如何在Flask中退出会话到期时创建新的watson助手会话？

from flask import Flask, session, request, jsonify
import requests

app = Flask(__name__)
app.secret_key = 'your_secret_key'

# Watson Assistant配置
watson_assistant_url = 'https://api.us-south.assistant.watson.cloud.ibm.com/v2/assistants/{assistant_id}/sessions'
watson_api_key = 'your_api_key'

@app.route('/chat', methods=['POST'])
def chat():
    if 'session_id' not in session or is_session_expired(session['session_id']):
        session['session_id'] = create_new_watson_session()
    
    # 处理聊天消息
    message = request.json.get('message')
    response = send_message_to_watson(session['session_id'], message)
    
    return jsonify(response)

def is_session_expired(session_id):
    # 这里可以添加会话过期检查逻辑
    return True  # 示例中假设会话总是过期

def create_new_watson_session():
    headers = {
        'Content-Type': 'application/json',
        'Authorization': f'Bearer {watson_api_key}'
    }
    data = {
        'assistant_id': 'your_assistant_id'
    }
    response = requests.post(watson_assistant_url.format(assistant_id='your_assistant_id'), headers=headers, json=data)
    if response.status_code == 201:
        return response.json().get('session_id')
    else:
        raise Exception('Failed to create new Watson session')

def send_message_to_watson(session_id, message):
    headers = {
        'Content-Type': 'application/json',
        'Authorization': f'Bearer {watson_api_key}'
    }
    data = {
        'input': {
            'message_type': 'text',
            'text': message
        },
        'session_id': session_id
    }
    response = requests.post(f'{watson_assistant_url.format(assistant_id='your_assistant_id')}/{session_id}/message', headers=headers, json=data)
    return response.json()

if __name__ == '__main__':
    app.run(debug=True)