1 # -*- encoding: binary -*-
4 # Implements a simple DSL for configuring a \Unicorn server.
6 # See http://unicorn.bogomips.org/examples/unicorn.conf.rb and
7 # http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb
8 # example configuration files. An example config file for use with
9 # nginx is also available at
10 # http://unicorn.bogomips.org/examples/nginx.conf
12 # See the link:/TUNING.html document for more information on tuning unicorn.
13 class Unicorn::Configurator
17 attr_accessor :set, :config_file, :after_reload
19 # used to stash stuff for deferred processing of cli options in
20 # config.ru after "working_directory" is bound. Do not rely on
21 # this being around later on...
24 :host => Unicorn::Const::DEFAULT_HOST,
25 :port => Unicorn::Const::DEFAULT_PORT,
26 :set_listener => false,
27 :options => { :listeners => [] }
30 # Default settings for Unicorn
33 :logger => Logger.new($stderr),
34 :worker_processes => 1,
35 :after_fork => lambda { |server, worker|
36 server.logger.info("worker=#{worker.nr} spawned pid=#{$$}")
38 :before_fork => lambda { |server, worker|
39 server.logger.info("worker=#{worker.nr} spawning...")
41 :before_exec => lambda { |server|
42 server.logger.info("forked child re-executing...")
45 :preload_app => false,
46 :rewindable_input => true, # for Rack 2.x: (Rack::VERSION[0] <= 1),
47 :client_body_buffer_size => Unicorn::Const::MAX_BODY,
48 :trust_x_forwarded => true,
52 def initialize(defaults = {}) #:nodoc:
53 self.set = Hash.new(:unset)
54 @use_defaults = defaults.delete(:use_defaults)
55 self.config_file = defaults.delete(:config_file)
57 # after_reload is only used by unicorn_rails, unsupported otherwise
58 self.after_reload = defaults.delete(:after_reload)
60 set.merge!(DEFAULTS) if @use_defaults
61 defaults.each { |key, value| self.__send__(key, value) }
62 Hash === set[:listener_opts] or
63 set[:listener_opts] = Hash.new { |hash,key| hash[key] = {} }
64 Array === set[:listeners] or set[:listeners] = []
68 def reload(merge_defaults = true) #:nodoc:
69 if merge_defaults && @use_defaults
70 set.merge!(DEFAULTS) if @use_defaults
72 instance_eval(File.read(config_file), config_file) if config_file
76 RACKUP[:set_listener] and
77 set[:listeners] << "#{RACKUP[:host]}:#{RACKUP[:port]}"
79 # unicorn_rails creates dirs here after working_directory is bound
80 after_reload.call if after_reload
82 # working_directory binds immediately (easier error checking that way),
83 # now ensure any paths we changed are correctly set.
84 [ :pid, :stderr_path, :stdout_path ].each do |var|
85 String === (path = set[var]) or next
86 path = File.expand_path(path)
87 File.writable?(path) || File.writable?(File.dirname(path)) or \
88 raise ArgumentError, "directory for #{var}=#{path} not writable"
92 def commit!(server, options = {}) #:nodoc:
93 skip = options[:skip] || []
94 if ready_pipe = RACKUP.delete(:ready_pipe)
95 server.ready_pipe = ready_pipe
97 set.each do |key, value|
98 value == :unset and next
99 skip.include?(key) and next
100 server.__send__("#{key}=", value)
104 def [](key) # :nodoc:
108 # sets object to the +obj+ Logger-like object. The new Logger-like
109 # object must respond to the following methods:
115 # The default Logger will log its output to the path specified
116 # by +stderr_path+. If you're running Unicorn daemonized, then
117 # you must specify a path to prevent error messages from going
120 %w(debug info warn error fatal).each do |m|
121 obj.respond_to?(m) and next
122 raise ArgumentError, "logger=#{obj} does not respond to method=#{m}"
128 # sets after_fork hook to a given block. This block will be called by
129 # the worker after forking. The following is an example hook which adds
130 # a per-process listener to every worker:
132 # after_fork do |server,worker|
133 # # per-process listener ports for debugging/admin:
134 # addr = "127.0.0.1:#{9293 + worker.nr}"
136 # # the negative :tries parameter indicates we will retry forever
137 # # waiting on the existing process to exit with a 5 second :delay
138 # # Existing options for Unicorn::Configurator#listen such as
139 # # :backlog, :rcvbuf, :sndbuf are available here as well.
140 # server.listen(addr, :tries => -1, :delay => 5, :backlog => 128)
142 def after_fork(*args, &block)
143 set_hook(:after_fork, block_given? ? block : args[0])
146 # sets before_fork got be a given Proc object. This Proc
147 # object will be called by the master process before forking
149 def before_fork(*args, &block)
150 set_hook(:before_fork, block_given? ? block : args[0])
153 # sets the before_exec hook to a given Proc object. This
154 # Proc object will be called by the master process right
155 # before exec()-ing the new unicorn binary. This is useful
156 # for freeing certain OS resources that you do NOT wish to
157 # share with the reexeced child process.
158 # There is no corresponding after_exec hook (for obvious reasons).
159 def before_exec(*args, &block)
160 set_hook(:before_exec, block_given? ? block : args[0], 1)
163 # sets the timeout of worker processes to +seconds+. Workers
164 # handling the request/app.call/response cycle taking longer than
165 # this time period will be forcibly killed (via SIGKILL). This
166 # timeout is enforced by the master process itself and not subject
167 # to the scheduling limitations by the worker process. Due the
168 # low-complexity, low-overhead implementation, timeouts of less
169 # than 3.0 seconds can be considered inaccurate and unsafe.
171 # For running Unicorn behind nginx, it is recommended to set
172 # "fail_timeout=0" for in your nginx configuration like this
173 # to have nginx always retry backends that may have had workers
174 # SIGKILL-ed due to timeouts.
176 # # See http://wiki.nginx.org/NginxHttpUpstreamModule for more details
177 # # on nginx upstream configuration:
178 # upstream unicorn_backend {
179 # # for UNIX domain socket setups:
180 # server unix:/path/to/unicorn.sock fail_timeout=0;
183 # server 192.168.0.7:8080 fail_timeout=0;
184 # server 192.168.0.8:8080 fail_timeout=0;
185 # server 192.168.0.9:8080 fail_timeout=0;
188 set_int(:timeout, seconds, 3)
190 set[:timeout] = seconds > max ? max : seconds
193 # sets the current number of worker_processes to +nr+. Each worker
194 # process will serve exactly one client at a time. You can
195 # increment or decrement this value at runtime by sending SIGTTIN
196 # or SIGTTOU respectively to the master process without reloading
197 # the rest of your Unicorn configuration. See the SIGNALS document
198 # for more information.
199 def worker_processes(nr)
200 set_int(:worker_processes, nr, 1)
203 # sets listeners to the given +addresses+, replacing or augmenting the
204 # current set. This is for the global listener pool shared by all
205 # worker processes. For per-worker listeners, see the after_fork example
206 # This is for internal API use only, do not use it in your Unicorn
207 # config file. Use listen instead.
208 def listeners(addresses) # :nodoc:
209 Array === addresses or addresses = Array(addresses)
210 addresses.map! { |addr| expand_addr(addr) }
211 set[:listeners] = addresses
214 # Adds an +address+ to the existing listener set. May be specified more
215 # than once. +address+ may be an Integer port number for a TCP port, an
216 # "IP_ADDRESS:PORT" for TCP listeners or a pathname for UNIX domain sockets.
218 # listen 3000 # listen to port 3000 on all TCP interfaces
219 # listen "127.0.0.1:3000" # listen to port 3000 on the loopback interface
220 # listen "/tmp/.unicorn.sock" # listen on the given Unix domain socket
221 # listen "[::1]:3000" # listen to port 3000 on the IPv6 loopback interface
223 # The following options may be specified (but are generally not needed):
225 # [:backlog => number of clients]
227 # This is the backlog of the listen() syscall.
229 # Some operating systems allow negative values here to specify the
230 # maximum allowable value. In most cases, this number is only
231 # recommendation and there are other OS-specific tunables and
232 # variables that can affect this number. See the listen(2)
233 # syscall documentation of your OS for the exact semantics of
236 # If you are running unicorn on multiple machines, lowering this number
237 # can help your load balancer detect when a machine is overloaded
238 # and give requests to a different machine.
242 # [:rcvbuf => bytes, :sndbuf => bytes]
244 # Maximum receive and send buffer sizes (in bytes) of sockets.
246 # These correspond to the SO_RCVBUF and SO_SNDBUF settings which
247 # can be set via the setsockopt(2) syscall. Some kernels
248 # (e.g. Linux 2.4+) have intelligent auto-tuning mechanisms and
249 # there is no need (and it is sometimes detrimental) to specify them.
251 # See the socket API documentation of your operating system
252 # to determine the exact semantics of these settings and
253 # other operating system-specific knobs where they can be
256 # Defaults: operating system defaults
258 # [:tcp_nodelay => true or false]
260 # Disables Nagle's algorithm on TCP sockets if +true+.
262 # Setting this to +true+ can make streaming responses in Rails 3.1
263 # appear more quickly at the cost of slightly higher bandwidth usage.
264 # The effect of this option is most visible if nginx is not used,
265 # but nginx remains highly recommended with \Unicorn.
267 # This has no effect on UNIX sockets.
269 # Default: +true+ (Nagle's algorithm disabled) in \Unicorn,
270 # +true+ in Rainbows! This defaulted to +false+ in \Unicorn
273 # [:tcp_nopush => true or false]
275 # Enables/disables TCP_CORK in Linux or TCP_NOPUSH in FreeBSD
277 # This prevents partial TCP frames from being sent out and reduces
278 # wakeups in nginx if it is on a different machine. Since \Unicorn
279 # is only designed for applications that send the response body
280 # quickly without keepalive, sockets will always be flushed on close
283 # This has no effect on UNIX sockets.
286 # This defaulted to +true+ in \Unicorn 3.4 - 3.7
288 # [:ipv6only => true or false]
290 # This option makes IPv6-capable TCP listeners IPv6-only and unable
291 # to receive IPv4 queries on dual-stack systems. A separate IPv4-only
292 # listener is required if this is true.
294 # This option is only available for Ruby 1.9.2 and later.
296 # Enabling this option for the IPv6-only listener and having a
297 # separate IPv4 listener is recommended if you wish to support IPv6
298 # on the same TCP port. Otherwise, the value of \env[\"REMOTE_ADDR\"]
299 # will appear as an ugly IPv4-mapped-IPv6 address for IPv4 clients
300 # (e.g ":ffff:10.0.0.1" instead of just "10.0.0.1").
302 # Default: Operating-system dependent
304 # [:tries => Integer]
306 # Times to retry binding a socket if it is already in use
308 # A negative number indicates we will retry indefinitely, this is
309 # useful for migrations and upgrades when individual workers
310 # are binding to different ports.
314 # [:delay => seconds]
316 # Seconds to wait between successive +tries+
318 # Default: 0.5 seconds
322 # Sets the file mode creation mask for UNIX sockets. If specified,
323 # this is usually in octal notation.
325 # Typically UNIX domain sockets are created with more liberal
326 # file permissions than the rest of the application. By default,
327 # we create UNIX domain sockets to be readable and writable by
328 # all local users to give them the same accessibility as
329 # locally-bound TCP listeners.
331 # This has no effect on TCP listeners.
333 # Default: 0000 (world-read/writable)
335 # [:tcp_defer_accept => Integer]
337 # Defer accept() until data is ready (Linux-only)
339 # For Linux 2.6.32 and later, this is the number of retransmits to
340 # defer an accept() for if no data arrives, but the client will
341 # eventually be accepted after the specified number of retransmits
342 # regardless of whether data is ready.
344 # For Linux before 2.6.32, this is a boolean option, and
345 # accepts are _always_ deferred indefinitely if no data arrives.
346 # This is similar to <code>:accept_filter => "dataready"</code>
349 # Specifying +true+ is synonymous for the default value(s) below,
350 # and +false+ or +nil+ is synonymous for a value of zero.
352 # A value of +1+ is a good optimization for local networks
353 # and trusted clients. For Rainbows! and Zbatery users, a higher
354 # value (e.g. +60+) provides more protection against some
355 # denial-of-service attacks. There is no good reason to ever
356 # disable this with a +zero+ value when serving HTTP.
358 # Default: 1 retransmit for \Unicorn, 60 for Rainbows! 0.95.0\+
360 # [:accept_filter => String]
362 # defer accept() until data is ready (FreeBSD-only)
364 # This enables either the "dataready" or (default) "httpready"
365 # accept() filter under FreeBSD. This is intended as an
366 # optimization to reduce context switches with common GET/HEAD
367 # requests. For Rainbows! and Zbatery users, this provides
368 # some protection against certain denial-of-service attacks, too.
370 # There is no good reason to change from the default.
372 # Default: "httpready"
373 def listen(address, options = {})
374 address = expand_addr(address)
375 if String === address
376 [ :umask, :backlog, :sndbuf, :rcvbuf, :tries ].each do |key|
377 value = options[key] or next
379 raise ArgumentError, "not an integer: #{key}=#{value.inspect}"
381 [ :tcp_nodelay, :tcp_nopush, :ipv6only ].each do |key|
382 (value = options[key]).nil? and next
383 TrueClass === value || FalseClass === value or
384 raise ArgumentError, "not boolean: #{key}=#{value.inspect}"
386 unless (value = options[:delay]).nil?
388 raise ArgumentError, "not numeric: delay=#{value.inspect}"
390 set[:listener_opts][address].merge!(options)
393 set[:listeners] << address
396 # sets the +path+ for the PID file of the unicorn master process
397 def pid(path); set_path(:pid, path); end
399 # Enabling this preloads an application before forking worker
400 # processes. This allows memory savings when using a
401 # copy-on-write-friendly GC but can cause bad things to happen when
402 # resources like sockets are opened at load time by the master
403 # process and shared by multiple children. People enabling this are
404 # highly encouraged to look at the before_fork/after_fork hooks to
405 # properly close/reopen sockets. Files opened for logging do not
406 # have to be reopened as (unbuffered-in-userspace) files opened with
407 # the File::APPEND flag are written to atomically on UNIX.
409 # In addition to reloading the unicorn-specific config settings,
410 # SIGHUP will reload application code in the working
411 # directory/symlink when workers are gracefully restarted when
412 # preload_app=false (the default). As reloading the application
413 # sometimes requires RubyGems updates, +Gem.refresh+ is always
414 # called before the application is loaded (for RubyGems users).
416 # During deployments, care should _always_ be taken to ensure your
417 # applications are properly deployed and running. Using
418 # preload_app=false (the default) means you _must_ check if
419 # your application is responding properly after a deployment.
420 # Improperly deployed applications can go into a spawn loop
421 # if the application fails to load. While your children are
422 # in a spawn loop, it is is possible to fix an application
423 # by properly deploying all required code and dependencies.
424 # Using preload_app=true means any application load error will
425 # cause the master process to exit with an error.
427 def preload_app(bool)
428 set_bool(:preload_app, bool)
431 # Toggles making \env[\"rack.input\"] rewindable.
432 # Disabling rewindability can improve performance by lowering
433 # I/O and memory usage for applications that accept uploads.
434 # Keep in mind that the Rack 1.x spec requires
435 # \env[\"rack.input\"] to be rewindable, so this allows
436 # intentionally violating the current Rack 1.x spec.
438 # +rewindable_input+ defaults to +true+ when used with Rack 1.x for
439 # Rack conformance. When Rack 2.x is finalized, this will most
440 # likely default to +false+ while still conforming to the newer
441 # (less demanding) spec.
442 def rewindable_input(bool)
443 set_bool(:rewindable_input, bool)
446 # The maximum size (in +bytes+) to buffer in memory before
447 # resorting to a temporary file. Default is 112 kilobytes.
448 # This option has no effect if "rewindable_input" is set to
450 def client_body_buffer_size(bytes)
451 set_int(:client_body_buffer_size, bytes, 0)
454 # Allow redirecting $stderr to a given path. Unlike doing this from
455 # the shell, this allows the unicorn process to know the path its
456 # writing to and rotate the file if it is used for logging. The
457 # file will be opened with the File::APPEND flag and writes
458 # synchronized to the kernel (but not necessarily to _disk_) so
459 # multiple processes can safely append to it.
461 # If you are daemonizing and using the default +logger+, it is important
462 # to specify this as errors will otherwise be lost to /dev/null.
463 # Some applications/libraries may also triggering warnings that go to
464 # stderr, and they will end up here.
465 def stderr_path(path)
466 set_path(:stderr_path, path)
469 # Same as stderr_path, except for $stdout. Not many Rack applications
470 # write to $stdout, but any that do will have their output written here.
471 # It is safe to point this to the same location a stderr_path.
472 # Like stderr_path, this defaults to /dev/null when daemonized.
473 def stdout_path(path)
474 set_path(:stdout_path, path)
477 # sets the working directory for Unicorn. This ensures SIGUSR2 will
478 # start a new instance of Unicorn in this directory. This may be
479 # a symlink, a common scenario for Capistrano users. Unlike
480 # all other Unicorn configuration directives, this binds immediately
481 # for error checking and cannot be undone by unsetting it in the
482 # configuration file and reloading.
483 def working_directory(path)
484 # just let chdir raise errors
485 path = File.expand_path(path)
487 config_file[0] != ?/ &&
488 ! File.readable?("#{path}/#{config_file}")
490 "config_file=#{config_file} would not be accessible in" \
491 " working_directory=#{path}"
494 Unicorn::HttpServer::START_CTX[:cwd] = ENV["PWD"] = path
497 # Runs worker processes as the specified +user+ and +group+.
498 # The master process always stays running as the user who started it.
499 # This switch will occur after calling the after_fork hook, and only
500 # if the Worker#user method is not called in the after_fork hook
501 # +group+ is optional and will not change if unspecified.
502 def user(user, group = nil)
503 # raises ArgumentError on invalid user/group
505 Etc.getgrnam(group) if group
506 set[:user] = [ user, group ]
509 # Sets whether or not the parser will trust X-Forwarded-Proto and
510 # X-Forwarded-SSL headers and set "rack.url_scheme" to "https" accordingly.
511 # Rainbows!/Zbatery installations facing untrusted clients directly
512 # should set this to +false+. This is +true+ by default as Unicorn
513 # is designed to only sit behind trusted nginx proxies.
515 # This has never been publically documented and is subject to removal
516 # in future releases.
517 def trust_x_forwarded(bool) # :nodoc:
518 set_bool(:trust_x_forwarded, bool)
521 # expands "unix:path/to/foo" to a socket relative to the current path
522 # expands pathnames of sockets if relative to "~" or "~username"
523 # expands "*:port and ":port" to "0.0.0.0:port"
524 def expand_addr(address) #:nodoc:
525 return "0.0.0.0:#{address}" if Integer === address
526 return address unless String === address
529 when %r{\Aunix:(.*)\z}
532 File.expand_path(address)
533 when %r{\A(?:\*:)?(\d+)\z}
535 when %r{\A\[([a-fA-F0-9:]+)\]\z}, %r/\A((?:\d+\.){3}\d+)\z/
536 canonicalize_tcp($1, 80)
537 when %r{\A\[([a-fA-F0-9:]+)\]:(\d+)\z}, %r{\A(.*):(\d+)\z}
538 canonicalize_tcp($1, $2.to_i)
545 def set_int(var, n, min) #:nodoc:
546 Integer === n or raise ArgumentError, "not an integer: #{var}=#{n.inspect}"
547 n >= min or raise ArgumentError, "too low (< #{min}): #{var}=#{n.inspect}"
551 def canonicalize_tcp(addr, port)
552 packed = Socket.pack_sockaddr_in(port, addr)
553 port, addr = Socket.unpack_sockaddr_in(packed)
554 /:/ =~ addr ? "[#{addr}]:#{port}" : "#{addr}:#{port}"
557 def set_path(var, path) #:nodoc:
559 when NilClass, String
566 def set_bool(var, bool) #:nodoc:
571 raise ArgumentError, "#{var}=#{bool.inspect} not a boolean"
575 def set_hook(var, my_proc, req_arity = 2) #:nodoc:
578 arity = my_proc.arity
579 (arity == req_arity) or \
581 "#{var}=#{my_proc.inspect} has invalid arity: " \
582 "#{arity} (need #{req_arity})"
584 my_proc = DEFAULTS[var]
586 raise ArgumentError, "invalid type: #{var}=#{my_proc.inspect}"
591 # this is called _after_ working_directory is bound. This only
592 # parses the embedded switches in .ru files
593 # (for "rackup" compatibility)
594 def parse_rackup_file # :nodoc:
595 ru = RACKUP[:file] or return # we only return here in unit tests
597 # :rails means use (old) Rails autodetect
599 File.readable?('config.ru') or return
603 File.readable?(ru) or
604 raise ArgumentError, "rackup file (#{ru}) not readable"
606 # it could be a .rb file, too, we don't parse those manually
607 ru =~ /\.ru\z/ or return
609 /^#\\(.*)/ =~ File.read(ru) or return
610 RACKUP[:optparse].parse!($1.split(/\s+/))
612 if RACKUP[:daemonize]
613 # unicorn_rails wants a default pid path, (not plain 'unicorn')
616 pid('tmp/pids/unicorn.pid') if spid.nil? || spid == :unset
618 unless RACKUP[:daemonized]
619 Unicorn::Launcher.daemonize!(RACKUP[:options])
620 RACKUP[:ready_pipe] = RACKUP[:options].delete(:ready_pipe)