vfs/database.go

116 lines
2.5 KiB
Go
Raw Normal View History

2015-05-08 09:28:53 +00:00
/*
* 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
2015-05-09 04:59:38 +00:00
import (
2015-05-10 10:41:15 +00:00
"bazil.org/fuse/fs"
2015-05-09 04:59:38 +00:00
"io/ioutil"
2015-05-09 13:48:08 +00:00
"path/filepath"
2015-05-09 04:59:38 +00:00
)
2015-05-10 07:15:17 +00:00
type database struct {
base string
vers []*version
2015-05-09 13:48:08 +00:00
}
2015-05-10 07:15:17 +00:00
func newDatabase(dir string) (*database, error) {
db := &database{base: dir}
2015-05-09 13:48:08 +00:00
if err := db.load(dir); err != nil {
return nil, err
}
return db, nil
2015-05-08 09:28:53 +00:00
}
2015-05-10 10:41:15 +00:00
func (this *database) Root() (fs.Node, error) {
return this.lastVersion(), nil
}
2015-05-10 07:15:17 +00:00
func (this *database) load(dir string) error {
2015-05-09 13:48:08 +00:00
base, err := filepath.Abs(dir)
if err != nil {
return err
}
2015-05-10 05:14:15 +00:00
dirs, err := this.scan(base)
if err != nil {
return err
}
2015-05-09 13:48:08 +00:00
2015-05-10 10:41:15 +00:00
vers, err := this.versions(dirs)
2015-05-09 04:59:38 +00:00
if err != nil {
return err
}
2015-05-10 05:14:15 +00:00
this.base = base
2015-05-10 07:15:17 +00:00
this.vers = vers
2015-05-10 05:14:15 +00:00
2015-05-09 13:48:08 +00:00
return nil
2015-05-09 04:59:38 +00:00
}
2015-05-10 07:15:17 +00:00
func (this *database) save() error {
return nil
}
2015-05-10 10:41:15 +00:00
func (this *database) versions(dirs []string) ([]*version, error) {
2015-05-10 07:15:17 +00:00
var vers []*version
2015-05-09 13:48:08 +00:00
2015-05-10 07:15:17 +00:00
var parent *version
2015-05-10 05:14:15 +00:00
for _, dir := range dirs {
2015-05-10 07:15:17 +00:00
ver, err := newVersion(dir, parent)
2015-05-10 05:14:15 +00:00
if err != nil {
return nil, err
}
2015-05-09 13:48:08 +00:00
2015-05-10 07:15:17 +00:00
vers = append(vers, ver)
parent = ver
2015-05-10 05:14:15 +00:00
}
2015-05-10 07:15:17 +00:00
return vers, nil
2015-05-09 13:48:08 +00:00
}
2015-05-10 10:41:15 +00:00
func (this *database) lastVersion() *version {
count := len(this.vers)
if count == 0 {
return nil
}
return this.vers[count-1]
}
2015-05-10 07:15:17 +00:00
func (this *database) scan(dir string) ([]string, error) {
2015-05-09 04:59:38 +00:00
nodes, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}
2015-05-10 05:14:15 +00:00
var dirs []string
2015-05-09 04:59:38 +00:00
for _, node := range nodes {
2015-05-10 05:14:15 +00:00
if node.IsDir() {
dirs = append(dirs, node.Name())
2015-05-09 13:48:08 +00:00
}
2015-05-09 04:59:38 +00:00
}
2015-05-08 09:28:53 +00:00
2015-05-10 05:14:15 +00:00
return dirs, nil
2015-05-08 09:28:53 +00:00
}