89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
/*
|
|
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
|
|
* Author: Alex Yatskov <alex@foosoft.net>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
* this software and associated documentation files (the "Software"), to deal in
|
|
* the Software without restriction, including without limitation the rights to
|
|
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
* the Software, and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/md5"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"os"
|
|
"path"
|
|
"time"
|
|
|
|
"github.com/PuerkitoBio/goquery"
|
|
)
|
|
|
|
type webCache struct {
|
|
directory string
|
|
ticker *time.Ticker
|
|
}
|
|
|
|
func newWebCache(directory string) (*webCache, error) {
|
|
if err := os.MkdirAll(directory, 0755); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cache := &webCache{
|
|
directory: directory,
|
|
ticker: time.NewTicker(time.Millisecond * 100),
|
|
}
|
|
|
|
return cache, nil
|
|
}
|
|
|
|
func (c *webCache) urlToLocal(url string) string {
|
|
hash := md5.New()
|
|
hash.Write([]byte(url))
|
|
return path.Join(c.directory, fmt.Sprintf("%x.html", hash.Sum(nil)))
|
|
}
|
|
|
|
func (c *webCache) load(url string) (*goquery.Document, error) {
|
|
localPath := c.urlToLocal(url)
|
|
|
|
if file, err := os.Open(localPath); err == nil {
|
|
defer file.Close()
|
|
return goquery.NewDocumentFromReader(file)
|
|
}
|
|
|
|
<-c.ticker.C
|
|
|
|
res, err := http.Get(url)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer res.Body.Close()
|
|
|
|
var buff bytes.Buffer
|
|
if _, err := buff.ReadFrom(res.Body); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if err := ioutil.WriteFile(localPath, buff.Bytes(), 0644); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return goquery.NewDocumentFromReader(&buff)
|
|
}
|