Application try to etablish connection if failed.

Ref #23
Run even the connection failed
Retry to connect if needed

Ref #22
A Notification appears if backend is not available.

alignak_app/alignak_data.py

@@ -28,6 +28,9 @@
 
 from logging import getLogger
 from alignak_backend_client.client import Backend, BackendException
+import gi
+gi.require_version('Notify', '0.7')
+from gi.repository import Notify  # pylint: disable=wrong-import-position
 
 
 logger = getLogger(__name__)
@@ -51,6 +54,7 @@ def log_to_backend(self, config):
         :param config: parser config who contains settings
         :type config: :class:`~configparser.ConfigParser`
         """
+
         # Credentials
         username = config.get('Backend', 'username')
         password = config.get('Backend', 'password')
@@ -64,15 +68,25 @@ def log_to_backend(self, config):
             connect = self.backend.login(username, password)
             if connect:
                 logger.info('Connection to backend : OK.')
+
             else:
                 logger.warn('Connection to backend failed !')
+                Notify.init('appalignak')
+                Notify.Notification.new(
+                    'Connection to backend failed !',
+                    None,
+                    gi.repository.Gtk.STOCK_DIALOG_ERROR,
+                ).show()
         except BackendException as e:
             logger.error(
-                'Can\'t connect to Backend. ' +
+                'Connection to Backend has failed. ' +
                 str(e) +
                 '\nCheck your [settings.cfg] or your backend status.'
             )
-            sys.exit()
+            sys.exit(
+                'Alignak-app will close :( ...' +
+                '\nCheck your logs.'
+            )
 
     def get_host_state(self):
         """
@@ -88,14 +102,13 @@ def get_host_state(self):
             all_host = self.backend.get_all(
                 self.backend.url_endpoint_root + '/host', params)
         except BackendException as e:
-            logger.error('Can\'t get hosts state \n' + str(e))
+            logger.warn('Alignak-app failed to collect hosts... \n' + str(e))
 
         # Store Data
         if all_host:
             for host in all_host['_items']:
                 self.current_hosts[host['name']] = host['ls_state']
-        else:
-            logger.error('AlignakApp has collected 0 hosts !')
+
         return self.current_hosts
 
     def get_service_state(self):
@@ -112,12 +125,11 @@ def get_service_state(self):
             all_services = self.backend.get_all(
                 self.backend.url_endpoint_root + '/service', params)
         except BackendException as e:
-            logger.error('Can\'t get services state \n' + str(e))
+            logger.warn('Alignak-app failed to collect services... \n' + str(e))
 
         # Store Data
         if all_services:
             for service in all_services['_items']:
                 self.current_services[service['name']] = service['ls_state']
-        else:
-            logger.error('AlignakApp has collected 0 services !')
+
         return self.current_services

alignak_app/application.py

@@ -213,6 +213,10 @@ def get_state(self):
         :rtype: dict
         """
 
+        if not self.alignak_data.backend.authenticated:
+            logger.warn('Connection to backend is lost, application will try to reconnect !')
+            self.alignak_data.log_to_backend(self.config)
+
         logger.info('Get state of Host and Services...')
         # Dicts for states
         hosts_states = {
@@ -232,7 +236,6 @@ def get_state(self):
 
         if not hosts_data:
             hosts_states['up'] = -1
-            logger.warning('Alignak-app failed to collect hosts states...')
         else:
             for _, v in hosts_data.items():
                 if 'UP' in v:
@@ -250,7 +253,6 @@ def get_state(self):
         services_data = self.alignak_data.get_service_state()
         if not services_data:
             services_states['ok'] = -1
-            logger.warning('Alignak-app failed to collect services states...')
         else:
             for _, v in services_data.items():
                 if 'OK' in v: