frostfs-node/pkg/local_object_storage/writecache/get.go

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package writecache
import (
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"github.com/nspcc-dev/neo-go/pkg/util/slice"
"go.etcd.io/bbolt"
)
// Get returns object from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Get(addr oid.Address) (*objectSDK.Object, error) {
saddr := addr.EncodeToString()
value, err := Get(c.db, []byte(saddr))
if err == nil {
obj := objectSDK.New()
c.flushed.Get(saddr)
return obj, obj.Unmarshal(value)
}
res, err := c.fsTree.Get(common.GetPrm{Address: addr})
if err != nil {
return nil, logicerr.Wrap(apistatus.ObjectNotFound{})
}
c.flushed.Get(saddr)
return res.Object, nil
}
// Head returns object header from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Head(addr oid.Address) (*objectSDK.Object, error) {
obj, err := c.Get(addr)
if err != nil {
return nil, err
}
return obj.CutPayload(), nil
}
// Get fetches object from the underlying database.
// Key should be a stringified address.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in db.
func Get(db *bbolt.DB, key []byte) ([]byte, error) {
var value []byte
err := db.View(func(tx *bbolt.Tx) error {
b := tx.Bucket(defaultBucket)
if b == nil {
return ErrNoDefaultBucket
}
value = b.Get(key)
if value == nil {
return logicerr.Wrap(apistatus.ObjectNotFound{})
}
value = slice.Copy(value)
return nil
})
return value, err
}