github.com/cs3org/reva/v2@v2.27.7/pkg/storage/fs/posix/blobstore/blobstore.go (about)

     1  // Copyright 2018-2021 CERN
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // In applying this license, CERN does not waive the privileges and immunities
    16  // granted to it by virtue of its status as an Intergovernmental Organization
    17  // or submit itself to any jurisdiction.
    18  
    19  package blobstore
    20  
    21  import (
    22  	"bufio"
    23  	"io"
    24  	"os"
    25  
    26  	"github.com/cs3org/reva/v2/pkg/storage/utils/decomposedfs/node"
    27  	"github.com/pkg/errors"
    28  )
    29  
    30  // Blobstore provides an interface to an filesystem based blobstore
    31  type Blobstore struct {
    32  	root string
    33  }
    34  
    35  // New returns a new Blobstore
    36  func New(root string) (*Blobstore, error) {
    37  	return &Blobstore{
    38  		root: root,
    39  	}, nil
    40  }
    41  
    42  // Upload stores some data in the blobstore under the given key
    43  func (bs *Blobstore) Upload(node *node.Node, source string) error {
    44  	path := node.InternalPath()
    45  
    46  	// preserve the mtime of the file
    47  	fi, _ := os.Stat(path)
    48  
    49  	file, err := os.Open(source)
    50  	if err != nil {
    51  		return errors.Wrap(err, "Decomposedfs: oCIS blobstore: Can not open source file to upload")
    52  	}
    53  	defer file.Close()
    54  
    55  	f, err := os.OpenFile(node.InternalPath(), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0700)
    56  	if err != nil {
    57  		return errors.Wrapf(err, "could not open blob '%s' for writing", node.InternalPath())
    58  	}
    59  	defer f.Close()
    60  
    61  	w := bufio.NewWriter(f)
    62  	_, err = w.ReadFrom(file)
    63  	if err != nil {
    64  		return errors.Wrapf(err, "could not write blob '%s'", node.InternalPath())
    65  	}
    66  
    67  	err = w.Flush()
    68  	if err != nil {
    69  		return err
    70  	}
    71  
    72  	if fi != nil {
    73  		return os.Chtimes(path, fi.ModTime(), fi.ModTime())
    74  	}
    75  	return nil
    76  }
    77  
    78  // Download retrieves a blob from the blobstore for reading
    79  func (bs *Blobstore) Download(node *node.Node) (io.ReadCloser, error) {
    80  	file, err := os.Open(node.InternalPath())
    81  	if err != nil {
    82  		return nil, errors.Wrapf(err, "could not read blob '%s'", node.InternalPath())
    83  	}
    84  	return file, nil
    85  }
    86  
    87  // Delete deletes a blob from the blobstore
    88  func (bs *Blobstore) Delete(node *node.Node) error {
    89  	return nil
    90  }