[#211] blobstor: Define Iterate operation

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/blobstor/iterate.go

@@ -0,0 +1,33 @@
+package blobstor
+
+import (
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
+)
+
+// IterationHandler represents the action to be performed on each iteration.
+type IterationHandler func(*objectSDK.Address, *blobovnicza.ID) error
+
+// IteratePrm groups the parameters of Iterate operation.
+type IteratePrm struct {
+	handler IterationHandler
+}
+
+// IterateRes groups resulting values of Iterate operation.
+type IterateRes struct{}
+
+// SetIterationHandler sets the action to be performed on each iteration.
+func (i *IteratePrm) SetIterationHandler(h IterationHandler) {
+	i.handler = h
+}
+
+// Iterate traverses the storage over the stored objects and calls the handler
+// on each element.
+//
+// Returns any error encountered that
+// did not allow to completely iterate over the storage.
+//
+// If handler returns an error, method returns it immediately.
+func (b *BlobStor) Iterate(prm *IteratePrm) (*IterateRes, error) {
+	panic("implement me")
+}