290 lines
8.2 KiB
JavaScript
290 lines
8.2 KiB
JavaScript
import { BASE_URL } from "../../constant/base";
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import { goLogin } from "@/hooks/useGoLogin";
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/// 请求流式数据的API
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const API = '/agent/assistant/chat';
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/**
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* 获取AI聊天流式信息（仅微信小程序支持）
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* @param {Object} params 请求参数
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* @param {Function} onChunk 回调，每收到一段数据触发
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* @returns {Object} 包含Promise和requestTask的对象
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*/
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// 在文件顶部重新设计状态追踪
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let requestTask = null;
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let isAborted = false;
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let currentPromiseReject = null;
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let lastRequestId = null; // 记录上一次请求ID
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let activeRequestId = null; // 记录当前活动请求ID
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/**
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* 终止的请求
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*/
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const stopAbortTask = () => {
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console.log("🛑 开始强制终止请求... ");
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isAborted = true;
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// 将当前活动请求ID保存为上一次请求ID
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lastRequestId = activeRequestId;
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// 清除当前活动请求ID
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activeRequestId = null;
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if (currentPromiseReject) {
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currentPromiseReject(new Error('请求已被用户终止'));
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currentPromiseReject = null;
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}
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if (requestTask) {
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// 先移除监听器，再终止请求
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const cleanupListeners = () => {
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try {
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if(requestTask.offChunkReceived) {
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console.log("======>offChunkReceived")
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requestTask.offChunkReceived();
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}
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if(requestTask.offHeadersReceived) {
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console.log("======>offHeadersReceived")
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requestTask.offHeadersReceived();
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}
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} catch (e) {
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console.error('清理事件监听器失败:', e);
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}
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};
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cleanupListeners();
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// 终止请求
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try {
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if (requestTask.abort) {
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console.log("======>abort")
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requestTask.abort();
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}
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} catch (e) {
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console.log('🛑 终止网络请求失败:', e);
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}
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requestTask = null;
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}
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console.log('🛑 请求强制终止完成');
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}
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const agentChatStream = (params, onChunk) => {
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return new Promise((resolve, reject) => {
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const token = uni.getStorageSync('token');
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const requestId = Date.now().toString(); // 生成唯一请求ID
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// 重置状态
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isAborted = false;
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currentPromiseReject = reject;
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// 更新请求ID追踪
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lastRequestId = activeRequestId; // 保存上一次请求ID
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activeRequestId = requestId; // 设置新的活动请求ID
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console.log(`🚀 发送请求 [${requestId}], 上一次请求ID [${lastRequestId}]`);
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// 检查数据块是否来自已终止的请求
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const isStaleData = (dataRequestId) => {
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return dataRequestId === lastRequestId || dataRequestId !== activeRequestId;
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};
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// #ifdef MP-WEIXIN
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requestTask = uni.request({
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url: BASE_URL + API, // 替换为你的接口地址
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method: 'POST',
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data: params,
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enableChunked: true,
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header: {
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Accept: 'text/event-stream',
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'Content-Type': 'application/json',
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Authorization: `Bearer ${token}`, // 如需token可加
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},
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responseType: 'arraybuffer',
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success(res) {
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if (!isAborted && !isStaleData(requestId)) {
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console.log(`✅ 请求 [${requestId}] 成功`);
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resolve(res.data);
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} else {
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console.log(`❌ 请求 [${requestId}] 已终止或过期，忽略success回调`);
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}
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},
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fail(err) {
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if (!isAborted && activeRequestId === requestId) {
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console.log(`❌ 请求 [${requestId}] 失败:`, JSON.stringify(err));
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reject(err);
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} else {
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console.log(`❌ 请求 [${requestId}] 已终止或过期，忽略fail回调`);
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}
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},
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complete(res) {
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// 使用 requestId 来验证请求有效性
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if (!isAborted && activeRequestId === requestId) {
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if (res.statusCode !== 200) {
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console.log(`❌ 请求 [${requestId}] 完成但状态错误，状态:`, res.statusCode);
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if(res.statusCode === 424) {
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uni.setStorageSync('token', '');
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goLogin();
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}
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if (onChunk) {
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onChunk({
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error: true,
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message: '服务器错误',
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detail: res
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});
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}
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reject(res);
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}
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} else {
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console.log(`❌ 请求 [${requestId}] ${isAborted ? '已终止' : '已过期'}，忽略complete回调`);
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}
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}
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});
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requestTask.onHeadersReceived(res => {
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// 使用 requestId 验证请求有效性
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if (isAborted || activeRequestId !== requestId) {
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console.log(`🚫 Headers [${requestId}] ${isAborted ? '已终止' : '已过期'}，忽略`);
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return;
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}
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console.log(`📡 请求 [${requestId}] Headers接收:`, res);
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const status = res.statusCode || (res.header && res.header.statusCode);
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if (status && status !== 200) {
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console.log(`❌ 请求 [${requestId}] 服务器返回错误状态:`, status);
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if (onChunk && !isAborted && activeRequestId === requestId) {
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onChunk({
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error: true,
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message: `服务器错误(${status})`,
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detail: res
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});
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}
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// 终止异常请求
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if (requestTask && requestTask.abort) {
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requestTask.abort();
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}
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}
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});
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requestTask.onChunkReceived(res => {
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// 立即验证请求有效性
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if (isAborted || isStaleData(requestId)) {
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console.log(`🚫 数据块 [${requestId}] 已终止或过期，忽略`);
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return;
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}
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const base64 = uni.arrayBufferToBase64(res.data);
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let data = '';
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try {
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data = decodeURIComponent(escape(weAtob(base64)));
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} catch (e) {
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console.error('Base64解码失败:', e);
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return;
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}
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console.log("📦 onChunkReceived，res:", data)
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// 再次验证请求有效性
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if (isAborted || activeRequestId !== requestId) {
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console.log(`🚫 解析后数据 [${requestId}] 已终止或过期，忽略`);
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return;
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}
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const messages = parseSSEChunk(data);
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messages.forEach(msg => {
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if (!isAborted && !isStaleData(requestId) && onChunk) {
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onChunk(msg);
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}
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});
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});
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// #endif
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});
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}
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// window.atob兼容性处理
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const weAtob = (string) => {
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const b64re = /^(?:[A-Za-z\d+/]{4})*?(?:[A-Za-z\d+/]{2}(?:==)?|[A-Za-z\d+/]{3}=?)?$/;
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const b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
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// 去除空白字符
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string = String(string).replace(/[\t\n\f\r ]+/g, '');
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// 验证 Base64 编码
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if (!b64re.test(string)) {
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throw new TypeError(
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// eslint-disable-next-line quotes
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"Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded."
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);
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}
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// 填充字符
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string += '=='.slice(2 - (string.length & 3));
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let bitmap,
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result = '',
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r1,
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r2,
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i = 0;
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for (; i < string.length;) {
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bitmap =
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(b64.indexOf(string.charAt(i++)) << 18) |
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(b64.indexOf(string.charAt(i++)) << 12) |
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((r1 = b64.indexOf(string.charAt(i++))) << 6) |
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(r2 = b64.indexOf(string.charAt(i++)));
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if (r1 === 64) {
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result += String.fromCharCode((bitmap >> 16) & 255);
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} else if (r2 === 64) {
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result += String.fromCharCode(
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(bitmap >> 16) & 255,
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(bitmap >> 8) & 255
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);
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} else {
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result += String.fromCharCode(
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(bitmap >> 16) & 255,
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(bitmap >> 8) & 255,
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bitmap & 255
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);
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}
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}
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return result;
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};
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// 解析SSE分段数据
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const parseSSEChunk = (raw) => {
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const results = [];
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// 按一个或多个连续换行分段，表示每一个事件块
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const chunks = raw.split(/\n\n+/);
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for (const chunk of chunks) {
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const lines = chunk.split(/\r?\n/);
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let dataLines = [];
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for (const line of lines) {
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if (line.startsWith('data:')) {
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// 提取data:后面的内容并去除首尾空格
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dataLines.push(line.slice(5).trim());
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}
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}
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if (dataLines.length > 0) {
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// 拼接多行数据
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const fullData = dataLines.join('\n');
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try {
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const obj = JSON.parse(fullData);
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results.push(obj);
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} catch (e) {
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console.warn('⚠️ SSE数据解析失败:', e, '原始数据:', fullData);
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// 解析失败忽略
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}
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}
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}
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return results;
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}
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export { agentChatStream, stopAbortTask }
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