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



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
 
# File 'lib/puma/launcher.rb', line 43

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, conf)
  @binder.create_inherited_fds(ENV).each { |k| ENV.delete k }
  @binder.create_activated_fds(ENV).each { |k| ENV.delete k }

  @environment = conf.environment

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

  @config.load

  if @config.options[:bind_to_activated_sockets]
    @config.options[:binds] = @binder.synthesize_binds_from_activated_fs(
      @config.options[:binds],
      @config.options[:bind_to_activated_sockets] == 'only'
    )
  end

  @options = @config.options
  @config.clamp

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

  generate_restart_data

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

  Dir.chdir(@restart_dir)

  prune_bundler if prune_bundler?

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

  if clustered?
    @options[:logger] = @events

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

  @status = :run

  log_config if ENV['PUMA_LOG_CONFIG']
end

Instance Attribute Details

#binder ⇒ Object (readonly)

Returns the value of attribute binder.



101
102
103
 
# File 'lib/puma/launcher.rb', line 101

def binder
  @binder
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



101
102
103
 
# File 'lib/puma/launcher.rb', line 101

def config
  @config
end

#connected_ports ⇒ Object (readonly)

Return all tcp ports the launcher may be using, TCP or SSL

Version:

  • 5.0.0



203
204
205
 
# File 'lib/puma/launcher.rb', line 203

def connected_ports
  @binder.connected_ports
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



101
102
103
 
# File 'lib/puma/launcher.rb', line 101

def events
  @events
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



101
102
103
 
# File 'lib/puma/launcher.rb', line 101

def options
  @options
end

#restart_args ⇒ Object (readonly) 



208
209
210
211
212
213
214
215
 
# 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

#restart_dir ⇒ Object (readonly)

Returns the value of attribute restart_dir.



101
102
103
 
# File 'lib/puma/launcher.rb', line 101

def restart_dir
  @restart_dir
end

#thread_status ⇒ Object (readonly)

Version:

  • 5.0.0



228
229
230
231
232
233
234
235
236
237
 
# File 'lib/puma/launcher.rb', line 228

def thread_status
  Thread.list.each do |thread|
    name = "Thread: TID-#{thread.object_id.to_s(36)}"
    name += " #{thread['label']}" if thread['label']
    name += " #{thread.name}" if thread.respond_to?(:name) && thread.name
    backtrace = thread.backtrace || ["<no backtrace available>"]

    yield name, backtrace
  end
end

Instance Method Details

#close_binder_listeners ⇒ Object 



217
218
219
220
221
222
223
224
 
# File 'lib/puma/launcher.rb', line 217

def close_binder_listeners
  @runner.close_control_listeners
  @binder.close_listeners
  unless @status == :restart
    log "=== puma shutdown: #{Time.now} ==="
    log "- Goodbye!"
  end
end

#delete_pidfile ⇒ Object

Delete the configured pidfile



129
130
131
132
 
# File 'lib/puma/launcher.rb', line 129

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

#halt ⇒ Object

Begin async shutdown of the server



135
136
137
138
 
# File 'lib/puma/launcher.rb', line 135

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

#phased_restart ⇒ Object

Begin a phased restart if supported



153
154
155
156
157
158
159
 
# File 'lib/puma/launcher.rb', line 153

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



147
148
149
150
 
# File 'lib/puma/launcher.rb', line 147

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

#run ⇒ Object

Run the server. This blocks until the server is stopped



162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
 
# File 'lib/puma/launcher.rb', line 162

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
  integrate_with_systemd
  @runner.run

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

#stats ⇒ Object

Return stats about the server



104
105
106
 
# File 'lib/puma/launcher.rb', line 104

def stats
  @runner.stats
end

#stop ⇒ Object

Begin async shutdown of the server gracefully



141
142
143
144
 
# File 'lib/puma/launcher.rb', line 141

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

#write_state ⇒ Object

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



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/puma/launcher.rb', line 110

def write_state
  write_pid

  path = @options[:state]
  permission = @options[:state_permission]
  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.running_from = File.expand_path('.')

  sf.save path, permission
end