Controlling supervisord from Ruby using XMLRPC over Unix sockets.

supervisor.rb

require "net/http"
require "socket"

gem "libxml-xmlrpc"
require "xml/libxml/xmlrpc"

module Supervisor
  class << self
    attr_accessor :socket_path
    
    def namespace
      @namespace ||= :supervisor
    end
    attr_writer :namespace
    
    def make_socket
      Net::BufferedIO.new(UNIXSocket.new(socket_path))
    end
    
    def call(method, *args)
      method = method.to_s
      method = "supervisor.#{method}" unless method.include?('.')
      socket = make_socket
      
      req = Net::HTTP::Post.new("/RPC2")
      req.body = XML::XMLRPC::Builder.call(method, *args)
      req.content_type = "text/xml"
      req.exec(socket, "1.1", "/RPC2")
      
      res = nil
      loop do
        res = Net::HTTPResponse.read_new(socket)
        break unless res.is_a? Net::HTTPContinue
      end
      
      res.reading_body(socket, true) { }
      XML::XMLRPC::Parser.new(res.body).first
    end
  end
end

supervisor_control_example.rb

require_relative 'supervisor'

Supervisor.socket_path = "/tmp/supervisor.sock" # Use your socket path here

Supervisor.call :getState
#=> {:statename=>"RUNNING", :statecode=>1}

# See http://supervisord.org/api.html for all available XMLRPC methods.
# Use the supervisor_twiddler plugin (https://github.com/mnaberez/supervisor_twiddler) for additional XMLRPC methods.