[#1085] writecache: persist in-memory objects before shutdown

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/shard/shutdown_test.go

@@ -0,0 +1,52 @@
+package shard_test
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/writecache"
+	cidtest "github.com/nspcc-dev/neofs-sdk-go/container/id/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestWriteCacheObjectLoss(t *testing.T) {
+	const (
+		smallSize = 1024
+		objCount  = 100
+	)
+
+	objects := make([]*object.Object, objCount)
+	for i := range objects {
+		size := smallSize
+		//if i%2 == 0 {
+		size = smallSize / 2
+		//}
+		data := make([]byte, size)
+		rand.Read(data)
+
+		objects[i] = generateRawObjectWithPayload(cidtest.ID(), data).Object()
+	}
+
+	dir := t.TempDir()
+	wcOpts := []writecache.Option{
+		writecache.WithSmallObjectSize(smallSize),
+		writecache.WithMaxObjectSize(smallSize * 2)}
+
+	sh := newCustomShard(t, dir, true, wcOpts...)
+
+	for i := range objects {
+		_, err := sh.Put(new(shard.PutPrm).WithObject(objects[i]))
+		require.NoError(t, err)
+	}
+	require.NoError(t, sh.Close())
+
+	sh = newCustomShard(t, dir, true, wcOpts...)
+	defer releaseShard(sh, t)
+
+	for i := range objects {
+		_, err := sh.Get(new(shard.GetPrm).WithAddress(objects[i].Address()))
+		require.NoError(t, err, i)
+	}
+}