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cache: Simplify loadFromCacheOrDelegate

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This commit is contained in:
Michael Eischer 2021-09-20 22:08:05 +02:00
parent 5c6b6edefe
commit aa3b1925b4
1 changed files with 12 additions and 16 deletions
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26
internal/cache/backend.go vendored
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@ -131,21 +131,19 @@ func (b *Backend) cacheFile(ctx context.Context, h restic.Handle) error {
return nil
}
// loadFromCacheOrDelegate will try to load the file from the cache, and fall
// back to the backend if that fails.
func (b *Backend) loadFromCacheOrDelegate(ctx context.Context, h restic.Handle, length int, offset int64, consumer func(rd io.Reader) error) error {
// loadFromCache will try to load the file from the cache.
func (b *Backend) loadFromCache(ctx context.Context, h restic.Handle, length int, offset int64, consumer func(rd io.Reader) error) (bool, error) {
rd, err := b.Cache.load(h, length, offset)
if err != nil {
debug.Log("error caching %v: %v, falling back to backend", h, err)
return b.Backend.Load(ctx, h, length, offset, consumer)
return false, err
}
err = consumer(rd)
if err != nil {
_ = rd.Close() // ignore secondary errors
return err
return true, err
}
return rd.Close()
return true, rd.Close()
}
// Load loads a file from the cache or the backend.
@ -161,15 +159,10 @@ func (b *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
}
// try loading from cache without checking that the handle is actually cached
rd, err := b.Cache.load(h, length, offset)
if err == nil {
err = consumer(rd)
if err != nil {
_ = rd.Close() // ignore secondary errors
inCache, err := b.loadFromCache(ctx, h, length, offset, consumer)
if inCache {
return 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
@ -181,7 +174,10 @@ func (b *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
debug.Log("auto-store %v in the cache", h)
err = b.cacheFile(ctx, h)
if err == nil {
return b.loadFromCacheOrDelegate(ctx, h, length, offset, consumer)
inCache, err = b.loadFromCache(ctx, h, length, offset, consumer)
if inCache {
return err
}
}
debug.Log("error caching %v: %v, falling back to backend", h, err)