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. This is a subclass of the standard EOFError class and applications should not rescue it explicitly, but rescue EOFError instead.

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.



39
40
41
42
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
 
# File 'lib/unicorn.rb', line 39

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)
  if ru =~ /\.ru$/ && !defined?(Rack::Builder)
    abort "rack and Rack::Builder must be available for processing #{ru}"
  end

  # 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

    middleware = { # order matters
      ContentLength: nil,
      Chunked: nil,
      CommonLogger: [ $stderr ],
      ShowExceptions: nil,
      Lint: nil,
      TempfileReaper: nil,
    }

    # 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"
    when "deployment"
      middleware.delete(:ShowExceptions)
      middleware.delete(:Lint)
    else
      return inner_app
    end
    Rack::Builder.new do
      middleware.each do |m, args|
        use(Rack.const_get(m), *args) if Rack.const_defined?(m)
      end
      run inner_app
    end.to_app
  end
end

.listener_names ⇒ Object

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/



99
100
101
102
103
 
# File 'lib/unicorn.rb', line 99

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 



105
106
107
108
109
110
 
# File 'lib/unicorn.rb', line 105

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

.pipe ⇒ Object

remove this when we only support Ruby >= 2.0



113
114
115
 
# File 'lib/unicorn.rb', line 113

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