From 62b2769a66439d1c0df3deb43067c81172b62273 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Mon, 16 May 2022 16:02:35 +0300
Subject: [PATCH] [#1333] local_object_storage: Support ReadOnly mode in
 pilorama

The tricky part here is the engine itself: we stop iteration on
`ErrReadOnly` because it is better to synchronize the shard later than
to have partial trees stored in 2 shards.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 pkg/local_object_storage/engine/tree.go | 12 ++++++++++++
 pkg/local_object_storage/shard/tree.go  |  9 +++++++++
 2 files changed, 21 insertions(+)

diff --git a/pkg/local_object_storage/engine/tree.go b/pkg/local_object_storage/engine/tree.go
index 43ac27f5a..415761321 100644
--- a/pkg/local_object_storage/engine/tree.go
+++ b/pkg/local_object_storage/engine/tree.go
@@ -1,7 +1,10 @@
 package engine
 
 import (
+	"errors"
+
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/pilorama"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
 	cidSDK "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"go.uber.org/zap"
 )
@@ -19,6 +22,9 @@ func (e *StorageEngine) TreeMove(d pilorama.CIDDescriptor, treeID string, m *pil
 				zap.Stringer("cid", d.CID),
 				zap.String("tree", treeID),
 				zap.String("err", err.Error()))
+			if errors.Is(err, shard.ErrReadOnlyMode) {
+				return nil, err
+			}
 			continue
 		}
 		return lm, nil
@@ -37,6 +43,9 @@ func (e *StorageEngine) TreeAddByPath(d pilorama.CIDDescriptor, treeID string, a
 				zap.Stringer("cid", d.CID),
 				zap.String("tree", treeID),
 				zap.String("err", err.Error()))
+			if errors.Is(err, shard.ErrReadOnlyMode) {
+				return nil, err
+			}
 			continue
 		}
 		return lm, nil
@@ -54,6 +63,9 @@ func (e *StorageEngine) TreeApply(d pilorama.CIDDescriptor, treeID string, m *pi
 				zap.Stringer("cid", d.CID),
 				zap.String("tree", treeID),
 				zap.String("err", err.Error()))
+			if errors.Is(err, shard.ErrReadOnlyMode) {
+				return err
+			}
 			continue
 		}
 		return nil
diff --git a/pkg/local_object_storage/shard/tree.go b/pkg/local_object_storage/shard/tree.go
index fae5e5341..33f120a91 100644
--- a/pkg/local_object_storage/shard/tree.go
+++ b/pkg/local_object_storage/shard/tree.go
@@ -9,16 +9,25 @@ var _ pilorama.Forest = (*Shard)(nil)
 
 // TreeMove implements the pilorama.Forest interface.
 func (s *Shard) TreeMove(d pilorama.CIDDescriptor, treeID string, m *pilorama.Move) (*pilorama.LogMove, error) {
+	if s.GetMode() != ModeReadWrite {
+		return nil, ErrReadOnlyMode
+	}
 	return s.pilorama.TreeMove(d, treeID, m)
 }
 
 // TreeAddByPath implements the pilorama.Forest interface.
 func (s *Shard) TreeAddByPath(d pilorama.CIDDescriptor, treeID string, attr string, path []string, meta []pilorama.KeyValue) ([]pilorama.LogMove, error) {
+	if s.GetMode() != ModeReadWrite {
+		return nil, ErrReadOnlyMode
+	}
 	return s.pilorama.TreeAddByPath(d, treeID, attr, path, meta)
 }
 
 // TreeApply implements the pilorama.Forest interface.
 func (s *Shard) TreeApply(d pilorama.CIDDescriptor, treeID string, m *pilorama.Move) error {
+	if s.GetMode() != ModeReadWrite {
+		return ErrReadOnlyMode
+	}
 	return s.pilorama.TreeApply(d, treeID, m)
 }