116 lines
3.2 KiB
Go
116 lines
3.2 KiB
Go
package policy
|
|
|
|
import (
|
|
"context"
|
|
"math"
|
|
|
|
"github.com/rclone/rclone/backend/union/upstream"
|
|
"github.com/rclone/rclone/fs"
|
|
)
|
|
|
|
func init() {
|
|
registerPolicy("eplno", &EpLno{})
|
|
}
|
|
|
|
// EpLno stands for existing path, least number of objects
|
|
// Of all the candidates on which the path exists choose the one with the least number of objects
|
|
type EpLno struct {
|
|
EpAll
|
|
}
|
|
|
|
func (p *EpLno) lno(upstreams []*upstream.Fs) (*upstream.Fs, error) {
|
|
var minNumObj int64 = math.MaxInt64
|
|
var lnoUpstream *upstream.Fs
|
|
for _, u := range upstreams {
|
|
numObj, err := u.GetNumObjects()
|
|
if err != nil {
|
|
fs.LogPrintf(fs.LogLevelNotice, nil,
|
|
"Number of Objects is not supported for upstream %s, treating as 0", u.Name())
|
|
}
|
|
if minNumObj > numObj {
|
|
minNumObj = numObj
|
|
lnoUpstream = u
|
|
}
|
|
}
|
|
if lnoUpstream == nil {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return lnoUpstream, nil
|
|
}
|
|
|
|
func (p *EpLno) lnoEntries(entries []upstream.Entry) (upstream.Entry, error) {
|
|
var minNumObj int64 = math.MaxInt64
|
|
var lnoEntry upstream.Entry
|
|
for _, e := range entries {
|
|
numObj, err := e.UpstreamFs().GetNumObjects()
|
|
if err != nil {
|
|
fs.LogPrintf(fs.LogLevelNotice, nil,
|
|
"Number of Objects is not supported for upstream %s, treating as 0", e.UpstreamFs().Name())
|
|
}
|
|
if minNumObj > numObj {
|
|
minNumObj = numObj
|
|
lnoEntry = e
|
|
}
|
|
}
|
|
return lnoEntry, nil
|
|
}
|
|
|
|
// Action category policy, governing the modification of files and directories
|
|
func (p *EpLno) Action(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
|
|
upstreams, err := p.EpAll.Action(ctx, upstreams, path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
u, err := p.lno(upstreams)
|
|
return []*upstream.Fs{u}, err
|
|
}
|
|
|
|
// ActionEntries is ACTION category policy but receiving a set of candidate entries
|
|
func (p *EpLno) ActionEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
|
|
entries, err := p.EpAll.ActionEntries(entries...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
e, err := p.lnoEntries(entries)
|
|
return []upstream.Entry{e}, err
|
|
}
|
|
|
|
// Create category policy, governing the creation of files and directories
|
|
func (p *EpLno) Create(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
|
|
upstreams, err := p.EpAll.Create(ctx, upstreams, path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
u, err := p.lno(upstreams)
|
|
return []*upstream.Fs{u}, err
|
|
}
|
|
|
|
// CreateEntries is CREATE category policy but receiving a set of candidate entries
|
|
func (p *EpLno) CreateEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
|
|
entries, err := p.EpAll.CreateEntries(entries...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
e, err := p.lnoEntries(entries)
|
|
return []upstream.Entry{e}, err
|
|
}
|
|
|
|
// Search category policy, governing the access to files and directories
|
|
func (p *EpLno) Search(ctx context.Context, upstreams []*upstream.Fs, path string) (*upstream.Fs, error) {
|
|
if len(upstreams) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
upstreams, err := p.epall(ctx, upstreams, path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return p.lno(upstreams)
|
|
}
|
|
|
|
// SearchEntries is SEARCH category policy but receiving a set of candidate entries
|
|
func (p *EpLno) SearchEntries(entries ...upstream.Entry) (upstream.Entry, error) {
|
|
if len(entries) == 0 {
|
|
return nil, fs.ErrorObjectNotFound
|
|
}
|
|
return p.lnoEntries(entries)
|
|
}
|