feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/workflow/internal/nodes/parent_intermediate.go

@@ -0,0 +1,99 @@
+/*
+ * 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 nodes
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/crossdomain/variable"
+
+	"github.com/cloudwego/eino/compose"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity/vo"
+)
+
+type ParentIntermediateStore struct {
+	mu sync.RWMutex
+}
+
+type IntermediateVarKey struct{}
+
+func (p *ParentIntermediateStore) Init(_ context.Context) {
+	return
+}
+
+func (p *ParentIntermediateStore) Get(ctx context.Context, path compose.FieldPath, opts ...variable.OptionFn) (any, error) {
+	defer p.mu.RUnlock()
+	p.mu.RLock()
+
+	if len(path) != 1 {
+		return nil, fmt.Errorf("invalid path: %v", path)
+	}
+
+	ivs := getIntermediateVars(ctx)
+	v, ok := ivs.vars[path[0]]
+	if !ok {
+		return nil, fmt.Errorf("variable not found: %s", path[0])
+	}
+
+	if *v == nil {
+		return ivs.types[path[0]].Zero(), nil
+	}
+
+	return *v, nil
+}
+
+func (p *ParentIntermediateStore) Set(ctx context.Context, path compose.FieldPath, value any, opts ...variable.OptionFn) error {
+	defer p.mu.Unlock()
+	p.mu.Lock()
+
+	if len(path) != 1 {
+		return fmt.Errorf("invalid path: %v", path)
+	}
+
+	ivs := getIntermediateVars(ctx)
+	v, ok := ivs.vars[path[0]]
+	if !ok {
+		return fmt.Errorf("variable not found: %s", path[0])
+	}
+
+	if value == nil {
+		*v = ivs.types[path[0]].Zero()
+	} else {
+		*v = value
+	}
+
+	return nil
+}
+
+type intermediateVar struct {
+	vars  map[string]*any
+	types map[string]*vo.TypeInfo
+}
+
+func InitIntermediateVars(ctx context.Context, vars map[string]*any, typeInfos map[string]*vo.TypeInfo) context.Context {
+	return context.WithValue(ctx, IntermediateVarKey{}, &intermediateVar{
+		vars:  vars,
+		types: typeInfos,
+	})
+}
+
+func getIntermediateVars(ctx context.Context) *intermediateVar {
+	return ctx.Value(IntermediateVarKey{}).(*intermediateVar)
+}