Class: Apprentice::Sentinel

Inherits:
Object
  • Object
show all
Includes:
Configuration, Server
Defined in:
lib/apprentice.rb

Overview

This defines the sentinel, i.e. tiny server, Apprentice uses to communicate with e.g. HAProxy’s httpchk method.

Instance Method Summary collapse

Methods included from Configuration

#check_type, #get_config

Constructor Details

#initialize ⇒ Sentinel

This depends on the Configuration module since it uses the Configuration#get_config method.

Return value

  • @options - set the global variable @options which is used inside #run the start the EventMachine server



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# File 'lib/apprentice.rb', line 19

def initialize
  @options = get_config
end

Instance Method Details

#run ⇒ Object

Starts the EventMachine server

Special conditions

We are trapping the signals INT and TERM here in order to shut down the EventMachine gracefully.

Attributes

  • @options.ip - The server binds to this specific ip

  • @options.port - The server uses this specific port to expose its limited HTTP interface to the world

  • @options - Gets passed to the server as a whole to be used with Server::EventServer#initialize



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# File 'lib/apprentice.rb', line 34

def run
  EM.run do
    Signal.trap('INT') { EventMachine.stop }
    Signal.trap('TERM') { EventMachine.stop }
    EventMachine.start_server(
        @options.ip,
        @options.port,
        Server::EventServer,
        @options
    )
  end
end