preparing to support S3 multipart uploads

weed/s3api/filer_util.go

@@ -10,22 +10,28 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
 
-func (s3a *S3ApiServer) mkdir(parentDirectoryPath string, dirName string) error {
+func (s3a *S3ApiServer) mkdir(parentDirectoryPath string, dirName string, fn func(entry *filer_pb.Entry)) error {
 	return s3a.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
+		entry := &filer_pb.Entry{
+			Name:        dirName,
+			IsDirectory: true,
+			Attributes: &filer_pb.FuseAttributes{
+				Mtime:    time.Now().Unix(),
+				Crtime:   time.Now().Unix(),
+				FileMode: uint32(0777 | os.ModeDir),
+				Uid:      OS_UID,
+				Gid:      OS_GID,
+			},
+		}
+
+		if fn != nil {
+			fn(entry)
+		}
+
 		request := &filer_pb.CreateEntryRequest{
 			Directory: parentDirectoryPath,
-			Entry: &filer_pb.Entry{
-				Name:        dirName,
-				IsDirectory: true,
-				Attributes: &filer_pb.FuseAttributes{
-					Mtime:    time.Now().Unix(),
-					Crtime:   time.Now().Unix(),
-					FileMode: uint32(0777 | os.ModeDir),
-					Uid:      OS_UID,
-					Gid:      OS_GID,
-				},
-			},
+			Entry:     entry,
 		}
 
 		glog.V(1).Infof("create bucket: %v", request)
@@ -83,3 +89,28 @@ func (s3a *S3ApiServer) rm(parentDirectoryPath string, entryName string, isDirec
 	})
 
 }
+
+func (s3a *S3ApiServer) exists(parentDirectoryPath string, entryName string, isDirectory bool) (exists bool, err error) {
+
+	err = s3a.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx := context.Background()
+
+		request := &filer_pb.LookupDirectoryEntryRequest{
+			Directory: parentDirectoryPath,
+			Name:      entryName,
+		}
+
+		glog.V(1).Infof("delete entry %v/%v: %v", parentDirectoryPath, entryName, request)
+		resp, err := client.LookupDirectoryEntry(ctx, request)
+		if err != nil {
+			return fmt.Errorf("delete entry %s/%s: %v", parentDirectoryPath, entryName, err)
+		}
+
+		exists = resp.Entry.IsDirectory == isDirectory
+
+		return nil
+	})
+
+	return
+}