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cache: backend add List method and a cache clear functionality
* removes files which are no longer in the repository, including index files, snapshot files and pack files from the cache. cache: fix ids set initialisation with NewIDSet()
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parent
33c670dd7a
commit
f66624f5bf
40
internal/backend/cache/backend.go
vendored
40
internal/backend/cache/backend.go
vendored
@ -2,11 +2,14 @@ package cache
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import (
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"context"
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"fmt"
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"io"
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"os"
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"sync"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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)
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// Backend wraps a restic.Backend and adds a cache.
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@ -215,3 +218,40 @@ func (b *Backend) IsNotExist(err error) bool {
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func (b *Backend) Unwrap() backend.Backend {
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return b.Backend
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}
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func (b *Backend) List(ctx context.Context, t backend.FileType, fn func(f backend.FileInfo) error) error {
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if !b.Cache.canBeCached(t) {
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return b.Backend.List(ctx, t, fn)
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}
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// will contain the IDs of the files that are in the repository
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ids := restic.NewIDSet()
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// wrap the original function to also add the file to the ids set
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wrapFn := func(f backend.FileInfo) error {
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id, err := restic.ParseID(f.Name)
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if err != nil {
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// returning error here since, if we cannot parse the ID, the file
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// is invalid and the list must exit.
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return err
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}
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ids.Insert(id)
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// execute the original function
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return fn(f)
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}
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err := b.Backend.List(ctx, t, wrapFn)
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if err != nil {
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return err
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}
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// clear the cache for files that are not in the repo anymore, ignore errors
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err = b.Cache.Clear(t, ids)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error clearing %s files in cache: %v\n", t.String(), err)
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}
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return nil
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}
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