92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package bleve
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"github.com/blevesearch/bleve/index/upside_down"
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)
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const metaFilename = "index_meta.json"
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type indexMeta struct {
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Storage string `json:"storage"`
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IndexType string `json:"index_type"`
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Config map[string]interface{} `json:"config,omitempty"`
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}
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func newIndexMeta(indexType string, storage string, config map[string]interface{}) *indexMeta {
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return &indexMeta{
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IndexType: indexType,
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Storage: storage,
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Config: config,
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}
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}
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func openIndexMeta(path string) (*indexMeta, error) {
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if _, err := os.Stat(path); os.IsNotExist(err) {
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return nil, ErrorIndexPathDoesNotExist
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}
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indexMetaPath := indexMetaPath(path)
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metaBytes, err := ioutil.ReadFile(indexMetaPath)
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if err != nil {
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return nil, ErrorIndexMetaMissing
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}
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var im indexMeta
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err = json.Unmarshal(metaBytes, &im)
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if err != nil {
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return nil, ErrorIndexMetaCorrupt
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}
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if im.IndexType == "" {
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im.IndexType = upside_down.Name
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}
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return &im, nil
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}
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func (i *indexMeta) Save(path string) (err error) {
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indexMetaPath := indexMetaPath(path)
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// ensure any necessary parent directories exist
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err = os.MkdirAll(path, 0700)
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if err != nil {
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if os.IsExist(err) {
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return ErrorIndexPathExists
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}
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return err
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}
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metaBytes, err := json.Marshal(i)
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if err != nil {
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return err
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}
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indexMetaFile, err := os.OpenFile(indexMetaPath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
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if err != nil {
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if os.IsExist(err) {
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return ErrorIndexPathExists
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}
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return err
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}
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defer func() {
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if ierr := indexMetaFile.Close(); err == nil && ierr != nil {
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err = ierr
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}
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}()
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_, err = indexMetaFile.Write(metaBytes)
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if err != nil {
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return err
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}
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return nil
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}
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func indexMetaPath(path string) string {
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return path + string(os.PathSeparator) + metaFilename
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}
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