How do I pass arguments to after_request?

Question

I am new to Flask and am learning about the @app.after_request and @app.teardown_appcontext. I have a decorated view for oauthlib that takes an argument, data (which is an object).

@app.route('/api/me')
@oauth.require_oauth()
def me(data):
    user = data.user
    return jsonify(username=user.username)

After this view (and many other views) are executed, I'd like to update my database but need to have access to the variable data. How do I do that with @app.after_request or @app.teardown_appcontext?

@app.after_request
def record_ip(response):
   client = data.client # needs access to "data"
   .... log stuff in my database ...
   return response

Answer 1

You can add the object to the flask.g globals object:

from flask import g

@app.route('/api/me')
@oauth.require_oauth()
def me(req):
    user = req.user
    g.oauth_request = req
    return jsonify(username=user.username)

@app.after_request
def record_ip(response):
   req = g.get('oauth_request')
   if req is not None:
       client = req.client # needs access to "req"
       # .... log stuff in my database ...

   return response

The global flask.g context is thread safe and tied to the current request; quoting from the documentation:

The application context is created and destroyed as necessary. It never moves between threads and it will not be shared between requests.