how to check if rule is loaded?

[UrsusS]

In some cases it can happen that a rule is not loaded when it should be called, e.g.

• if you have a circular dependency and thus you can't define the dependency on loading, and the system is still on startup
• in a test system where rules are sometimes loaded, sometimes not

I haven't found a function to test if the rule is available. Now I do something like this to not stop the function, but it still logs the KeyError.

        try:
            Rule = self.get_rule("MyRule")
            Rule.DoSomething()
        except KeyError:
            self.log.warning(
                LOGGER + "System noch nicht initialisiert - versuche später nochmal"
            )

I would prefer to have something like this:

        if self.is_rule_loaded("MyRule"):
            Rule = self.get_rule("MyRule")
            Rule.DoSomething()
        else:
            self.log.warning(
                LOGGER + "System noch nicht initialisiert - versuche später nochmal"
            )

Is this functionality already existing or can it get implemented?

[spacemanspiff2007]

You should specif the dependency with depends on. Otherwise you can just catch the error.