[#726] writecache: Fix small object flush for Badger

Do not marshal object twice.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/writecache/writecachebadger/cachebadger.go

@@ -21,7 +21,7 @@ type cache struct {
 	modeMtx sync.RWMutex
 
 	// flushCh is a channel with objects to flush.
-	flushCh chan *objectSDK.Object
+	flushCh chan objectInfo
 	// scheduled4Flush contains objects scheduled for flush via flushCh
 	// helps to avoid multiple flushing of one object
 	scheduled4Flush    map[oid.Address]struct{}
@@ -52,7 +52,7 @@ const (
 // New creates new writecache instance.
 func New(opts ...Option) writecache.Cache {
 	c := &cache{
-		flushCh:         make(chan *objectSDK.Object),
+		flushCh:         make(chan objectInfo),
 		mode:            mode.ReadWrite,
 		scheduled4Flush: map[oid.Address]struct{}{},
 

pkg/local_object_storage/writecache/writecachebadger/flush.go

@@ -85,7 +85,11 @@ func (c *collector) Send(buf *z.Buffer) error {
 		c.cache.scheduled4FlushMtx.Unlock()
 		c.scheduled++
 		select {
-		case c.cache.flushCh <- obj:
+		case c.cache.flushCh <- objectInfo{
+			addr: addr,
+			data: val,
+			obj:  obj,
+		}:
 		case <-c.cache.closeCh:
 			c.cancel()
 			return nil
@@ -175,22 +179,21 @@ func (c *cache) reportFlushError(msg string, addr string, err error) {
 func (c *cache) workerFlushSmall() {
 	defer c.wg.Done()
 
-	var obj *objectSDK.Object
+	var objInfo objectInfo
 	for {
 		// Give priority to direct put.
 		select {
-		case obj = <-c.flushCh:
+		case objInfo = <-c.flushCh:
 		case <-c.closeCh:
 			return
 		}
 
-		addr := objectCore.AddressOf(obj)
+		err := c.flushObject(context.TODO(), objInfo.obj, objInfo.data, writecache.StorageTypeDB)
-		err := c.flushObject(context.TODO(), obj, nil, writecache.StorageTypeDB)
 		if err == nil {
-			c.deleteFromDB([]internalKey{addr2key(addr)})
+			c.deleteFromDB([]internalKey{addr2key(objInfo.addr)})
 		}
 		c.scheduled4FlushMtx.Lock()
-		delete(c.scheduled4Flush, addr)
+		delete(c.scheduled4Flush, objInfo.addr)
 		c.scheduled4FlushMtx.Unlock()
 	}
 }