloseWithError(errors.New("Object exists"))
-		return writer
+		return nil, errors.New("Object exists")
 	}
 	writer.CloseWithError(errors.New("Bucket does not exist"))
-	return writer
+	return nil, errors.New("Bucket does not exist")
 }
 
-func (donutMem donutMem) GetObjectReader(bucket, key string, column int) (io.Reader, error) {
+func (donutMem donutMem) GetObjectReader(bucketKey, objectKey string, column uint) (io.Reader, error) {
+	key := getKey(bucketKey, objectKey, column)
 	donutMem.lock.RLock()
 	defer donutMem.lock.RUnlock()
-	if curBucket, ok := donutMem.buckets[bucket]; ok {
+	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
 		curBucket.lock.RLock()
 		defer curBucket.lock.RUnlock()
 		if curObject, ok := curBucket.objects[key]; ok {
@@ -182,35 +195,37 @@ func (donutMem donutMem) GetObjectReader(bucket, key string, column int) (io.Rea
 	return nil, errors.New("Bucket not found")
 }
 
-func (donutMem donutMem) SetObjectMetadata(bucketKey, objectKey string, metadata map[string]string) error {
-	donutMem.lock.RLock()
-	defer donutMem.lock.RUnlock()
-	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
-		curBucket.lock.RLock()
-		defer curBucket.lock.RUnlock()
-		if curObject, ok := curBucket.objects[objectKey]; ok {
-			curObject.lock.Lock()
-			defer curObject.lock.Unlock()
-			newMetadata := make(map[string]string)
-			for k, v := range metadata {
-				newMetadata[k] = v
-			}
-			curObject.metadata = newMetadata
-			return nil
-		}
-		return errors.New("Object not found")
-	}
-	return errors.New("Bucket not found")
-}
-
-func (donutMem donutMem) GetObjectMetadata(bucketKey, objectKey string) (map[string]string, error) {
+//func (donutMem donutMem) SetObjectMetadata(bucketKey, objectKey string, column uint, metadata map[string]string) error {
+//	key := getKey(bucketKey, objectKey, column)
+//	donutMem.lock.RLock()
+//	defer donutMem.lock.RUnlock()
+//	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
+//		curBucket.lock.RLock()
+//		defer curBucket.lock.RUnlock()
+//		if curObject, ok := curBucket.objects[key]; ok {
+//			curObject.lock.Lock()
+//			defer curObject.lock.Unlock()
+//			newMetadata := make(map[string]string)
+//			for k, v := range metadata {
+//				newMetadata[k] = v
+//			}
+//			curObject.metadata = newMetadata
+//			return nil
+//		}
+//		return errors.New("Object not found")
+//	}
+//	return errors.New("Bucket not found")
+//}
+
+func (donutMem donutMem) GetObjectMetadata(bucketKey, objectKey string, column uint) (map[string]string, error) {
+	key := getKey(bucketKey, objectKey, column)
 	donutMem.lock.RLock()
 	defer donutMem.lock.RUnlock()
 
 	if curBucket, ok := donutMem.buckets[bucketKey]; ok {
 		curBucket.lock.RLock()
 		defer curBucket.lock.RUnlock()
-		if curObject, ok := curBucket.objects[objectKey]; ok {
+		if curObject, ok := curBucket.objects[key]; ok {
 			curObject.lock.RLock()
 			defer curObject.lock.RUnlock()
 			result := make(map[string]string)
@@ -223,3 +238,7 @@ func (donutMem donutMem) GetObjectMetadata(bucketKey, objectKey string) (map[str
 	}
 	return nil, errors.New("Bucket not found")
 }
+
+func getKey(bucketKey, objectKey string, column uint) string {
+	return objectKey + "#" + strconv.FormatUint(uint64(column), 10)
+}

pkg/donutbox/donutmem/donutmem_test.go

@@ -19,15 +19,16 @@ func (s *MySuite) TestCreateAndReadObject(c *C) {
 	data := "Hello World"
 	donut := NewDonutMem()
 
-	writer := donut.GetObjectWriter("foo", "bar", 0, 2)
-	count, err := writer.Write([]byte("hello"))
+	writer, err := donut.GetObjectWriter("foo", "bar", 0, 2)
+	c.Assert(writer, IsNil)
 	c.Assert(err, Not(IsNil))
 
 	err = donut.CreateBucket("foo")
 	c.Assert(err, IsNil)
 
-	writer = donut.GetObjectWriter("foo", "bar", 0, 2)
-	count, err = writer.Write([]byte(data))
+	writer, err = donut.GetObjectWriter("foo", "bar", 0, 2)
+	c.Assert(err, IsNil)
+	count, err := writer.Write([]byte(data))
 	c.Assert(count, Equals, len(data))
 	c.Assert(err, IsNil)
 	err = writer.Close()
@@ -40,13 +41,8 @@ func (s *MySuite) TestCreateAndReadObject(c *C) {
 	c.Assert(result, DeepEquals, []byte(data))
 
 	// try writing, should see error
-	writer = donut.GetObjectWriter("foo", "bar", 0, 2)
-	count, err = writer.Write([]byte("different data"))
-	c.Assert(count, Equals, 0)
-	c.Assert(err, Not(IsNil))
-	// try again, should see error
-	count, err = writer.Write([]byte("different data"))
-	c.Assert(count, Equals, 0)
+	writer, err = donut.GetObjectWriter("foo", "bar", 0, 2)
+	c.Assert(writer, IsNil)
 	c.Assert(err, Not(IsNil))
 
 	// data should not change
@@ -87,7 +83,8 @@ func (s *MySuite) TestObjectList(c *C) {
 	for i := 0; i < 10; i++ {
 		object := "foo" + strconv.Itoa(i)
 		objects = append(objects, object)
-		writer := donut.GetObjectWriter("foo", object, 0, 2)
+		writer, err := donut.GetObjectWriter("foo", object, 0, 2)
+		c.Assert(err, IsNil)
 		writer.Write([]byte(object))
 		writer.Close()
 		c.Assert(err, IsNil)
@@ -125,24 +122,31 @@ func (s *MySuite) TestObjectMetadata(c *C) {
 	metadata["hello"] = "world"
 	metadata["foo"] = "bar"
 
-	err := donut.SetObjectMetadata("foo", "bar", metadata)
-	c.Assert(err, Not(IsNil))
-
-	result, err := donut.GetObjectMetadata("foo", "bar")
+	result, err := donut.GetObjectMetadata("foo", "bar", 1)
 	c.Assert(result, IsNil)
 	c.Assert(err, Not(IsNil))
 
-	writer := donut.GetObjectWriter("foo", "bar", 0, 2)
+	writer, err := donut.GetObjectWriter("foo", "bar", 1, 2)
+	c.Assert(err, IsNil)
 	_, err = writer.Write([]byte("Hello World"))
 	c.Assert(err, IsNil)
+	writer.SetMetadata(metadata)
 	err = writer.Close()
 	c.Assert(err, IsNil)
 
-	err = donut.SetObjectMetadata("foo", "bar", metadata)
-	c.Assert(err, IsNil)
+	expectedMetadata := make(map[string]string)
+	for k, v := range metadata {
+		expectedMetadata[k] = v
+	}
+	expectedMetadata["key"] = "bar"
+	expectedMetadata["column"] = "1"
 
-	result, err = donut.GetObjectMetadata("foo", "bar")
+	result, err = donut.GetObjectMetadata("foo", "bar", 1)
 	c.Assert(err, IsNil)
-	c.Assert(result, DeepEquals, metadata)
+	c.Assert(result, DeepEquals, expectedMetadata)
+
+	result, err = donut.GetObjectMetadata("foo", "bar", 0)
+	c.Assert(err, Not(IsNil))
+	c.Assert(result, IsNil)
 
 }

pkg/storage/encoded/encoded.go

@@ -19,8 +19,11 @@ package encoded
 import (
 	"errors"
 	"github.com/minio-io/minio/pkg/donutbox"
+	"github.com/minio-io/minio/pkg/encoding/erasure"
 	"github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/utils/split"
 	"io"
+	"strconv"
 )
 
 // StorageDriver creates a new single disk storage driver using donut without encoding.
@@ -83,6 +86,68 @@ func (diskStorage StorageDriver) ListObjects(bucket string, resources storage.Bu
 }
 
 // CreateObject creates a new object
-func (diskStorage StorageDriver) CreateObject(bucket string, key string, contentType string, data io.Reader) error {
-	return errors.New("Not Implemented")
+func (diskStorage StorageDriver) CreateObject(bucketKey string, objectKey string, contentType string, reader io.Reader) error {
+	blockSize := 10 * 1024 * 1024
+	// split stream
+	splitStream := split.Stream(reader, uint64(blockSize))
+	writers := make([]*donutbox.NewObject, 16)
+	for i := 0; i < 16; i++ {
+		newWriter, err := diskStorage.donutBox.GetObjectWriter(bucketKey, objectKey, uint(i), uint(blockSize))
+		if err != nil {
+			closeAllWritersWithError(writers, err)
+			return err
+		}
+		writers[i] = newWriter
+	}
+	totalLength := uint64(0)
+	for chunk := range splitStream {
+		params, err := erasure.ParseEncoderParams(8, 8, erasure.Cauchy)
+		if err != nil {
+			return err
+		}
+		totalLength = totalLength + uint64(len(chunk.Data))
+		encoder := erasure.NewEncoder(params)
+		if chunk.Err == nil {
+			parts, _ := encoder.Encode(chunk.Data)
+			for index, part := range parts {
+				if _, err := writers[index].Write(part); err != nil {
+					closeAllWritersWithError(writers, err)
+					return err
+				}
+			}
+		} else {
+			closeAllWritersWithError(writers, chunk.Err)
+			return chunk.Err
+		}
+		// encode data
+		// write
+	}
+	// close connections
+	closeAllWriters(writers)
+
+	metadata := make(map[string]string)
+	metadata["length"] = strconv.FormatUint(totalLength, 10)
+	metadata["blockSize"] = strconv.FormatUint(uint64(blockSize), 10)
+	//    metadata["md5"] := md5sum
+	for column := uint(0); column < 16; column++ {
+		writers[column].SetMetadata(metadata)
+	}
+
+	return nil
+}
+
+func closeAllWriters(writers []*donutbox.NewObject) {
+	for _, writer := range writers {
+		if writer != nil {
+			writer.Close()
+		}
+	}
+}
+
+func closeAllWritersWithError(writers []*donutbox.NewObject, err error) {
+	for _, writer := range writers {
+		if writer != nil {
+			writer.CloseWithError(err)
+		}
+	}
 }