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jscache.go
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jscache.go
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/*
* Copyright (c) 2015, Shinya Yagyu
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package cgi
import (
"io/ioutil"
"log"
"os"
"path"
"sort"
"strings"
"time"
"github.com/shingetsu-gou/shingetsu-gou/util"
)
//finfo contains file info,including mtime and content.
type finfo struct {
mtime *time.Time
cont []byte
exist bool
}
//jsCache contains js inf, i.e. path info and finfo of each js files..
type jsCache struct {
path string
files map[string]*finfo
}
//newJsCache return jsCache instnace and parse all js files under path dir.
func newJsCache(path string) *jsCache {
j := &jsCache{path: path, files: make(map[string]*finfo)}
j.update()
return j
}
//GetLatest gets latest mtime of all jsCache.files.
func (j *jsCache) GetLatest() int64 {
var l *time.Time
for _, v := range j.files {
if l == nil || v.mtime.After(*l) {
l = v.mtime
}
}
return l.Unix()
}
//getContent concat contents of all js files sorted by keys(filenames).
func (j *jsCache) getContent() string {
j.update()
var cont string
keys := make([]string, len(j.files))
i := 0
for k := range j.files {
keys[i] = k
i++
}
sort.Strings(keys)
for _, k := range keys {
cont += string(j.files[k].cont)
}
return cont
}
//update reloads all js files if mtime is newer.
func (j *jsCache) update() {
for k := range j.files {
j.files[k].exist = false
}
err := util.EachFiles(j.path, func(f os.FileInfo) error {
var err error
name := f.Name()
if !strings.HasSuffix(name, ".js") || strings.HasPrefix(name, ".") || strings.HasPrefix(name, "_") {
return nil
}
oldfi, exist := j.files[name]
if !exist || f.ModTime().After(*oldfi.mtime) {
m := f.ModTime()
fi := finfo{mtime: &m, exist: true}
fi.cont, err = ioutil.ReadFile(path.Join(j.path, name))
j.files[name] = &fi
} else {
oldfi.exist = true
}
return err
})
if err != nil {
log.Fatal(err)
}
for k := range j.files {
if !j.files[k].exist {
delete(j.files, k)
}
}
}