Cache the candidate listing rendered template (#369)

---------

Co-authored-by: Tudor Amariei <tudor.amariei@commitglobal.org>

backend/hub/templates/hub/candidate/list.html

@@ -60,6 +60,7 @@ <h2 class="section-title uppercase">
     <div class="container">
       {% if page_obj %}
 
+        {% cache listing_cache_duration listing_cache_key %}
         <div class="is-multiline infinite-container">
 
           {% if not SINGLE_DOMAIN_ROUND %}
@@ -68,6 +69,7 @@ <h2 class="section-title uppercase">
             {% include "hub/candidate/components/listing_detail.html" %}
           {% endif %}
         </div>
+        {% endcache %}
 
       {% endif %}
     </div>

backend/hub/views.py

@@ -1,5 +1,6 @@
 import logging
 import unicodedata
+import hashlib
 from datetime import datetime
 from typing import Dict, List, Optional, Union
 from urllib.parse import unquote
@@ -584,7 +585,6 @@ def _get_candidate_counters(self):
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        context["listing_cache_duration"] = settings.TIMEOUT_CACHE_SHORT
         context["current_search"] = self.request.GET.get("q", "")
 
         context["should_display_candidates"] = False
@@ -600,6 +600,11 @@ def get_context_data(self, **kwargs):
 
         context["counters"] = self._get_candidate_counters()
         context["domains"] = Domain.objects.all()
+        context["listing_cache_duration"] = settings.TIMEOUT_CACHE_SHORT
+        # noinspection InsecureHash
+        context["listing_cache_key"] = hashlib.sha256(
+            f"candidates_listing_{current_domain if current_domain else ''}_{context['current_search']}".encode()
+        ).hexdigest()
 
         return context