83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
package policy
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import (
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"context"
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"math/rand"
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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("rand", &Rand{})
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}
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// Rand stands for random
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// Calls all and then randomizes. Returns one candidate.
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type Rand struct {
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All
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}
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func (p *Rand) rand(upstreams []*upstream.Fs) *upstream.Fs {
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return upstreams[rand.Intn(len(upstreams))]
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}
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func (p *Rand) randEntries(entries []upstream.Entry) upstream.Entry {
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return entries[rand.Intn(len(entries))]
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}
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// Action category policy, governing the modification of files and directories
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func (p *Rand) Action(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
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upstreams, err := p.All.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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return []*upstream.Fs{p.rand(upstreams)}, nil
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}
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// ActionEntries is ACTION category policy but receiving a set of candidate entries
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func (p *Rand) ActionEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
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entries, err := p.All.ActionEntries(entries...)
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if err != nil {
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return nil, err
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}
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return []upstream.Entry{p.randEntries(entries)}, nil
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}
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// Create category policy, governing the creation of files and directories
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func (p *Rand) Create(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
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upstreams, err := p.All.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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return []*upstream.Fs{p.rand(upstreams)}, nil
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}
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// CreateEntries is CREATE category policy but receiving a set of candidate entries
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func (p *Rand) CreateEntries(entries ...upstream.Entry) ([]upstream.Entry, error) {
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entries, err := p.All.CreateEntries(entries...)
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if err != nil {
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return nil, err
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}
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return []upstream.Entry{p.randEntries(entries)}, nil
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}
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// Search category policy, governing the access to files and directories
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func (p *Rand) 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.rand(upstreams), nil
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}
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// SearchEntries is SEARCH category policy but receiving a set of candidate entries
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func (p *Rand) 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.randEntries(entries), nil
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}
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