feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/agent/singleagent/internal/agentflow/node_chat_model.go

@@ -0,0 +1,73 @@
+/*
+ * 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 agentflow
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/coze-dev/coze-studio/backend/crossdomain/contract/crossmodelmgr"
+	"github.com/coze-dev/coze-studio/backend/domain/modelmgr"
+	"github.com/coze-dev/coze-studio/backend/infra/contract/chatmodel"
+	"github.com/coze-dev/coze-studio/backend/pkg/errorx"
+	"github.com/coze-dev/coze-studio/backend/types/errno"
+)
+
+type config struct {
+	modelFactory chatmodel.Factory
+	modelInfo    *crossmodelmgr.Model
+}
+
+func newChatModel(ctx context.Context, conf *config) (chatmodel.ToolCallingChatModel, error) {
+
+	if conf.modelInfo == nil {
+		return nil, fmt.Errorf("model is nil")
+	}
+	modelDetail := conf.modelInfo
+	modelMeta := modelDetail.Meta
+
+	if !conf.modelFactory.SupportProtocol(modelMeta.Protocol) {
+		return nil, errorx.New(errno.ErrAgentSupportedChatModelProtocol,
+			errorx.KV("protocol", string(modelMeta.Protocol)))
+	}
+
+	cm, err := conf.modelFactory.CreateChatModel(ctx, modelDetail.Meta.Protocol, conf.modelInfo.Meta.ConnConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	return cm, nil
+}
+
+func loadModelInfo(ctx context.Context, modelID int64) (*crossmodelmgr.Model, error) {
+	if modelID == 0 {
+		return nil, fmt.Errorf("modelID is required")
+	}
+
+	models, err := crossmodelmgr.DefaultSVC().MGetModelByID(ctx, &modelmgr.MGetModelRequest{
+		IDs: []int64{modelID},
+	})
+
+	if err != nil {
+		return nil, fmt.Errorf("MGetModelByID failed, err=%w", err)
+	}
+	if len(models) == 0 {
+		return nil, fmt.Errorf("model not found, modelID=%v", modelID)
+	}
+
+	return models[0], nil
+}