Add /health/ready endpoint

Fixes #98

bugsink/urls.py

@@ -13,7 +13,7 @@ from users.views import signup, confirm_email, resend_confirmation, request_rese
 from ingest.views import download_envelope
 from files.views import chunk_upload, artifact_bundle_assemble
 
-from .views import home, trigger_error, favicon, settings_view, silence_email_system_warning, counts
+from .views import home, trigger_error, favicon, settings_view, silence_email_system_warning, counts, health_check_ready
 from .debug_views import csrf_debug
 
 
@@ -25,6 +25,8 @@ admin.site.index_title = "Admin"  # everyone calls this the "admin" anyway. Let'
 urlpatterns = [
     path('', home, name='home'),
 
+    path("health/ready", health_check_ready, name="health_check_ready"),
+
     path("accounts/signup/", signup, name="signup"),
     path("accounts/resend-confirmation/", resend_confirmation, name="resend_confirmation"),
     path("accounts/confirm-email/<str:token>/", confirm_email, name="confirm_email"),

bugsink/views.py

@@ -98,6 +98,20 @@ def home(request):
     return redirect("team_list")
 
 
+@login_exempt
+def health_check_ready(request):
+    """
+    A simple health check that returns 200 if the server is up and running. To be used in containerized environments
+    in a way that 'makes sense to you', e.g. as a readiness probe in Kubernetes.
+
+    What this "proves" is that the application server is up and accepting requests.
+
+    By design, this health check does not check the database connection; we only make a statement about _our own
+    health_; this is to avoid killing the app-server if the database is down.
+    """
+    return HttpResponse("OK", content_type="text/plain")
+
+
 @login_exempt
 def trigger_error(request):
     raise Exception("Exception triggered on purpose to debug error handling")