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watcher2.py
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watcher2.py
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# Watcher 2
# 3/24/2017 Derrick Stone
# This script monitors our application servers for timeout and
# application server errors
import xml.etree.ElementTree
import urllib2, urllib, time, threading, smtplib
from email.mime.text import MIMEText
import MySQLdb
def loadsystemconfig():
configuration = xml.etree.ElementTree.parse('config.xml').getroot()
# create some global settings from the system section of the config file
system={}
system['pollInterval'] = 120.0
for s in configuration.find('system').findall('setting'):
system[s.get('name')]= s.text
return system
def loadwatchingconfig():
configuration = xml.etree.ElementTree.parse('config.xml').getroot()
# load the list of urls to poll
watching={}
for u in configuration.find('threads').findall('resource'):
resource={}
resource['name']=u.get('name')
errorState[u.get('name')] = 0
# add a default timeout and agent
resource['timeout']=system['defaultTimeout']
resource['userAgent']=system['defaultUserAgent']
# STUB: Should be removing whitespace here
for p in u.findall('property'):
#print 'adding ', p.get('name')
resource[p.get('name')]=p.text
# add a property to monitor the errorlevel
resource['errorLevel'] = 0
watching[u.get('name')]=resource
return watching
def loadgroupconfig():
configuration = xml.etree.ElementTree.parse('config.xml').getroot()
#load the notification groups
groups={}
for g in configuration.find('recipients').findall('group'):
r={}
for x in g.findall('recipient'):
r[x.get('name')]=x.text
groups[g.get('name')]=r
return groups
def recordperformance(system,name,url,duration,errorLevel,errorDetail):
#if a database is sepecified, write to it, otherwise write to a file
if system.has_key('dbhost'):
conn = MySQLdb.connect(user=system['dbusername'],passwd=system['dbpassword'],host=system['dbhost'],db=system['dbname'])
cursor = conn.cursor()
cursor.execute("insert into log ( target, url, duration, errorlevel, errordetail ) values ( '%s', '%s', %s, %s, '%s')" % ( name, url, duration, errorLevel, errorDetail ) )
conn.commit()
cursor.close()
conn.close()
else:
f = open('log.txt','a')
f.write("%s\t%s\t%s\t%s\t%s" % name, url, duration, errorLevel, errorDetail)
def checksystems(system,watching,groups):
#lets try polling our resources
for i in watching:
print "testing %s at %s" % (watching[i]['name'] , watching[i]['url'])
errorLevelThisRun = 0
errorDetail=""
duration =0
agent = system['defaultUserAgent']
if watching[i]['userAgent'] != '':
agent = watching[i]['userAgent']
url = watching[i]['url']
timeout = system['defaultTimeout']
if watching[i]['timeout'] != '':
timeout=watching[i]['timeout']
headers = { 'User-Agent': agent}
values = {}
data = urllib.urlencode(values)
req = urllib2.Request(url, data, headers, timeout)
start = time.clock()
#first check for service errors
try:
response=urllib2.urlopen(req)
except URLError as e:
errorDetail = e.reason
errorLevelThisRun = 1
except HTTPError as e:
errorDetail = e.reason
errorLevelThisRun = 1
#then check for application errors
result=response.read()
duration = time.clock() - start
if duration * 1000 >= timeout:
#taking too long to run, generate an error level
errorLevelThisRun = 1
errorDetail = "request exceeded %s timeout" % timeout
if len(watching[i]['goodText']) > 0 and watching[i]['goodText'] not in result:
errorDetail = "missing required good text"
errorLevelThisRun = 1
if len(watching[i]['badText']) > 0 and watching[i]['badText'] in result:
errorDetail = "found error text"
errorLevelThisRun = 1
#print "executed in %s" % duration
#print "returning an errorLevel of %s" % errorLevelThisRun
recordperformance(system,watching[i]['name'],url,duration,errorLevelThisRun,errorDetail)
#either increment the error level or reset it to zero
if errorLevelThisRun == 1:
#watching[i]['errorLevel'] = watching[i]['errorLevel']+1
errorState[watching[i]['name']]=errorState[watching[i]['name']]+1
print "resource failed"
else:
#watching[i]['errorLevel'] = 0
errorState[watching[i]['name']]=0
print "resource passed"
if int(errorState[watching[i]['name']]) == int(watching[i]['errorCountTrigger']):
print "XXXXXX\nsend a notice\nXXXXX"
msg=MIMEText('Alert! there is a server problem - %s' % errorDetail)
msg['Subject']='Server Alert - %s' % watching[i]['name']
msg['From']='[email protected]'
#msg['To']='[email protected]'
s=smtplib.SMTP('email-smtp.us-west-2.amazonaws.com')
s.starttls()
s.login('[email protected]','Fr0ntJ@b')
for recipient in groups[watching[i]['notificationGroup']]:
#recipient,
msg['To']=groups[watching[i]['notificationGroup']][recipient]
s.sendmail('[email protected]',msg['To'],msg.as_string())
s.quit()
if __name__ == '__main__':
#one variable to track ongoing errors
global errorState
errorState= {}
#load configurations
system = loadsystemconfig()
watching = loadwatchingconfig()
groups = loadgroupconfig()
while True:
checksystems(system,watching,groups)
time.sleep(float(system['pollInterval']))
print "done!"