feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/conversation/agentrun/internal/event.go

@@ -0,0 +1,78 @@
+/*
+ * 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 internal
+
+import (
+	"github.com/cloudwego/eino/schema"
+
+	"github.com/coze-dev/coze-studio/backend/domain/conversation/agentrun/entity"
+)
+
+type Event struct {
+}
+
+func NewEvent() *Event {
+	return &Event{}
+}
+
+func (e *Event) buildMessageEvent(runEvent entity.RunEvent, chunkMsgItem *entity.ChunkMessageItem) *entity.AgentRunResponse {
+	return &entity.AgentRunResponse{
+		Event:            runEvent,
+		ChunkMessageItem: chunkMsgItem,
+	}
+}
+
+func (e *Event) buildRunEvent(runEvent entity.RunEvent, chunkRunItem *entity.ChunkRunItem) *entity.AgentRunResponse {
+	return &entity.AgentRunResponse{
+		Event:        runEvent,
+		ChunkRunItem: chunkRunItem,
+	}
+}
+
+func (e *Event) buildErrEvent(runEvent entity.RunEvent, err *entity.RunError) *entity.AgentRunResponse {
+	return &entity.AgentRunResponse{
+		Event: runEvent,
+		Error: err,
+	}
+}
+
+func (e *Event) buildStreamDoneEvent() *entity.AgentRunResponse {
+
+	return &entity.AgentRunResponse{
+		Event: entity.RunEventStreamDone,
+	}
+}
+
+func (e *Event) SendRunEvent(runEvent entity.RunEvent, runItem *entity.ChunkRunItem, sw *schema.StreamWriter[*entity.AgentRunResponse]) {
+	resp := e.buildRunEvent(runEvent, runItem)
+	sw.Send(resp, nil)
+}
+
+func (e *Event) SendMsgEvent(runEvent entity.RunEvent, messageItem *entity.ChunkMessageItem, sw *schema.StreamWriter[*entity.AgentRunResponse]) {
+	resp := e.buildMessageEvent(runEvent, messageItem)
+	sw.Send(resp, nil)
+}
+
+func (e *Event) SendErrEvent(runEvent entity.RunEvent, sw *schema.StreamWriter[*entity.AgentRunResponse], err *entity.RunError) {
+	resp := e.buildErrEvent(runEvent, err)
+	sw.Send(resp, nil)
+}
+
+func (e *Event) SendStreamDoneEvent(sw *schema.StreamWriter[*entity.AgentRunResponse]) {
+	resp := e.buildStreamDoneEvent()
+	sw.Send(resp, nil)
+}