Munin plugin:

#!/usr/bin/python
”’
Plugin to measure response times for urls.
This is useful as a sort of final availability measurement.

How to configure:
[httpresponsetime]
env.urls http://www.google.com, http://www.yahoo.com/something

Put the urls you’d like to check, separated by commas in your conf file.

Requires httplib2 for python (easy_install httplib2, or http://code.google.com/p/httplib2/ )
Graphs the time (in milliseconds) for the response of the url(s) provided.
If the http request fails (4XX, 5XX) will output -1, which is marked as
critical.

Arthur Debert
http://www.stimuli.com.br
FreeBSD licensed
”’
import sys, os

# the main configuration node
config = {
“master” : {
“graph_title” : ‘Http Response Times’,
“graph_args” : ‘–base 1000 -l 0’,
“graph_vlabel” : ‘Time (in milliseconds)’,
“graph_category” : ‘Http Monitoring’,
“graph_scale” : ‘no’,
“label” : ‘Response times’,

},
“url_to_check” : {
“label” : ‘%(url)s’,
“type” : ‘GAUGE’,
“min” : ‘-1’,
“max” : ‘2000’,
“draw” : ‘LINE2’,
“info” : ‘Time (in milliseconds) for response’,
“warning”: “0:1500”,
“critical”: “0:2000”,
},
}

def get_config(urls):
for key,value in config[‘master’].items():
print “%s %s” % (key, value)
for url in urls:
for key, value in config[“url_to_check”].items():
value = value % ({“url”:url})
printable_url = get_printable_url(url)
print “%s.%s %s” % (printable_url, key, value)

def get_printable_url(url):
”’
Makes a field name friendly version of the url, as the rdd config commands
will not allow slashes, dots and other characters.
”’
import urlparse
parsed = urlparse.urlsplit (url)
return (“%s_%s_%s” % (parsed[1] , parsed[2], parsed[3])).replace(“/”, “_”).replace(“.”, “_”).replace(‘-‘,’_’)

def get_request_time(url):
”’
Returns the time, in millseconds, for the request to be fetched.
Returns -1 on failuer (Http status code other that 200 > x > 400
”’
import httplib2, time
fetcher = httplib2.Http()
initial = time.time()
resp, content = fetcher.request(url)
duration = int((time.time() – initial) * 1000)
resp_code = int(resp[“status”])
if 200 <= resp_code < 400: return duration return -1 def get_urls(): try: return os.environ["urls"].split(",") except KeyError: print "You needto specify which URLS to monitor by setting the 'urls' env variable in your munin-conf." sys.exit(1) def run(): urls = get_urls() for url in urls: printable_url = get_printable_url(url) url_time = get_request_time(url) print "%s.value %s" % (printable_url, url_time) sys.exit(0) def exit_with_failure(msg): print msg sys.exit(1) def exit_with_success(): sys.exit(0) if __name__ == "__main__": try: import httplib2 except ImportError: exit_with_failure("This plugin requires the httplib2 (easy_install httplib2, or http://code.google.com/p/httplib2/ ) library for python, aborting.") if len(sys.argv) > 1:
cmd_name = sys.argv[1]
else:
cmd_name = None
if cmd_name and cmd_name == “autoconf”:
exit_with_failure(‘no’)
elif cmd_name and cmd_name == “suggest”:
print “”
exit_with_success()
elif cmd_name == “config”:
get_config(get_urls())
exit_with_success()
else:
run()
sys.exit(0)
exit_with_failure(“Unsupported command”)