Module: Unicorn

Included in:
Configurator
Defined in:
lib/unicorn.rb,
lib/unicorn/preread_input.rb

Overview

unicorn exposes very little of an user-visible API and most of its internals are subject to change. unicorn is designed to host Rack applications, so applications should be written against the Rack SPEC and not unicorn internals.

Defined Under Namespace

Modules: OobGC, Util Classes: Configurator, HttpServer, PrereadInput, StreamInput, TeeInput, Worker

Constant Summary collapse

ClientShutdown =

Raised inside TeeInput when a client closes the socket inside the application dispatch. This is always raised with an empty backtrace since there is nothing in the application stack that is responsible for client shutdowns/disconnects. This exception is visible to Rack applications unless PrereadInput middleware is loaded.

Class.new(EOFError)

Class Method Summary collapse

Class Method Details

.builder(ru, op) ⇒ Object

This returns a lambda to pass in as the app, this does not “build” the app (which we defer based on the outcome of “preload_app” in the Unicorn config). The returned lambda will be called when it is time to build the app.


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# File 'lib/unicorn.rb', line 32

def self.builder(ru, op)
  # allow Configurator to parse cli switches embedded in the ru file
  op = Unicorn::Configurator::RACKUP.merge!(:file => ru, :optparse => op)

  # Op is going to get cleared before the returned lambda is called, so
  # save this value so that it's still there when we need it:
  no_default_middleware = op[:no_default_middleware]

  # always called after config file parsing, may be called after forking
  lambda do ||
    inner_app = case ru
    when /\.ru$/
      raw = File.read(ru)
      raw.sub!(/^__END__\n.*/, '')
      eval("Rack::Builder.new {(\n#{raw}\n)}.to_app", TOPLEVEL_BINDING, ru)
    else
      require ru
      Object.const_get(File.basename(ru, '.rb').capitalize)
    end

    pp({ :inner_app => inner_app }) if $DEBUG

    return inner_app if no_default_middleware

    # return value, matches rackup defaults based on env
    # Unicorn does not support persistent connections, but Rainbows!
    # and Zbatery both do.  Users accustomed to the Rack::Server default
    # middlewares will need ContentLength/Chunked middlewares.
    case ENV["RACK_ENV"]
    when "development"
      Rack::Builder.new do
        use Rack::ContentLength
        use Rack::Chunked
        use Rack::CommonLogger, $stderr
        use Rack::ShowExceptions
        use Rack::Lint
        use Rack::TempfileReaper if Rack.const_defined?(:TempfileReaper)
        run inner_app
      end.to_app
    when "deployment"
      Rack::Builder.new do
        use Rack::ContentLength
        use Rack::Chunked
        use Rack::CommonLogger, $stderr
        use Rack::TempfileReaper if Rack.const_defined?(:TempfileReaper)
        run inner_app
      end.to_app
    else
      inner_app
    end
  end
end

.listener_namesObject

returns an array of strings representing TCP listen socket addresses and Unix domain socket paths. This is useful for use with Raindrops::Middleware under Linux: raindrops.bogomips.org/


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# File 'lib/unicorn.rb', line 88

def self.listener_names
  Unicorn::HttpServer::LISTENERS.map do |io|
    Unicorn::SocketHelper.sock_name(io)
  end + Unicorn::HttpServer::NEW_LISTENERS
end

.log_error(logger, prefix, exc) ⇒ Object


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# File 'lib/unicorn.rb', line 94

def self.log_error(logger, prefix, exc)
  message = exc.message
  message = message.dump if /[[:cntrl:]]/ =~ message
  logger.error "#{prefix}: #{message} (#{exc.class})"
  exc.backtrace.each { |line| logger.error(line) }
end

.pipeObject

remove this when we only support Ruby >= 2.0


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# File 'lib/unicorn.rb', line 102

def self.pipe # :nodoc:
  Kgio::Pipe.new.each { |io| io.close_on_exec = true }
end