2017-05-01 15:08:46 -04:00
|
|
|
// Copyright 2017 The Hugo Authors. All rights reserved.
|
|
|
|
//
|
|
|
|
// 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 data
|
|
|
|
|
|
|
|
import (
|
|
|
|
"errors"
|
|
|
|
"net/url"
|
|
|
|
"sync"
|
|
|
|
|
|
|
|
"github.com/spf13/afero"
|
2017-06-13 12:42:45 -04:00
|
|
|
"github.com/gohugoio/hugo/config"
|
|
|
|
"github.com/gohugoio/hugo/helpers"
|
2017-05-01 15:08:46 -04:00
|
|
|
)
|
|
|
|
|
|
|
|
var cacheMu sync.RWMutex
|
|
|
|
|
|
|
|
// getCacheFileID returns the cache ID for a string.
|
|
|
|
func getCacheFileID(cfg config.Provider, id string) string {
|
|
|
|
return cfg.GetString("cacheDir") + url.QueryEscape(id)
|
|
|
|
}
|
|
|
|
|
|
|
|
// getCache returns the content for an ID from the file cache or an error.
|
|
|
|
// If the ID is not found, return nil,nil.
|
|
|
|
func getCache(id string, fs afero.Fs, cfg config.Provider, ignoreCache bool) ([]byte, error) {
|
|
|
|
if ignoreCache {
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
cacheMu.RLock()
|
|
|
|
defer cacheMu.RUnlock()
|
|
|
|
|
|
|
|
fID := getCacheFileID(cfg, id)
|
|
|
|
isExists, err := helpers.Exists(fID, fs)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
if !isExists {
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
return afero.ReadFile(fs, fID)
|
|
|
|
}
|
|
|
|
|
|
|
|
// writeCache writes bytes associated with an ID into the file cache.
|
|
|
|
func writeCache(id string, c []byte, fs afero.Fs, cfg config.Provider, ignoreCache bool) error {
|
|
|
|
if ignoreCache {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
cacheMu.Lock()
|
|
|
|
defer cacheMu.Unlock()
|
|
|
|
|
|
|
|
fID := getCacheFileID(cfg, id)
|
|
|
|
f, err := fs.Create(fID)
|
|
|
|
if err != nil {
|
|
|
|
return errors.New("Error: " + err.Error() + ". Failed to create file: " + fID)
|
|
|
|
}
|
|
|
|
defer f.Close()
|
|
|
|
|
|
|
|
n, err := f.Write(c)
|
|
|
|
if err != nil {
|
|
|
|
return errors.New("Error: " + err.Error() + ". Failed to write to file: " + fID)
|
|
|
|
}
|
|
|
|
if n == 0 {
|
|
|
|
return errors.New("No bytes written to file: " + fID)
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func deleteCache(id string, fs afero.Fs, cfg config.Provider) error {
|
|
|
|
return fs.Remove(getCacheFileID(cfg, id))
|
|
|
|
}
|