82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
|
|
// 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 bleve
|
|
|
|
import (
|
|
"encoding/json"
|
|
"io/ioutil"
|
|
"os"
|
|
)
|
|
|
|
const metaFilename = "index_meta.json"
|
|
|
|
type indexMeta struct {
|
|
Storage string `json:"storage"`
|
|
Config map[string]interface{} `json:"config,omitempty"`
|
|
}
|
|
|
|
func newIndexMeta(storage string, config map[string]interface{}) *indexMeta {
|
|
return &indexMeta{
|
|
Storage: storage,
|
|
Config: config,
|
|
}
|
|
}
|
|
|
|
func openIndexMeta(path string) (*indexMeta, error) {
|
|
if _, err := os.Stat(path); os.IsNotExist(err) {
|
|
return nil, ErrorIndexPathDoesNotExist
|
|
}
|
|
indexMetaPath := indexMetaPath(path)
|
|
metaBytes, err := ioutil.ReadFile(indexMetaPath)
|
|
if err != nil {
|
|
return nil, ErrorIndexMetaMissing
|
|
}
|
|
var im indexMeta
|
|
err = json.Unmarshal(metaBytes, &im)
|
|
if err != nil {
|
|
return nil, ErrorIndexMetaCorrupt
|
|
}
|
|
return &im, nil
|
|
}
|
|
|
|
func (i *indexMeta) Save(path string) (err error) {
|
|
indexMetaPath := indexMetaPath(path)
|
|
// ensure any necessary parent directories exist
|
|
err = os.Mkdir(path, 0700)
|
|
if err != nil {
|
|
return ErrorIndexPathExists
|
|
}
|
|
metaBytes, err := json.Marshal(i)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
indexMetaFile, err := os.OpenFile(indexMetaPath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
|
|
if err != nil {
|
|
if os.IsExist(err) {
|
|
return ErrorIndexPathExists
|
|
}
|
|
return err
|
|
}
|
|
defer func() {
|
|
if ierr := indexMetaFile.Close(); err == nil && ierr != nil {
|
|
err = ierr
|
|
}
|
|
}()
|
|
_, err = indexMetaFile.Write(metaBytes)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func indexMetaPath(path string) string {
|
|
return path + string(os.PathSeparator) + metaFilename
|
|
}
|