Maxwell agent

The intention of this is as yet another Nagios replacement. It is an single process, multithreaded monitoring agent It is based on the Celluloid Actor framework.

This is 1 part of 3 piece monitoring framework.

Maxwell agent(this)

the actual monitoring process

Maxwell agent reporting WUI -

View check results/stats (akin to the main Nagios WUI)

server

Store agents configs
View agent results
Agents check in to get configuration
Agents check in to report check results and other statistics

This is still in early development, use at your own risk

To use:

require 'maxwell/agent'
Maxwell::Agent.start!

Check out config/schedule.rb for an example on how to schedule work.
Major changes are coming to this configuration, what's here now is for example only.

Everything is currently kept only in-memory.
If the agent is restarted all data will be lost

Middleware

You can write your own middleware which gets run after each check is performed.
In the middleware you have access to the "work" object.
The work object is where check results and other bits of info are stored.

To write your middleware:

module Maxwell
  module Agent
    module Middleware
      class MyAwesomeMiddlewares
        def call(work)
          # Some awesome stuff before passing to the next item in the chain
          yield
          # Some more awesome stuff once the chain bubbles back up
        end
      end
    end
  end
end

You register your middleware as such:

Maxwell::Agent.configure do |config|
  config.middleware do |chain|
    chain.add Maxwell::Middleware::MyAwesomeMiddlewares
  end
end

Your middleware must define a "call" method.
Everything before the yield is called before passing on to the next middleware
Everything after the yield is called after the rest of the middleware stack has run
If you do not yield in your middleware call it will break the chain (and likely the app)

Contributing to agent