Configure Heroku

Procfile

+web: gunicorn app:server --timeout 300

app.py

 """Interactive OpenDataFrance dashboard."""
+import os
+from random import randint
+
 import dash
 import dash_core_components as dcc
 import dash_html_components as html
+import flask
 from dash.dependencies import Input, Output
 
 import app_data
@@ -50,7 +54,9 @@ def compute_bar_figure(reg_code=None, dep_code=None):
     }
 
 
-app = dash.Dash(__name__)
+server = flask.Flask(__name__)
+server.secret_key = os.environ.get("secret_key", str(randint(0, 1000000)))
+app = dash.Dash(__name__, server=server)
 app.layout = html.Div(
     children=[
         html.H1(children="Observatoire opendata des territoires"),

requirements.in

 dash
+gunicorn
 pandas

requirements.txt

@@ -13,6 +13,7 @@ dash_renderer==1.2.2      # via dash
 flask-compress==1.4.0     # via dash
 flask==1.1.1              # via dash, flask-compress
 future==0.18.2            # via dash
+gunicorn==20.0.4
 itsdangerous==1.1.0       # via flask
 jinja2==2.10.3            # via flask
 markupsafe==1.1.1         # via jinja2
@@ -24,3 +25,6 @@ pytz==2019.3              # via pandas
 retrying==1.3.3           # via plotly
 six==1.13.0               # via plotly, python-dateutil, retrying
 werkzeug==0.16.0          # via flask
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools

runtime.txt

+python-3.8.1