task/FP-982: Add rebuild_index haystack signal processor

taccsite_cms/settings.py

@@ -460,6 +460,7 @@ def get_subdirs_as_module_names(path):
 
 # Elasticsearch Indexing
 HAYSTACK_ROUTERS = ['aldryn_search.router.LanguageRouter',]
+HAYSTACK_SIGNAL_PROCESSOR = 'taccsite_cms.signal_processor.RealtimeSignalProcessor'
 ALDRYN_SEARCH_DEFAULT_LANGUAGE = 'en'
 ALDRYN_SEARCH_REGISTER_APPHOOK = True
 HAYSTACK_CONNECTIONS = {

taccsite_cms/signal_processor.py

@@ -0,0 +1,31 @@
+from haystack.signals import BaseSignalProcessor
+from django.db import models
+from django.core.management import call_command
+from cms import signals
+
+
+class RealtimeSignalProcessor(BaseSignalProcessor):
+    """
+    A signal processor to make a call to the Django Haystack
+    `rebuild_index` management command when a CMS document is
+    published, unpublished, or deleted. This will allow the
+    ElasticSearch index to remain up-to-date with the latest
+    published CMS content when a user searches the site.
+
+    Usage:
+        This signal processor hooks into Haystack via the
+        `HAYSTACK_SIGNAL_PROCESSOR` Django setting.
+    """
+
+    def setup(self):
+        signals.post_publish.connect(self.handle_save)
+        signals.post_unpublish.connect(self.handle_save)
+        models.signals.post_delete.connect(self.handle_save)
+
+    def teardown(self):
+        signals.post_publish.disconnect(self.handle_save)
+        signals.post_unpublish.disconnect(self.handle_save)
+        models.signals.post_delete.disconnect(self.handle_save)
+
+    def handle_save(self, **kwargs):
+        call_command('rebuild_index', '--noinput')