unicorn Ruby/Rack server user+dev discussion/patches/pulls/bugs/help
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#!/this/will/be/overwritten/or/wrapped/anyways/do/not/worry/ruby
# -*- encoding: binary -*-
require 'unicorn/launcher'
require 'optparse'
require 'fileutils'

ENV['RAILS_ENV'] ||= "development"
rackup_opts = Unicorn::Configurator::RACKUP
options = rackup_opts[:options]

op = OptionParser.new("", 24, '  ') do |opts|
  cmd = File.basename($0)
  opts.banner = "Usage: #{cmd} " \
                "[ruby options] [#{cmd} options] [rackup config file]"
  opts.separator "Ruby options:"

  lineno = 1
  opts.on("-e", "--eval LINE", "evaluate a LINE of code") do |line|
    eval line, TOPLEVEL_BINDING, "-e", lineno
    lineno += 1
  end

  opts.on("-d", "--debug", "set debugging flags (set $DEBUG to true)") do
    $DEBUG = true
  end

  opts.on("-w", "--warn", "turn warnings on for your script") do
    $-w = true
  end

  opts.on("-I", "--include PATH",
          "specify $LOAD_PATH (may be used more than once)") do |path|
    $LOAD_PATH.unshift(*path.split(':'))
  end

  opts.on("-r", "--require LIBRARY",
          "require the library, before executing your script") do |library|
    require library
  end

  opts.separator "#{cmd} options:"

  # some of these switches exist for rackup command-line compatibility,

  opts.on("-o", "--host HOST",
          "listen on HOST (default: #{Unicorn::Const::DEFAULT_HOST})") do |h|
    rackup_opts[:host] = h
    rackup_opts[:set_listener] = true
  end

  opts.on("-p", "--port PORT", Integer,
          "use PORT (default: #{Unicorn::Const::DEFAULT_PORT})") do |port|
    rackup_opts[:port] = port
    rackup_opts[:set_listener] = true
  end

  opts.on("-E", "--env RAILS_ENV",
          "use RAILS_ENV for defaults (default: development)") do |e|
    ENV['RAILS_ENV'] = e
  end

  opts.on("-D", "--daemonize", "run daemonized in the background") do |d|
    rackup_opts[:daemonize] = !!d
  end

  # Unicorn-specific stuff
  opts.on("-l", "--listen {HOST:PORT|PATH}",
          "listen on HOST:PORT or PATH",
          "this may be specified multiple times",
          "(default: #{Unicorn::Const::DEFAULT_LISTEN})") do |address|
    options[:listeners] << address
  end

  opts.on("-c", "--config-file FILE", "Unicorn-specific config file") do |f|
    options[:config_file] = f
  end

  opts.on("-P PATH", "DEPRECATED") do |v|
    warn %q{Use of -P is ambiguous and discouraged}
    warn %q{Use --path or RAILS_RELATIVE_URL_ROOT instead}
    ENV['RAILS_RELATIVE_URL_ROOT'] = v
  end

  opts.on("--path PATH", "Runs Rails app mounted at a specific path.",
          "(default: /)") do |v|
    ENV['RAILS_RELATIVE_URL_ROOT'] = v
  end

  # I'm avoiding Unicorn-specific config options on the command-line.
  # IMNSHO, config options on the command-line are redundant given
  # config files and make things unnecessarily complicated with multiple
  # places to look for a config option.

  opts.separator "Common options:"

  opts.on_tail("-h", "--help", "Show this message") do
    puts opts.to_s.gsub(/^.*DEPRECATED.*$/s, '')
    exit
  end

  opts.on_tail("-v", "--version", "Show version") do
    puts "#{cmd} v#{Unicorn::Const::UNICORN_VERSION}"
    exit
  end

  opts.parse! ARGV
end

def rails_dispatcher
  if ::Rails::VERSION::MAJOR >= 3 && ::File.exist?('config/application.rb')
    if ::File.read('config/application.rb') =~ /^module\s+([\w:]+)\s*$/
      app_module = Object.const_get($1)
      begin
        result = app_module::Application
      rescue NameError
      end
    end
  end

  if result.nil? && defined?(ActionController::Dispatcher)
    result = ActionController::Dispatcher.new
  end

  result || abort("Unable to locate the application dispatcher class")
end

def rails_builder(ru, op, daemonize)
  return Unicorn.builder(ru, op) if ru

  # allow Configurator to parse cli switches embedded in the ru file
  Unicorn::Configurator::RACKUP.update(:file => :rails, :optparse => op)

  # this lambda won't run until after forking if preload_app is false
  # this runs after config file reloading
  lambda do ||
    # Rails 3 includes a config.ru, use it if we find it after
    # working_directory is bound.
    ::File.exist?('config.ru') and
      return Unicorn.builder('config.ru', op)

    # Load Rails and (possibly) the private version of Rack it bundles.
    begin
      require ::File.expand_path('config/boot')
      require ::File.expand_path('config/environment')
    rescue LoadError => err
      abort "#$0 must be run inside RAILS_ROOT: #{err.inspect}"
    end

    defined?(::Rails::VERSION::STRING) or
      abort "Rails::VERSION::STRING not defined by config/{boot,environment}"
    # it seems Rails >=2.2 support Rack, but only >=2.3 requires it
    old_rails = case ::Rails::VERSION::MAJOR
    when 0, 1 then true
    when 2 then Rails::VERSION::MINOR < 3 ? true : false
    else
      false
    end

    Rack::Builder.new do
      map_path = ENV['RAILS_RELATIVE_URL_ROOT'] || '/'
      if old_rails
        if map_path != '/'
          # patches + tests welcome, but I really cbf to deal with this
          # since all apps I've ever dealt with just use "/" ...
          warn "relative URL roots may not work for older Rails"
        end
        warn "LogTailer not available for Rails < 2.3" unless daemonize
        warn "Debugger not available" if $DEBUG
        require 'unicorn/app/old_rails'
        map(map_path) do
          use Unicorn::App::OldRails::Static
          run Unicorn::App::OldRails.new
        end
      else
        use Rails::Rack::LogTailer unless daemonize
        use Rails::Rack::Debugger if $DEBUG
        map(map_path) do
          unless defined?(ActionDispatch::Static)
            use Rails::Rack::Static
          end
          run rails_dispatcher
        end
      end
    end.to_app
  end
end

app = rails_builder(ARGV[0], op, rackup_opts[:daemonize])
op = nil

if $DEBUG
  require 'pp'
  pp({
    :unicorn_options => options,
    :app => app,
    :daemonize => rackup_opts[:daemonize],
  })
end

# ensure Rails standard tmp paths exist
options[:after_reload] = lambda do
  FileUtils.mkdir_p(%w(cache pids sessions sockets).map! { |d| "tmp/#{d}" })
end

if rackup_opts[:daemonize]
  options[:pid] = "tmp/pids/unicorn.pid"
  Unicorn::Launcher.daemonize!(options)
end
Unicorn::HttpServer.new(app, options).start.join
debug log:

solving 558dd0b ...
found 558dd0b in https://bogomips.org/unicorn-public/20190306024852.wjnigwzjmsmx4noo@dcvr/
found ea4f822 in https://bogomips.org/unicorn.git
preparing index
index prepared:
100755 ea4f822fb0556801cddd568f6b7608f5b854aa87	bin/unicorn_rails

applying [1/1] https://bogomips.org/unicorn-public/20190306024852.wjnigwzjmsmx4noo@dcvr/
diff --git a/bin/unicorn_rails b/bin/unicorn_rails
index ea4f822..558dd0b 100755

Checking patch bin/unicorn_rails...
Applied patch bin/unicorn_rails cleanly.

index at:
100755 558dd0b8af8325697e9ea89a2bacac486fd3579c	bin/unicorn_rails

unicorn Ruby/Rack server user+dev discussion/patches/pulls/bugs/help

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