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blobstore.go
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blobstore.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package blobstore
import (
"bufio"
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
)
// Blobstore provides an interface to an filesystem based blobstore
type Blobstore struct {
root string
}
// New returns a new Blobstore
func New(root string) (*Blobstore, error) {
err := os.MkdirAll(root, 0700)
if err != nil {
return nil, err
}
return &Blobstore{
root: root,
}, nil
}
// Upload stores some data in the blobstore under the given key
func (bs *Blobstore) Upload(key string, data io.Reader) error {
f, err := os.OpenFile(bs.path(key), os.O_CREATE|os.O_WRONLY, 0700)
if err != nil {
return errors.Wrapf(err, "could not open blob '%s' for writing", key)
}
w := bufio.NewWriter(f)
_, err = w.ReadFrom(data)
if err != nil {
return errors.Wrapf(err, "could not write blob '%s'", key)
}
return w.Flush()
}
// Download retrieves a blob from the blobstore for reading
func (bs *Blobstore) Download(key string) (io.ReadCloser, error) {
file, err := os.Open(bs.path(key))
if err != nil {
return nil, errors.Wrapf(err, "could not read blob '%s'", key)
}
return file, nil
}
// Delete deletes a blob from the blobstore
func (bs *Blobstore) Delete(key string) error {
err := os.Remove(bs.path(key))
if err != nil {
return errors.Wrapf(err, "could not delete blob '%s'", key)
}
return nil
}
func (bs *Blobstore) path(key string) string {
return filepath.Join(bs.root, filepath.Clean(filepath.Join("/", key)))
}