Class: Deadpool::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/deadpool/generator.rb

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ Generator

include FileUtils



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# File 'lib/deadpool/generator.rb', line 11

def initialize(argv)
  @argv     = argv
end

Instance Method Details

#execute_command(options) ⇒ Object 



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# File 'lib/deadpool/generator.rb', line 80

def execute_command(options)
  case options[:command]
  when :upstart_init
    generate_upstart_init options
  when :configuration
    generate_configuration options
  else
    help
  end
end

#generate_configuration(options) ⇒ Object

mkdir path/config/pools

path/config/environment.yml
path/config/pools/example.yml

mkdir path/lib/deadpool/monitor

path/lib/deadpool/monitor

mkdir path/lib/deadpool/failover_protocol

path/lib/deadpool/failover_protocol



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# File 'lib/deadpool/generator.rb', line 149

def generate_configuration(options)
  config_path = options[:config_path]
  path        = config_path
  FileUtils.mkdir_p(File.join(path, 'config/pools'))
  FileUtils.mkdir_p(File.join(path, 'lib/deadpool/monitor'))
  FileUtils.mkdir_p(File.join(path, 'lib/deadpool/failover_protocol'))
  File.open File.join(path, 'config/pools/example.yml'), 'w' do |file|
    file.write <<-EOF
pool_name:         'example_database'
primary_host:      '10.1.2.3'
secondary_host:    '10.2.3.4'
check_interval:    1
max_failed_checks: 10

# There can be only one monitor per pool at this time.  The deadpool system
# defines no rules for the monitor configuration except that it is called
# monitor_config: and has monitor_class: defined at the base level.  
# All other configuration variables are plugin specific.
monitor_config:
  monitor_class: Mysql
  nagios_plugin_path: '/usr/lib/nagios/plugins'

# There can be as many Failover Protocols as you want and you can use 
# the same plugin multiple times.  The deadpool defines no riles for the 
# failover protocol config except that it be an array element of 
# failover_protocol_configs and defines protocol_class at it's base.  The rest
# of the configuration is specific to the failover protocol.
failover_protocol_configs:
  - protocol_class: EtcHosts
script_path: '/usr/local/bin/deadpool_line_modifier'
service_host_name: 'master.mysql.example.project.client'
username: 'deadpool'
password: 'p4ssw0rd'
use_sudo: 1
client_hosts:
  - '10.3.4.5'   # app server 1 (web server)
  - '10.4.5.6'   # app server 2 (web server)

  - protocol_class: ExecRemoteCommand
test_command: '/etc/init.d/nginx status'
exec_command: '/etc/init.d/nginx restart'
username: 'deadpool'
password: 'p4ssw0rd'
use_sudo: 1
client_hosts:
  - '10.3.4.5'   # app server 1 (web server)
  - '10.4.5.6'   # app server 2 (web server)
    EOF
  end
  
  environment_config_path = File.join(path, 'config/environment.yml')
  environment_conf = <<-EOF
# log_path: '/var/log/deadpool.log'
# log_level: INFO
# system_check_interval: 30
# admin_hostname: 'localhost'
# admin_port: 5507

  EOF
  # if File.exists? environment_config_path
  #   puts "#{environment_config_path} already exists.  Here's what we would have copied there."
  #   puts environment_conf
  # else
  unless File.exists? environment_config_path
    File.open environment_config_path, 'w' do |file|
      file.write environment_conf
    end
  end
  
end

#generate_upstart_init(options) ⇒ Object 



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# File 'lib/deadpool/generator.rb', line 99

def generate_upstart_init(options)
  config_path         = options[:config_path]
  upstart_config_path = options[:upstart_config_path]
  upstart_init_path   = options[:upstart_init_path]
  upstart_script_path = options[:upstart_script_path]
  config_params       = config_path.nil? ? '' : "--config_path=#{config_path}"
  ruby_path           = `which ruby`.strip
  deadpool_admin_path = `which deadpool_admin`.strip
  
  upstart_conf =<<-EOF
description     "Deadpool Service"
author          "Kirt Fitzpatrick <[email protected]>"

umask 007
start on (net-device-up and local-filesystems)
stop on runlevel [016]
respawn
exec #{ruby_path} #{deadpool_admin_path} --foreground #{config_params}

  EOF

  if upstart_config_path
    File.open File.join(upstart_config_path), 'w' do |file|
      file.write upstart_conf
    end
    
    if upstart_init_path 
      if File.exists? upstart_init_path
        puts "#{upstart_config_path} has been (over)written."
        puts "#{upstart_init_path} already exists.  It should be a symbolic link that points to #{upstart_script_path}"
        ls_command = "ls -l #{upstart_init_path}"
        # puts ls_command
        # puts `#{ls_command}`
        # puts "ln -s #{upstart_script_path} #{upstart_init_path}"
      else
        `ln -s #{upstart_script_path} #{upstart_init_path}`
      end
    end
  else
    puts upstart_conf
  end
end

#help(message = nil) ⇒ Object 



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# File 'lib/deadpool/generator.rb', line 91

def help(message=nil)
  unless message.nil?
    puts message
  end
  puts @option_parser.help
  exit 4
end

#parse_command_line ⇒ Object 



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# File 'lib/deadpool/generator.rb', line 22

def parse_command_line
options                       = Hash.new
options[:command_count]       = 0
options[:config_path]         = '/etc/deadpool'
options[:upstart_config_path] = '/etc/init/deadpool.conf'
options[:upstart_init_path]   = '/etc/init.d/deadpool'
options[:upstart_script_path] = '/lib/init/upstart-job'

@option_parser = OptionParser.new do |opts|
  opts.banner = "Usage: deadpool_generator command [options]"

  opts.separator "Commands:"
  opts.on("-h", "--help", "Print this help message.") do |help|
    options[:command_count] += 1
    options[:command]        = :help
  end
  opts.on("--upstart_init", "Generate and upstart config.") do |upstart|
    options[:command_count] += 1
    options[:command]        = :upstart_init
  end
  opts.on("--configuration", "Generate a config directory structure and example files.") do |configuration|
    options[:command_count] += 1
    options[:command]        = :configuration
  end

  opts.separator "Configuration Options:"
  opts.on("--config_path=PATH", String, "path to create the config dir at (#{options[:config_path]})") do |config_path|
    options[:config_path] = config_path
  end

  opts.separator "Upstart Options:"
  opts.on("--upstart_config_path=PATH", String, "path to create the config dir at (#{options[:upstart_config_path]})") do |upstart_config_path|
    options[:upstart_config_path] = upstart_config_path
  end
  opts.on("--upstart_init_path=PATH", String, "path to create the config dir at (#{options[:upstart_init_path]})") do |upstart_init_path|
    options[:upstart_init_path] = upstart_init_path
  end
  opts.on("--upstart_script_path=PATH", String, "path to create the config dir at (#{options[:upstart_script_path]})") do |upstart_script_path|
    options[:upstart_script_path] = upstart_script_path
    unless File.exists? upstart_script_path
      help "The upstart script is not at #{upstart_script_path}."
    end
  end
end

  remaining_arguments = @option_parser.parse! @argv

  unless remaining_arguments.empty?
    help "[#{remaining_arguments.join(' ')}] is not understood."
  end

  if options[:command_count] == 0
    help "You must specify a command."
  end

  return options
end

#run ⇒ Object 



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# File 'lib/deadpool/generator.rb', line 15

def run
  @options = self.parse_command_line
  @config  = Deadpool::Helper.configure @options

  self.execute_command(@options)
end