Adding gunicorn as a multi-threaded production server

app/templates/panoramix/datasource.html

@@ -102,7 +102,7 @@ form input.form-control {
     <hr/>
     {% block viz %}
         {% if error_msg %}
-            <div class="alert alert-danger">{{ error_msg }}</div>
+            <span class="alert alert-danger">{{ error_msg }}</span>
         {% endif %}
     {% endblock %}
 

config.py

@@ -13,6 +13,7 @@ There' a ``from local_config import *`` at the end of this file.
 # Panoramix specifix config
 #---------------------------------------------------------
 ROW_LIMIT = 5000
+WEBSERVER_THREADS = 8
 
 PANORAMIX_WEBSERVER_PORT = 8088
 #---------------------------------------------------------

requirements.txt

@@ -1,6 +1,7 @@
 flask
 flask-alembic
 flask-appbuilder
+gunicorn
 mysql-python
 pandas
 parsedatetime

run.py

@@ -1,8 +1,19 @@
 from app import app
 import config
+from subprocess import Popen
+
+if config.DEBUG:
+    app.run(
+        host='0.0.0.0',
+        port=int(config.PANORAMIX_WEBSERVER_PORT),
+        debug=True)
+else:
+    cmd = (
+        "gunicorn "
+        "-w 8 "
+        "-b 0.0.0.0:{config.PANORAMIX_WEBSERVER_PORT} "
+        "app:app").format(**locals())
+    print("Starting server with command: " + cmd)
+    Popen(cmd, shell=True).wait()
 
-app.run(
-    host='0.0.0.0',
-    port=int(config.PANORAMIX_WEBSERVER_PORT),
-    debug=config.DEBUG)