Automatically remove dead nodes (#18)

* remove nodes if all the health checks are failed

* use utc

* node should have at least 5 health checks

xmrnodes/app.py

@@ -157,7 +157,7 @@ def add():
     return redirect("/")
 
 def cleanup_health_checks():
-    diff = datetime.now() - timedelta(hours=24)
+    diff = datetime.utcnow() - timedelta(hours=24)
     checks = HealthCheck.select().where(HealthCheck.datetime <= diff)
     for check in checks:
         print("Deleting check", check.id)
@@ -201,6 +201,11 @@ def check():
             node.datetime_checked = now
             node.save()
             hc.save()
+        if node.get_failed_checks().count() == node.get_all_checks().count() and node.get_all_checks().count() > 5:
+            print('this node fails all of its health checks - deleting it!')
+            for _hc in node.get_all_checks():
+                _hc.delete_instance()
+            node.delete_instance()
 
 @app.cli.command("get_peers")
 def get_peers():

xmrnodes/models.py

@@ -23,6 +23,14 @@ class Node(Model):
     datetime_failed = DateTimeField(default=None, null=True)
     fail_reason = CharField(null=True)
 
+    def get_failed_checks(self):
+        hcs = HealthCheck.select().where(HealthCheck.node == self, HealthCheck.health == False)
+        return hcs
+
+    def get_all_checks(self):
+        hcs = HealthCheck.select().where(HealthCheck.node == self)
+        return hcs
+
     class Meta:
         database = db