Source code for caspia.gateway.services.sensors.light.analog

from caspia.gateway.services import GatewayService
from caspia.meadow.client import characteristic_read_handler
from caspia.meadow.errors import SensorFailureError
from caspia.meadow.services import LightSensorBase
from caspia.node.components.sensors.analog import AnalogSensor


class AnalogLightSensor(GatewayService, LightSensorBase):
    auto_discovery = False

    def configure(self):
        self.analog_c: AnalogSensor = self.network.get_configured_component(
            self.get_node(), AnalogSensor, self.config['analog'])
        self.equation = self.config['equation']
        self.params = self.config['params']

    @property
    def is_updated_periodically(self):
        return self.config['analog'].interval != 0

    @property
    def dependant_components(self):
        return {self.analog_c}

    def convert_ratio_to_resistance(self, ratio):
        if ratio == 1:
            return 100000000
        elif ratio == 0:
            return 0
        return 12000 * (1 / (1 / ratio - 1))

    def convert_from_raw(self, raw):
        resistance = self.convert_ratio_to_resistance(raw)
        return self.equation(self.params, resistance)

    async def on_component_event(self, component, event):
        if self.analog_c == component:
            if isinstance(event, AnalogSensor.MeasurementEvent):
                if not event.error:
                    value = self.convert_from_raw(event.value)
                else:
                    value = SensorFailureError('sensor reported an error')
                await self.notify(self.light, value)

    @characteristic_read_handler('light')
    async def light_read(self, **kwargs):
        if self.is_updated_periodically:
            raw, error = self.analog_c.state.value, self.analog_c.state.error
        else:
            raw = await self.analog_c.measure()
            error = raw is None
        if error:
            raise SensorFailureError(message='temperature not available')
        lux = self.convert_from_raw(raw)
        return lux