Class: Promiscuous::CLI

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

Instance Method Summary collapse

Instance Method Details

#force_backend(backend) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 16

def force_backend(backend)
  Promiscuous::AMQP.disconnect
  Promiscuous::Config.backend = backend
  Promiscuous::AMQP.connect
end

#load_app(options = {}) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 141

def load_app(options={})
  if options[:require]
    require options[:require]
  else
    require 'rails'
    require File.expand_path("./config/environment.rb")
    ::Rails.application.eager_load!
  end
end

#maybe_warn_bareback(options) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 160

def maybe_warn_bareback(options)
  if options[:bareback]
    print_status "WARNING: --- BAREBACK MODE ----"
    print_status "WARNING: You are replicating without protection, you can get corrupted in no time"
    print_status "WARNING: --- BAREBACK MODE ----"
  end
end

#parse_args(args) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 84

def parse_args(args)
  options = {}

  require 'optparse'
  parser = OptionParser.new do |opts|
    opts.banner = "Usage: promiscuous [options] action"

    opts.separator ""
    opts.separator "Actions:"
    opts.separator "    publish"
    opts.separator "    subscribe"
    opts.separator ""
    opts.separator "Options:"

    opts.on "-s", "--sync", "Use a separate queue for sychronizing databases" do
      options[:personality] = :sync
    end

    opts.on "-c", "--criteria CRITERIA", "Published criteria in sync mode. e.g. Member.where(:created_at.gt => 1.day.ago)" do |criteria|
      options[:criteria] = criteria
    end

    opts.on "-b", "--bareback", "Bareback mode aka continue on error. Use with extreme caution" do
      options[:bareback] = true
    end

    opts.on "-r", "--require FILE", "File to require to load your app. Don't worry about it with rails" do |file|
      options[:require] = file
    end

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

    opts.on("-V", "--version", "Show version") do
      puts "Promiscuous #{Promiscuous::VERSION}"
      puts "License MIT"
      exit
    end
  end

  args = args.dup
  parser.parse!(args)

  options[:action] = args.shift.try(:to_sym)
  raise "Please specify an action (publish or subscribe)" unless options[:action].in? [:publish, :subscribe]

  if options[:action] == :publish && options[:personality] == :sync
    raise "Please specify a criteria" unless options[:criteria]
  else
    raise "Why are you specifying a criteria?" if options[:criteria]
  end

  options
end

#print_status(msg) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 168

def print_status(msg)
  Promiscuous.info msg
  $stderr.puts msg
end

#publish(options = {}) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 44

def publish(options={})
  replicate do
    Promiscuous::Worker.replicate(options)
    print_status "Replicating with #{Promiscuous::Publisher::Mongoid::Defer.klasses.count} publishers"
  end
end

#publish_sync(options = {}) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 58

def publish_sync(options={})
  print_status "Replicating #{options[:criteria]}..."
  criteria = eval(options[:criteria])

  bar = ProgressBar.create(:format => '%t |%b>%i| %c/%C %e', :title => 'Publishing', :total => criteria.count)
  criteria.each do |doc|
    doc.promiscuous_sync(options)
    bar.increment
  end

  print_status "Done. You may switch your subscriber worker back to regular mode, and delete the sync queues"
end

#replicate(config_options = {}, &block) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 4

def replicate(config_options={}, &block)
  require 'eventmachine'
  require 'em-synchrony'

  EM.synchrony do
    trap_signals
    Promiscuous::Loader.load_descriptors if defined?(Rails)
    force_backend :rubyamqp
    block.call
  end
end

#run ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 151

def run
  options = parse_args(ARGV)
  load_app(options)
  maybe_warn_bareback(options)

  # calls publish, publish_sync, subscribe, subscribe_sync
  __send__([options[:action], options[:personality]].compact.join('_'), options)
end

#subscribe(options = {}) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 51

def subscribe(options={})
  replicate do
    Promiscuous::Worker.replicate(options)
    print_status "Replicating with #{Promiscuous::Subscriber::AMQP.subscribers.count} subscribers"
  end
end

#subscribe_sync(options = {}) ⇒ Object 



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# File 'lib/promiscuous/cli.rb', line 71

def subscribe_sync(options={})
  replicate do
    # Create the regular queue if needed, so we don't lose messages.
    Promiscuous::AMQP.open_queue(Promiscuous::Subscriber::Worker.new.queue_bindings)

    print_status "WARNING: --- SYNC MODE ----"
    print_status "WARNING: Make sure you are not running the regular subscriber worker (it's racy)"
    print_status "WARNING: --- SYNC MODE ----"
    Promiscuous::Worker.replicate(options)
    print_status "Replicating with #{Promiscuous::Subscriber::AMQP.subscribers.count} subscribers"
  end
end

#trap_signals ⇒ Object 



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

def trap_signals
  %w(SIGTERM SIGINT).each do |signal|
    Signal.trap(signal) do
      print_status "Exiting..."
      Promiscuous::Worker.stop
      EM.stop
    end
  end

  Signal.trap 'SIGUSR2' do
    Thread.list.each do |thread|
      print_status '-' * 80
      if thread.backtrace
        print_status "Thread #{thread} #{thread['label']}"
        print_status thread.backtrace.join("\n")
      else
        print_status "Thread #{thread} #{thread['label']} -- no backtrace"
      end
    end
  end
end