A flask server used to inject javascript into a window to test using PhantomJS

basic_flask_server.py

import threading
from yattag import Doc
from flask import Flask
js_scripts = []
app = (Flask(__name__))
thread = None

def start(host='0.0.0.0', port = 6969):
    """Gets app listening on host:port. Call inject before starting the

    Args:
        host (str):
        port (int):

    Returns:
        None
    """
    global thread
    thread = threading.Thread(target=app.run,
                     kwargs={'host':host,
                             'port':port})
    thread.start()


def inject(js_script):
    """Add js_scripts to render.

    Args:
        js_script (str):The JS content you would like to inject (will wrap in <script> tag)

    Returns:
        None
    """
    global js_scripts
    js_scripts.append(js_script)
    print(js_scripts)

@app.route('/')
def home():
    doc, tag, text = Doc().tagtext()
    with tag('html'):
        with tag('body'):
            for script in js_scripts:
                print(script)
                with tag('script'):
                    text(script)
    print(doc.getvalue())
    return doc.getvalue()


if __name__ == '__main__':
    start()
    inject("alert('1x1 let me see ya\\n2x2 for the sequel\\n3x3 for my people')")