Class: Puma::Launcher

Inherits:
Object
  • Object
show all
Defined in:
lib/puma/launcher.rb

Overview

Puma::Launcher is the single entry point for starting a Puma server based on user configuration. It is responsible for taking user supplied arguments and resolving them with configuration in ‘config/puma.rb` or `config/puma/<env>.rb`.

It is responsible for either launching a cluster of Puma workers or a single puma server.

Constant Summary collapse

KEYS_NOT_TO_PERSIST_IN_STATE = 
[
  :logger, :lowlevel_error_handler,
  :before_worker_shutdown, :before_worker_boot, :before_worker_fork,
  :after_worker_boot, :before_fork, :on_restart
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(conf, launcher_args = {}) ⇒ Launcher

Returns an instance of Launcher

conf A Puma::Configuration object indicating how to run the server.

launcher_args A Hash that currently has one required key ‘:events`, this is expected to hold an object similar to an `Puma::Events.stdio`, this object will be responsible for broadcasting Puma’s internal state to a logging destination. An optional key ‘:argv` can be supplied, this should be an array of strings, these arguments are re-used when restarting the puma server.

Examples:

conf = Puma::Configuration.new do |user_config|
  user_config.threads 1, 10
  user_config.app do |env|
    [200, {}, ["hello world"]]
  end
end
Puma::Launcher.new(conf, events: Puma::Events.stdio).run



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# File 'lib/puma/launcher.rb', line 46

def initialize(conf, launcher_args={})
  @runner        = nil
  @events        = launcher_args[:events] || Events::DEFAULT
  @argv          = launcher_args[:argv] || []
  @original_argv = @argv.dup
  @config        = conf

  @binder        = Binder.new(@events)
  @binder.import_from_env

  @environment = conf.environment

  # Advertise the Configuration
  Puma.cli_config = @config if defined?(Puma.cli_config)

  @config.load

  @options = @config.options
  @config.clamp

  generate_restart_data

  if clustered? && !Process.respond_to?(:fork)
    unsupported "worker mode not supported on #{RUBY_ENGINE} on this platform"
  end

  if @options[:daemon] && Puma.windows?
    unsupported 'daemon mode not supported on Windows'
  end

  Dir.chdir(@restart_dir)

  prune_bundler if prune_bundler?

  @environment = @options[:environment] if @options[:environment]
  set_rack_environment

  if clustered?
    @events.formatter = Events::PidFormatter.new
    @options[:logger] = @events

    @runner = Cluster.new(self, @events)
  else
    @runner = Single.new(self, @events)
  end
  Puma.stats_object = @runner

  @status = :run
end

Instance Attribute Details

#binder ⇒ Object (readonly)

Returns the value of attribute binder.



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# File 'lib/puma/launcher.rb', line 96

def binder
  @binder
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/puma/launcher.rb', line 96

def config
  @config
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/puma/launcher.rb', line 96

def events
  @events
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/puma/launcher.rb', line 96

def options
  @options
end

#restart_dir ⇒ Object (readonly)

Returns the value of attribute restart_dir.



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# File 'lib/puma/launcher.rb', line 96

def restart_dir
  @restart_dir
end

Instance Method Details

#connected_port ⇒ Object

Return which tcp port the launcher is using, if it’s using TCP



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# File 'lib/puma/launcher.rb', line 204

def connected_port
  @binder.connected_port
end

#delete_pidfile ⇒ Object

Delete the configured pidfile



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# File 'lib/puma/launcher.rb', line 122

def delete_pidfile
  path = @options[:pidfile]
  File.unlink(path) if path && File.exist?(path)
end

#halt ⇒ Object

Begin async shutdown of the server



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# File 'lib/puma/launcher.rb', line 141

def halt
  @status = :halt
  @runner.halt
end

#phased_restart ⇒ Object

Begin a phased restart if supported



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# File 'lib/puma/launcher.rb', line 159

def phased_restart
  unless @runner.respond_to?(:phased_restart) and @runner.phased_restart
    log "* phased-restart called but not available, restarting normally."
    return restart
  end
  true
end

#restart ⇒ Object

Begin async restart of the server



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# File 'lib/puma/launcher.rb', line 153

def restart
  @status = :restart
  @runner.restart
end

#restart_args ⇒ Object 



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# File 'lib/puma/launcher.rb', line 208

def restart_args
  cmd = @options[:restart_cmd]
  if cmd
    cmd.split(' ') + @original_argv
  else
    @restart_argv
  end
end

#run ⇒ Object

Run the server. This blocks until the server is stopped



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# File 'lib/puma/launcher.rb', line 168

def run
  previous_env =
    if defined?(Bundler)
      env = Bundler::ORIGINAL_ENV.dup
      # add -rbundler/setup so we load from Gemfile when restarting
      bundle = "-rbundler/setup"
      env["RUBYOPT"] = [env["RUBYOPT"], bundle].join(" ").lstrip unless env["RUBYOPT"].to_s.include?(bundle)
      env
    else
      ENV.to_h
    end

  @config.clamp

  @config.plugins.fire_starts self

  setup_signals
  set_process_title
  @runner.run

  case @status
  when :halt
    log "* Stopping immediately!"
  when :run, :stop
    graceful_stop
  when :restart
    log "* Restarting..."
    ENV.replace(previous_env)
    @runner.before_restart
    restart!
  when :exit
    # nothing
  end
end

#stats ⇒ Object

Return stats about the server



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# File 'lib/puma/launcher.rb', line 99

def stats
  @runner.stats
end

#stop ⇒ Object

Begin async shutdown of the server gracefully



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# File 'lib/puma/launcher.rb', line 147

def stop
  @status = :stop
  @runner.stop
end

#write_pid ⇒ Object

If configured, write the pid of the current process out to a file.



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# File 'lib/puma/launcher.rb', line 129

def write_pid
  path = @options[:pidfile]
  return unless path

  File.open(path, 'w') { |f| f.puts Process.pid }
  cur = Process.pid
  at_exit do
    delete_pidfile if cur == Process.pid
  end
end

#write_state ⇒ Object

Write a state file that can be used by pumactl to control the server



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# File 'lib/puma/launcher.rb', line 105

def write_state
  write_pid

  path = @options[:state]
  return unless path

  require 'puma/state_file'

  sf = StateFile.new
  sf.pid = Process.pid
  sf.control_url = @options[:control_url]
  sf.control_auth_token = @options[:control_auth_token]

  sf.save path
end