nguyenkims · July 11, 2017 08:56 · Jul 11, 2017
diff --git a/app.py b/app.py
@@ -0,0 +1,70 @@
+"""
+This is an example on how to reload Flask app in runtime
+
+It can be useful for the use case where you want to enable/disable blueprints/routes dynamically.
+
+To run the app:
+
+> pip install flask & python app.py
+
+Then test it via curl
+
+> curl localhost:5000/
+> curl localhost:5000/reload
+> curl localhost:5000/ # should see a different start time as the flask app is replaced
+
+"""
+from datetime import datetime
+
+from flask import Flask
+from werkzeug.serving import run_simple
+
+# set to True to inform that the app needs to be re-created
+to_reload = False
+
+
+def get_app():
+    print("create app now")
+    app = Flask(__name__)
+
+    # to make sure of the new app instance
+    now = datetime.now()
+
+    @app.route("/")
+    def index():
+        return f"hello, the app started at %s" % now
+
+    @app.route('/reload')
+    def reload():
+        global to_reload
+        to_reload = True
+        return "reloaded"
+
+    return app
+
+
+class AppReloader(object):
+    def __init__(self, create_app):
+        self.create_app = create_app
+        self.app = create_app()
+
+    def get_application(self):
+        global to_reload
+        if to_reload:
+            self.app = self.create_app()
+            to_reload = False
+
+        return self.app
+
+    def __call__(self, environ, start_response):
+        app = self.get_application()
+        return app(environ, start_response)
+
+
+# This application object can be used in any WSGI server
+# for example in gunicorn, you can run "gunicorn app"
+application = AppReloader(get_app)
+
+if __name__ == '__main__':
+    run_simple('localhost', 5000, application,
+               use_reloader=True, use_debugger=True, use_evalex=True)
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