frostfs-node/pkg/local_object_storage/writecache/get.go
Evgenii Stratonikov 59de521fd1 [] blobstor: implement write-cache
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-04-29 17:36:36 +03:00

51 lines
960 B
Go

package writecache
import (
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"go.etcd.io/bbolt"
)
// Get returns object from write-cache.
func (c *cache) Get(addr *objectSDK.Address) (*object.Object, error) {
saddr := addr.String()
c.mtx.RLock()
for i := range c.mem {
if saddr == c.mem[i].addr {
obj := c.mem[i].obj
c.mtx.RUnlock()
return obj, nil
}
}
c.mtx.RUnlock()
var value []byte
_ = c.db.View(func(tx *bbolt.Tx) error {
b := tx.Bucket(defaultBucket)
val := b.Get([]byte(saddr))
if val != nil {
value = cloneBytes(val)
}
return nil
})
if value != nil {
obj := object.New()
c.flushed.Get(saddr)
return obj, obj.Unmarshal(value)
}
data, err := c.fsTree.Get(addr)
if err != nil {
return nil, object.ErrNotFound
}
obj := object.New()
if err := obj.Unmarshal(data); err != nil {
return nil, err
}
c.flushed.Get(saddr)
return obj, nil
}