[#114] pool: Don't use part buffers when client cut is off

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

pool/parts_buffer_pool.go

@@ -58,9 +58,8 @@ func (p *PartsBufferPool) FreeBuffer(buff *PartBuffer) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
 
-	used := p.limit - p.available
-	if buff.len > used {
-		return fmt.Errorf("buffer size %d to free is greater than used: %d", buff.len, used)
+	if buff.len+p.available > p.limit {
+		return fmt.Errorf("buffer size %d to free is too large, available: %d, limit: %d", buff.len, p.available, p.limit)
 	}
 
 	p.available += buff.len

pool/pool.go

@@ -2250,17 +2250,12 @@ func (p *Pool) PutObject(ctx context.Context, prm PrmObjectPut) (oid.ID, error)
 		}
 	}
 
+	if prm.clientCut {
 		buff, err := p.partsBufferPool.GetBuffer()
 		if err != nil {
 			return oid.ID{}, fmt.Errorf("cannot get buffer for put operations: %w", err)
 		}
 
-	defer func() {
-		if errFree := p.partsBufferPool.FreeBuffer(buff); errFree != nil {
-			p.log(zap.WarnLevel, "failed to free part buffer", zap.Error(err))
-		}
-	}()
-
 		prm.setPartBuffer(buff.Buffer)
 
 		var ni netmap.NetworkInfo
@@ -2269,6 +2264,13 @@ func (p *Pool) PutObject(ctx context.Context, prm PrmObjectPut) (oid.ID, error)
 
 		prm.setNetworkInfo(ni)
 
+		defer func() {
+			if errFree := p.partsBufferPool.FreeBuffer(buff); errFree != nil {
+				p.log(zap.WarnLevel, "failed to free part buffer", zap.Error(err))
+			}
+		}()
+	}
+
 	id, err := ctxCall.client.objectPut(ctx, prm)
 	if err != nil {
 		// removes session token from cache in case of token error