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# Copyright 2021 Google LLC

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import datetime

import signal

import sys

from types import FrameType

from flask import Flask, render_template, request, Response

import database

import middleware

from middleware import jwt_authenticated, logger

app = Flask(__name__, static_folder="static", static_url_path="")

@app.before_first_request

def create_table() -> None:

database.create_tables()

@app.route("/", methods=["GET"])

def index() -> str:

context = database.get_index_context()

cats_count = context["cats_count"]

dogs_count = context["dogs_count"]

lead_team = ""

vote_diff = 0

leader_message = ""

if cats_count != dogs_count:

if cats_count > dogs_count:

lead_team = "CATS"

vote_diff = cats_count - dogs_count

else:

lead_team = "DOGS"

vote_diff = dogs_count - cats_count

leader_message = (

f"{lead_team} are winning by {vote_diff} vote{'s' if vote_diff > 1 else ''}"

)

else:

leader_message = "CATS and DOGS are evenly matched!"

context["leader_message"] = leader_message

context["lead_team"] = lead_team

return render_template("index.html", **context)

@app.route("/", methods=["POST"])

@jwt_authenticated

def save_vote() -> Response:

# Get the team and time the vote was cast.

team = request.form["team"]

uid = request.uid

time_cast = datetime.datetime.utcnow()

# Verify that the team is one of the allowed options

if team != "CATS" and team != "DOGS":

logger.warning(f"Invalid team: {team}")

return Response(response="Invalid team specified.", status=400)

try:

database.save_vote(team=team, uid=uid, time_cast=time_cast)

except Exception as e:

# If something goes wrong, handle the error in this section. This might

# involve retrying or adjusting parameters depending on the situation.

logger.exception(e)

return Response(

status=500,

response="Unable to successfully cast vote! Please check the "

"application logs for more details.",

)

return Response(

status=200,

response="Vote successfully cast for '{}' at time {}!".format(team, time_cast),

)

# https://cloud.google.com/blog/topics/developers-practitioners/graceful-shutdowns-cloud-run-deep-dive

# [START cloudrun_sigterm_handler]

def shutdown_handler(signal: int, frame: FrameType) -> None:

logger.info("Signal received, safely shutting down.")

database.shutdown()

middleware.logging_flush()

print("Exiting process.", flush=True)

sys.exit(0)

# [END cloudrun_sigterm_handler]

if __name__ == "__main__":

# handles Ctrl-C locally

signal.signal(signal.SIGINT, shutdown_handler)

app.run(host="127.0.0.1", port=8080, debug=True)

else:

# handles Cloud Run container termination

# [START cloudrun_sigterm_handler]

signal.signal(signal.SIGTERM, shutdown_handler)

# [END cloudrun_sigterm_handler]