Class: SongkickQueue::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/songkick_queue/cli.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ CLI

Returns a new instance of CLI.

Parameters:

  • argv (Array<String>) —

    of command line arguments



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# File 'lib/songkick_queue/cli.rb', line 9

def initialize(argv)
  @options = OpenStruct.new(
    libraries: [],
    consumers: [],
    process_name: 'songkick_queue',
  )

  parse_options(argv)
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/songkick_queue/cli.rb', line 6

def options
  @options
end

Instance Method Details

#parse_options(argv) ⇒ Object

Parse the command line arguments using OptionParser

Parameters:

  • argv (Array<String>) —

    of command line arguments



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# File 'lib/songkick_queue/cli.rb', line 22

def parse_options(argv)
  option_parser = OptionParser.new do |opts|
    opts.banner = 'Usage: songkick_queue [options]'

    opts.on('-r', '--require LIBRARY',
            'Path to require LIBRARY. Usually this will be a file that ',
            'requires some consumers') do |lib|
      options.libraries << lib
    end

    opts.on('-c', '--consumer CLASS_NAME',
            'Register consumer with CLASS_NAME') do |class_name|
      options.consumers << class_name
    end

    opts.on('-n', '--name NAME',
            'Set the process name to NAME') do |name|
      options.process_name = name
    end

    opts.on_tail("-h", "--help", "Show this message") do
      puts opts
      exit
    end
  end

  option_parser.parse!(argv)
end

#run ⇒ Object

Instantiates and runs a new Worker for the parsed options. Calling this method blocks the main Thread. See Worker#run for more info



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# File 'lib/songkick_queue/cli.rb', line 54

def run
  options.libraries.each do |lib|
    require lib
  end

  if options.consumers.empty?
    puts 'No consumers provided, exiting. Run `songkick_queue --help` for more info.'
    exit 1
  end

  consumers = options.consumers.map do |class_name|
    Object.const_get(class_name)
  end

  Worker.new(options.process_name, consumers).run
end