mc-rpc-restserver.rb

#!/usr/bin/env ruby

# A very simple demonstration of writing a REST server
# for Simple RPC clients that takes requests over HTTP
# and returns results as JSON structures.

require 'rubygems'
require 'sinatra'
require 'mcollective'
require 'json'

include MCollective::RPC

# http://<your box>/mcollective/rpctest/echo/msg=hello%20world
#
# Creates a new Simple RPC client for the 'rpctest' agent, calls
# the echo action with a message 'hello world'.
#
# Returns all the answers as a JSON data block
get '/mcollective/:agent/:action/*' do
  mc = rpcclient(params[:agent])
  mc.discover

  arguments = {}

  # split up the wildcard params into key=val pairs and
  # build the arguments hash
  params[:splat].each do |arg|
    arguments[$1.to_sym] = $2 if arg =~ /^(.+?)=(.+)$/
  end

  JSON.dump(mc.send(params[:action], arguments).map{|r| r.results})
end