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package resource
import (
"io"
"os"
)
// Provides access to resources through the native OS filesystem.
type OSFileProvider struct{}
var _ Provider = OSFileProvider{}
func (me OSFileProvider) NewInstance(filePath string) (r Instance, err error) {
return &osFileInstance{filePath}, nil
}
type osFileInstance struct {
path string
}
var _ Instance = &osFileInstance{}
func (me *osFileInstance) Get() (ret io.ReadCloser, err error) {
return os.Open(me.path)
}
func (me *osFileInstance) Put(r io.Reader) (err error) {
f, err := os.OpenFile(me.path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0640)
if err != nil {
return
}
defer f.Close()
_, err = io.Copy(f, r)
return
}
func (me *osFileInstance) ReadAt(b []byte, off int64) (n int, err error) {
f, err := os.Open(me.path)
if err != nil {
return
}
defer f.Close()
return f.ReadAt(b, off)
}
func (me *osFileInstance) WriteAt(b []byte, off int64) (n int, err error) {
f, err := os.OpenFile(me.path, os.O_CREATE|os.O_WRONLY, 0640)
if err != nil {
return
}
defer f.Close()
return f.WriteAt(b, off)
}
func (me *osFileInstance) Stat() (fi os.FileInfo, err error) {
return os.Stat(me.path)
}
func (me *osFileInstance) Delete() error {
return os.Remove(me.path)
}
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