feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/workflow/internal/nodes/loop/break.go

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package loop
+
+import (
+	"context"
+
+	"github.com/cloudwego/eino/compose"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/crossdomain/variable"
+)
+
+type Break struct {
+	parentIntermediateStore variable.Store
+}
+
+func NewBreak(_ context.Context, store variable.Store) (*Break, error) {
+	return &Break{
+		parentIntermediateStore: store,
+	}, nil
+}
+
+const BreakKey = "$break"
+
+func (b *Break) DoBreak(ctx context.Context, _ map[string]any) (map[string]any, error) {
+	err := b.parentIntermediateStore.Set(ctx, compose.FieldPath{BreakKey}, true)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{}, nil
+}