# class Puma::DSL

The methods that are available for use inside the config 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"

Detailed docs can be found in `examples/config.rb`

### Public Class Methods

new(options, config) click to toggle source

    # File lib/puma/dsl.rb, line 31
    def initialize(options, config)
      @config  = config
      @options = options

      @plugins = []
    end

### Public Instance Methods

_load_from(path) click to toggle source

    # File lib/puma/dsl.rb, line 38
    def _load_from(path)
      if path
        @path = path
        instance_eval(File.read(path), path, 1)
      end
    ensure
      _offer_plugins
    end

_offer_plugins() click to toggle source

    # File lib/puma/dsl.rb, line 47
    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={}) click to toggle source

Start the Puma control rack app on `url`. This app can be communicated with to control the main server.

    # File lib/puma/dsl.rb, line 86
    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]
        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_boot(&block)
Alias for: after_worker_fork
after_worker_fork(&block) click to toggle source

*Cluster mode only* Code to run in the master after it starts a worker.

This can be called multiple times to add hooks.

    # File lib/puma/dsl.rb, line 361
    def after_worker_fork(&block)
      @options[:after_worker_fork] ||= []
      @options[:after_worker_fork] = block
    end

Also aliased as: after_worker_boot
app(obj=nil, &block) click to toggle source

Use `obj` or `block` as the Rack app. This allows a config file to be the app itself.

    # File lib/puma/dsl.rb, line 75
    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) click to toggle source

*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 hooks.

    # File lib/puma/dsl.rb, line 319
    def before_fork(&block)
      @options[:before_fork] ||= []
      @options[:before_fork] << block
    end

bind(url) click to toggle source

Adds a binding for the server to `url`. tcp://, unix://, and ssl:// are the only accepted protocols. Use query parameters within the url to specify options.

@note multiple urls can be bound to, calling `bind` does not overwrite previous bindings.

@example Explicitly the socket backlog depth (default is 1024)

    bind('unix:///var/run/puma.sock?backlog=2048')

@example Set up ssl cert

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

@example Prefer low-latency over higher throughput (via `Socket::TCP_NODELAY`)

    bind('tcp://0.0.0.0:9292?low_latency=true')

@example Set socket permissions

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

    # File lib/puma/dsl.rb, line 129
    def bind(url)
      @options[:binds] ||= []
      @options[:binds] << url
    end

clean_thread_locals(which=true) click to toggle source

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

    # File lib/puma/dsl.rb, line 161
    def clean_thread_locals(which=true)
      @options[:clean_thread_locals] = which
    end

clear_binds!() click to toggle source

    # File lib/puma/dsl.rb, line 134
    def clear_binds!
      @options[:binds] = []
    end

daemonize(which=true) click to toggle source

Daemonize the server into the background. Highly suggest that this be combined with `pidfile` and `stdout_redirect`.

    # File lib/puma/dsl.rb, line 167
    def daemonize(which=true)
      @options[:daemon] = which
    end

debug() click to toggle source

Show debugging info

    # File lib/puma/dsl.rb, line 241
    def debug
      @options[:debug] = true
    end

directory(dir) click to toggle source

The directory to operate out of.

    # File lib/puma/dsl.rb, line 369
    def directory(dir)
      @options[:directory] = dir.to_s
    end

drain_on_shutdown(which=true) click to toggle source

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.

    # File lib/puma/dsl.rb, line 175
    def drain_on_shutdown(which=true)
      @options[:drain_on_shutdown] = which
    end

early_hints(answer=true) click to toggle source

    # File lib/puma/dsl.rb, line 257
    def early_hints(answer=true)
      @options[:early_hints] = answer
    end

environment(environment) click to toggle source

Set the environment in which the Rack's app will run.

    # File lib/puma/dsl.rb, line 180
    def environment(environment)
      @options[:environment] = environment
    end

first_data_timeout(seconds) click to toggle source

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

    # File lib/puma/dsl.rb, line 154
    def first_data_timeout(seconds)
      @options[:first_data_timeout] = Integer(seconds)
    end

force_shutdown_after(val=:forever) click to toggle source

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.

    # File lib/puma/dsl.rb, line 191
    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) click to toggle source

    # File lib/puma/dsl.rb, line 62
    def get(key,default=nil)
      @options[key.to_sym] || default
    end

inject(&blk) click to toggle source

    # File lib/puma/dsl.rb, line 58
    def inject(&blk)
      instance_eval(&blk)
    end

load(file) click to toggle source

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

    # File lib/puma/dsl.rb, line 108
    def load(file)
      @options[:config_files] ||= []
      @options[:config_files] << file
    end

log_requests(which=true) click to toggle source

Enable request logging

    # File lib/puma/dsl.rb, line 235
    def log_requests(which=true)
      @options[:log_requests] = which
    end

lowlevel_error_handler(obj=nil, &block) click to toggle source

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

    # File lib/puma/dsl.rb, line 395
    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) click to toggle source

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

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

    # File lib/puma/dsl.rb, line 209
    def on_restart(&block)
      @options[:on_restart] ||= []
      @options[:on_restart] << block
    end

on_worker_boot(&block) click to toggle source

*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 hooks.

    # File lib/puma/dsl.rb, line 329
    def on_worker_boot(&block)
      @options[:before_worker_boot] ||= []
      @options[:before_worker_boot] << block
    end

on_worker_fork(&block) click to toggle source

*Cluster mode only* Code to run in the master when it is about to create the worker by forking itself.

This can be called multiple times to add hooks.

    # File lib/puma/dsl.rb, line 351
    def on_worker_fork(&block)
      @options[:before_worker_fork] ||= []
      @options[:before_worker_fork] << block
    end

on_worker_shutdown(&block) click to toggle source

*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 hooks.

    # File lib/puma/dsl.rb, line 341
    def on_worker_shutdown(&block)
      @options[:before_worker_shutdown] ||= []
      @options[:before_worker_shutdown] << block
    end

persistent_timeout(seconds) click to toggle source

Define how long persistent connections can be idle before puma closes them

    # File lib/puma/dsl.rb, line 148
    def persistent_timeout(seconds)
      @options[:persistent_timeout] = Integer(seconds)
    end

pidfile(path) click to toggle source

Store the pid of the server in the file at `path`.

    # File lib/puma/dsl.rb, line 223
    def pidfile(path)
      @options[:pidfile] = path.to_s
    end

plugin(name) click to toggle source

Load the named plugin for use by this configuration

    # File lib/puma/dsl.rb, line 68
    def plugin(name)
      @plugins << @config.load_plugin(name)
    end

port(port, host=nil) click to toggle source

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

    # File lib/puma/dsl.rb, line 140
    def port(port, host=nil)
      host ||= Configuration::DefaultTCPHost
      bind "tcp://#{host}:#{port}"
    end

preload_app!(answer=true) click to toggle source

*Cluster mode only* Preload the application before starting the workers and setting up the listen ports. This conflicts with using the phased restart feature, you can't use both.

    # File lib/puma/dsl.rb, line 388
    def preload_app!(answer=true)
      @options[:preload_app] = answer
    end

prune_bundler(answer=true) click to toggle source

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.

    # File lib/puma/dsl.rb, line 413
    def prune_bundler(answer=true)
      @options[:prune_bundler] = answer
    end

queue_requests(answer=true) click to toggle source

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.

    # File lib/puma/dsl.rb, line 453
    def queue_requests(answer=true)
      @options[:queue_requests] = answer
    end

quiet(which=true) click to toggle source

Disable request logging.

    # File lib/puma/dsl.rb, line 229
    def quiet(which=true)
      @options[:log_requests] = !which
    end

rackup(path) click to toggle source

Load `path` as a rackup file.

    # File lib/puma/dsl.rb, line 247
    def rackup(path)
      @options[:rackup] = path.to_s
    end

restart_command(cmd) click to toggle source

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.

    # File lib/puma/dsl.rb, line 218
    def restart_command(cmd)
      @options[:restart_cmd] = cmd.to_s
    end

set_remote_address(val=:socket) click to toggle source

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.

    # File lib/puma/dsl.rb, line 483
    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.gsub("-", "_")
        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) click to toggle source

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.

    # File lib/puma/dsl.rb, line 460
    def shutdown_debug(val=true)
      @options[:shutdown_debug] = val
    end

ssl_bind(host, port, opts) click to toggle source

    # File lib/puma/dsl.rb, line 286
    def ssl_bind(host, port, opts)
      verify = opts.fetch(:verify_mode, 'none')

      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}"
      else
        bind "ssl://#{host}:#{port}?cert=#{opts[:cert]}&key=#{opts[:key]}&verify_mode=#{verify}"
      end
    end

state_path(path) click to toggle source

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

    # File lib/puma/dsl.rb, line 300
    def state_path(path)
      @options[:state] = path.to_s
    end

stdout_redirect(stdout=nil, stderr=nil, append=false) click to toggle source

Redirect STDOUT and STDERR to files specified.

    # File lib/puma/dsl.rb, line 262
    def stdout_redirect(stdout=nil, stderr=nil, append=false)
      @options[:redirect_stdout] = stdout
      @options[:redirect_stderr] = stderr
      @options[:redirect_append] = append
    end

tag(string) click to toggle source

Additional text to display in process listing

    # File lib/puma/dsl.rb, line 418
    def tag(string)
      @options[:tag] = string.to_s
    end

tcp_mode() click to toggle source

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

    # File lib/puma/dsl.rb, line 380
    def tcp_mode
      @options[:mode] = :tcp
    end

tcp_mode!() click to toggle source

Run Puma in TCP mode

    # File lib/puma/dsl.rb, line 253
    def tcp_mode!
      @options[:mode] = :tcp
    end

threads(min, max) click to toggle source

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

    # File lib/puma/dsl.rb, line 271
    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) click to toggle source

*Cluster mode only* Set the timeout for workers to boot

    # File lib/puma/dsl.rb, line 431
    def worker_boot_timeout(timeout)
      @options[:worker_boot_timeout] = Integer(timeout)
    end

worker_directory(dir) click to toggle source

DEPRECATED: The directory to operate out of.

    # File lib/puma/dsl.rb, line 374
    def worker_directory(dir)
      $stderr.puts "worker_directory is deprecated. Please use `directory`"
      directory dir
    end

worker_shutdown_timeout(timeout) click to toggle source

*Cluster mode only* Set the timeout for worker shutdown

    # File lib/puma/dsl.rb, line 436
    def worker_shutdown_timeout(timeout)
      @options[:worker_shutdown_timeout] = Integer(timeout)
    end

worker_timeout(timeout) click to toggle source

*Cluster mode only* Set the timeout for workers in seconds When set the master process will terminate any workers that have not checked in within the given `timeout`. This mitigates hung processes. Default value is 60 seconds.

    # File lib/puma/dsl.rb, line 426
    def worker_timeout(timeout)
      @options[:worker_timeout] = Integer(timeout)
    end

workers(count) click to toggle source

*Cluster mode only* How many worker processes to run.

    # File lib/puma/dsl.rb, line 306
    def workers(count)
      @options[:workers] = count.to_i
    end