#!/usr/bin/python
import sys
import Adafruit_DHT
import os
from munin import MuninPlugin

class DHT11Plugin(MuninPlugin):
    title = "DHT11 Humidity"
    args = "--base 1000 -l 0"
    vlabel = "percent"
    scale = False
    category = "sensors"

    @property
    def fields(self):
        warning = os.environ.get('hum_warn', 90)
        critical = os.environ.get('hum_crit', 95)
        return [("hum", dict(
                label = "Humidity",
                info = 'Humidity as reported by a DHT11 sensor',
                type = "GAUGE",
                min = "0",
                max = "100",
                warning = str(warning),
                critical = str(critical)))]

    def execute(self):
        pin = int(os.environ.get('dht11_pin', '2'))
        humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT11, pin)
        return dict(hum=humidity)

if __name__ == "__main__":
    DHT11Plugin().run()