minor: check_integrity, depends on djangoldp!207

README.md

@@ -110,3 +110,21 @@ python3 manage.py mock_notification --older 10d
 # Default. Will delete notifications older than 10 hours ago
 python3 manage.py mock_notification --older 10h
 ```
+
+## Check your datas integrity
+
+Because of the way the DjangoLDP's federation work, you may want to send your notification to every subscribers sometimes.
+
+Follow the [check_integrity](https://git.startinblox.com/djangoldp-packages/djangoldp#check-your-datas-integrity) command of DjangoLDP to get how much resources will be impacted:
+
+```bash
+./manage.py check_integrity
+```
+
+Then run this command to send notifications:
+
+```bash
+./manage.py check_integrity --send-subscription-notifications
+```
+
+Notice that you may have to restart your ActivityQueue or your DjangoLDP server, depending on [how you configured the ActivityQueueService](https://git.startinblox.com/djangoldp-packages/djangoldp/blob/master/djangoldp/conf/server_template/server/wsgi.py-tpl#L21-24)

djangoldp_notification/check_integrity.py

+from django.apps import apps
+from django.conf import settings
+from django.db import models
+from djangoldp.models import Model
+from djangoldp_notification.models import send_request, Subscription
+from djangoldp_notification.middlewares import MODEL_MODIFICATION_USER_FIELD
+
+class technical_user:
+  urlid = settings.BASE_URL
+
+def add_arguments(parser):
+  parser.add_argument(
+    "--ignore-subscriptions",
+    default=False,
+    nargs="?",
+    const=True,
+    help="Ignore subscriptions related check",
+  )
+  parser.add_argument(
+    "--send-subscription-notifications",
+    default=False,
+    nargs="?",
+    const=True,
+    help="Send an update notification for every local resources to every subscribers",
+  )
+
+def check_integrity(options):
+  print('---')
+  print("DjangoLDP Notification")
+  if(not options["ignore_subscriptions"]):
+
+    models_list = apps.get_models()
+
+    resources = set()
+    resources_map = dict()
+
+    for model in models_list:
+      for obj in model.objects.all():
+        if hasattr(obj, "urlid"):
+          if(obj.urlid):
+            if(obj.urlid.startswith(settings.BASE_URL)):
+              if(type(obj).__name__ != "ScheduledActivity" and type(obj).__name__ != "LogEntry" and type(obj).__name__ != "Activity"):
+                resources.add(obj.urlid)
+                resources_map[obj.urlid] = obj
+    
+    print("Found "+str(len(resources_map))+" local resources on "+str(len(models_list))+" models for "+str(Subscription.objects.count())+" subscribers")
+
+    if(options["send_subscription_notifications"]):
+      sent=0
+      for resource in sorted(resources):
+        resource = resources_map[resource]
+        recipients = []
+        try:
+          url_container = settings.BASE_URL + Model.container_id(resource)
+          url_resource = settings.BASE_URL + Model.resource_id(resource)
+        except NoReverseMatch:
+          continue
+        for subscription in Subscription.objects.filter(models.Q(object=url_resource) | models.Q(object=url_container)):
+          if subscription.inbox not in recipients and not subscription.is_backlink:
+            # I may have configured to send the subscription to a foreign key
+            if subscription.field is not None and len(subscription.field) > 1:
+              try:
+                resource = getattr(resource, subscription.field, resource)
+
+                # don't send notifications for foreign resources
+                if hasattr(resource, 'urlid') and Model.is_external(resource.urlid):
+                    continue
+
+                url_resource = settings.BASE_URL + Model.resource_id(resource)
+              except NoReverseMatch:
+                continue
+              except ObjectDoesNotExist:
+                continue
+            setattr(resource, MODEL_MODIFICATION_USER_FIELD, technical_user)
+            try:
+              send_request(subscription.inbox, url_resource, resource, False)
+              sent+=1
+            except:
+              print("Failed to create subscription activity for "+url_resource)
+            recipients.append(subscription.inbox)
+      print("Sent "+str(sent)+" activities to "+str(Subscription.objects.count())+" subscribers")
+      print("Depending on your server configuration, you may have to restart the ActivityQueue or the server to properly process em.")
+    else:
+      print("Send an update notification for all those resources to all of their subscribers with  `./manage.py check_integrity --send-subscription-notifications`")
+  else:
+    print("Ignoring djangoldp-notification checks")
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