7a93237069
- 后端: 新增 AttachmentContextBuilder 解析图片/PDF 摘要并拼入 LLM 上下文; ai_chat_endpoints 扩展附件接口; 新增 ReportAnalysisService - 前端: 新增历史会话页与 conversation_history_provider; chat 链路支持附件展示与回放 - UI: 重构 medication_checkin / notification_center / profile / health_drawer 等多页面 - 配置: api_client baseUrl 适配当前 WiFi IP
93 lines
2.6 KiB
Dart
93 lines
2.6 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:dio/dio.dart';
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import '../core/api_client.dart';
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/// 跨平台 SSE 流处理（基于 Dio 流式响应，支持 Android/iOS/Web）
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class SseHandler {
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/// 连接 SSE 端点，返回事件流
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static Stream<Map<String, dynamic>> connect({
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required String agentType,
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required String message,
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String? conversationId,
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String? imageUrl,
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String? pdfUrl,
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required String token,
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}) {
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final params = <String, String>{
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'message': message,
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'token': token,
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};
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if (conversationId != null) {
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params['conversationId'] = conversationId;
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}
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if (imageUrl != null && imageUrl.isNotEmpty) {
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params['imageUrl'] = imageUrl;
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}
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if (pdfUrl != null && pdfUrl.isNotEmpty) {
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params['pdfUrl'] = pdfUrl;
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}
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final query = params.entries
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.map((e) => '${e.key}=${Uri.encodeComponent(e.value)}')
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.join('&');
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final url = '$baseUrl/api/ai/$agentType/chat?$query';
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final controller = StreamController<Map<String, dynamic>>();
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_connect(controller, url);
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return controller.stream;
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}
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static Future<void> _connect(
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StreamController<Map<String, dynamic>> controller,
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String url,
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) async {
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try {
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final dio = Dio(BaseOptions(
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connectTimeout: const Duration(seconds: 15),
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receiveTimeout: const Duration(minutes: 5),
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));
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final response = await dio.get(
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url,
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options: Options(responseType: ResponseType.stream),
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);
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final stream = response.data.stream as Stream<List<int>>;
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var buffer = '';
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await for (final chunk in stream) {
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if (controller.isClosed) break;
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final text = utf8.decode(chunk, allowMalformed: true);
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buffer += text;
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// 按行解析 SSE 数据
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while (buffer.contains('\n')) {
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final newlineIdx = buffer.indexOf('\n');
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var line = buffer.substring(0, newlineIdx).trim();
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buffer = buffer.substring(newlineIdx + 1);
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if (line.isEmpty || !line.startsWith('data: ')) continue;
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final data = line.substring(6);
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if (data == '[DONE]') {
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controller.close();
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return;
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}
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try {
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controller.add(jsonDecode(data) as Map<String, dynamic>);
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} catch (_) {
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// 跳过无法解析的行
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}
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}
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}
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controller.close();
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} catch (e) {
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if (!controller.isClosed) {
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controller.add({'action': 'error', 'message': e.toString()});
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controller.close();
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}
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}
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}
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}
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