fsStorage should use appendStorage with offsets

- also takes in 'blockSize' cli option.
 - robustness fixes

Makefile

@@ -32,7 +32,7 @@ build-split: build-strbyteconv
 build-strbyteconv:
 	@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/strbyteconv
 
-build-storage: build-storage-fs build-storage-append build-storage-encoded
+build-storage: build-storage-append build-storage-encoded build-storage-fs
 
 build-storage-fs:
 	@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/storage/fsstorage

cmd/erasure-demo/fs.go

@@ -14,7 +14,7 @@ import (
 func fsGetList(config inputConfig) (io.Reader, error) {
 	var objectStorage storage.ObjectStorage
 	rootDir := path.Join(config.rootDir, config.storageDriver)
-	objectStorage, _ = fsstorage.NewStorage(rootDir)
+	objectStorage, _ = fsstorage.NewStorage(rootDir, config.blockSize)
 	objectList, err := objectStorage.List()
 	if err != nil {
 		return nil, err
@@ -30,7 +30,7 @@ func fsGetList(config inputConfig) (io.Reader, error) {
 func fsGet(config inputConfig, objectPath string) (io.Reader, error) {
 	var objectStorage storage.ObjectStorage
 	rootDir := path.Join(config.rootDir, config.storageDriver)
-	objectStorage, _ = fsstorage.NewStorage(rootDir)
+	objectStorage, _ = fsstorage.NewStorage(rootDir, config.blockSize)
 	object, err := objectStorage.Get(objectPath)
 	if err != nil {
 		return nil, err
@@ -45,7 +45,7 @@ func fsPut(config inputConfig, objectPath string, reader io.Reader) error {
 		return err
 	}
 	var objectStorage storage.ObjectStorage
-	objectStorage, _ = fsstorage.NewStorage(rootDir)
+	objectStorage, _ = fsstorage.NewStorage(rootDir, config.blockSize)
 	if err = objectStorage.Put(objectPath, reader); err != nil {
 		return err
 	}

cmd/erasure-demo/get.go

@@ -46,5 +46,8 @@ func get(c *cli.Context) {
 			log.Fatal("Unknown driver")
 		}
 	}
+	if objectReader == nil {
+		log.Fatal("Object not found")
+	}
 	io.Copy(os.Stdout, objectReader)
 }

cmd/erasure-demo/main.go

@@ -72,6 +72,16 @@ func main() {
 					Value: "erasure",
 					Usage: "erasure",
 				},
+				cli.StringFlag{
+					Name:  "protection-level",
+					Value: "10,6",
+					Usage: "data,parity",
+				},
+				cli.StringFlag{
+					Name:  "block-size",
+					Value: "1M",
+					Usage: "Size of blocks. Examples: 1K, 1M, full",
+				},
 			},
 		},
 		{

pkgs/gateway/gateway.go

@@ -228,7 +228,7 @@ func SimpleEncodedStorageDriver(bucket string, input chan ObjectRequest, config
 }
 
 func SimpleFileStorageDriver(bucket string, input chan ObjectRequest, config GatewayConfig) {
-	fileStorage, _ := fsstorage.NewStorage(config.DataDir)
+	fileStorage, _ := fsstorage.NewStorage(config.DataDir, config.BlockSize)
 	for request := range input {
 		switch request.requestType {
 		case "GET":

pkgs/storage/encodedstorage/encoded_storage.go

@@ -51,6 +51,10 @@ type storeResponse struct {
 
 func NewStorage(rootDir string, k, m int, blockSize uint64) (storage.ObjectStorage, error) {
 	// create storage files
+	if k == 0 || m == 0 {
+		return nil, errors.New("Invalid protection level")
+	}
+
 	storageNodes := make([]storage.ObjectStorage, k+m)
 	for i := 0; i < k+m; i++ {
 		storageNode, err := appendstorage.NewStorage(rootDir, i)
@@ -192,6 +196,10 @@ func (eStorage *encodedStorage) readObject(objectPath string, entry StorageEntry
 	encoder := erasure.NewEncoder(ep)
 	for i, chunk := range entry.Blocks {
 		blockSlices := eStorage.getBlockSlices(objectPath + "$" + strconv.Itoa(i))
+		if len(blockSlices) == 0 {
+			writer.CloseWithError(errors.New("slices missing!!"))
+			return
+		}
 		var blocks [][]byte
 		for _, slice := range blockSlices {
 			if slice.err != nil {

pkgs/storage/fsstorage/fs_storage.go

@@ -1,57 +1,156 @@
 package fsstorage
 
 import (
+	"bytes"
+	"crypto/md5"
+	"encoding/gob"
+	"encoding/hex"
+	"errors"
 	"io"
 	"io/ioutil"
 	"os"
 	"path"
-	"path/filepath"
+	"strconv"
 
+	"github.com/minio-io/minio/pkgs/split"
 	"github.com/minio-io/minio/pkgs/storage"
+	"github.com/minio-io/minio/pkgs/storage/appendstorage"
 )
 
 type fileSystemStorage struct {
-	RootDir string
+	RootDir     string
+	BlockSize   uint64
+	diskStorage []storage.ObjectStorage
+	objects     map[string]StorageEntry
 }
 
-func NewStorage(rootDir string) (storage.ObjectStorage, error) {
+type StorageEntry struct {
+	Path        string
+	Md5sum      []byte
+	ChunkLength int
+}
+
+func NewStorage(rootDir string, blockSize uint64) (storage.ObjectStorage, error) {
+	var storageNodes []storage.ObjectStorage
+	storageNode, err := appendstorage.NewStorage(rootDir, 0)
+	if err != nil {
+		return nil, err
+	}
+	storageNodes = append(storageNodes, storageNode)
+	objects := make(map[string]StorageEntry)
+	indexPath := path.Join(rootDir, "index")
+	if _, err := os.Stat(indexPath); err == nil {
+		indexFile, err := os.Open(indexPath)
+		defer indexFile.Close()
+		if err != nil {
+			return nil, err
+		}
+		encoder := gob.NewDecoder(indexFile)
+		err = encoder.Decode(&objects)
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+	}
 	newStorage := fileSystemStorage{
-		RootDir: rootDir,
+		RootDir:     rootDir,
+		diskStorage: storageNodes,
+		BlockSize:   blockSize,
+		objects:     objects,
 	}
 	return &newStorage, nil
 }
 
 func (fsStorage *fileSystemStorage) List() ([]storage.ObjectDescription, error) {
-	fileInfos, err := ioutil.ReadDir(fsStorage.RootDir)
-	if err != nil {
-		return nil, err
+	var objectDescList []storage.ObjectDescription
+	for objectName, objectEntry := range fsStorage.objects {
+		var objectDescription storage.ObjectDescription
+		objectDescription.Name = objectName
+		objectDescription.Md5sum = hex.EncodeToString(objectEntry.Md5sum)
+		objectDescription.Protectionlevel = ""
+		objectDescList = append(objectDescList, objectDescription)
+	}
+	if len(objectDescList) == 0 {
+		return nil, errors.New("No objects found")
+	}
+	return objectDescList, nil
+}
+
+func (fsStorage *fileSystemStorage) Get(objectPath string) (io.Reader, error) {
+	entry, ok := fsStorage.objects[objectPath]
+	if ok == false {
+		return nil, nil
 	}
+	reader, writer := io.Pipe()
+	go fsStorage.readObject(objectPath, entry, writer)
+	return reader, nil
+}
+
+func (fsStorage *fileSystemStorage) readObject(objectPath string, entry StorageEntry, writer *io.PipeWriter) {
+	appendStorage := fsStorage.diskStorage[0]
+	for i := 0; i < entry.ChunkLength; i++ {
+		chunkObjectPath := objectPath + "$" + strconv.Itoa(i)
+		chunkObject, err := appendStorage.Get(chunkObjectPath)
 
-	var descriptions []storage.ObjectDescription
+		if err != nil {
+			writer.CloseWithError(err)
+		}
+		data, readErr := ioutil.ReadAll(chunkObject)
 
-	for _, fi := range fileInfos {
-		description := storage.ObjectDescription{
-			Name:            fi.Name(),
-			Md5sum:          "",
-			Protectionlevel: "",
+		if readErr != nil {
+			writer.CloseWithError(readErr)
+		}
+		bytesWritten := 0
+		for bytesWritten != len(data) {
+			written, err := writer.Write(data[bytesWritten:len(data)])
+			if err != nil {
+				writer.CloseWithError(err)
+			}
+			bytesWritten += written
 		}
-		descriptions = append(descriptions, description)
 	}
-	return descriptions, nil
+	writer.Close()
 }
 
-func (storage *fileSystemStorage) Get(objectPath string) (io.Reader, error) {
-	return os.Open(path.Join(storage.RootDir, objectPath))
-}
+func (fsStorage *fileSystemStorage) Put(objectPath string, object io.Reader) error {
+	// split
+	chunks := make(chan split.SplitMessage)
+	go split.SplitStream(object, fsStorage.BlockSize, chunks)
 
-func (storage *fileSystemStorage) Put(objectPath string, object io.Reader) error {
-	err := os.MkdirAll(filepath.Dir(path.Join(storage.RootDir, objectPath)), 0700)
-	if err != nil {
-		return err
+	entry := StorageEntry{
+		Path:        objectPath,
+		Md5sum:      nil,
+		ChunkLength: 0,
 	}
-	objectBytes, err := ioutil.ReadAll(object)
-	if err != nil {
+
+	hash := md5.New()
+	i := 0
+	for chunk := range chunks {
+		if chunk.Err != nil {
+			return chunk.Err
+		}
+		err := fsStorage.storeBlocks(objectPath, i, chunk.Data)
+		if err != nil {
+			return err
+		}
+		// md5sum only after chunk is committed to disk
+		hash.Write(chunk.Data)
+		i++
+	}
+	entry.Md5sum = hash.Sum(nil)
+	entry.ChunkLength = i
+	fsStorage.objects[objectPath] = entry
+	var gobBuffer bytes.Buffer
+	gobEncoder := gob.NewEncoder(&gobBuffer)
+	gobEncoder.Encode(fsStorage.objects)
+	ioutil.WriteFile(path.Join(fsStorage.RootDir, "index"), gobBuffer.Bytes(), 0600)
+	return nil
+}
+
+func (fsStorage *fileSystemStorage) storeBlocks(objectPath string, index int, chunk []byte) error {
+	appendStorage := fsStorage.diskStorage[0]
+	path := objectPath + "$" + strconv.Itoa(index)
+	if err := appendStorage.Put(path, bytes.NewBuffer(chunk)); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(path.Join(storage.RootDir, objectPath), objectBytes, 0600)
+	return nil
 }

pkgs/storage/fsstorage/fs_storage_test.go

@@ -26,15 +26,19 @@ func (s *fileSystemStorageSuite) TestfileStoragePutAtRootPath(c *C) {
 	defer os.RemoveAll(rootDir)
 
 	var objectStorage storage.ObjectStorage
-	objectStorage, _ = NewStorage(rootDir)
+	objectStorage, _ = NewStorage(rootDir, 1024)
 
 	objectBuffer := bytes.NewBuffer([]byte("object1"))
-	objectStorage.Put("path1", objectBuffer)
+	err = objectStorage.Put("path1", objectBuffer)
+	c.Assert(err, IsNil)
 
 	// assert object1 was created in correct path
 	objectResult1, err := objectStorage.Get("path1")
 	c.Assert(err, IsNil)
-	object1, _ := ioutil.ReadAll(objectResult1)
+
+	object1, err := ioutil.ReadAll(objectResult1)
+	c.Assert(err, IsNil)
+
 	c.Assert(string(object1), Equals, "object1")
 
 	objectList, err := objectStorage.List()