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filestore.go
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filestore.go
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/*
* Copyright 2017-2023 Dgraph Labs, Inc. and Contributors
*
* 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 filestore
import (
"bufio"
"io"
"net/url"
"github.com/dgraph-io/dgraph/x"
)
// FileStore represents a file or directory of files that are either stored
// locally or on minio/s3
type FileStore interface {
// Similar to os.Open
Open(path string) (io.ReadCloser, error)
Exists(path string) bool
FindDataFiles(str string, ext []string) []string
ChunkReader(file string, key x.Sensitive) (*bufio.Reader, func())
}
// NewFileStore returns a new file storage. If remote, it's backed by an x.MinioClient
func NewFileStore(path string) FileStore {
url, err := url.Parse(path)
x.Check(err)
if url.Scheme == "minio" || url.Scheme == "s3" {
mc, err := x.NewMinioClient(url, nil)
x.Check(err)
return &remoteFiles{mc}
}
return &localFiles{}
}
// Open takes a single path and returns a io.ReadCloser, similar to os.Open
func Open(path string) (io.ReadCloser, error) {
return NewFileStore(path).Open(path)
}
// Exists returns false if the file doesn't exist. For remote storage, true does
// not guarantee existence
func Exists(path string) bool {
return NewFileStore(path).Exists(path)
}