[#176] localstore: Implement primary BlobStor

Implement primary local BLOB storage based on filesystem tree.

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

pkg/local_object_storage/blobstor/put.go

@@ -0,0 +1,61 @@
+package blobstor
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/pkg/errors"
+)
+
+// PutPrm groups the parameters of Put operation.
+type PutPrm struct {
+	obj *object.Object
+}
+
+// PutRes groups resulting values of Put operation.
+type PutRes struct{}
+
+// 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 in BLOB storage.
+//
+// Returns any error encountered that
+// did not allow to completely save the object.
+func (b *BlobStor) Put(prm *PutPrm) (*PutRes, error) {
+	b.mtx.Lock()
+	defer b.mtx.Unlock()
+
+	// marshal object
+	data, err := prm.obj.Marshal()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not marshal the object")
+	}
+
+	// compress object data
+	data = b.compressor(data)
+
+	// save object in fs tree
+	return nil, b.fsTree.put(prm.obj.Address(), data)
+}
+
+func (t *fsTree) put(addr *objectSDK.Address, data []byte) error {
+	p := t.treePath(addr)
+
+	if err := os.MkdirAll(path.Dir(p), t.perm); err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(p, data, t.perm)
+}