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6cd33f6953
Use a hash for the cache key, to fix 'file name too long' errors when retreiving from long urls Fixes #3690
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package data
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import (
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"crypto/md5"
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"encoding/hex"
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"errors"
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"sync"
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"github.com/gohugoio/hugo/config"
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"github.com/gohugoio/hugo/helpers"
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"github.com/spf13/afero"
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)
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var cacheMu sync.RWMutex
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// getCacheFileID returns the cache ID for a string.
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func getCacheFileID(cfg config.Provider, id string) string {
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hash := md5.Sum([]byte(id))
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return cfg.GetString("cacheDir") + hex.EncodeToString(hash[:])
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}
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// getCache returns the content for an ID from the file cache or an error.
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// If the ID is not found, return nil,nil.
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func getCache(id string, fs afero.Fs, cfg config.Provider, ignoreCache bool) ([]byte, error) {
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if ignoreCache {
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return nil, nil
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}
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cacheMu.RLock()
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defer cacheMu.RUnlock()
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fID := getCacheFileID(cfg, id)
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isExists, err := helpers.Exists(fID, fs)
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if err != nil {
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return nil, err
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}
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if !isExists {
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return nil, nil
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}
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return afero.ReadFile(fs, fID)
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}
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// writeCache writes bytes associated with an ID into the file cache.
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func writeCache(id string, c []byte, fs afero.Fs, cfg config.Provider, ignoreCache bool) error {
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if ignoreCache {
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return nil
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}
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cacheMu.Lock()
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defer cacheMu.Unlock()
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fID := getCacheFileID(cfg, id)
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f, err := fs.Create(fID)
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if err != nil {
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return errors.New("Error: " + err.Error() + ". Failed to create file: " + fID)
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}
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defer f.Close()
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n, err := f.Write(c)
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if err != nil {
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return errors.New("Error: " + err.Error() + ". Failed to write to file: " + fID)
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}
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if n == 0 {
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return errors.New("No bytes written to file: " + fID)
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}
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return nil
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}
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func deleteCache(id string, fs afero.Fs, cfg config.Provider) error {
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return fs.Remove(getCacheFileID(cfg, id))
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}
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