Module: Resque::Pool::CLI

Extended by:
CLI, Logging
Includes:
Logging
Included in:
CLI
Defined in:
lib/resque/pool/cli.rb

Constant Summary

Constants included from Logging

Logging::PROCLINE_PREFIX

Instance Method Summary collapse

Methods included from Logging

app, log, log_worker, procline, reopen_logs!

Instance Method Details

#daemonize ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 79

def daemonize
  raise 'First fork failed' if (pid = fork) == -1
  exit unless pid.nil?
  Process.setsid
  raise 'Second fork failed' if (pid = fork) == -1
  exit unless pid.nil?
end

#manage_pidfile(pidfile) ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 99

def manage_pidfile(pidfile)
  return unless pidfile
  pid = Process.pid
  if File.exist? pidfile
    if process_still_running? pidfile
      raise "Pidfile already exists at #{pidfile} and process is still running."
    else
      File.delete pidfile
    end
  else
    FileUtils.mkdir_p File.dirname(pidfile)
  end
  File.open pidfile, "w" do |f|
    f.write pid
  end
  at_exit do
    if Process.pid == pid
      File.delete pidfile
    end
  end
end

#obtain_shared_lock(lock_path) ⇒ Object

Obtain a lock on a file that will be held for the lifetime of the process. This aids in concurrent daemonized deployment with process managers like upstart since multiple pools can share a lock, but not a pidfile.



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# File 'lib/resque/pool/cli.rb', line 91

def obtain_shared_lock(lock_path)
  return unless lock_path
  @lock_file = File.open(lock_path, 'w')
  unless @lock_file.flock(File::LOCK_SH)
    fail "unable to obtain shared lock on #{@lock_file}"
  end
end

#parse_options(argv = nil) ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 24

def parse_options(argv=nil)
  opts = {}
  parser = OptionParser.new do |opt|
    opt.banner = <<-EOS.gsub(/^            /, '')
      resque-pool is the best way to manage a group (pool) of resque workers

      When daemonized, stdout and stderr default to resque-pool.stdxxx.log files in
      the log directory and pidfile defaults to resque-pool.pid in the current dir.

      Usage:
         resque-pool [options]

      where [options] are:
    EOS
    opt.on('-c', '--config PATH', "Alternate path to config file") { |c| opts[:config] = c }
    opt.on('-a', '--appname NAME', "Alternate appname") { |c| opts[:appname] = c }
    opt.on("-d", '--daemon', "Run as a background daemon") {
      opts[:daemon] = true
      opts[:stdout]  ||= "log/resque-pool.stdout.log"
      opts[:stderr]  ||= "log/resque-pool.stderr.log"
      opts[:pidfile] ||= "tmp/pids/resque-pool.pid" unless opts[:no_pidfile]
    }
    opt.on("-k", '--kill-others', "Shutdown any other Resque Pools on startup") { opts[:killothers] = true }
    opt.on('-o', '--stdout FILE', "Redirect stdout to logfile") { |c| opts[:stdout] = c }
    opt.on('-e', '--stderr FILE', "Redirect stderr to logfile") { |c| opts[:stderr] = c }
    opt.on('--nosync', "Don't sync logfiles on every write") { opts[:nosync] = true }
    opt.on("-p", '--pidfile FILE', "PID file location") { |c|
      opts[:pidfile] = c
      opts[:no_pidfile] = false
    }
    opt.on('--no-pidfile', "Force no pidfile, even if daemonized") {
      opts[:pidfile] = nil
      opts[:no_pidfile] = true
    }
    opt.on('-l', '--lock FILE' "Open a shared lock on a file") { |c| opts[:lock_file] = c }
    opt.on("-H", "--hot-swap", "Set appropriate defaults to hot-swap a new pool for a running pool") {|c|
      opts[:pidfile] = nil
      opts[:no_pidfile] = true
      opts[:lock_file] ||= "tmp/resque-pool.lock"
      opts[:killothers] = true
    }
    opt.on("-E", '--environment ENVIRONMENT', "Set RAILS_ENV/RACK_ENV/RESQUE_ENV") { |c| opts[:environment] = c }
    opt.on("-s", '--spawn-delay MS', Integer, "Delay in milliseconds between spawning missing workers") { |c| opts[:spawn_delay] = c }
    opt.on('--term-graceful-wait', "On TERM signal, wait for workers to shut down gracefully") { opts[:term_graceful_wait] = true }
    opt.on('--term-graceful',      "On TERM signal, shut down workers gracefully") { opts[:term_graceful] = true }
    opt.on('--term-immediate',     "On TERM signal, shut down workers immediately (default)") { opts[:term_immediate] = true }
    opt.on('--single-process-group', "Workers remain in the same process group as the master") { opts[:single_process_group] = true }
    opt.on("-h", "--help", "Show this.") { puts opt; exit }
    opt.on("-v", "--version", "Show Version"){ puts "resque-pool #{VERSION} (c) nicholas a. evans"; exit}
  end
  parser.parse!(argv || parser.default_argv)

  opts
end

#process_still_running?(pidfile) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/resque/pool/cli.rb', line 121

def process_still_running?(pidfile)
  old_pid = open(pidfile).read.strip.to_i
  old_pid > 0 && Process.kill(0, old_pid)
rescue Errno::ESRCH
  false
rescue Errno::EPERM
  true
rescue ::Exception => e
  $stderr.puts "While checking if PID #{old_pid} is running, unexpected #{e.class}: #{e}"
  true
end

#redirect(opts) ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 133

def redirect(opts)
  $stdin.reopen  '/dev/null'        if opts[:daemon]
  # need to reopen as File, or else Resque::Pool::Logging.reopen_logs! won't work
  out = File.new(opts[:stdout], "a") if opts[:stdout] && !opts[:stdout].empty?
  err = File.new(opts[:stderr], "a") if opts[:stderr] && !opts[:stderr].empty?
  $stdout.reopen out if out
  $stderr.reopen err if err
  $stdout.sync = $stderr.sync = true unless opts[:nosync]
end

#run ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 13

def run
  opts = parse_options
  obtain_shared_lock opts[:lock_file]
  daemonize if opts[:daemon]
  manage_pidfile opts[:pidfile]
  redirect opts
  setup_environment opts
  set_pool_options opts
  start_pool
end

#set_pool_options(opts) ⇒ Object

TODO: global variables are not the best way



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# File 'lib/resque/pool/cli.rb', line 144

def set_pool_options(opts)
  if opts[:daemon]
    Resque::Pool.handle_winch = true
  end
  if opts[:term_graceful_wait]
    Resque::Pool.term_behavior = "graceful_worker_shutdown_and_wait"
  elsif opts[:term_graceful]
    Resque::Pool.term_behavior = "graceful_worker_shutdown"
  elsif ENV["TERM_CHILD"]
    log "TERM_CHILD enabled, so will user 'term-graceful-and-wait' behaviour"
    Resque::Pool.term_behavior = "graceful_worker_shutdown_and_wait"
  end
  if ENV.include?("DYNO") && !ENV["TERM_CHILD"]
    log "WARNING: Are you running on Heroku? You should probably set TERM_CHILD=1"
  end
  if opts[:spawn_delay]
    Resque::Pool.spawn_delay = opts[:spawn_delay] * 0.001
  end
  Resque::Pool.kill_other_pools = !!opts[:killothers]
end

#setup_environment(opts) ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 165

def setup_environment(opts)
  Resque::Pool.app_name = opts[:appname]    if opts[:appname]
  ENV["RACK_ENV"] = ENV["RAILS_ENV"] = ENV["RESQUE_ENV"] = opts[:environment] if opts[:environment]
  Resque::Pool.log "Resque Pool running in #{ENV["RAILS_ENV"] || "development"} environment"
  ENV["RESQUE_POOL_CONFIG"] = opts[:config] if opts[:config]
  Resque::Pool.single_process_group = opts[:single_process_group]
end

#start_pool ⇒ Object 



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# File 'lib/resque/pool/cli.rb', line 173

def start_pool
  require 'rake'
  self.const_set :RakeApp, Class.new(Rake::Application) {
    def default_task_name # :nodoc:
      "resque:pool"
    end
  }
  Rake.application = RakeApp.new
  require 'resque/pool/tasks'

  Rake.application.init
  Rake.application.load_rakefile
  Rake.application["resque:pool"].invoke
end