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checker.py
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checker.py
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#!/usr/bin/python
# checker
# Make sure the critical EcoSpec components keep running
import datetime
import ecospec
import pifacedigitalio
import piface
import subprocess
import sys
import time
import traceback
def log(message):
logfile = open('/var/log/checker/checker.log' ,'a', 0)
logfile.write(str(datetime.datetime.today()) + " checker: " + str(message) + "\n")
logfile.close()
log("starting up")
actuator_under_control = False
pifacedigitalio.init()
time.sleep(10)
piface_instance = piface.PiFace()
while True:
log("Checking if ecospec.py is running at " + str(datetime.datetime.today()))
try:
result = subprocess.check_output("ps -A | grep ecospec", shell=True)
except subprocess.CalledProcessError:
result = ""
if not actuator_under_control:
if (result + ' ') == ' ':
log("No it's not, so let's start it!")
try:
result = subprocess.check_output("service ecospec start", shell=True)
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
result = ""
log(result + "")
else:
log("Yes it is.")
log('Checking if wvdial is running at ' + str(datetime.datetime.today()))
try:
wvdial = subprocess.check_output("ps -A | grep wvdial", shell=True)
except subprocess.CalledProcessError:
wvdial = ""
if (wvdial + ' ') == ' ':
log("No it's not, so let's start it!")
try:
wvdial = subprocess.check_output("service wvdial start", shell=True)
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
wvdial = ""
log(wvdial + "")
else:
log("Yes it is.")
log("Checking if mover.py is running at " + str(datetime.datetime.today()))
try:
result = subprocess.check_output("ps -A | grep mover", shell=True)
except subprocess.CalledProcessError:
result = ""
if not actuator_under_control:
if (result + ' ') == ' ':
log("No it's not, so let's start it!")
try:
result = subprocess.check_output("service mover start", shell=True)
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
result = ""
log(result + "")
else:
log("Yes it is.")
# Check the PiFace buttons for the next ten minutes
log('Checking if a pushbutton is being pressed at ' + str(datetime.datetime.today()))
for i in range(1, 60):
if pifacedigitalio.digital_read(0):
log("PiFace pushbutton 1 pressed. Shutting down.")
result = ""
try:
shutdown = subprocess.check_output("shutdown -h now", shell=True)
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
shutdown = ""
log(shutdown + "")
elif pifacedigitalio.digital_read(1):
log("PiFace pushbutton 2 pressed. Rebooting.")
result = ""
try:
result = subprocess.check_output("reboot", shell=True)
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
result = ""
log(result + "")
elif pifacedigitalio.digital_read(2):
log("PiFace pushbutton 3 pressed. Extending actuator.")
result = ""
try:
log("stopping service ecospec")
result = subprocess.check_output("service ecospec stop", shell=True)
actuator_under_control = True
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
result = ""
try:
log("extending white reference arm")
piface_instance.extend_white_reference_arm(ecospec.EcoSpec.ACTUATOR_RELAY)
except:
xtype, xvalue, xtb = sys.exc_info()
log("{0}".format(xtype))
log("{0}".format(xvalue))
traceback.print_tb(xtb, None, logfile)
log("{0}".format(str(result)))
elif pifacedigitalio.digital_read(3):
log("PiFace pushbutton 4 pressed. Retracting actuator.")
result = ""
try:
log("retracting white reference arm")
piface_instance.retract_white_reference_arm(ecospec.EcoSpec.ACTUATOR_RELAY)
except:
xtype, xvalue, xtb = sys.exc_info()
log("{0}".format(xtype))
log("{0}".format(xvalue))
traceback.print_tb(xtb, None, logfile)
try:
log("starting service ecospec")
result = subprocess.check_output("service ecospec start", shell=True)
actuator_under_control = False
except subprocess.CalledProcessError as error:
log("CalledProcessError({0}): {1}".format(error.errno, error.strerror))
result = ""
log("{0}".format(str(result)))
else:
pass
time.sleep(5)
log("shuting down")