[#959] node: Set mode to shard's components when open it

Avoid opening database for `metabase` and `cache` in `Degraded` mode.

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/writecache/benchmark/writecache_test.go

@@ -8,6 +8,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/teststore"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
 	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
 	"github.com/stretchr/testify/require"
 )
@@ -75,7 +76,7 @@ func benchmarkPutPar(b *testing.B, cache writecache.Cache, size uint64) {
 }
 
 func benchmarkPutPrepare(b *testing.B, cache writecache.Cache) {
-	require.NoError(b, cache.Open(context.Background(), false), "opening")
+	require.NoError(b, cache.Open(context.Background(), mode.ReadWrite), "opening")
 	require.NoError(b, cache.Init(), "initializing")
 }
 

pkg/local_object_storage/writecache/cachebbolt.go

@@ -95,8 +95,14 @@ func (c *cache) DumpInfo() Info {
 }
 
 // Open opens and initializes database. Reads object counters from the ObjectCounters instance.
-func (c *cache) Open(_ context.Context, readOnly bool) error {
-	err := c.openStore(readOnly)
+func (c *cache) Open(_ context.Context, mode mode.Mode) error {
+	c.modeMtx.Lock()
+	defer c.modeMtx.Unlock()
+	c.mode = mode
+	if mode.NoMetabase() {
+		return nil
+	}
+	err := c.openStore(mode.ReadOnly())
 	if err != nil {
 		return metaerr.Wrap(err)
 	}

pkg/local_object_storage/writecache/flush_test.go

@@ -202,7 +202,7 @@ func newCache[Option any](
 	mb := meta.New(
 		meta.WithPath(filepath.Join(dir, "meta")),
 		meta.WithEpochState(dummyEpoch{}))
-	require.NoError(t, mb.Open(context.Background(), false))
+	require.NoError(t, mb.Open(context.Background(), mode.ReadWrite))
 	require.NoError(t, mb.Init())
 
 	bs := blobstor.New(blobstor.WithStorages([]blobstor.SubStorage{
@@ -213,11 +213,11 @@ func newCache[Option any](
 				fstree.WithDirNameLen(1)),
 		},
 	}))
-	require.NoError(t, bs.Open(context.Background(), false))
+	require.NoError(t, bs.Open(context.Background(), mode.ReadWrite))
 	require.NoError(t, bs.Init())
 
 	wc := createCacheFn(t, smallSize, mb, bs, opts...)
-	require.NoError(t, wc.Open(context.Background(), false))
+	require.NoError(t, wc.Open(context.Background(), mode.ReadWrite))
 	require.NoError(t, wc.Init())
 
 	// First set mode for metabase and blobstor to prevent background flushes.

pkg/local_object_storage/writecache/mode_test.go

@@ -0,0 +1,30 @@
+package writecache
+
+import (
+	"context"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMode(t *testing.T) {
+	t.Parallel()
+	wc := New(
+		WithLogger(test.NewLogger(t)),
+		WithFlushWorkersCount(2),
+		WithPath(t.TempDir()))
+
+	require.NoError(t, wc.Open(context.Background(), mode.DegradedReadOnly))
+	require.Nil(t, wc.(*cache).db)
+	require.NoError(t, wc.Init())
+	require.Nil(t, wc.(*cache).db)
+	require.NoError(t, wc.Close())
+
+	require.NoError(t, wc.Open(context.Background(), mode.Degraded))
+	require.Nil(t, wc.(*cache).db)
+	require.NoError(t, wc.Init())
+	require.Nil(t, wc.(*cache).db)
+	require.NoError(t, wc.Close())
+}

pkg/local_object_storage/writecache/writecache.go

@@ -39,7 +39,7 @@ type Cache interface {
 	Seal(context.Context, bool) error
 
 	Init() error
-	Open(ctx context.Context, readOnly bool) error
+	Open(ctx context.Context, mode mode.Mode) error
 	Close() error
 }