pluto/handler/app.py

#!/usr/sbin/env python3
# Twisted/Klein imports
from twisted.logger import Logger
from twisted.internet import reactor
from twisted.internet.task import LoopingCall, deferLater
from klein import Klein

# Other library imports
from json import dumps, loads
from json.decoder import JSONDecodeError

# Project imports
from settings import settings
from revolut import Revolut
from transactions import Transactions


def convert(data):
    if isinstance(data, bytes):
        return data.decode("ascii")
    if isinstance(data, dict):
        return dict(map(convert, data.items()))
    if isinstance(data, tuple):
        return map(convert, data)
    return data


class WebApp(object):
    """
    Our Klein webapp.
    """

    app = Klein()

    def __init__(self):
        self.revolut = Revolut()
        self.tx = Transactions()
        self.log = Logger("webapp")

    @app.route("/callback", methods=["POST"])
    def callback(self, request):
        content = request.content.read()
        try:
            parsed = loads(content)
        except JSONDecodeError:
            self.log.error("Failed to parse JSON callback: {content}", content=content)
            return dumps({"success": False})
        self.log.info("Callback received: {parsed}", parsed=parsed["data"]["id"])
        self.tx.transaction(parsed)
        return dumps({"success": True})

    @app.route("/find/<string:reference>/<string:amount>")
    def find(self, request, reference, amount):
        try:
            int(amount)
        except ValueError:
            return dumps({"success": False, "msg": "Amount is not an integer"})
        rtrn = self.tx.find_tx(reference, amount)
        if rtrn == "AMOUNT_INVALID":
            return dumps({"success": False, "msg": "Reference found but amount invalid"})
        elif not rtrn:
            return dumps({"success": False, "msg": "Reference not found"})
        else:
            return dumps(convert(rtrn))


def start(handler):
    """
    Schedule to refresh the API token once the reactor starts, and create LoopingCapp to refresh it periodically.
    """
    deferLater(reactor, 1, handler.get_new_token)
    deferLater(reactor, 4, handler.setup_webhook)
    lc = LoopingCall(handler.get_new_token)
    lc.start(settings.token_refresh_sec)


if __name__ == "__main__":
    webapp = WebApp()
    start(webapp.revolut)
    webapp.app.run("127.0.0.1", 8080)