Use signals to update internal ics

com/api.py

@@ -1,14 +1,10 @@
-from datetime import timedelta
 from pathlib import Path
 
 from django.conf import settings
 from django.http import Http404
-from django.urls import reverse
-from django.utils import timezone
-from ics import Calendar, Event
 from ninja_extra import ControllerBase, api_controller, route
 
-from com.models import IcsCalendar, NewsDate
+from com.models import IcsCalendar
 from core.views.files import send_raw_file
 
 
@@ -33,23 +29,4 @@ class CalendarController(ControllerBase):
 
     @route.get("/internal.ics")
     def calendar_internal(self):
-        calendar = Calendar()
-        for news_date in NewsDate.objects.filter(
-            news__is_moderated=True,
-            end_date__gte=timezone.now()
-            - (timedelta(days=30) * 60),  # Roughly get the last 6 months
-        ).prefetch_related("news"):
-            event = Event(
-                name=news_date.news.title,
-                begin=news_date.start_date,
-                end=news_date.end_date,
-                url=reverse("com:news_detail", kwargs={"news_id": news_date.news.id}),
-            )
-            calendar.events.add(event)
-
-        # Create a file so we can offload the download to the reverse proxy if available
-        file = self.CACHE_FOLDER / "internal.ics"
-        self.CACHE_FOLDER.mkdir(parents=True, exist_ok=True)
-        with open(file, "wb") as f:
-            _ = f.write(calendar.serialize().encode("utf-8"))
-        return send_raw_file(file)
+        return send_raw_file(IcsCalendar.get_internal())

com/apps.py

@@ -0,0 +1,9 @@
+from django.apps import AppConfig
+
+
+class ComConfig(AppConfig):
+    name = "com"
+    verbose_name = "News and communication"
+
+    def ready(self):
+        import com.signals  # noqa F401

com/models.py

@@ -37,6 +37,7 @@ from django.templatetags.static import static
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
+from ics import Calendar, Event
 
 from club.models import Club
 from core.models import Notification, Preferences, User
@@ -46,6 +47,7 @@ from core.models import Notification, Preferences, User
 class IcsCalendar:
     _CACHE_FOLDER: Path = settings.MEDIA_ROOT / "com" / "calendars"
     _EXTERNAL_CALENDAR = _CACHE_FOLDER / "external.ics"
+    _INTERNAL_CALENDAR = _CACHE_FOLDER / "internal.ics"
 
     @classmethod
     def get_external(cls, expiration: timedelta = timedelta(hours=1)) -> Path | None:
@@ -74,6 +76,35 @@ class IcsCalendar:
             _ = f.write(calendar.data)
         return cls._EXTERNAL_CALENDAR
 
+    @classmethod
+    def get_internal(cls) -> Path:
+        if not cls._INTERNAL_CALENDAR.exists():
+            return cls.make_internal()
+        return cls._INTERNAL_CALENDAR
+
+    @classmethod
+    def make_internal(cls) -> Path:
+        # Updated through a post_save signal on News in com.signals
+        calendar = Calendar()
+        for news_date in NewsDate.objects.filter(
+            news__is_moderated=True,
+            end_date__gte=timezone.now()
+            - (timedelta(days=30) * 60),  # Roughly get the last 6 months
+        ).prefetch_related("news"):
+            event = Event(
+                name=news_date.news.title,
+                begin=news_date.start_date,
+                end=news_date.end_date,
+                url=reverse("com:news_detail", kwargs={"news_id": news_date.news.id}),
+            )
+            calendar.events.add(event)
+
+        # Create a file so we can offload the download to the reverse proxy if available
+        cls._CACHE_FOLDER.mkdir(parents=True, exist_ok=True)
+        with open(cls._INTERNAL_CALENDAR, "wb") as f:
+            _ = f.write(calendar.serialize().encode("utf-8"))
+        return cls._INTERNAL_CALENDAR
+
 
 class Sith(models.Model):
     """A one instance class storing all the modifiable infos."""

com/signals.py

@@ -0,0 +1,9 @@
+from django.db.models.base import post_save
+from django.dispatch import receiver
+
+from com.models import IcsCalendar, News
+
+
+@receiver(post_save, sender=News, dispatch_uid="update_internal_ics")
+def update_internal_ics(*args, **kwargs):
+    _ = IcsCalendar.make_internal()

core/management/commands/populate.py

@@ -46,7 +46,7 @@ from accounting.models import (
     SimplifiedAccountingType,
 )
 from club.models import Club, Membership
-from com.models import News, NewsDate, Sith, Weekmail
+from com.models import IcsCalendar, News, NewsDate, Sith, Weekmail
 from core.models import Group, Page, PageRev, SithFile, User
 from core.utils import resize_image
 from counter.models import Counter, Product, ProductType, StudentCard
@@ -764,6 +764,7 @@ Welcome to the wiki page!
             ]
         )
         NewsDate.objects.bulk_create(news_dates)
+        IcsCalendar.make_internal()  # Force refresh of the calendar after a bulk_create
 
         # Create some data for pedagogy