mirror of
https://github.com/rclone/rclone.git
synced 2024-12-05 07:20:35 +08:00
150 lines
3.9 KiB
Go
150 lines
3.9 KiB
Go
package policy
|
|
|
|
import (
|
|
"context"
|
|
"path"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/rclone/rclone/backend/union/upstream"
|
|
"github.com/rclone/rclone/fs"
|
|
)
|
|
|
|
func init() {
|
|
registerPolicy("newest", &Newest{})
|
|
}
|
|
|
|
// Newest policy picks the file / directory with the largest mtime
|
|
// It implies the existence of a path
|
|
type Newest struct {
|
|
EpAll
|
|
}
|
|
|
|
func (p *Newest) newest(ctx context.Context, upstreams []*upstream.Fs, filePath string) (*upstream.Fs, error) {
|
|
var wg sync.WaitGroup
|
|
ufs := make([]*upstream.Fs, len(upstreams))
|
|
mtimes := make([]time.Time, len(upstreams))
|
|
for i, u := range upstreams {
|
|
wg.Add(1)
|
|
i, u := i, u // Closure
|
|
go func() {
|
|
defer wg.Done()
|
|
rfs := u.RootFs
|
|
remote := path.Join(u.RootPath, filePath)
|
|
if e := findEntry(ctx, rfs, remote); e != nil {
|
|
ufs[i] = u
|
|
mtimes[i] = e.ModTime(ctx)
|
|
}
|
|
}()
|
|
}
|
|
wg.Wait()
|
|
maxMtime := time.Time{}
|
|
var newestFs *upstream.Fs
|
|
for i, u := range ufs {
|
|
if u != nil && mtimes[i].After(maxMtime) {
|
|
maxMtime = mtimes[i]
|
|
newestFs = u
|
|
}
|
|
}
|
|
if newestFs == nil {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return newestFs, nil
|
|
}
|
|
|
|
func (p *Newest) newestEntries(entries []upstream.Entry) (upstream.Entry, error) {
|
|
var wg sync.WaitGroup
|
|
mtimes := make([]time.Time, len(entries))
|
|
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
defer cancel()
|
|
for i, e := range entries {
|
|
wg.Add(1)
|
|
i, e := i, e // Closure
|
|
go func() {
|
|
defer wg.Done()
|
|
mtimes[i] = e.ModTime(ctx)
|
|
}()
|
|
}
|
|
wg.Wait()
|
|
maxMtime := time.Time{}
|
|
var newestEntry upstream.Entry
|
|
for i, t := range mtimes {
|
|
if t.After(maxMtime) {
|
|
maxMtime = t
|
|
newestEntry = entries[i]
|
|
}
|
|
}
|
|
if newestEntry == nil {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return newestEntry, nil
|
|
}
|
|
|
|
// Action category policy, governing the modification of files and directories
|
|
func (p *Newest) Action(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
upstreams = filterRO(upstreams)
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorPermissionDenied
|
|
}
|
|
u, err := p.newest(ctx, upstreams, path)
|
|
return []*upstream.Fs{u}, err
|
|
}
|
|
|
|
// ActionEntries is ACTION category policy but receiving a set of candidate entries
|
|
func (p *Newest) ActionEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
entries = filterROEntries(entries)
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorPermissionDenied
|
|
}
|
|
e, err := p.newestEntries(entries)
|
|
return []upstream.Entry{e}, err
|
|
}
|
|
|
|
// Create category policy, governing the creation of files and directories
|
|
func (p *Newest) Create(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
upstreams = filterNC(upstreams)
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorPermissionDenied
|
|
}
|
|
u, err := p.newest(ctx, upstreams, path+"/..")
|
|
return []*upstream.Fs{u}, err
|
|
}
|
|
|
|
// CreateEntries is CREATE category policy but receiving a set of candidate entries
|
|
func (p *Newest) CreateEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
entries = filterNCEntries(entries)
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorPermissionDenied
|
|
}
|
|
e, err := p.newestEntries(entries)
|
|
return []upstream.Entry{e}, err
|
|
}
|
|
|
|
// Search category policy, governing the access to files and directories
|
|
func (p *Newest) Search(ctx context.Context, upstreams []*upstream.Fs, path string) (*upstream.Fs, error) {
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return p.newest(ctx, upstreams, path)
|
|
}
|
|
|
|
// SearchEntries is SEARCH category policy but receiving a set of candidate entries
|
|
func (p *Newest) SearchEntries(entries ...upstream.Entry) (upstream.Entry, error) {
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return p.newestEntries(entries)
|
|
}
|