Initial QSfera import

Server/pkg/storage/metadata/lazy.go

@@ -0,0 +1,166 @@
+package metadata
+
+import (
+	"context"
+	"errors"
+	"sync"
+
+	provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+	"github.com/go-playground/validator/v10"
+	"github.com/opencloud-eu/reva/v2/pkg/storage/utils/metadata"
+
+	"github.com/qsfera/server/pkg/storage"
+)
+
+// Lazy is a lazy storage implementation that initializes the underlying storage only when needed.
+type Lazy struct {
+	next func() (metadata.Storage, error)
+
+	initName string          `validate:"required"`
+	initCTX  context.Context `validate:"required"`
+}
+
+func NewLazyStorage(next metadata.Storage) (*Lazy, error) {
+	s := &Lazy{}
+	s.next = sync.OnceValues[metadata.Storage, error](func() (metadata.Storage, error) {
+		if err := validator.New(validator.WithPrivateFieldValidation()).Struct(s); err != nil {
+			return nil, errors.Join(storage.ErrStorageInitialization, storage.ErrStorageValidation, err)
+		}
+
+		if err := next.Init(s.initCTX, s.initName); err != nil {
+			return nil, errors.Join(storage.ErrStorageInitialization, err)
+		}
+
+		return next, nil
+	})
+
+	return s, nil
+}
+
+// Backend wraps the backend of the next storage
+func (s *Lazy) Backend() string {
+	next, err := s.next()
+	if err != nil {
+		return ""
+	}
+
+	return next.Backend()
+}
+
+// Init prepares the required data for the underlying lazy storage initialization
+func (s *Lazy) Init(ctx context.Context, name string) (err error) {
+	s.initCTX = ctx
+	s.initName = name
+
+	return nil
+}
+
+// Upload wraps the upload method of the next storage
+func (s *Lazy) Upload(ctx context.Context, req metadata.UploadRequest) (*metadata.UploadResponse, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.Upload(ctx, req)
+}
+
+// Download wraps the download method of the next storage
+func (s *Lazy) Download(ctx context.Context, req metadata.DownloadRequest) (*metadata.DownloadResponse, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.Download(ctx, req)
+}
+
+// SimpleUpload wraps the simple upload method of the next storage
+func (s *Lazy) SimpleUpload(ctx context.Context, uploadpath string, content []byte) error {
+	next, err := s.next()
+	if err != nil {
+		return err
+	}
+
+	return next.SimpleUpload(ctx, uploadpath, content)
+}
+
+// SimpleDownload wraps the simple download method of the next storage
+func (s *Lazy) SimpleDownload(ctx context.Context, path string) ([]byte, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.SimpleDownload(ctx, path)
+}
+
+// Delete wraps the delete method of the next storage
+func (s *Lazy) Delete(ctx context.Context, path string) error {
+	next, err := s.next()
+	if err != nil {
+		return err
+	}
+
+	return next.Delete(ctx, path)
+}
+
+// Stat wraps the stat method of the next storage
+func (s *Lazy) Stat(ctx context.Context, path string) (*provider.ResourceInfo, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.Stat(ctx, path)
+}
+
+// ReadDir wraps the read directory method of the next storage
+func (s *Lazy) ReadDir(ctx context.Context, path string) ([]string, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.ReadDir(ctx, path)
+}
+
+// ListDir wraps the list directory method of the next storage
+func (s *Lazy) ListDir(ctx context.Context, path string) ([]*provider.ResourceInfo, error) {
+	next, err := s.next()
+	if err != nil {
+		return nil, err
+	}
+
+	return next.ListDir(ctx, path)
+}
+
+// CreateSymlink wraps the create symlink method of the next storage
+func (s *Lazy) CreateSymlink(ctx context.Context, oldname, newname string) error {
+	next, err := s.next()
+	if err != nil {
+		return err
+	}
+
+	return next.CreateSymlink(ctx, oldname, newname)
+}
+
+// ResolveSymlink wraps the resolve symlink method of the next storage
+func (s *Lazy) ResolveSymlink(ctx context.Context, name string) (string, error) {
+	next, err := s.next()
+	if err != nil {
+		return "", err
+	}
+
+	return next.ResolveSymlink(ctx, name)
+}
+
+// MakeDirIfNotExist wraps the make directory if not exist method of the next storage
+func (s *Lazy) MakeDirIfNotExist(ctx context.Context, name string) error {
+	next, err := s.next()
+	if err != nil {
+		return err
+	}
+
+	return next.MakeDirIfNotExist(ctx, name)
+}

Server/pkg/storage/storage.go

@@ -0,0 +1,13 @@
+package storage
+
+import (
+	"errors"
+)
+
+var (
+	// ErrStorageInitialization is returned when the storage initialization fails
+	ErrStorageInitialization = errors.New("failed to initialize storage")
+
+	// ErrStorageValidation is returned when the storage configuration is invalid
+	ErrStorageValidation = errors.New("failed to validate storage configuration")
+)