feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/application/conversation/build_chunk_event.go

@@ -0,0 +1,51 @@
+/*
+ * 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 conversation
+
+import (
+	"encoding/json"
+
+	"github.com/hertz-contrib/sse"
+
+	"github.com/coze-dev/coze-studio/backend/api/model/conversation/run"
+)
+
+func buildDoneEvent(event string) *sse.Event {
+	return &sse.Event{
+		Event: event,
+	}
+}
+
+func buildErrorEvent(errCode int64, errMsg string) *sse.Event {
+	errData := run.ErrorData{
+		Code: errCode,
+		Msg:  errMsg,
+	}
+	ed, _ := json.Marshal(errData)
+
+	return &sse.Event{
+		Event: run.RunEventError,
+		Data:  ed,
+	}
+}
+
+func buildMessageChunkEvent(event string, chunkMsg []byte) *sse.Event {
+	return &sse.Event{
+		Event: event,
+		Data:  chunkMsg,
+	}
+}