[#1818] writecache: Reuse FSTree flushing code between flushes

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

pkg/local_object_storage/writecache/flush.go

@@ -137,47 +137,7 @@ func (c *cache) flushBigObjects() {
 				break
 			}
 
-			var prm common.IteratePrm
+			_ = c.flushFSTree(true)
-			prm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
-				sAddr := addr.EncodeToString()
-
-				if _, ok := c.store.flushed.Peek(sAddr); ok {
-					return nil
-				}
-
-				data, err := f()
-				if err != nil {
-					c.log.Error("can't read a file", zap.Stringer("address", addr))
-					return nil
-				}
-
-				c.mtx.Lock()
-				_, compress := c.compressFlags[sAddr]
-				c.mtx.Unlock()
-
-				var prm common.PutPrm
-				prm.Address = addr
-				prm.RawData = data
-				prm.DontCompress = !compress
-
-				if _, err := c.blobstor.Put(prm); err != nil {
-					c.log.Error("cant flush object to blobstor", zap.Error(err))
-					return nil
-				}
-
-				if compress {
-					c.mtx.Lock()
-					delete(c.compressFlags, sAddr)
-					c.mtx.Unlock()
-				}
-
-				// mark object as flushed
-				c.flushed.Add(sAddr, false)
-
-				return nil
-			}
-
-			_, _ = c.fsTree.Iterate(prm)
 
 			c.modeMtx.RUnlock()
 		case <-c.closeCh:
@@ -186,6 +146,59 @@ func (c *cache) flushBigObjects() {
 	}
 }
 
+func (c *cache) flushFSTree(ignoreErrors bool) error {
+	var prm common.IteratePrm
+	prm.IgnoreErrors = ignoreErrors
+	prm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
+		sAddr := addr.EncodeToString()
+
+		if _, ok := c.store.flushed.Peek(sAddr); ok {
+			return nil
+		}
+
+		data, err := f()
+		if err != nil {
+			if ignoreErrors {
+				c.log.Error("can't read a file", zap.Stringer("address", addr))
+				return nil
+			}
+			return err
+		}
+
+		var obj object.Object
+		err = obj.Unmarshal(data)
+		if err != nil {
+			if ignoreErrors {
+				c.log.Error("can't unmarshal an object", zap.Stringer("address", addr))
+				return nil
+			}
+			return err
+		}
+
+		var prm common.PutPrm
+		prm.Address = addr
+		prm.Object = &obj
+		prm.RawData = data
+
+		_, err = c.blobstor.Put(prm)
+		if err != nil {
+			if ignoreErrors {
+				c.log.Error("cant flush object to blobstor", zap.Error(err))
+				return nil
+			}
+			return err
+		}
+
+		// mark object as flushed
+		c.flushed.Add(sAddr, false)
+
+		return nil
+	}
+
+	_, err := c.fsTree.Iterate(prm)
+	return err
+}
+
 // flushWorker writes objects to the main storage.
 func (c *cache) flushWorker(_ int) {
 	defer c.wg.Done()
@@ -241,36 +254,7 @@ func (c *cache) Flush(ignoreErrors bool) error {
 }
 
 func (c *cache) flush(ignoreErrors bool) error {
-	var prm common.IteratePrm
+	if err := c.flushFSTree(ignoreErrors); err != nil {
-	prm.IgnoreErrors = ignoreErrors
-	prm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
-		_, ok := c.flushed.Peek(addr.EncodeToString())
-		if ok {
-			return nil
-		}
-
-		data, err := f()
-		if err != nil {
-			if ignoreErrors {
-				return nil
-			}
-			return err
-		}
-
-		var obj object.Object
-		err = obj.Unmarshal(data)
-		if err != nil {
-			if ignoreErrors {
-				return nil
-			}
-			return err
-		}
-
-		return c.flushObject(&obj)
-	}
-
-	_, err := c.fsTree.Iterate(prm)
-	if err != nil {
 		return err
 	}