Merge pull request #163 from sympy/status-endpoint

Add status endpoint to check if app is running

.travis.yml

@@ -58,6 +58,9 @@ deploy:
 after_deploy:
   - pip install requests
   - python bin/update_status_on_pr.py
+  - status_code=$(curl --write-out %{http_code} --silent --output /dev/null https://$TRAVIS_BRANCH-dot-sympy-live-hrd.appspot.com/status)
+  - echo "App status code => $status_code"
+  - if [ "$status_code" != "200" ]; then travis_terminate; fi
 
 env:
   global:

app/shell.py

@@ -829,12 +829,22 @@ def get(self):
 
         self.response.out.write("Your queries have been deleted.")
 
+
 class RedirectHandler(webapp.RedirectHandler):
     """Redirects deprecated pages to the frontpage."""
 
     def get(self):
         self.redirect('/', permanent=True)
 
+
+class StatusHandler(webapp.RequestHandler):
+    """Status endpoint to check if the app is running or not."""
+
+    def get(self):
+        self.response.headers['Content-Type'] = 'application/json'
+        self.response.out.write(json.dumps({"status": "ok"}))
+
+
 application = webapp.WSGIApplication([
   ('/', FrontPageHandler),
   ('/evaluate', EvaluateHandler),
@@ -845,4 +855,5 @@ def get(self):
   ('/shellmobile', RedirectHandler),
   ('/shelldsi', RedirectHandler),
   ('/helpdsi', RedirectHandler),
+  ('/status', StatusHandler),
 ], debug=_DEBUG)