ovs: support delete_strict in FlowTransaction

ovs/openflow.go

@@ -71,8 +71,9 @@ type flowDirective struct {
 
 // Possible flowDirective directive values.
 const (
-	dirAdd    = "add"
-	dirDelete = "delete"
+	dirAdd          = "add"
+	dirDelete       = "delete"
+	dirDeleteStrict = "delete_strict"
 )
 
 // Add pushes zero or more Flows on to the transaction, to be added by
@@ -107,6 +108,21 @@ func (tx *FlowTransaction) Delete(flows ...*MatchFlow) {
 	tx.push(dirDelete, tms...)
 }
 
+// DeleteStrict is almost the same as Delete, except that the matching process
+// will be strict.
+func (tx *FlowTransaction) DeleteStrict(flows ...*MatchFlow) {
+	if tx.err != nil {
+		return
+	}
+
+	tms := make([]encoding.TextMarshaler, 0, len(flows))
+	for _, f := range flows {
+		tms = append(tms, f)
+	}
+
+	tx.push(dirDeleteStrict, tms...)
+}
+
 // push pushes zero or more encoding.TextMarshalers on to the transaction
 // (typically a Flow or MatchFlow).
 func (tx *FlowTransaction) push(directive string, flows ...encoding.TextMarshaler) {

ovs/openflow_test.go

@@ -143,9 +143,15 @@ func TestClientOpenFlowAddFlowBundleOK(t *testing.T) {
 	}
 
 	// Flows for deletion
-	matchFlows := []*MatchFlow{{
-		Cookie: 0xdeadbeef,
-	}}
+	matchFlows := []*MatchFlow{
+		{
+			Cookie: 0xdeadbeef,
+		},
+		{
+			Strict:   true,
+			Priority: 0,
+		},
+	}
 
 	pipe := Pipe(func(stdin io.Reader, cmd string, args ...string) ([]byte, error) {
 		if want, got := "ovs-ofctl", cmd; want != got {
@@ -1079,7 +1085,7 @@ func mustVerifyFlowBundle(t *testing.T, stdin io.Reader, flows []*Flow, matchFlo
 			}
 
 			gotFlows = append(gotFlows, flow)
-		case dirDelete:
+		case dirDelete, dirDeleteStrict:
 			gotMatchFlows = append(gotMatchFlows, string(bb[1]))
 		default:
 			t.Fatalf("unexpected directive in flow bundle: %q", keyword)