Add periodic status refresh for webview test app

Author: dbnicholson

testapps/on_device_unit_tests/test_app/app_flask.py

@@ -12,6 +12,7 @@
 from flask import (
     Flask,
     current_app,
+    jsonify,
     render_template,
     request,
     Markup
@@ -37,6 +38,11 @@ def __init__(self, *args, **kwargs):
         setup_lifecycle_callbacks()
         self.service_running = False
 
+    def get_status(self):
+        return jsonify({
+            'service_running': self.service_running,
+        })
+
     @property
     @skip_if_not_running_from_android_device
     def service(self):
@@ -88,6 +94,11 @@ def index():
     )
 
 
+@app.route('/status')
+def status():
+    return current_app.get_status()
+
+
 @app.route('/unittests')
 def unittests():
     import unittest

testapps/on_device_unit_tests/test_app/templates/index.html

@@ -134,6 +134,27 @@ <h3 class="text-underline">Android tests</h3>
         </script>
     </div>
 
+    <script>
+      function update_status() {
+          var request = new XMLHttpRequest();
+          request.onload = function() {
+              var service_status = document.getElementById('service-status');
+              if (this.status >= 400) {
+                  service_status.textContent = `App status failed: ${this.statusText}`;
+              } else {
+                  var status = JSON.parse(this.responseText);
+                  service_status.textContent = status.service_running
+                      ? 'Service started'
+                      : 'Service stopped';
+              }
+          };
+          request.open('GET', 'status', true);
+          request.send();
+      }
+
+      setInterval(update_status, 2000);
+    </script>
+
     <br>
     <br>
 </div>