firebase cloudfunctions上のpython関数をローカルでテストする

おそらくgcloudのツールとかを使ってローカルに仮想環境作ったりするのが順当な手順なんだと思うが、めんどくさかったのでflaskの test_request_context()を使った。

以下がcloudfunctionsのhello_world関数

def hello_world(request):
    """Responds to any HTTP request.
    Args:
        request (flask.Request): HTTP request object.
    Returns:
        The response text or any set of values that can be turned into a
        Response object using
        `make_response <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
    """
    request_json = request.get_json()
    if request.args and 'message' in request.args:
        return request.args.get('message')
    elif request_json and 'message' in request_json:
        return request_json['message']
    else:
        return f'Hello World!'

これを動かすにはこのようにすれば良い

import flask

app = flask.Flask(__name__)

@app.route('/test/')
def hello_world(request):
    """Responds to any HTTP request.
    Args:
        request (flask.Request): HTTP request object.
    Returns:
        The response text or any set of values that can be turned into a
        Response object using
        `make_response <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
    """
    request_json = request.get_json()
    if request.args and 'message' in request.args:
        return request.args.get('message')
    elif request_json and 'message' in request_json:
        return request_json['message']
    else:
        return f'Hello World!'

if __name__ == '__main__':
    with app.test_request_context('/test/'):
        response = hello_world(flask.request)
        print(f'{response}')
    with app.test_request_context('/test?message=hello_hello_how_low?'):
        response = hello_world(flask.request)
        print(f'{response}')