- mruby_module for zabbix agent

mrbuy embedded loadable module for zabbix agent.
It adds "mruby.string[]" and "mruby.file[]" key.
These keys evaluates ruby code.

For example,
"mruby.string[1234 * 4]" returns "4936.000000".
"mruby.file[sample.rb]" with following file, it returns "hello world user 30"
------------------- sample.rb ------------------------
class Something
  def call()
    u = Userdata.new
    return "hello world " + u.name + " " + u.age.to_s
  end
end

def zbx_module_init()
  u = Userdata.new
  u.name = "user"
  u.age = 30
  return 'init world'
end

def zbx_module_run()
  return Something.new.call()
end

def zbx_module_uninit()
  return 'uninit world'
end
------------------------------------------------------

- Requirement
mruby compiled with "-fPIC" and mrbgems "Userdata"
Zabbix 2.2.*

- Compile
gcc -I/path/to/zabbix-2.2.*/include/ -I/path/to/mruby-1.0.0/include/ mruby_module.c /path/to/mruby-1.0.0/build/host/lib/libmruby*.a -shared -fPIC -o mruby_module.so

- Use
------------------------------------------------------
LoadModulePath=/path/to/mruby_module
LoadModule=mruby_module.so
------------------------------------------------------
ruby file in "/path/to/mruby_module/mruby" will be used in "mruby.file[]" key.
For example,
"/path/to/mruby_module/mruby/sample.rb" will be executed if "mruby.file[sample.rb]" is monitored.

ruby file should have zbx_module_init(), zbx_module_run(), zbx_module_uninit().
zbx_module_init() is called when agent starts.
zbx_module_run() is called when "mruby.file[filename]" is monitored.
zbx_module_uninit() is called when agent shutdown.