from flask import Flask
from flask_redis import Redis

# make sure redis (container) is running and accessible

# see https://flask-and-redis.readthedocs.io/en/latest/
# see https://github.com/andymccurdy/redis-py

app = Flask(__name__)
app.config["REDIS_HOST"] = "localhost"
app.config["REDIS_PORT"] = 6379
redis = Redis(app)


@app.route("/")
def home_page():
    redis.set('tl1', 'sending change red -> green <br>')
    redis.append('tl1', 'sending change green -> red <br>')
    redis.set('v1', 'receiving vel 100 km/h <br>')

    return redis.get('tl1') + redis.get('v1')


if __name__ == '__main__':
    app.run()