moth/src/mothball.go

80 lines
1.2 KiB
Go
Raw Normal View History

2018-09-14 18:24:48 -06:00
package main
2018-05-09 21:52:52 -06:00
import (
"archive/zip"
"fmt"
"io"
2018-09-14 18:24:48 -06:00
"io/ioutil"
2018-05-09 21:52:52 -06:00
"os"
"time"
)
type Mothball struct {
zf *zip.ReadCloser
filename string
mtime time.Time
}
2018-09-14 18:24:48 -06:00
func OpenMothball(filename string) (*Mothball, error) {
2018-05-09 21:52:52 -06:00
var m Mothball
m.filename = filename
err := m.Refresh()
if err != nil {
return nil, err
}
return &m, nil
}
func (m *Mothball) Close() (error) {
return m.zf.Close()
}
func (m *Mothball) Refresh() (error) {
info, err := os.Stat(m.filename)
if err != nil {
return err
}
mtime := info.ModTime()
2018-09-14 18:24:48 -06:00
if ! mtime.After(m.mtime) {
2018-05-09 21:52:52 -06:00
return nil
}
zf, err := zip.OpenReader(m.filename)
if err != nil {
return err
}
if m.zf != nil {
m.zf.Close()
}
m.zf = zf
m.mtime = mtime
return nil
}
func (m *Mothball) Open(filename string) (io.ReadCloser, error) {
for _, f := range m.zf.File {
if filename == f.Name {
ret, err := f.Open()
return ret, err
}
}
return nil, fmt.Errorf("File not found: %s in %s", filename, m.filename)
}
2018-09-14 18:24:48 -06:00
func (m *Mothball) ReadFile(filename string) ([]byte, error) {
f, err := m.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
bytes, err := ioutil.ReadAll(f)
return bytes, err
}