Adding fs storage

pkg/storage/fs/fs.go

@@ -0,0 +1,201 @@
+package fs
+
+import (
+	"errors"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"strings"
+	"sync"
+
+	mstorage "github.com/minio-io/minio/pkg/storage"
+)
+
+type storage struct {
+	root      string
+	writeLock sync.Mutex
+}
+
+type MkdirFailedError struct{}
+
+func (self MkdirFailedError) Error() string {
+	return "Mkdir Failed"
+}
+
+func Start(root string) (chan<- string, <-chan error, *storage) {
+	ctrlChannel := make(chan string)
+	errorChannel := make(chan error)
+	go start(ctrlChannel, errorChannel)
+	return ctrlChannel, errorChannel, &storage{root: root}
+}
+
+func start(ctrlChannel <-chan string, errorChannel chan<- error) {
+	close(errorChannel)
+}
+
+// Bucket Operaotions
+
+func (storage *storage) ListBuckets(prefix string) ([]mstorage.BucketMetadata, error) {
+	return []mstorage.BucketMetadata{}, errors.New("Not Implemented")
+}
+
+func (storage *storage) StoreBucket(bucket string) error {
+	storage.writeLock.Lock()
+	defer storage.writeLock.Unlock()
+
+	// verify bucket path legal
+	if mstorage.IsValidBucket(bucket) == false {
+		return mstorage.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// get bucket path
+	bucketDir := path.Join(storage.root, bucket)
+
+	// check if bucket exists
+	if _, err := os.Stat(bucketDir); err == nil {
+		return mstorage.BucketExists{
+			Bucket: bucket,
+		}
+	}
+
+	// make bucket
+	err := os.Mkdir(bucketDir, 0700)
+	if err != nil {
+		return mstorage.EmbedError(bucket, "", err)
+	}
+	return nil
+}
+
+// Object Operations
+
+func (storage *storage) CopyObjectToWriter(w io.Writer, bucket string, object string) (int64, error) {
+	// validate bucket
+	if mstorage.IsValidBucket(bucket) == false {
+		return 0, mstorage.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// validate object
+	if mstorage.IsValidObject(object) == false {
+		return 0, mstorage.ObjectNameInvalid{Bucket: bucket, Object: object}
+	}
+
+	objectPath := path.Join(storage.root, bucket, object)
+
+	file, err := os.Open(objectPath)
+	if err != nil {
+		return 0, mstorage.EmbedError(bucket, object, err)
+	}
+	count, err := io.Copy(w, file)
+	if err != nil {
+		return count, mstorage.EmbedError(bucket, object, err)
+	}
+	return count, nil
+}
+
+func (storage *storage) GetObjectMetadata(bucket string, object string) (mstorage.ObjectMetadata, error) {
+	if mstorage.IsValidBucket(bucket) == false {
+		return mstorage.ObjectMetadata{}, mstorage.BucketNameInvalid{Bucket: bucket}
+	}
+
+	if mstorage.IsValidObject(bucket) == false {
+		return mstorage.ObjectMetadata{}, mstorage.ObjectNameInvalid{Bucket: bucket, Object: bucket}
+	}
+
+	objectPath := path.Join(storage.root, bucket, object)
+
+	stat, err := os.Stat(objectPath)
+	if os.IsNotExist(err) {
+		return mstorage.ObjectMetadata{}, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+	}
+
+	metadata := mstorage.ObjectMetadata{
+		Bucket:  bucket,
+		Key:     object,
+		Created: stat.ModTime(),
+		Size:    stat.Size(),
+		ETag:    bucket + "#" + object,
+	}
+
+	return metadata, nil
+}
+
+func (storage *storage) ListObjects(bucket, prefix string, count int) ([]mstorage.ObjectMetadata, bool, error) {
+	if mstorage.IsValidBucket(bucket) == false {
+		return []mstorage.ObjectMetadata{}, false, mstorage.BucketNameInvalid{Bucket: bucket}
+	}
+	if mstorage.IsValidObject(prefix) == false {
+		return []mstorage.ObjectMetadata{}, false, mstorage.ObjectNameInvalid{Bucket: bucket, Object: prefix}
+	}
+
+	rootPrefix := path.Join(storage.root, bucket)
+
+	files, err := ioutil.ReadDir(rootPrefix)
+	if err != nil {
+		return []mstorage.ObjectMetadata{}, false, mstorage.EmbedError("bucket", "", err)
+	}
+
+	var metadataList []mstorage.ObjectMetadata
+	for _, file := range files {
+		if len(metadataList) >= count {
+			return metadataList, true, nil
+		}
+		if strings.HasPrefix(file.Name(), prefix) {
+			metadata := mstorage.ObjectMetadata{
+				Bucket:  bucket,
+				Key:     file.Name(),
+				Created: file.ModTime(),
+				Size:    file.Size(),
+				ETag:    bucket + "#" + file.Name(),
+			}
+			metadataList = append(metadataList, metadata)
+		}
+	}
+	return metadataList, false, nil
+}
+
+func (storage *storage) StoreObject(bucket string, key string, data io.Reader) error {
+	// TODO Commits should stage then move instead of writing directly
+	storage.writeLock.Lock()
+	defer storage.writeLock.Unlock()
+
+	// check bucket name valid
+	if mstorage.IsValidBucket(bucket) == false {
+		return mstorage.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// check bucket exists
+	if _, err := os.Stat(path.Join(storage.root, bucket)); os.IsNotExist(err) {
+		return mstorage.BucketNotFound{Bucket: bucket}
+	}
+
+	// verify object path legal
+	if mstorage.IsValidObject(key) == false {
+		return mstorage.ObjectNameInvalid{Bucket: bucket, Object: key}
+	}
+
+	// get object path
+	objectPath := path.Join(storage.root, bucket, key)
+
+	// check if object exists
+	if _, err := os.Stat(objectPath); !os.IsNotExist(err) {
+		return mstorage.ObjectExists{
+			Bucket: bucket,
+			Key:    key,
+		}
+	}
+
+	// write object
+	file, err := os.OpenFile(objectPath, os.O_WRONLY|os.O_CREATE, 0600)
+	defer file.Close()
+	if err != nil {
+		return mstorage.EmbedError(bucket, key, err)
+	}
+
+	_, err = io.Copy(file, data)
+	if err != nil {
+		return mstorage.EmbedError(bucket, key, err)
+	}
+
+	return nil
+}

pkg/storage/fs/fs_test.go

@@ -0,0 +1,42 @@
+package fs
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"testing"
+
+	mstorage "github.com/minio-io/minio/pkg/storage"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func (s *MySuite) TestAPISuite(c *C) {
+	var storageList []string
+	create := func() mstorage.Storage {
+		path, err := ioutil.TempDir(os.TempDir(), "minio-fs-")
+		log.Println(path)
+		c.Check(err, IsNil)
+		storageList = append(storageList, path)
+		_, _, store := Start(path)
+		return store
+	}
+	log.Println("FOO")
+	mstorage.APITestSuite(c, create)
+	log.Println("BAR")
+	removeRoots(c, storageList)
+}
+
+func removeRoots(c *C, roots []string) {
+	log.Println("REMOVING ROOTS: ", roots)
+	for _, root := range roots {
+		err := os.RemoveAll(root)
+		c.Check(err, IsNil)
+	}
+}

pkg/storage/storage_api_suite.go

@@ -11,10 +11,10 @@ import (
 func APITestSuite(c *C, create func() Storage) {
 	testCreateBucket(c, create)
 	testMultipleObjectCreation(c, create)
-	//testPaging(c, create)
+	testPaging(c, create)
-	//testObjectOverwriteFails(c, create)
+	testObjectOverwriteFails(c, create)
-	//testNonExistantBucketOperations(c, create)
+	testNonExistantBucketOperations(c, create)
-	//testBucketRecreateFails(c, create)
+	testBucketRecreateFails(c, create)
 }
 
 func testCreateBucket(c *C, create func() Storage) {
@@ -58,24 +58,24 @@ func testMultipleObjectCreation(c *C, create func() Storage) {
 func testPaging(c *C, create func() Storage) {
 	storage := create()
 	storage.StoreBucket("bucket")
-	storage.ListObjects("bucket", "", 1000)
+	storage.ListObjects("bucket", "", 5)
-	objects, isTruncated, err := storage.ListObjects("bucket", "", 1000)
+	objects, isTruncated, err := storage.ListObjects("bucket", "", 5)
 	c.Check(len(objects), Equals, 0)
 	c.Check(isTruncated, Equals, false)
 	c.Check(err, IsNil)
-	for i := 1; i <= 1000; i++ {
+	for i := 1; i <= 5; i++ {
 		key := "obj" + strconv.Itoa(i)
 		storage.StoreObject("bucket", key, bytes.NewBufferString(key))
-		objects, isTruncated, err = storage.ListObjects("bucket", "", 1000)
+		objects, isTruncated, err = storage.ListObjects("bucket", "", 5)
 		c.Check(len(objects), Equals, i)
 		c.Check(isTruncated, Equals, false)
 		c.Check(err, IsNil)
 	}
-	for i := 1001; i <= 2000; i++ {
+	for i := 6; i <= 10; i++ {
 		key := "obj" + strconv.Itoa(i)
 		storage.StoreObject("bucket", key, bytes.NewBufferString(key))
-		objects, isTruncated, err = storage.ListObjects("bucket", "", 1000)
+		objects, isTruncated, err = storage.ListObjects("bucket", "", 5)
-		c.Check(len(objects), Equals, 1000)
+		c.Check(len(objects), Equals, 5)
 		c.Check(isTruncated, Equals, true)
 		c.Check(err, IsNil)
 	}
@@ -86,8 +86,13 @@ func testObjectOverwriteFails(c *C, create func() Storage) {
 	storage.StoreBucket("bucket")
 	err := storage.StoreObject("bucket", "object", bytes.NewBufferString("one"))
 	c.Check(err, IsNil)
-	err = storage.StoreObject("bucket", "object", bytes.NewBufferString("one"))
+	err = storage.StoreObject("bucket", "object", bytes.NewBufferString("three"))
 	c.Check(err, Not(IsNil))
+	var bytesBuffer bytes.Buffer
+	length, err := storage.CopyObjectToWriter(&bytesBuffer, "bucket", "object")
+	c.Check(length, Equals, int64(len("one")))
+	c.Check(err, IsNil)
+	c.Check(string(bytesBuffer.Bytes()), Equals, "one")
 }
 
 func testNonExistantBucketOperations(c *C, create func() Storage) {