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Process Monit HTTP/XML

Project description

Nomit is a small library that can be used to process HTTP/XML POST requests from Monit instances. While it is a relatively trivial adaption of Python’s BaseHTTPRequestHandler, it may be useful to multiple other projects. For this reason Nomit is registered as its own little project.

Monit is a free utility for managing Unix systems. Multiple Monit instances can be centrally managed by its sister project MMonit. Monit communicates with MMonit through HTTP/XML POST request.


Nomit uses the lxml.objectify module from the lxml project. Many Linux distributions provide lxml in their native package format.

The MonitHandler class

Nomit provides a single class MonitHandler which is a sub-class of BaseHTTPRequestHandler. MonitHandler is meant to be sub-classed itself.

It provides two methods:

  • handle_unparsed() is called with the raw XML of the HTTP/XML POST request.
  • handle_parsed() is called after the XML has been parsed by lxml.objectify.fromstring().

The default implementation of these methods does nothing. Any derived class must implement these methods as necessary.


The example below implements handle_unparsed() to print the raw XML as POSTed by the Monit agent and uses handle_parsed() to display the data structure returned by lxml.objectify.fromstring():

import BaseHTTPServer
import xml.dom.minidom
import lxml.objectify
import nomit

class ExampleHandler(nomit.MonitXmlHandler):
    def handle_unparsed(self, s):
        print xml.dom.minidom.parseString(s).toprettyxml()

    def handle_parsed(self, o):
        print lxml.objectify.dump(o)

server = BaseHTTPServer.HTTPServer(("", 2811), ExampleHandler)

Monit configuration

The Monit agent must be told to POST status information to the Python script above. From the agent’s point of view the script is simply (another[1]_) MMonit server.


set mmonit

_[1] The set mmonit directive accepts multiple URLs.

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