154 lines
3.1 KiB
Go
154 lines
3.1 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"sync"
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)
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//
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// verMeta
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//
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type verFmt struct {
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Deleted []string `json:"deleted"`
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}
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type verMeta struct {
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path string
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deleted map[string]bool
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modified bool
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mutex sync.Mutex
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}
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func newVerMeta(path string) (*verMeta, error) {
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meta := &verMeta{path, make(map[string]bool), false, sync.Mutex{}}
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if err := meta.load(); err != nil {
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return nil, err
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}
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return meta, nil
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}
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func (m *verMeta) filter(nodes verNodeMap) {
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for path, deleted := range m.deleted {
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if !deleted {
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continue
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}
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for name, node := range nodes {
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if strings.HasPrefix(node.path, path) {
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delete(nodes, name)
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}
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}
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}
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}
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func (m *verMeta) removeNode(path string) {
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m.mutex.Lock()
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m.deleted[path] = true
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m.mutex.Unlock()
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m.modified = true
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}
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func (m *verMeta) createNode(path string) {
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m.mutex.Lock()
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m.deleted[path] = false
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m.mutex.Unlock()
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m.modified = true
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}
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func (m *verMeta) modifyNode(path string) {
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m.modified = true
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}
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func (m *verMeta) load() error {
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if _, err := os.Stat(m.path); os.IsNotExist(err) {
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return nil
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}
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bytes, err := ioutil.ReadFile(m.path)
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if err != nil {
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return err
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}
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var vd verFmt
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if err := json.Unmarshal(bytes, &vd); err != nil {
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return err
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}
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m.deleted = make(map[string]bool)
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for _, path := range vd.Deleted {
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m.deleted[path] = true
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}
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m.modified = false
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return nil
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}
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func (m *verMeta) checkRedundantDel(child string) bool {
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parent := path.Dir(child)
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if parent == "/" {
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return false
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}
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if deleted, _ := m.deleted[parent]; deleted {
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return true
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}
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return m.checkRedundantDel(parent)
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}
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func (m *verMeta) save() error {
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if !m.modified {
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return nil
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}
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var vd verFmt
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for path, deleted := range m.deleted {
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if !deleted {
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continue
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}
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if m.checkRedundantDel(path) {
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continue
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}
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vd.Deleted = append(vd.Deleted, path)
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}
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js, err := json.Marshal(vd)
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if err != nil {
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return err
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}
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return ioutil.WriteFile(m.path, js, 0644)
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}
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