6b9e4f939d
Before this fix using the epff policy could double close a channel. The fix refactors the code to make that impossible and cancels any running queries when the first query is found.
111 lines
3 KiB
Go
111 lines
3 KiB
Go
package policy
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import (
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"context"
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"path"
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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("epff", &EpFF{})
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}
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// EpFF stands for existing path, first found
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// Given the order of the candidates, act on the first one found where the relative path exists.
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type EpFF struct{}
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func (p *EpFF) epff(ctx context.Context, upstreams []*upstream.Fs, filePath string) (*upstream.Fs, error) {
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ch := make(chan *upstream.Fs, len(upstreams))
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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for _, u := range upstreams {
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u := u // Closure
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go func() {
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rfs := u.RootFs
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remote := path.Join(u.RootPath, filePath)
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if findEntry(ctx, rfs, remote) == nil {
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u = nil
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}
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ch <- u
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}()
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}
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var u *upstream.Fs
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for range upstreams {
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u = <-ch
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if u != nil {
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break
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}
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}
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if u == nil {
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return nil, fs.ErrorObjectNotFound
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}
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return u, 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 *EpFF) Action(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 = filterRO(upstreams)
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if len(upstreams) == 0 {
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return nil, fs.ErrorPermissionDenied
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}
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u, err := p.epff(ctx, upstreams, path)
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return []*upstream.Fs{u}, err
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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 *EpFF) ActionEntries(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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entries = filterROEntries(entries)
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if len(entries) == 0 {
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return nil, fs.ErrorPermissionDenied
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}
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return entries[:1], 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 *EpFF) Create(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 = filterNC(upstreams)
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if len(upstreams) == 0 {
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return nil, fs.ErrorPermissionDenied
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}
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u, err := p.epff(ctx, upstreams, path+"/..")
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return []*upstream.Fs{u}, err
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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 *EpFF) CreateEntries(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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entries = filterNCEntries(entries)
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if len(entries) == 0 {
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return nil, fs.ErrorPermissionDenied
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}
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return entries[:1], 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 *EpFF) 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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return p.epff(ctx, upstreams, path)
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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 *EpFF) 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 entries[0], nil
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}
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