Spaces:
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Sleeping
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import { useState, useRef } from 'react';
export interface ChatRequest {
messages: ChatHistory[];
metadata?: ChatMetadata;
temperature: number;
max_tokens?: number;
stream: boolean;
}
interface ChatMetadata {
role_id?: string;
enable_l0_retrieval: boolean;
enable_l1_retrieval: boolean;
}
interface ChatHistory {
role: 'user' | 'assistant' | 'system';
content: string;
}
export const useSSE = () => {
const [streaming, setStreaming] = useState(false);
const [error, setError] = useState<string | null>(null);
const [streamContent, setStreamContent] = useState('');
const [streamRawContent, setStreamRawContent] = useState('');
const [firstContentLoading, setFirstContentLoading] = useState(false);
const abortControllerRef = useRef<AbortController | null>(null);
const streamContentRef = useRef('');
const streamRawContentRef = useRef('');
const stopSSE = () => {
if (abortControllerRef.current) {
abortControllerRef.current.abort();
}
setStreaming(false);
};
const sendStreamMessage = async (request: ChatRequest) => {
setStreaming(true);
setError(null);
setStreamContent('');
setStreamRawContent('');
setFirstContentLoading(true);
streamContentRef.current = ''; // Clear this as well
streamRawContentRef.current = ''; // Clear this as well
// Use AbortController to cancel the request
const controller = new AbortController();
abortControllerRef.current = controller; // Store the controller in the ref
const signal = controller.signal;
try {
const response = await fetch('/api/kernel2/chat', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
Accept: 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive'
},
body: JSON.stringify(request),
signal
});
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const reader = response.body?.getReader();
if (!reader) {
throw new Error('ReadableStream not supported');
}
const decoder = new TextDecoder();
let interval: NodeJS.Timeout | null = null;
const featchStream = async () => {
try {
const { done, value } = await reader.read();
if (done) {
if (interval) clearInterval(interval);
setStreaming(false);
return;
}
const chunk = decoder.decode(value);
const lines = chunk.split('\n');
for (const line of lines) {
streamRawContentRef.current += line + '\n';
setStreamRawContent(streamRawContentRef.current);
if (!line.startsWith('data: ')) continue;
if (line === 'data: [DONE]') break;
const jsonChunk = line.slice(6).trim();
if (!jsonChunk) continue;
const parsedData = JSON.parse(jsonChunk);
const content = parsedData?.choices[0].delta.content || '';
// Use useRef to record the latest streamContent
setFirstContentLoading(false);
streamContentRef.current += content;
setStreamContent(streamContentRef.current);
}
} catch {
setStreaming(false);
if (interval) clearInterval(interval);
}
};
interval = setInterval(featchStream, 10);
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Unknown error occurred';
setError(errorMessage);
setStreamContent(errorMessage);
console.error('Streaming error:', err);
setStreaming(false);
}
};
return {
stopSSE,
sendStreamMessage,
streaming,
error,
streamContent,
streamRawContent,
firstContentLoading
};
};
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