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* useStreamingReport Hook
*
* 处理 AI 报告的流式生成
* 支持实时显示、取消请求、错误处理
*/
import { useCallback, useRef, useState } from 'react';
import { API_BASE_URL } from '@/src/config/env';
import { useUserStore } from '@/src/store/userStore';
import { logger } from '@/src/utils/logger';
// ==================== 类型定义 ====================
/** 流式状态 */
export interface StreamingState {
/** 当前流式内容 */
content: string;
/** 是否正在流式传输 */
isStreaming: boolean;
/** 是否已完成 */
isComplete: boolean;
/** 错误信息 */
error: string | null;
/** 进度估算 (0-100) */
progress: number;
}
/** Hook 返回值 */
export interface UseStreamingReportReturn {
/** 流式状态 */
state: StreamingState;
/** 开始流式生成 */
startStreaming: (catfoodId: number, ingredients: string) => Promise<void>;
/** 停止流式传输 */
stopStreaming: () => void;
/** 重置状态 */
reset: () => void;
}
// ==================== 常量 ====================
const INITIAL_STATE: StreamingState = {
content: '',
isStreaming: false,
isComplete: false,
error: null,
progress: 0,
};
// 估计的总字符数（用于进度计算）
const ESTIMATED_TOTAL_CHARS = 1500;
// ==================== Hook 实现 ====================
export function useStreamingReport(): UseStreamingReportReturn {
const [state, setState] = useState<StreamingState>(INITIAL_STATE);
const abortControllerRef = useRef<AbortController | null>(null);
const contentRef = useRef<string>('');
/**
* 开始流式生成
*/
const startStreaming = useCallback(async (catfoodId: number, ingredients: string) => {
// 重置状态
contentRef.current = '';
setState({
content: '',
isStreaming: true,
isComplete: false,
error: null,
progress: 0,
});
// 创建 AbortController
abortControllerRef.current = new AbortController();
try {
// 获取 token
const token = useUserStore.getState().accessToken;
if (!token) {
throw new Error('未登录');
}
logger.info('开始流式生成 AI 报告', { catfoodId });
// 发起流式请求
const response = await fetch(`${API_BASE_URL}/api/ai/${catfoodId}/stream/`, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${token}`,
},
body: JSON.stringify({ ingredients }),
signal: abortControllerRef.current.signal,
});
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
// 获取 ReadableStream
const reader = response.body?.getReader();
Iif (!reader) {
throw new Error('无法获取响应流');
}
const decoder = new TextDecoder();
// 读取流
while (true) {
const { done, value } = await reader.read();
if (done) {
// 流正常结束
setState((prev) => ({
...prev,
isStreaming: false,
isComplete: true,
progress: 100,
}));
logger.info('流式生成完成', { catfoodId });
break;
}
// 解码数据
const chunk = decoder.decode(value, { stream: true });
// 解析 SSE 格式
const lines = chunk.split('\n');
for (const line of lines) {
if (line.startsWith('data: ')) {
const data = line.slice(6); // 去掉 "data: " 前缀
if (data === '[DONE]') {
// 流结束标记
setState((prev) => ({
...prev,
isStreaming: false,
isComplete: true,
progress: 100,
}));
return;
}
try {
const parsed = JSON.parse(data);
if (parsed.content) {
// 追加内容
contentRef.current += parsed.content;
// 计算进度
const progress = Math.min(
(contentRef.current.length / ESTIMATED_TOTAL_CHARS) * 100,
95
);
setState((prev) => ({
...prev,
content: contentRef.current,
progress,
}));
}
if (parsed.error) {
// If we throw here, it is caught by the inner catch (parseError)
// We need to rethrow or handle it.
// But wait, the inner catch is for JSON.parse errors or logic errors inside try block.
// If we throw here, it goes to catch (parseError).
throw new Error(parsed.error);
}
} catch (parseError) {
// If it was our thrown error, we should probably rethrow it to the outer catch?
// Or handle it here.
// The current code swallows it if it's an Error object, unless we check.
if (
parseError instanceof Error &&
parseError.message &&
!parseError.message.includes('JSON')
) {
// It might be the error we threw above.
// But wait, if JSON.parse fails, it throws SyntaxError.
// If we throw Error(parsed.error), it is an Error.
// The issue is that the catch block below:
// if (data && data !== '[DONE]' && !data.startsWith('{'))
// This logic is for when JSON.parse fails (non-JSON data).
// If we throw an error inside the try block, it is caught here.
// And then ignored because of the if condition (data starts with '{' for json).
// So the error is swallowed.
// We should rethrow if it is a "real" error we want to propagate.
throw parseError;
}
// 忽略非 JSON 数据
Iif (data && data !== '[DONE]' && !data.startsWith('{')) {
contentRef.current += data;
setState((prev) => ({
...prev,
content: contentRef.current,
}));
}
}
}
}
}
} catch (error) {
Eif (error instanceof Error) {
Iif (error.name === 'AbortError') {
// 用户主动取消
logger.info('用户取消流式生成');
setState((prev) => ({
...prev,
isStreaming: false,
error: null,
}));
} else {
// 其他错误
logger.error('流式生成失败', error);
setState((prev) => ({
...prev,
isStreaming: false,
error: error.message || '生成报告失败',
}));
}
}
}
}, []);
/**
* 停止流式传输
*/
const stopStreaming = useCallback(() => {
abortControllerRef.current?.abort();
setState((prev) => ({
...prev,
isStreaming: false,
}));
}, []);
/**
* 重置状态
*/
const reset = useCallback(() => {
abortControllerRef.current?.abort();
contentRef.current = '';
setState(INITIAL_STATE);
}, []);
return {
state,
startStreaming,
stopStreaming,
reset,
};
}
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