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cache: Just try to open cache entry without calling stat first

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Instead of first checking whether a file is in the repository cache and
then opening it, we just can open the file. This saves one stat call. If
the file is in the cache, everything is fine and otherwise the code
follows its normal fallback path.
This commit is contained in:
Michael Eischer 2022-08-19 20:59:06 +02:00
parent 0d9ac78437
commit ce902aac67
2 changed files with 11 additions and 13 deletions
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22
internal/cache/backend.go vendored
View File

@ -160,19 +160,17 @@ func (b *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
debug.Log("downloading %v finished", h) debug.Log("downloading %v finished", h)
} }
if b.Cache.Has(h) { // try loading from cache without checking that the handle is actually cached
debug.Log("Load(%v, %v, %v) from cache", h, length, offset) rd, err := b.Cache.load(h, length, offset)
rd, err := b.Cache.load(h, length, offset) if err == nil {
if err == nil { err = consumer(rd)
err = consumer(rd) if err != nil {
if err != nil { _ = rd.Close() // ignore secondary errors
_ = rd.Close() // ignore secondary errors return err
return err
}
return rd.Close()
} }
debug.Log("error loading %v from cache: %v", h, err) return rd.Close()
} }
debug.Log("error loading %v from cache: %v", h, err)
// if we don't automatically cache this file type, fall back to the backend // if we don't automatically cache this file type, fall back to the backend
if !autoCacheTypes(h) { if !autoCacheTypes(h) {
@ -181,7 +179,7 @@ func (b *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
} }
debug.Log("auto-store %v in the cache", h) debug.Log("auto-store %v in the cache", h)
err := b.cacheFile(ctx, h) err = b.cacheFile(ctx, h)
if err == nil { if err == nil {
return b.loadFromCacheOrDelegate(ctx, h, length, offset, consumer) return b.loadFromCacheOrDelegate(ctx, h, length, offset, consumer)
} }

2
internal/cache/file.go vendored
View File

@ -43,7 +43,7 @@ type readCloser struct {
// given handle. rd must be closed after use. If an error is returned, the // given handle. rd must be closed after use. If an error is returned, the
// ReadCloser is nil. // ReadCloser is nil.
func (c *Cache) load(h restic.Handle, length int, offset int64) (io.ReadCloser, error) { func (c *Cache) load(h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
debug.Log("Load from cache: %v", h) debug.Log("Load(%v, %v, %v) from cache", h, length, offset)
if !c.canBeCached(h.Type) { if !c.canBeCached(h.Type) {
return nil, errors.New("cannot be cached") return nil, errors.New("cannot be cached")
} }