Class: Puma::DSL

Inherits:
Object
  • Object
show all
Includes:
ConfigDefault
Defined in:
lib/puma/dsl.rb

Overview

The methods that are available for use inside the configuration file. These same methods are used in Puma cli and the rack handler internally.

Used manually (via CLI class):

config = Configuration.new({}) do |user_config|
  user_config.port 3001
end
config.load

puts config.options[:binds]
"tcp://127.0.0.1:3001"

Used to load file:

$ cat puma_config.rb
  port 3002

config = Configuration.new(config_file: "puma_config.rb")
config.load

puts config.options[:binds]
# => "tcp://127.0.0.1:3002"

You can also find many examples being used by the test suite in test/config.

Constant Summary

Constants included from ConfigDefault

ConfigDefault::DefaultRackup, ConfigDefault::DefaultTCPHost, ConfigDefault::DefaultTCPPort, ConfigDefault::DefaultWorkerShutdownTimeout, ConfigDefault::DefaultWorkerTimeout

Instance Method Summary collapse

Constructor Details

#initialize(options, config) ⇒ DSL

Returns a new instance of DSL.


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# File 'lib/puma/dsl.rb', line 36

def initialize(options, config)
  @config  = config
  @options = options

  @plugins = []
end

Instance Method Details

#_load_from(path) ⇒ Object


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# File 'lib/puma/dsl.rb', line 43

def _load_from(path)
  if path
    @path = path
    instance_eval(File.read(path), path, 1)
  end
ensure
  _offer_plugins
end

#_offer_pluginsObject


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# File 'lib/puma/dsl.rb', line 52

def _offer_plugins
  @plugins.each do |o|
    if o.respond_to? :config
      @options.shift
      o.config self
    end
  end

  @plugins.clear
end

#activate_control_app(url = "auto", opts = {}) ⇒ Object

Start the Puma control rack application on url. This application can be communicated with to control the main server. Additionally, you can provide an authentication token, so all requests to the control server will need to include that token as a query parameter. This allows for simple authentication.

Check out App::Status to see what the app has available.

Examples:

activate_control_app 'unix:///var/run/pumactl.sock'
activate_control_app 'unix:///var/run/pumactl.sock', { auth_token: '12345' }
activate_control_app 'unix:///var/run/pumactl.sock', { no_token: true }

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# File 'lib/puma/dsl.rb', line 123

def activate_control_app(url="auto", opts={})
  if url == "auto"
    path = Configuration.temp_path
    @options[:control_url] = "unix://#{path}"
    @options[:control_url_temp] = path
  else
    @options[:control_url] = url
  end

  if opts[:no_token]
    # We need to use 'none' rather than :none because this value will be
    # passed on to an instance of OptionParser, which doesn't support
    # symbols as option values.
    #
    # See: https://github.com/puma/puma/issues/1193#issuecomment-305995488
    auth_token = 'none'
  else
    auth_token = opts[:auth_token]
    auth_token ||= Configuration.random_token
  end

  @options[:control_auth_token] = auth_token
  @options[:control_url_umask] = opts[:umask] if opts[:umask]
end

#after_worker_fork(&block) ⇒ Object Also known as: after_worker_boot

Note:

Cluster mode only.

Code to run in the master after a worker has been started. The worker's index is passed as an argument.

This is called everytime a worker is to be started.

Examples:

after_worker_fork do
  puts 'After worker fork...'
end

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# File 'lib/puma/dsl.rb', line 508

def after_worker_fork(&block)
  @options[:after_worker_fork] ||= []
  @options[:after_worker_fork] = block
end

#app(obj = nil, &block) ⇒ Object

Use an object or block as the rack application. This allows the configuration file to be the application itself.

Examples:

app do |env|
  body = 'Hello, World!'

  [
    200,
    {
      'Content-Type' => 'text/plain',
      'Content-Length' => body.length.to_s
    },
    [body]
  ]
end

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# File 'lib/puma/dsl.rb', line 101

def app(obj=nil, &block)
  obj ||= block

  raise "Provide either a #call'able or a block" unless obj

  @options[:app] = obj
end

#before_fork(&block) ⇒ Object

Note:

Cluster mode only.

Code to run immediately before master process forks workers (once on boot). These hooks can block if necessary to wait for background operations unknown to Puma to finish before the process terminates. This can be used to close any connections to remote servers (database, Redis, …) that were opened when preloading the code.

This can be called multiple times to add several hooks.

Examples:

before_fork do
  puts "Starting workers..."
end

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# File 'lib/puma/dsl.rb', line 446

def before_fork(&block)
  @options[:before_fork] ||= []
  @options[:before_fork] << block
end

#bind(url) ⇒ Object

Bind the server to url. “tcp://”, “unix://” and “ssl://” are the only accepted protocols. Multiple urls can be bound to, calling `bind` does not overwrite previous bindings.

The default is “tcp://0.0.0.0:9292”.

You can use query parameters within the url to specify options:

- Set the socket backlog depth with +backlog+, default is 1024.
- Set up an SSL certificate with +key+ & +cert+.
- Set whether to optimize for low latency instead of throughput with
  +low_latency+, default is to optimize for low latency. This is done
  via +Socket::TCP_NODELAY+.
- Set socket permissions with +umask+.

Examples:

Backlog depth

bind 'unix:///var/run/puma.sock?backlog=512'

SSL cert

bind 'ssl://127.0.0.1:9292?key=key.key&cert=cert.pem'

Disable optimization for low latency

bind 'tcp://0.0.0.0:9292?low_latency=false'

Socket permissions

bind 'unix:///var/run/puma.sock?umask=0111'

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# File 'lib/puma/dsl.rb', line 178

def bind(url)
  @options[:binds] ||= []
  @options[:binds] << url
end

#clean_thread_locals(which = true) ⇒ Object

Work around leaky apps that leave garbage in Thread locals across requests.


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# File 'lib/puma/dsl.rb', line 209

def clean_thread_locals(which=true)
  @options[:clean_thread_locals] = which
end

#clear_binds!Object


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# File 'lib/puma/dsl.rb', line 183

def clear_binds!
  @options[:binds] = []
end

#daemonize(which = true) ⇒ Object

Daemonize the server into the background. It's highly recommended to use this in combination with pidfile and stdout_redirect.

The default is “false”.

Examples:

daemonize
daemonize false

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# File 'lib/puma/dsl.rb', line 223

def daemonize(which=true)
  @options[:daemon] = which
end

#debugObject

Show debugging info


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# File 'lib/puma/dsl.rb', line 314

def debug
  @options[:debug] = true
end

#default_hostObject


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# File 'lib/puma/dsl.rb', line 67

def default_host
  @options[:default_host] || Configuration::DefaultTCPHost
end

#directory(dir) ⇒ Object

The directory to operate out of.

The default is the current directory.

Examples:

directory '/u/apps/lolcat'

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# File 'lib/puma/dsl.rb', line 535

def directory(dir)
  @options[:directory] = dir.to_s
end

#drain_on_shutdown(which = true) ⇒ Object

When shutting down, drain the accept socket of pending connections and process them. This loops over the accept socket until there are no more read events and then stops looking and waits for the requests to finish.


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# File 'lib/puma/dsl.rb', line 231

def drain_on_shutdown(which=true)
  @options[:drain_on_shutdown] = which
end

#early_hints(answer = true) ⇒ Object


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# File 'lib/puma/dsl.rb', line 334

def early_hints(answer=true)
  @options[:early_hints] = answer
end

#environment(environment) ⇒ Object

Set the environment in which the rack's app will run. The value must be a string.

The default is “development”.

Examples:

environment 'production'

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# File 'lib/puma/dsl.rb', line 242

def environment(environment)
  @options[:environment] = environment
end

#extra_runtime_dependencies(answer = []) ⇒ Object

When using prune_bundler, if extra runtime dependencies need to be loaded to initialize your app, then this setting can be used. This includes any Puma plugins.

Before bundler is pruned, the gem names supplied will be looked up in the bundler context and then loaded again after bundler is pruned. Only applies if prune_bundler is used.

Examples:

extra_runtime_dependencies ['gem_name_1', 'gem_name_2']
extra_runtime_dependencies ['puma_worker_killer', 'puma-heroku']

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# File 'lib/puma/dsl.rb', line 618

def extra_runtime_dependencies(answer = [])
  @options[:extra_runtime_dependencies] = Array(answer)
end

#first_data_timeout(seconds) ⇒ Object

Define how long the tcp socket stays open, if no data has been received.


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# File 'lib/puma/dsl.rb', line 203

def first_data_timeout(seconds)
  @options[:first_data_timeout] = Integer(seconds)
end

#force_shutdown_after(val = :forever) ⇒ Object

How long to wait for threads to stop when shutting them down. Defaults to :forever. Specifying :immediately will cause Puma to kill the threads immediately. Otherwise the value is the number of seconds to wait.

Puma always waits a few seconds after killing a thread for it to try to finish up it's work, even in :immediately mode.


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# File 'lib/puma/dsl.rb', line 253

def force_shutdown_after(val=:forever)
  i = case val
      when :forever
        -1
      when :immediately
        0
      else
        Integer(val)
      end

  @options[:force_shutdown_after] = i
end

#get(key, default = nil) ⇒ Object


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# File 'lib/puma/dsl.rb', line 75

def get(key,default=nil)
  @options[key.to_sym] || default
end

#inject(&blk) ⇒ Object


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# File 'lib/puma/dsl.rb', line 71

def inject(&blk)
  instance_eval(&blk)
end

#load(file) ⇒ Object

Load additional configuration from a file Files get loaded later via Configuration#load


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# File 'lib/puma/dsl.rb', line 150

def load(file)
  @options[:config_files] ||= []
  @options[:config_files] << file
end

#log_formatter(&block) ⇒ Object


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# File 'lib/puma/dsl.rb', line 351

def log_formatter(&block)
  @options[:log_formatter] = block
end

#log_requests(which = true) ⇒ Object

Enable request logging


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# File 'lib/puma/dsl.rb', line 308

def log_requests(which=true)
  @options[:log_requests] = which
end

#lowlevel_error_handler(obj = nil, &block) ⇒ Object

Use obj or block as the low level error handler. This allows the configuration file to change the default error on the server.

Examples:

lowlevel_error_handler do |err|
  [200, {}, ["error page"]]
end

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# File 'lib/puma/dsl.rb', line 567

def lowlevel_error_handler(obj=nil, &block)
  obj ||= block
  raise "Provide either a #call'able or a block" unless obj
  @options[:lowlevel_error_handler] = obj
end

#on_restart(&block) ⇒ Object

Code to run before doing a restart. This code should close log files, database connections, etc.

This can be called multiple times to add code each time.

Examples:

on_restart do
  puts 'On restart...'
end

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# File 'lib/puma/dsl.rb', line 275

def on_restart(&block)
  @options[:on_restart] ||= []
  @options[:on_restart] << block
end

#on_worker_boot(&block) ⇒ Object

Note:

Cluster mode only.

Code to run in a worker when it boots to setup the process before booting the app.

This can be called multiple times to add several hooks.

Examples:

on_worker_fork do
  puts 'Before worker fork...'
end

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# File 'lib/puma/dsl.rb', line 461

def on_worker_boot(&block)
  @options[:before_worker_boot] ||= []
  @options[:before_worker_boot] << block
end

#on_worker_fork(&block) ⇒ Object

Note:

Cluster mode only.

Code to run in the master right before a worker is started. The worker's index is passed as an argument.

This can be called multiple times to add several hooks.

Examples:

on_worker_fork do
  puts 'Before worker fork...'
end

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# File 'lib/puma/dsl.rb', line 493

def on_worker_fork(&block)
  @options[:before_worker_fork] ||= []
  @options[:before_worker_fork] << block
end

#on_worker_shutdown(&block) ⇒ Object

Note:

Cluster mode only.

Code to run immediately before a worker shuts down (after it has finished processing HTTP requests). These hooks can block if necessary to wait for background operations unknown to Puma to finish before the process terminates.

This can be called multiple times to add several hooks.

Examples:

on_worker_shutdown do
  puts 'On worker shutdown...'
end

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# File 'lib/puma/dsl.rb', line 478

def on_worker_shutdown(&block)
  @options[:before_worker_shutdown] ||= []
  @options[:before_worker_shutdown] << block
end

#out_of_band(&block) ⇒ Object

Code to run out-of-band when the worker is idle. These hooks run immediately after a request has finished processing and there are no busy threads on the worker. The worker doesn't accept new requests until this code finishes.

This hook is useful for running out-of-band garbage collection or scheduling asynchronous tasks to execute after a response.

This can be called multiple times to add several hooks.


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# File 'lib/puma/dsl.rb', line 524

def out_of_band(&block)
  @options[:out_of_band] ||= []
  @options[:out_of_band] << block
end

#persistent_timeout(seconds) ⇒ Object

Define how long persistent connections can be idle before Puma closes them.


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# File 'lib/puma/dsl.rb', line 198

def persistent_timeout(seconds)
  @options[:persistent_timeout] = Integer(seconds)
end

#pidfile(path) ⇒ Object

Store the pid of the server in the file at “path”.

Examples:

pidfile '/u/apps/lolcat/tmp/pids/puma.pid'

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# File 'lib/puma/dsl.rb', line 294

def pidfile(path)
  @options[:pidfile] = path.to_s
end

#plugin(name) ⇒ Object

Load the named plugin for use by this configuration


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# File 'lib/puma/dsl.rb', line 81

def plugin(name)
  @plugins << @config.load_plugin(name)
end

#port(port, host = nil) ⇒ Object

Define the TCP port to bind to. Use bind for more advanced options.

Examples:

port 9292

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# File 'lib/puma/dsl.rb', line 191

def port(port, host=nil)
  host ||= default_host
  bind "tcp://#{host}:#{port}"
end

#preload_app!(answer = true) ⇒ Object

Note:

Cluster mode only.

Preload the application before starting the workers; this conflicts with phased restart feature. This is off by default.

Examples:

preload_app!

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# File 'lib/puma/dsl.rb', line 556

def preload_app!(answer=true)
  @options[:preload_app] = answer
end

#prune_bundler(answer = true) ⇒ Object

Note:

This is incompatible with preload_app!.

Note:

This is only supported for RubyGems 2.2+

This option is used to allow your app and its gems to be properly reloaded when not using preload.

When set, if Puma detects that it's been invoked in the context of Bundler, it will cleanup the environment and re-run itself outside the Bundler environment, but directly using the files that Bundler has setup.

This means that Puma is now decoupled from your Bundler context and when each worker loads, it will be loading a new Bundler context and thus can float around as the release dictates.

See also: extra_runtime_dependencies


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# File 'lib/puma/dsl.rb', line 590

def prune_bundler(answer=true)
  @options[:prune_bundler] = answer
end

#queue_requests(answer = true) ⇒ Object

When set to true (the default), workers accept all requests and queue them before passing them to the handlers. When set to false, each worker process accepts exactly as many requests as it is configured to simultaneously handle.

Queueing requests generally improves performance. In some cases, such as a single threaded application, it may be better to ensure requests get balanced across workers.

Note that setting this to false disables HTTP keepalive and slow clients will occupy a handler thread while the request is being sent. A reverse proxy, such as nginx, can handle slow clients and queue requests before they reach Puma.


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# File 'lib/puma/dsl.rb', line 687

def queue_requests(answer=true)
  @options[:queue_requests] = answer
end

#quiet(which = true) ⇒ Object

Disable request logging, if this isn't used it'll be enabled by default.

Examples:

quiet

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# File 'lib/puma/dsl.rb', line 302

def quiet(which=true)
  @options[:log_requests] = !which
end

#rackup(path) ⇒ Object

Load path as a rackup file.

The default is “config.ru”.

Examples:

rackup '/u/apps/lolcat/config.ru'

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# File 'lib/puma/dsl.rb', line 324

def rackup(path)
  @options[:rackup] = path.to_s
end

#raise_exception_on_sigterm(answer = true) ⇒ Object

By default, Puma will raise SignalException when SIGTERM is received. In environments where SIGTERM is something expected, you can suppress these with this option.

This can be useful for example in Kubernetes, where rolling restart is guaranteed usually on infrastructure level.

Examples:

raise_exception_on_sigterm false

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# File 'lib/puma/dsl.rb', line 603

def raise_exception_on_sigterm(answer=true)
  @options[:raise_exception_on_sigterm] = answer
end

#restart_command(cmd) ⇒ Object

Command to use to restart Puma. This should be just how to load Puma itself (ie. 'ruby -Ilib bin/puma'), not the arguments to Puma, as those are the same as the original process.

Examples:

restart_command '/u/app/lolcat/bin/restart_puma'

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# File 'lib/puma/dsl.rb', line 286

def restart_command(cmd)
  @options[:restart_cmd] = cmd.to_s
end

#set_default_host(host) ⇒ Object


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# File 'lib/puma/dsl.rb', line 63

def set_default_host(host)
  @options[:default_host] = host
end

#set_remote_address(val = :socket) ⇒ Object

Control how the remote address of the connection is set. This is configurable because to calculate the true socket peer address a kernel syscall is required which for very fast rack handlers slows down the handling significantly.

There are 4 possible values:

  • :socket (the default) - read the peername from the socket using the

    syscall. This is the normal behavior.
    
  • :localhost - set the remote address to “127.0.0.1”

  • header: http_header - set the remote address to the value of the

    provided http header. For instance:
    `set_remote_address header: "X-Real-IP"`.
    Only the first word (as separated by spaces or comma)
    is used, allowing headers such as X-Forwarded-For
    to be used as well.
    
  • Any string - this allows you to hardcode remote address to any value

    you wish. Because Puma never uses this field anyway, it's
    format is entirely in your hands.
    

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# File 'lib/puma/dsl.rb', line 717

def set_remote_address(val=:socket)
  case val
  when :socket
    @options[:remote_address] = val
  when :localhost
    @options[:remote_address] = :value
    @options[:remote_address_value] = "127.0.0.1".freeze
  when String
    @options[:remote_address] = :value
    @options[:remote_address_value] = val
  when Hash
    if hdr = val[:header]
      @options[:remote_address] = :header
      @options[:remote_address_header] = "HTTP_" + hdr.upcase.tr("-", "_")
    else
      raise "Invalid value for set_remote_address - #{val.inspect}"
    end
  else
    raise "Invalid value for set_remote_address - #{val}"
  end
end

#shutdown_debug(val = true) ⇒ Object

When a shutdown is requested, the backtraces of all the threads will be written to $stdout. This can help figure out why shutdown is hanging.


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# File 'lib/puma/dsl.rb', line 694

def shutdown_debug(val=true)
  @options[:shutdown_debug] = val
end

#ssl_bind(host, port, opts) ⇒ Object

Instead of “bind 'ssl://127.0.0.1:9292?key=key_path&cert=cert_path'” you can also use the “ssl_bind” option.

Examples:

ssl_bind '127.0.0.1', '9292', {
  cert: path_to_cert,
  key: path_to_key,
  ssl_cipher_filter: cipher_filter, # optional
  verify_mode: verify_mode,         # default 'none'
}

For JRuby additional keys are required: keystore & keystore_pass.

ssl_bind '127.0.0.1', '9292', {
  cert: path_to_cert,
  key: path_to_key,
  ssl_cipher_filter: cipher_filter, # optional
  verify_mode: verify_mode,         # default 'none'
  keystore: path_to_keystore,
  keystore_pass: password
}

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# File 'lib/puma/dsl.rb', line 398

def ssl_bind(host, port, opts)
  verify = opts.fetch(:verify_mode, 'none').to_s
  no_tlsv1 = opts.fetch(:no_tlsv1, 'false')
  no_tlsv1_1 = opts.fetch(:no_tlsv1_1, 'false')
  ca_additions = "&ca=#{opts[:ca]}" if ['peer', 'force_peer'].include?(verify)

  if defined?(JRUBY_VERSION)
    keystore_additions = "keystore=#{opts[:keystore]}&keystore-pass=#{opts[:keystore_pass]}"
    bind "ssl://#{host}:#{port}?cert=#{opts[:cert]}&key=#{opts[:key]}&#{keystore_additions}&verify_mode=#{verify}&no_tlsv1=#{no_tlsv1}&no_tlsv1_1=#{no_tlsv1_1}#{ca_additions}"
  else
    ssl_cipher_filter = "&ssl_cipher_filter=#{opts[:ssl_cipher_filter]}" if opts[:ssl_cipher_filter]
    bind "ssl://#{host}:#{port}?cert=#{opts[:cert]}&key=#{opts[:key]}#{ssl_cipher_filter}&verify_mode=#{verify}&no_tlsv1=#{no_tlsv1}&no_tlsv1_1=#{no_tlsv1_1}#{ca_additions}"
  end
end

#state_path(path) ⇒ Object

Use path as the file to store the server info state. This is used by pumactl to query and control the server.

Examples:

state_path '/u/apps/lolcat/tmp/pids/puma.state'

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# File 'lib/puma/dsl.rb', line 418

def state_path(path)
  @options[:state] = path.to_s
end

#stdout_redirect(stdout = nil, stderr = nil, append = false) ⇒ Object

Redirect STDOUT and STDERR to files specified. The append parameter specifies whether the output is appended, the default is false.

Examples:

stdout_redirect '/app/lolcat/log/stdout', '/app/lolcat/log/stderr'
stdout_redirect '/app/lolcat/log/stdout', '/app/lolcat/log/stderr', true

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# File 'lib/puma/dsl.rb', line 345

def stdout_redirect(stdout=nil, stderr=nil, append=false)
  @options[:redirect_stdout] = stdout
  @options[:redirect_stderr] = stderr
  @options[:redirect_append] = append
end

#tag(string) ⇒ Object

Additional text to display in process listing.

If you do not specify a tag, Puma will infer it. If you do not want Puma to add a tag, use an empty string.

Examples:

tag 'app name'
tag ''

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# File 'lib/puma/dsl.rb', line 631

def tag(string)
  @options[:tag] = string.to_s
end

#tcp_modeObject

Run the app as a raw TCP app instead of an HTTP rack app.


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# File 'lib/puma/dsl.rb', line 546

def tcp_mode
  @options[:mode] = :tcp
end

#tcp_mode!Object

Run Puma in TCP mode


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# File 'lib/puma/dsl.rb', line 330

def tcp_mode!
  @options[:mode] = :tcp
end

#threads(min, max) ⇒ Object

Configure min to be the minimum number of threads to use to answer requests and max the maximum.

The default is “0, 16”.

Examples:

threads 0, 16
threads 5, 5

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# File 'lib/puma/dsl.rb', line 364

def threads(min, max)
  min = Integer(min)
  max = Integer(max)
  if min > max
    raise "The minimum (#{min}) number of threads must be less than or equal to the max (#{max})"
  end

  if max < 1
    raise "The maximum number of threads (#{max}) must be greater than 0"
  end

  @options[:min_threads] = min
  @options[:max_threads] = max
end

#worker_boot_timeout(timeout) ⇒ Object

Note:

Cluster mode only.

Change the default worker timeout for booting.

If unspecified, this defaults to the value of worker_timeout.

@example:

worker_boot_timeout 60

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# File 'lib/puma/dsl.rb', line 663

def worker_boot_timeout(timeout)
  @options[:worker_boot_timeout] = Integer(timeout)
end

#worker_directory(dir) ⇒ Object

DEPRECATED: The directory to operate out of.


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# File 'lib/puma/dsl.rb', line 540

def worker_directory(dir)
  $stderr.puts "worker_directory is deprecated. Please use `directory`"
  directory dir
end

#worker_shutdown_timeout(timeout) ⇒ Object

Note:

Cluster mode only.

Set the timeout for worker shutdown


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# File 'lib/puma/dsl.rb', line 670

def worker_shutdown_timeout(timeout)
  @options[:worker_shutdown_timeout] = Integer(timeout)
end

#worker_timeout(timeout) ⇒ Object

Note:

Cluster mode only.

Verifies that all workers have checked in to the master process within the given timeout. If not the worker process will be restarted. This is not a request timeout, it is to protect against a hung or dead process. Setting this value will not protect against slow requests.

The minimum value is 6 seconds, the default value is 60 seconds.

Examples:

worker_timeout 60

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# File 'lib/puma/dsl.rb', line 645

def worker_timeout(timeout)
  timeout = Integer(timeout)
  min = Const::WORKER_CHECK_INTERVAL

  if timeout <= min
    raise "The minimum worker_timeout must be greater than the worker reporting interval (#{min})"
  end

  @options[:worker_timeout] = timeout
end

#workers(count) ⇒ Object

Note:

Cluster mode only.

How many worker processes to run. Typically this is set to to the number of available cores.

The default is 0.


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# File 'lib/puma/dsl.rb', line 428

def workers(count)
  @options[:workers] = count.to_i
end