def read_temp(scale="F"):
""" read_temp parses raw temperature data output
:param: temperature scale type "F" or "C"
:type: string
:returns: temperature data in fahrenheit or celsius
:rtype: float
"""
lines = read_temp_raw()
count = 0
max_loops = 10
while (lines[0].strip()[-3:] != 'YES'):
time.sleep(0.2)
lines = read_temp_raw()
count = count + 1
if (count == max_loops):
error = "The 'read_temp' function made " + str(max_loops) + " attempts to read output and failed: " + lines
log.error(error)
if alert_now(alert_file):
send_mail(script_name, script_name + " running on '" + local_host + "' could not read temperature data output", error)
sys.exit(3)
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
if (scale == "C"):
return round_up_two(temp_c)
else:
temp_f = temp_c * 9.0 / 5.0 + 32.0
return round_up_two(temp_f)
def read_temp_raw():
"""read_temp_raw retrieves temperature data from DS18B20 sensor
:returns: raw temperature data
:rtype: list
"""
try:
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
f = open(device_file, 'r')
try:
lines = f.readlines()
return lines
finally:
f.close()
except (IndexError, IOError), e:
error = "read_temp_raw encountered an error: %s %s" % (e.__class__, e)
log.error(error)
if alert_now(alert_file):
send_mail(script_name, script_name + " running on '" + local_host + "' could not read raw temperature data", error)
sys.exit(2)
return True
else:
return False
log.info("BEGIN LOGGING")
current_temp = None
try:
current_temp = get_current_temp()
log.info("Current temp returned: " + str(current_temp))
spreadsheet_data = [datetime.datetime.now().isoformat(), current_temp]
log.info("Spreadsheet input generated: " + str(spreadsheet_data))
except Exception, e:
error = "Error getting current temperature %s %s" % (e.__class__, e)
log.error(error)
if alert_now(alert_file):
send_mail(script_name, script_name + " running on '" + local_host + "' could not retrieve data properly from thermostat(" + config.thermostat_address + ")", error)
sys.exit(1)
if (current_temp <= minimum_temperature):
error = "The current temperature is " + str(current_temp) + " degrees. The alert threshold is " + str(minimum_temperature) + " degrees."
log.error(error)
if alert_now(alert_file):
send_mail(script_name, "CRITICAL ALERT from " + script_name + ": Temperature reading passed alert threshold", error)
try:
log.info("Attempting to login to Google.")
gc = get_gspread_client_login()
except Exception, e:
error = "Google login error: %s %s" % (e.__class__, e)
log.error(error)