feat(notifications): add redis-backed sse notification streaming

config/settings/base.py

@@ -45,6 +45,7 @@ LOCAL_APPS = [
     "apps.projects",
     "apps.tags",
     "apps.time_entries",
+    "apps.notifications",
 ]
 
 INSTALLED_APPS = DJANGO_APPS + THIRD_PARTY_APPS + LOCAL_APPS
@@ -202,10 +203,35 @@ CELERY_ACCEPT_CONTENT = ["json"]
 CELERY_TASK_SERIALIZER = "json"
 CELERY_RESULT_SERIALIZER = "json"
 CELERY_TASK_ALWAYS_EAGER = False
-CELERY_IMPORTS = ("apps.users.tasks",)
 CELERY_TIMEZONE = os.getenv("TIME_ZONE")
 CELERY_TASK_TRACK_STARTED = True
 
+NOTIFICATIONS_ENABLED = os.getenv("NOTIFICATIONS_ENABLED", "True") == "True"
+NOTIFICATION_STREAM_TOKEN_LIFETIME_SECONDS = int(
+    os.getenv("NOTIFICATION_STREAM_TOKEN_LIFETIME_SECONDS", "90")
+)
+NOTIFICATION_SSE_HEARTBEAT_SECONDS = int(
+    os.getenv("NOTIFICATION_SSE_HEARTBEAT_SECONDS", "20")
+)
+NOTIFICATION_SSE_RETRY_MS = int(os.getenv("NOTIFICATION_SSE_RETRY_MS", "5000"))
+NOTIFICATION_DEFAULT_PAGE_SIZE = int(
+    os.getenv("NOTIFICATION_DEFAULT_PAGE_SIZE", "20")
+)
+NOTIFICATION_MAX_PAGE_SIZE = int(os.getenv("NOTIFICATION_MAX_PAGE_SIZE", "50"))
+NOTIFICATION_REDIS_CHANNEL_PREFIX = os.getenv(
+    "NOTIFICATION_REDIS_CHANNEL_PREFIX", "notif:user"
+)
+NOTIFICATION_RETENTION_DAYS = int(os.getenv("NOTIFICATION_RETENTION_DAYS", "30"))
+NOTIFICATION_TOAST_LEVELS = tuple(
+    level.strip()
+    for level in os.getenv(
+        "NOTIFICATION_TOAST_LEVELS", "info,success,warning,error"
+    ).split(",")
+    if level.strip()
+)
+
+CELERY_IMPORTS = ("apps.users.tasks", "apps.notifications.tasks")
+
 
 STORAGES = {
     "default": {"BACKEND": "django.core.files.storage.FileSystemStorage"},

config/urls.py

@@ -21,6 +21,7 @@ urlpatterns = [
     path('api/', include('apps.projects.api.urls'), name="projects"),
     path('api/', include('apps.tags.api.urls'), name="tags"),
     path('api/', include('apps.time_entries.api.urls'), name="time_entries"),
+    path("api/notifications/", include("apps.notifications.urls"), name="notifications"),
 ]
 
 if settings.DEBUG: