Monitor HTTP content

[watership]

Hi,

How can you monitor the HTML content of a response from a HTTP service? In HQ (4.6.6, open source), I created a HTTP service to fetch the HTML (which is dynamically created by python).

• The HTML specificies the service' status. If one of its components is malfunctioning it will put the text 'ERROR' into the html.
• The service will always return a HTTP 200, so the status code cannot be used for monitoring.

The HTTP service is configured as follows:

• GET Method
• Pattern field: empty
• service.log_track.enable: true
• service.log_track.level: ERROR         (Is this relevant? It's not a log file but an unstructured html)

The alert definition:

• If condition: Events/logs Level ANY and match substring ERROR

It's unclear if the log settings in the HTTP service and alert definition also apply to filtering HTTP content. I tried several combinations but none seem to work.

Egon

[watership]

I created a workaround: a script plugin that calls a shell script which in turn calls a Python script that fetches and filters the html page. See the files below. Hopefully somebody knows how to perform the test via the HTTP service because this workaround is a bit kludgy.

htmlfilter.sh  (to be called by the Hyperic script plugin)

--------------------------------------------------------------------------------------

#!/bin/bash

url=$1

filter=$2

status=`python /home/hyperic/script/htmlfilter.py $url $filter`

echo $status

htmlfilter.py  (to be called by the htmlfilter shell script)

--------------------------------------------------------------------------------------

## Python 2.7

import sys,urllib

url = sys.argv[1]

searchstr = sys.argv[2]

response = urllib.urlopen(url)

html = str(response.read())

response.close()

if html.find(searchstr) == -1:

        print("status=0")

else:

        print("status=1")

htmlfilter-plugin.xml   (Hyperic script plugin)

-----------------------------------------------------------------------

<plugin>

  <service name="HtmlFilter">

  <config>

    <option name="script"

            description="HTML page filter"

            default="/home/hyperic/script/htmlfilter.sh"/>

    <option name="url"

            description="URL"/>

    <option name="filter"

            description="Filter"

            default="ERROR"/>

  </config>

  <filter name="template-exec"

          value="exec:file=%script%,args=%url% %filter%"/>

  <metric name="HtmlFilter"

          category="PERFORMANCE"

          indicator="true"

          interval="600000"

          template="${template-exec}:status"/>

</service>

</plugin>