frostfs-node/pkg/local_object_storage/engine/put.go
Leonard Lyubich 9a4cd01eb8 [#186] localstorage: Implement utility functions over StorageEngine
Implement Put/Get/GetRange/Select/SelectAll functions over storage
engine. These functions are going to be used by Object service.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00

100 lines
2 KiB
Go

package engine
import (
"errors"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
"go.uber.org/zap"
)
// PutPrm groups the parameters of Put operation.
type PutPrm struct {
obj *object.Object
}
// PutRes groups resulting values of Put operation.
type PutRes struct{}
var errPutShard = errors.New("could not put object to any shard")
// WithObject is a Put option to set object to save.
//
// Option is required.
func (p *PutPrm) WithObject(obj *object.Object) *PutPrm {
if p != nil {
p.obj = obj
}
return p
}
// Put saves the object to local storage.
//
// Returns any error encountered that
// did not allow to completely save the object.
func (e *StorageEngine) Put(prm *PutPrm) (*PutRes, error) {
// choose shards through sorting by weight
sortedShards := e.sortShardsByWeight(prm.obj.Address())
// check object existence
if e.objectExists(prm.obj, sortedShards) {
return nil, nil
}
shPrm := new(shard.PutPrm)
// save the object into the "largest" possible shard
for _, sh := range sortedShards {
_, err := sh.Put(
shPrm.WithObject(prm.obj),
)
if err != nil {
// TODO: smth wrong with shard, need to be processed
e.log.Warn("could not save object in shard",
zap.Stringer("shard", sh.ID()),
zap.String("error", err.Error()),
)
} else {
return nil, nil
}
}
return nil, errPutShard
}
func (e *StorageEngine) objectExists(obj *object.Object, shards []*shard.Shard) bool {
exists := false
for _, sh := range shards {
res, err := sh.Exists(
new(shard.ExistsPrm).
WithAddress(obj.Address()),
)
if err != nil {
// TODO: smth wrong with shard, need to be processed
e.log.Warn("could not check object existence",
zap.String("error", err.Error()),
)
continue
}
if exists = res.Exists(); exists {
break
}
}
return exists
}
// Put writes provided object to local storage.
func Put(storage *StorageEngine, obj *object.Object) error {
_, err := storage.Put(new(PutPrm).
WithObject(obj),
)
return err
}