app.py

import gradio as gr
import numpy as np
import io
from pydub import AudioSegment
import tempfile
import os
import base64
import openai
import time
from dataclasses import dataclass, field
from threading import Lock

@dataclass
class AppState:
    conversation: list = field(default_factory=list)
    client: openai.OpenAI = None

# Global lock for thread safety
state_lock = Lock()

def create_client(api_key):
    return openai.OpenAI(
        base_url="https://llama3-1-8b.lepton.run/api/v1/",
        api_key=api_key
    )

def process_audio_file(audio_file, state):
    if state.client is None:
        raise gr.Error("Please enter a valid API key first.")

    format_ = "opus"
    bitrate = 16

    with open(audio_file.name, "rb") as f:
        audio_bytes = f.read()
    audio_data = base64.b64encode(audio_bytes).decode()

    try:
        stream = state.client.chat.completions.create(
            extra_body={
                "require_audio": True,
                "tts_preset_id": "jessica",
                "tts_audio_format": format_,
                "tts_audio_bitrate": bitrate
            },
            model="llama3.1-8b",
            messages=[{"role": "user", "content": [{"type": "audio", "data": audio_data}]}],
            temperature=0.5,
            max_tokens=128,
            stream=True,
        )

        transcript = ""
        audio_chunks = []

        for chunk in stream:
            if chunk.choices[0].delta.content:
                transcript += chunk.choices[0].delta.content
            if hasattr(chunk.choices[0], 'audio') and chunk.choices[0].audio:
                audio_chunks.extend(chunk.choices[0].audio)

        audio_data = b''.join([base64.b64decode(a) for a in audio_chunks])
        
        return transcript, audio_data, state

    except Exception as e:
        raise gr.Error(f"Error processing audio: {str(e)}")

def generate_response_and_audio(message, state):
    if state.client is None:
        raise gr.Error("Please enter a valid API key first.")

    with state_lock:
        state.conversation.append({"role": "user", "content": message})
        
        try:
            completion = state.client.chat.completions.create(
                model="llama3-1-8b",
                messages=state.conversation,
                max_tokens=128,
                stream=True,
                extra_body={
                    "require_audio": "true",
                    "tts_preset_id": "jessica",
                }
            )

            full_response = ""
            audio_chunks = []

            for chunk in completion:
                if not chunk.choices:
                    continue
                
                content = chunk.choices[0].delta.content
                audio = getattr(chunk.choices[0], 'audio', [])
                
                if content:
                    full_response += content
                    yield full_response, None, state
                
                if audio:
                    audio_chunks.extend(audio)
                    audio_data = b''.join([base64.b64decode(a) for a in audio_chunks])
                    yield full_response, audio_data, state

            state.conversation.append({"role": "assistant", "content": full_response})
        except Exception as e:
            raise gr.Error(f"Error generating response: {str(e)}")

def chat(message, state):
    if not message:
        return "", None, state

    return generate_response_and_audio(message, state)

def set_api_key(api_key, state):
    if not api_key:
        raise gr.Error("Please enter a valid API key.")
    state.client = create_client(api_key)
    return "API key set successfully!", state

with gr.Blocks() as demo:
    state = gr.State(AppState())
    
    with gr.Row():
        api_key_input = gr.Textbox(type="password", label="Enter your Lepton API Key")
        set_key_button = gr.Button("Set API Key")
    
    api_key_status = gr.Textbox(label="API Key Status", interactive=False)
    
    with gr.Row():
        with gr.Column(scale=1):
            audio_file_input = gr.File(label="Upload Audio File")
        with gr.Column(scale=2):
            chatbot = gr.Chatbot()
            text_input = gr.Textbox(show_label=False, placeholder="Type your message here...")
        with gr.Column(scale=1):
            audio_output = gr.Audio(label="Generated Audio")
    
    set_key_button.click(set_api_key, inputs=[api_key_input, state], outputs=[api_key_status, state])
    audio_file_input.change(
        process_audio_file,
        inputs=[audio_file_input, state],
        outputs=[text_input, audio_output, state]
    )
    text_input.submit(chat, inputs=[text_input, state], outputs=[chatbot, audio_output, state])
    
demo.launch()