app.py

import gradio as gr
from fastapi import FastAPI, Request, HTTPException
from fastapi.responses import JSONResponse
import datetime
import requests
import os
import logging

# Initialize FastAPI
app = FastAPI()

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Configuration
API_URL = "https://api-inference.huggingface.co/models/Qwen/Qwen2.5-Coder-32B"
headers = {
    "Authorization": f"Bearer {os.getenv('HF_API_TOKEN')}",
    "Content-Type": "application/json"
}

def format_chat_response(response_text, prompt_tokens=0, completion_tokens=0):
    return {
        "id": f"chatcmpl-{datetime.datetime.now().strftime('%Y%m%d%H%M%S')}",
        "object": "chat.completion",
        "created": int(datetime.datetime.now().timestamp()),
        "model": "Qwen/Qwen2.5-Coder-32B",
        "choices": [{
            "index": 0,
            "message": {
                "role": "assistant",
                "content": response_text
            },
            "finish_reason": "stop"
        }],
        "usage": {
            "prompt_tokens": prompt_tokens,
            "completion_tokens": completion_tokens,
            "total_tokens": prompt_tokens + completion_tokens
        }
    }

async def query_model(payload):
    try:
        response = requests.post(API_URL, headers=headers, json=payload)
        response.raise_for_status()
        return response.json()
    except requests.exceptions.RequestException as e:
        logger.error(f"Request failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/status")
async def status():
    try:
        response_text = "it's working"
        return JSONResponse(content=format_chat_response(response_text))
    except Exception as e:
        logger.error(f"Status check failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/v1/chat/completions")
async def chat_completion(request: Request):
    try:
        data = await request.json()
        messages = data.get("messages", [])
        if not messages:
            raise HTTPException(status_code=400, detail="Messages are required")

        payload = {
            "inputs": {
                "messages": messages
            },
            "parameters": {
                "max_new_tokens": data.get("max_tokens", 2048),
                "temperature": data.get("temperature", 0.7),
                "top_p": data.get("top_p", 0.95),
                "do_sample": True
            }
        }
        
        response = await query_model(payload)
        
        if isinstance(response, dict) and "error" in response:
            raise HTTPException(status_code=500, detail=response["error"])
        
        response_text = response[0]["generated_text"]
        
        return JSONResponse(content=format_chat_response(response_text))
    except HTTPException as e:
        logger.error(f"Chat completion failed: {e.detail}")
        raise e
    except Exception as e:
        logger.error(f"Unexpected error: {e}")
        raise HTTPException(status_code=500, detail=str(e))

def generate_response(messages):
    payload = {
        "inputs": {
            "messages": messages
        },
        "parameters": {
            "max_new_tokens": 2048,
            "temperature": 0.7,
            "top_p": 0.95,
            "do_sample": True
        }
    }
    
    try:
        response = requests.post(API_URL, headers=headers, json=payload)
        response.raise_for_status()
        result = response.json()
        
        if isinstance(result, dict) and "error" in result:
            return f"Error: {result['error']}"
        
        return result[0]["generated_text"]
    except requests.exceptions.RequestException as e:
        logger.error(f"Request failed: {e}")
        return f"Error: {e}"

def chat_interface(messages):
    chat_history = []
    for message in messages:
        try:
            response = generate_response([{"role": "user", "content": message}])
            chat_history.append({"role": "user", "content": message})
            chat_history.append({"role": "assistant", "content": response})
        except Exception as e:
            chat_history.append({"role": "user", "content": message})
            chat_history.append({"role": "assistant", "content": f"Error: {str(e)}"})
    return chat_history

# Create Gradio interface
def gradio_app():
    return gr.ChatInterface(chat_interface, type="messages")

# Mount both FastAPI and Gradio
app = gr.mount_gradio_app(app, gradio_app(), path="/")

# For running with uvicorn directly
if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)