[#762] storage/shard: Try to read headers from write-cache

Shard should try to read object headers from write-cache if it is enabled.

Extend `writecache.Cache` interface with `Head` method. Call the method in
`Shard.Head` if `Shard.hasWriteCache` returns true.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
This commit is contained in:
Leonard Lyubich 2021-08-31 14:04:58 +03:00 committed by Leonard Lyubich
parent aa2151fbeb
commit 3f293cb55e
2 changed files with 27 additions and 3 deletions

View file

@ -1,6 +1,9 @@
package shard
import (
"errors"
"fmt"
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase"
@ -48,13 +51,33 @@ func (r *HeadRes) Object() *object.Object {
//
// Returns any error encountered.
func (s *Shard) Head(prm *HeadPrm) (*HeadRes, error) {
// object can be saved in write-cache (if enabled) or in metabase
if s.hasWriteCache() {
// try to read header from write-cache
header, err := s.writeCache.Head(prm.addr)
if err == nil {
return &HeadRes{
obj: header,
}, nil
} else if !errors.Is(err, object.ErrNotFound) {
// in this case we think that object is presented in write-cache, but corrupted
return nil, fmt.Errorf("could not read header from write-cache: %w", err)
}
// otherwise object seems to be flushed to metabase
}
headParams := new(meta.GetPrm).
WithAddress(prm.addr).
WithRaw(prm.raw)
head, err := s.metaBase.Get(headParams)
res, err := s.metaBase.Get(headParams)
if err != nil {
return nil, err
}
return &HeadRes{
obj: head.Header(),
}, err
obj: res.Header(),
}, nil
}

View file

@ -13,6 +13,7 @@ import (
// Cache represents write-cache for objects.
type Cache interface {
Get(*objectSDK.Address) (*object.Object, error)
Head(*objectSDK.Address) (*object.Object, error)
Delete(*objectSDK.Address) error
Put(*object.Object) error