Python script to colelct humidity and temperature from a DHT22 sensor and an ipmi server

humidity.py

#! /usr/bin/python3
import statsd
import Adafruit_DHT
import time
import boto3
import sys
import subprocess
import socket
from timeit import default_timer as timer


DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 4
statsd = statsd.StatsClient(STATSD_ENDPOINT, 8125, prefix='totomz.homelab')


def str2float(string, default=0.0):
    res = default
    try:
        res = float(string)
    except Exception:
        res = default

    return res


def collect_and_send(hostname, ip):
    try:
        out = subprocess.check_output("ipmitool -P root -U root -H {ip} sensor".format(ip=ip),
                                      stderr=subprocess.STDOUT,
                                      shell=True)
        stdout = str(out.decode('utf-8'))

        metrics = stdout.split("\n")
        for line in metrics:
            metric_line = line.lower()

            if "temp" not in metric_line:
                continue

            p = metric_line.split("|")
            metric_name = str.lower(str.strip(str.strip(p[0]))).replace(" ", "_")
            metric_value = str2float(str.strip(p[1]), 0)
            statsd.gauge("bmc.{host}.{metric_name}".format(host=hostname, metric_name=metric_name), metric_value)

    except Exception as e:
        # do nothing
        print(e)


print("Starting temperature and humidity monitoring service....")
sys.stdout.flush()

while True:

    ####################
    # Environment data #
    ####################
    start = timer()

    humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)

    if humidity is not None and temperature is not None:
        print("{2} Temp={0:0.1f}*C Humidity={1:0.1f}%".format(temperature, humidity, time.strftime("%Y-%m-%d %H:%M:%S")))
        sys.stdout.flush()

        statsd.gauge('rack.temp', temperature)
        statsd.gauge('rack.humidity', humidity)

    else:
        print("Failed to retireve temp {0} or humidity {1}".format(temperature,humidity))
        sys.stdout.flush()
    end = timer()
    print("temp & humidity: {}".format(end - start))



    ################
    # IPMI Metrics #
    ################
    start = timer()
    collect_and_send(hostname="ziobob", ip="192.168.10.30")
    end = timer()
    print("ziocharlie: {}".format(end - start))

    start = timer()
    collect_and_send(hostname="ziocharlie", ip="192.168.10.31")
    end = timer()
    print("ziocharlie: {}".format(end - start))

    time.sleep(5)