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from fastapi import FastAPI, Form, Request |
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from fastapi.responses import HTMLResponse, StreamingResponse |
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import os |
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import json |
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import requests |
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import random |
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app = FastAPI() |
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MODEL = "gpt-4o-mini" |
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API_URL = os.getenv("API_URL", "https://api.openai.com/v1/chat/completions") |
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DISABLED = os.getenv("DISABLED") == 'True' |
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OPENAI_API_KEYS = os.getenv("OPENAI_API_KEYS", "").split(",") |
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NUM_THREADS = int(os.getenv("NUM_THREADS", 1)) |
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HTML_CONTENT = """ |
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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="UTF-8"> |
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<meta name="viewport" content="width=device-width, initial-scale=1.0"> |
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<title>GPT-4o Mini Chat</title> |
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<style> |
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body { font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 20px; } |
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.container { max-width: 800px; margin: auto; background: white; padding: 20px; border-radius: 8px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } |
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h1 { color: #333; text-align: center; } |
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.chatbox { height: 400px; overflow-y: auto; border: 1px solid #ccc; padding: 10px; margin-bottom: 20px; } |
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.message { margin: 10px 0; padding: 8px; border-radius: 5px; } |
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.user { background: #e6f3ff; } |
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.assistant { background: #f0f0f0; } |
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form { display: flex; flex-direction: column; gap: 10px; } |
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input, select, button { padding: 8px; font-size: 16px; } |
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button { background-color: #007bff; color: white; border: none; border-radius: 5px; cursor: pointer; } |
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button:hover { background-color: #0056b3; } |
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button:disabled { background-color: #ccc; cursor: not-allowed; } |
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</style> |
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</head> |
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<body> |
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<div class="container"> |
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<h1>GPT-4o Mini: Research Preview</h1> |
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<div id="chatbox" class="chatbox"></div> |
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<form id="chat-form" action="/chat" method="post"> |
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<input type="text" id="input" name="input" placeholder="Type your message..." required> |
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<select name="top_p"> |
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<option value="1.0">Top P: 1.0</option> |
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<option value="0.9">Top P: 0.9</option> |
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<option value="0.8">Top P: 0.8</option> |
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</select> |
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<select name="temperature"> |
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<option value="1.0">Temperature: 1.0</option> |
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<option value="0.7">Temperature: 0.7</option> |
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<option value="0.3">Temperature: 0.3</option> |
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</select> |
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<button type="submit" id="submit-btn">Send</button> |
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</form> |
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</div> |
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<script> |
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const chatbox = document.getElementById("chatbox"); |
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const form = document.getElementById("chat-form"); |
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const input = document.getElementById("input"); |
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const submitBtn = document.getElementById("submit-btn"); |
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let history = JSON.parse(localStorage.getItem("chatHistory")) || []; |
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history.forEach(msg => addMessage(msg.role, msg.content)); |
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form.addEventListener("submit", async (e) => { |
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e.preventDefault(); |
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const userInput = input.value; |
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const topP = form.top_p.value; |
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const temperature = form.temperature.value; |
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addMessage("user", userInput); |
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input.value = ""; |
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submitBtn.disabled = true; |
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const response = await fetch("/chat", { |
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method: "POST", |
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headers: { "Content-Type": "application/x-www-form-urlencoded" }, |
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body: `input=${encodeURIComponent(userInput)}&top_p=${topP}&temperature=${temperature}` |
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}); |
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const reader = response.body.getReader(); |
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let assistantMessage = ""; |
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const decoder = new TextDecoder(); |
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while (true) { |
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const { done, value } = await reader.read(); |
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if (done) break; |
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assistantMessage += decoder.decode(value); |
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updateLastMessage("assistant", assistantMessage); |
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} |
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history.push({ role: "user", content: userInput }, { role: "assistant", content: assistantMessage }); |
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localStorage.setItem("chatHistory", JSON.stringify(history)); |
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submitBtn.disabled = false; |
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}); |
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function addMessage(role, content) { |
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const div = document.createElement("div"); |
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div.className = `message ${role}`; |
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div.textContent = content; |
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chatbox.appendChild(div); |
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chatbox.scrollTop = chatbox.scrollHeight; |
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} |
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function updateLastMessage(role, content) { |
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const lastMsg = chatbox.lastElementChild; |
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if (lastMsg && lastMsg.className.includes(role)) { |
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lastMsg.textContent = content; |
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} else { |
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addMessage(role, content); |
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} |
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chatbox.scrollTop = chatbox.scrollHeight; |
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} |
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</script> |
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</body> |
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</html> |
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""" |
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@app.get("/", response_class=HTMLResponse) |
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async def home(): |
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if DISABLED: |
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return "<h1 style='color:red;text-align:center'>This app has reached OpenAI's usage limit. Please check back tomorrow.</h1>" |
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return HTML_CONTENT |
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@app.post("/chat") |
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async def chat(input: str = Form(...), top_p: float = Form(1.0), temperature: float = Form(1.0)): |
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if DISABLED: |
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return StreamingResponse(iter(["Usage limit reached."]), media_type="text/plain") |
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if not API_URL: |
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return StreamingResponse(iter(["Error: API_URL is not set in the environment."]), media_type="text/plain") |
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if not OPENAI_API_KEYS or OPENAI_API_KEYS == [""]: |
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return StreamingResponse(iter(["Error: No valid OPENAI_API_KEYS provided."]), media_type="text/plain") |
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payload = { |
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"model": MODEL, |
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"messages": [{"role": "user", "content": input}], |
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"temperature": temperature, |
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"top_p": top_p, |
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"n": 1, |
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"stream": True, |
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"presence_penalty": 0, |
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"frequency_penalty": 0, |
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} |
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OPENAI_API_KEY = random.choice(OPENAI_API_KEYS) |
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headers = { |
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"Content-Type": "application/json", |
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"Authorization": f"Bearer {OPENAI_API_KEY}", |
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} |
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def stream_response(): |
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try: |
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response = requests.post(API_URL, headers=headers, json=payload, stream=True) |
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response.raise_for_status() |
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for chunk in response.iter_lines(): |
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if chunk: |
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chunk_data = chunk.decode('utf-8') |
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if chunk_data.startswith("data: "): |
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chunk_json = json.loads(chunk_data[6:]) |
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if "choices" in chunk_json and "delta" in chunk_json["choices"][0] and "content" in chunk_json["choices"][0]["delta"]: |
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yield chunk_json["choices"][0]["delta"]["content"] |
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except requests.exceptions.MissingSchema: |
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yield "Error: Invalid API_URL. Please provide a valid URL (e.g., https://api.openai.com/v1/chat/completions)." |
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except Exception as e: |
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yield f"Error: {str(e)}" |
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return StreamingResponse(stream_response(), media_type="text/plain") |
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if __name__ == "__main__": |
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import uvicorn |
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uvicorn.run(app, host="0.0.0.0", port=7860) |
