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