devstream/shadow.py at main · diegofps/devstream · GitHub

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from devstreamlog import DevStreamLogger


class Shadow:

    def __init__(self, name=None):
        self.name = type(self).__name__ if name is None else name
        self.state_name = f"{self.name}>STATE"
        self.required_devices = set()
        self.reflex_kwargs = {}
        self.active = False
        self.reflexes = {}
        self.mind = None

        self.log = DevStreamLogger(filename=f"{self.name}.log")
        self.log.info(f"Creating shadow {self.name}")

    def add_reflex(self, ReflexType, *args, **kwargs):
        reflex = ReflexType(*args, **{**self.reflex_kwargs, **kwargs})
        assert not reflex.name in self.reflexes, f"Shadow {self.name} already contains a reflex with the name {reflex.name}"
        self.reflexes[reflex.name] = reflex
        reflex.attach(self)
        return reflex

    def remove_reflex(self, reflex_name):
        if reflex_name in self.reflexes:
            reflex = self.reflexes[reflex_name]
            del self.reflexes[reflex_name]
            reflex.dettach()

    def require_device(self, device_name):
        self.log.debug(f"Requiring device_name=\"{device_name}\"")
        self.required_devices.update(device_name)

    def attach(self, mind):
        assert not self.is_attached(), "This shadow is already attached to a mind"
        assert not self.is_activated(), "This shadow is already activated"

        self.log.info(f"Attaching shadow {self.name} to mind")
        self.mind = mind

        self.on_configure()

    def dettach(self):
        assert self.is_attached(), "This shadow is not attached to a mind"

        self.log.info(f"Dettaching shadow {self.name}")

        if self.is_activated():
            self.deactivate()

        self.mind = None

    def activate(self):
        self.log.debug(f"Inside activate for shadow {self.name}")

        assert self.is_attached(), "This shadow is not attached"
        assert not self.is_activated(), "This shadow is already activated"

        self.active = True
        self.mind.add_listener(self.state_name, self.on_state_changed)
        self.mind.require_device(self.required_devices)

        for reflex in self.reflexes.values():
            if reflex.autostart or reflex.keepalive:
                self.log.debug(f"Shadow {self.name} is activating reflex {reflex.name}")
                reflex.activate()

        self.on_activate()

    def shift_reflex(self, reflex_name, *args, **kwargs):
        self.log.debug(f"Shifting to reflex {reflex_name}, args={args}m kwargs={kwargs} within shadow {self.name}")
        assert self.is_attached(), "Needs to be attached to use activate_reflex"
        self.mind.emit(self.state_name, (reflex_name, args, kwargs), 50)

    def deactivate(self):
        self.log.debug(f"Deactivating shadow {self.name}")

        assert self.is_attached(), "This shadow is not attached"
        assert self.is_activated(), "This shadow is not activated"

        self.mind.remove_listener(self.state_name, self.on_state_changed)

        for reflex in self.reflexes.values():
            if reflex.is_activated():
                reflex.deactivate()

        # TODO: Unrequire devices from mind?

        self.active = False
        self.on_deactivate()

    def is_attached(self):
        return self.mind is not None

    def is_activated(self):
        return self.active

    def on_configure(self, **reflex_kwargs):
        if not 'log_prefix' in reflex_kwargs:
            reflex_kwargs['log_prefix'] = self.name
        self.reflex_kwargs = reflex_kwargs
        self.require_device(reflex_kwargs.get('required_devices', []))

    def on_activate(self):
        pass

    def on_deactivate(self):
        pass

    def on_state_changed(self, topic_name, event):
        self.log.info(f"Received an state changed event at shadow {self.name}: topic={topic_name}, event={event}")

        reflex_name, args, kwargs = event
        target_reflex = None

        for reflex in self.reflexes.values():
            if reflex.name == reflex_name:
                target_reflex = reflex
                break

        if target_reflex is None:
            self.log.warn(f"Shadow {self.name} if trying to shift reflexes but couldn't find the target reflex {reflex_name}, args={args}, kwargs={kwargs}")

        elif target_reflex.is_activated():
            self.log.warn(f"Shadow {self.name} if trying to shift reflexes but the target reflex {reflex_name} is already activated, args={args}, kwargs={kwargs}")

        else:
            for reflex in self.reflexes.values():
                if reflex != target_reflex and not reflex.keepalive:
                    if reflex.is_activated():
                        reflex.deactivate()

            target_reflex.activate(*args, **kwargs)