agola/internal/objectstorage/objectstorage.go

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// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.
package objectstorage
import (
"io"
"time"
errors "golang.org/x/xerrors"
)
type Storage interface {
Stat(filepath string) (*ObjectInfo, error)
ReadObject(filepath string) (ReadSeekCloser, error)
// WriteObject atomically writes an object. If size is greater or equal to
// zero then only size bytes will be read from data and wrote. If size is
// less than zero data will be wrote until EOF. When persist is true the
// implementation must ensure that data is persisted to the underlying
// storage.
WriteObject(filepath string, data io.Reader, size int64, persist bool) error
DeleteObject(filepath string) error
List(prefix, startWith, delimiter string, doneCh <-chan struct{}) <-chan ObjectInfo
}
type ErrNotExist struct {
err error
}
func NewErrNotExist(err error) error {
return &ErrNotExist{err: err}
}
func (e *ErrNotExist) Error() string {
return e.err.Error()
}
func (*ErrNotExist) Is(err error) bool {
_, ok := err.(*ErrNotExist)
return ok
}
func IsNotExist(err error) bool {
return errors.Is(err, &ErrNotExist{})
}
type ReadSeekCloser interface {
io.Reader
io.Seeker
io.Closer
}
type ObjectInfo struct {
Path string
LastModified time.Time
Size int64
Err error
}
// ObjStorage wraps a Storage providing additional helper functions
type ObjStorage struct {
Storage
delimiter string
}
func NewObjStorage(s Storage, delimiter string) *ObjStorage {
return &ObjStorage{Storage: s, delimiter: delimiter}
}
func (s *ObjStorage) Delimiter() string {
return s.delimiter
}
func (s *ObjStorage) List(prefix, startWith string, recursive bool, doneCh <-chan struct{}) <-chan ObjectInfo {
delimiter := s.delimiter
if recursive {
delimiter = ""
}
return s.Storage.List(prefix, startWith, delimiter, doneCh)
}