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// Copyright 2016 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 (
"bytes"
"encoding/csv"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"strings"
"sync"
"time"
"github.com/spf13/afero"
"github.com/spf13/hugo/config"
"github.com/spf13/hugo/helpers"
jww "github.com/spf13/jwalterweatherman"
)
var (
remoteURLLock = &remoteLock{m: make(map[string]*sync.Mutex)}
resSleep = time.Second * 2 // if JSON decoding failed sleep for n seconds before retrying
resRetries = 1 // number of retries to load the JSON from URL or local file system
resCacheMu sync.RWMutex
)
type remoteLock struct {
sync.RWMutex
m map[string]*sync.Mutex
}
// URLLock locks an URL during download
func (l *remoteLock) URLLock(url string) {
var (
lock *sync.Mutex
ok bool
)
l.Lock()
if lock, ok = l.m[url]; !ok {
lock = &sync.Mutex{}
l.m[url] = lock
}
l.Unlock()
lock.Lock()
}
// URLUnlock unlocks an URL when the download has been finished. Use only in defer calls.
func (l *remoteLock) URLUnlock(url string) {
l.RLock()
defer l.RUnlock()
if um, ok := l.m[url]; ok {
um.Unlock()
}
}
// getCacheFileID returns the cache ID for a string
func getCacheFileID(cfg config.Provider, id string) string {
return cfg.GetString("cacheDir") + url.QueryEscape(id)
}
// resGetCache returns the content for an ID from the file cache or an error
// if the file is not found returns nil,nil
func resGetCache(id string, fs afero.Fs, cfg config.Provider, ignoreCache bool) ([]byte, error) {
resCacheMu.RLock()
defer resCacheMu.RUnlock()
if ignoreCache {
return nil, nil
}
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)
}
// resWriteCache writes bytes to an ID into the file cache
func resWriteCache(id string, c []byte, fs afero.Fs, cfg config.Provider, ignoreCache bool) error {
resCacheMu.Lock()
defer resCacheMu.Unlock()
if ignoreCache {
return nil
}
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 n == 0 {
return errors.New("No bytes written to file: " + fID)
}
if err != nil {
return errors.New("Error: " + err.Error() + ". Failed to write to file: " + fID)
}
return nil
}
func resDeleteCache(id string, fs afero.Fs, cfg config.Provider) error {
return fs.Remove(getCacheFileID(cfg, id))
}
// resGetRemote loads the content of a remote file. This method is thread safe.
func resGetRemote(url string, fs afero.Fs, cfg config.Provider, hc *http.Client) ([]byte, error) {
c, err := resGetCache(url, fs, cfg, cfg.GetBool("ignoreCache"))
if c != nil && err == nil {
return c, nil
}
if err != nil {
return nil, err
}
// avoid race condition with locks, block other goroutines if the current url is processing
remoteURLLock.URLLock(url)
defer func() { remoteURLLock.URLUnlock(url) }()
// avoid multiple locks due to calling resGetCache twice
c, err = resGetCache(url, fs, cfg, cfg.GetBool("ignoreCache"))
if c != nil && err == nil {
return c, nil
}
if err != nil {
return nil, err
}
jww.INFO.Printf("Downloading: %s ...", url)
res, err := hc.Get(url)
if err != nil {
return nil, err
}
c, err = ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
return nil, err
}
err = resWriteCache(url, c, fs, cfg, cfg.GetBool("ignoreCache"))
if err != nil {
return nil, err
}
jww.INFO.Printf("... and cached to: %s", getCacheFileID(cfg, url))
return c, nil
}
// resGetLocal loads the content of a local file
func resGetLocal(url string, fs afero.Fs, cfg config.Provider) ([]byte, error) {
filename := filepath.Join(cfg.GetString("workingDir"), url)
if e, err := helpers.Exists(filename, fs); !e {
return nil, err
}
return afero.ReadFile(fs, filename)
}
// resGetResource loads the content of a local or remote file
func (ns *Namespace) resGetResource(url string) ([]byte, error) {
if url == "" {
return nil, nil
}
if strings.Contains(url, "://") {
return resGetRemote(url, ns.deps.Fs.Source, ns.deps.Cfg, http.DefaultClient)
}
return resGetLocal(url, ns.deps.Fs.Source, ns.deps.Cfg)
}
// GetJSON expects one or n-parts of a URL to a resource which can either be a local or a remote one.
// If you provide multiple parts they will be joined together to the final URL.
// GetJSON returns nil or parsed JSON to use in a short code.
func (ns *Namespace) GetJSON(urlParts ...string) interface{} {
var v interface{}
url := strings.Join(urlParts, "")
for i := 0; i <= resRetries; i++ {
c, err := ns.resGetResource(url)
if err != nil {
jww.ERROR.Printf("Failed to get json resource %s with error message %s", url, err)
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