feat: Add healthcheck

src/fellchensammlung/tasks.py

@@ -1,5 +1,6 @@
 from notfellchen.celery import app as celery_app
 from .tools.admin import clean_locations, deactivate_unchecked_adoption_notices
+from .tools.misc import healthcheck_ok
 from .models import Location, AdoptionNotice
 
 
@@ -17,3 +18,7 @@ def task_deactivate_unchecked():
 def add_adoption_notice_location(pk):
     instance = AdoptionNotice.objects.get(pk=pk)
     Location.add_location_to_object(instance)
+
+@celery_app.task(name="tools.healthcheck")
+def task_healthcheck():
+    healthcheck_ok()

src/fellchensammlung/tools/misc.py

@@ -1,4 +1,8 @@
 import datetime as datetime
+import logging
+
+from notfellchen import settings
+import requests
 
 
 def pluralize(number, letter="e"):
@@ -11,11 +15,11 @@ def pluralize(number, letter="e"):
 
 def age_as_hr_string(age: datetime.timedelta) -> str:
     days = age.days
-    weeks = age.days/7
+    weeks = age.days / 7
-    months = age.days/30
+    months = age.days / 30
-    years = age.days/365
+    years = age.days / 365
     if years >= 1:
-        months = months - 12*years
+        months = months - 12 * years
         return f'{years:.0f} Jahr{pluralize(years)} und {months:.0f} Monat{pluralize(months)}'
     elif months >= 3:
         return f'{months:.0f} Monat{pluralize(months)}'
@@ -23,3 +27,10 @@ def age_as_hr_string(age: datetime.timedelta) -> str:
         return f'{weeks:.0f} Woche{pluralize(weeks, "n")}'
     else:
         return f'{days:.0f} Tag{pluralize(days)}'
+
+
+def healthcheck_ok():
+    try:
+        requests.get(settings.HEALTHCHECK_URL, timeout=10)
+    except requests.RequestException as e:
+        logging.error("Ping to healthcheck-server failed: %s" % e)

src/notfellchen/celery.py

@@ -1,8 +1,7 @@
-# <your_project>/celery.py
-
 import os
 from celery import Celery
 from celery.schedules import crontab
+from notfellchen import settings
 
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'notfellchen.settings')
 
@@ -19,7 +18,12 @@ app.conf.beat_schedule = {
     },
     'daily-deactivation': {
         'task': 'admin.deactivate_unchecked',
-        'schedule': 30,
+        'schedule': crontab(hour=1),
-    }
+    },
 }
 
+if settings.HEALTHCHECK_URL is not None:
+    # If a healthcheck is configured, this will send a daily ping to the healthchecks server
+    app.conf.beat_schedule['daily-healthcheck'] = {'task': 'tools.healthcheck',
+                                                   'schedule': crontab(hour=2),
+                                                   }

src/notfellchen/settings.py

@@ -84,6 +84,8 @@ LOCALE_PATHS = [os.path.join(BASE_DIR, 'locale')]
 CELERY_BROKER_URL = config.get("celery", "broker", fallback="redis://localhost:6379/0")
 CELERY_RESULT_BACKEND = config.get("celery", "backend", fallback="redis://localhost:6379/0")
 
+""" MONITORING """
+HEALTHCHECKS_URL = config.get("monitoring", "healthchecks_url", fallback=None)
 
 """ GEOCODING """
 GEOCODING_API_URL = config.get("geocoding", "api_url", fallback="https://nominatim.hyteck.de/search")