### Home Classes Methods

### In Files

- lib/phusion_passenger/loader_shared_helpers.rb

### Methods

- #about_to_abort
- #advertise_sockets
- #after_handling_requests
- #after_loading_app_code
- #before_handling_requests
- #before_loading_app_code_step1
- #before_loading_app_code_step2
- #create_socket_address
- #dump_all_information
- #dump_envvars
- #dump_ruby_environment
- #dump_system_memory_stats
- #init
- #run_load_path_setup_code
- #sanitize_spawn_options
- #to_boolean

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No matching classes.

# PhusionPassenger::LoaderSharedHelpers

Provides shared functions for loader and preloader apps.

### Public Instance Methods

about_to_abort(exception = nil) click to toggle source

To be called whenever the (pre)loader is about to abort with an error.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 42
    def about_to_abort(exception = nil)
            dump_all_information
    end

advertise_sockets(output, request_handler) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 262
    def advertise_sockets(output, request_handler)
            request_handler.server_sockets.each_pair do |name, options|
                    concurrency = PhusionPassenger.advertised_concurrency_level || options[:concurrency]
                    output.puts "!> socket: #{name};#{options[:address]};#{options[:protocol]};#{concurrency}"
            end
    end

after_handling_requests() click to toggle source

To be called after the request handler main loop is exited. This function will fire off necessary events perform necessary cleanup tasks.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 318
    def after_handling_requests
            PhusionPassenger.call_event(:stopping_worker_process)
    end

after_loading_app_code(options) click to toggle source

This method is to be called after loading the application code but before forking a worker process.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 235
    def after_loading_app_code(options)
            # Even though run_load_path_setup_code() restores the Phusion Passenger
            # load path after setting up Bundler, the app itself might also
            # remove Phusion Passenger from the load path for whatever reason,
            # so here we restore the load path again.
            if !$LOAD_PATH.include?(PhusionPassenger.ruby_libdir)
                    $LOAD_PATH.unshift(PhusionPassenger.ruby_libdir)
                    $LOAD_PATH.uniq!
            end

            # Post-install framework extensions. Possibly preceded by a call to
            # PhusionPassenger.install_framework_extensions!
            if defined?(::Rails) && !defined?(::Rails::VERSION)
                    require 'rails/version'
            end
    end

before_handling_requests(forked, options) click to toggle source

To be called before the request handler main loop is entered, but after the app startup file has been loaded. This function will fire off necessary events and perform necessary preparation tasks.

`forked` indicates whether the current worker process is forked off from an ApplicationSpawner that has preloaded the app code. `options` are the spawn options that were passed.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 276
    def before_handling_requests(forked, options)
            if forked
                    # Reseed pseudo-random number generator for security reasons.
                    srand
            end

            if options["process_title"] && !options["process_title"].empty?
                    $0 = options["process_title"] + ": " + options["app_group_name"]
            end

            if forked && options["analytics_logger"]
                    options["analytics_logger"].clear_connection
            end

            # If we were forked from a preloader process then clear or
            # re-establish ActiveRecord database connections. This prevents
            # child processes from concurrently accessing the same
            # database connection handles.
            if forked && defined?(ActiveRecord::Base)
                    if ActiveRecord::Base.respond_to?(:clear_all_connections!)
                            ActiveRecord::Base.clear_all_connections!
                    elsif ActiveRecord::Base.respond_to?(:clear_active_connections!)
                            ActiveRecord::Base.clear_active_connections!
                    elsif ActiveRecord::Base.respond_to?(:connected?) &&
                          ActiveRecord::Base.connected?
                            ActiveRecord::Base.establish_connection
                    end
            end

            # Fire off events.
            PhusionPassenger.call_event(:starting_worker_process, forked)
            if options["pool_account_username"] && options["pool_account_password_base64"]
                    password = options["pool_account_password_base64"].unpack('m').first
                    PhusionPassenger.call_event(:credentials,
                            options["pool_account_username"], password)
            else
                    PhusionPassenger.call_event(:credentials, nil, nil)
            end
    end

before_loading_app_code_step1(startup_file, options) click to toggle source

Prepare an application process using rules for the given spawn options. This method is to be called before loading the application code.

`startup_file` is the application type's startup file, e.g. "config/environment.rb" for Rails apps and "config.ru" for Rack apps. `options` are the spawn options that were given.

This function may modify `options`. The modified options are to be passed to the request handler.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 150
    def before_loading_app_code_step1(startup_file, options)
            DebugLogging.log_level = options["log_level"] if options["log_level"]

            # Instantiate the analytics logger if requested. Can be nil.
            require 'phusion_passenger/analytics_logger'
            options["analytics_logger"] = AnalyticsLogger.new_from_options(options)
    end

before_loading_app_code_step2(options) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 229
    def before_loading_app_code_step2(options)
            # Do nothing.
    end

create_socket_address(protocol, address) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 252
    def create_socket_address(protocol, address)
            if protocol == 'unix'
                    return "unix:#{address}"
            elsif protocol == 'tcp'
                    return "tcp://#{address}"
            else
                    raise ArgumentError, "Unknown protocol '#{protocol}'"
            end
    end

dump_all_information() click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 70
    def dump_all_information
            dump_ruby_environment
            dump_envvars
            dump_system_memory_stats
    end

dump_envvars() click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 119
    def dump_envvars
            if dir = ENV['PASSENGER_DEBUG_DIR']
                    File.open("#{dir}/envvars", "wb") do |f|
                            ENV.each_pair do |key, value|
                                    f.puts "#{key} = #{value}"
                            end
                    end
            end
    rescue SystemCallError
            # Don't care.
    end

dump_ruby_environment() click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 76
    def dump_ruby_environment
            if dir = ENV['PASSENGER_DEBUG_DIR']
                    File.open("#{dir}/ruby_info", "w") do |f|
                            f.puts "RUBY_VERSION = #{RUBY_VERSION}"
                            f.puts "RUBY_PLATFORM = #{RUBY_PLATFORM}"
                            f.puts "RUBY_ENGINE = #{defined?(RUBY_ENGINE) ? RUBY_ENGINE : 'nil'}"
                    end
                    File.open("#{dir}/load_path", "wb") do |f|
                            $LOAD_PATH.each do |path|
                                    f.puts path
                            end
                    end
                    File.open("#{dir}/loaded_libs", "wb") do |f|
                            $LOADED_FEATURES.each do |filename|
                                    f.puts filename
                            end
                    end

                    # We write to these files last because the 'require' calls can fail.
                    require 'rbconfig' if !defined?(RbConfig::CONFIG)
                    File.open("#{dir}/rbconfig", "wb") do |f|
                            RbConfig::CONFIG.each_pair do |key, value|
                                    f.puts "#{key} = #{value}"
                            end
                    end
                    require 'rubygems' if !defined?(Gem)
                    File.open("#{dir}/ruby_info", "a") do |f|
                            f.puts "RubyGems version = #{Gem::VERSION}"
                    end
                    File.open("#{dir}/activated_gems", "wb") do |f|
                            if Gem.respond_to?(:loaded_specs)
                                    Gem.loaded_specs.each_pair do |name, spec|
                                            f.puts "#{name} => #{spec.version}"
                                    end
                            else
                                    f.puts "Unable to query this information; incompatible RubyGems API."
                            end
                    end
            end
    rescue SystemCallError
            # Don't care.
    end

dump_system_memory_stats() click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 131
    def dump_system_memory_stats
            if dir = ENV['PASSENGER_DEBUG_DIR']
                    File.open("#{dir}/sysmemory", "wb") do |f|
                            f.write(`"#{PhusionPassenger.helper_scripts_dir}/system-memory-stats.py"`)
                    end
            end
    rescue SystemCallError
            # Don't care.
    end

init() click to toggle source

To be called by the (pre)loader as soon as possible.

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 34
    def init
            Thread.main[:name] = "Main thread"
            # We don't dump PATH info because at this point it's
            # unlikely to be changed.
            dump_ruby_environment
    end

run_load_path_setup_code(options) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 158
    def run_load_path_setup_code(options)
            # rack-preloader.rb depends on the 'rack' library, but the app
            # might want us to use a bundled version instead of a
            # gem/apt-get/yum/whatever-installed version. Therefore we must setup
            # the correct load paths before requiring 'rack'.
            #
            # The most popular tool for bundling dependencies is Bundler. Bundler
            # works as follows:
            # - If the bundle is locked then a file .bundle/environment.rb exists
            #   which will setup the load paths.
            # - If the bundle is not locked then the load paths must be set up by
            #   calling Bundler.setup.
            # - Rails 3's boot.rb automatically loads .bundle/environment.rb or
            #   calls Bundler.setup if that's not available.
            # - Other Rack apps might not have a boot.rb but we still want to setup
            #   Bundler.
            # - Some Rails 2 apps might have explicitly added Bundler support.
            #   These apps call Bundler.setup in their preinitializer.rb.
            #
            # So the strategy is as follows:

            # Our strategy might be completely unsuitable for the app or the
            # developer is using something other than Bundler, so we let the user
            # manually specify a load path setup file.
            if options["load_path_setup_file"]
                    require File.expand_path(options["load_path_setup_file"])

            # The app developer may also override our strategy with this magic file.
            elsif File.exist?('config/setup_load_paths.rb')
                    require File.expand_path('config/setup_load_paths')

            # If the Bundler lock environment file exists then load that. If it
            # exists then there's a 99.9% chance that loading it is the correct
            # thing to do.
            elsif File.exist?('.bundle/environment.rb')
                    require File.expand_path('.bundle/environment')

            # If the Bundler environment file doesn't exist then there are two
            # possibilities:
            # 1. Bundler is not used, in which case we don't have to do anything.
            # 2. Bundler *is* used, but the gems are not locked and we're supposed
            #    to call Bundler.setup.
            #
            # The existence of Gemfile indicates whether (2) is true:
            elsif File.exist?('Gemfile')
                    # In case of Rails 3, config/boot.rb already calls Bundler.setup.
                    # However older versions of Rails may not so loading boot.rb might
                    # not be the correct thing to do. To be on the safe side we
                    # call Bundler.setup ourselves; calling Bundler.setup twice is
                    # harmless. If this isn't the correct thing to do after all then
                    # there's always the load_path_setup_file option and
                    # setup_load_paths.rb.
                    require 'rubygems'
                    require 'bundler/setup'
            end

            # Bundler might remove Phusion Passenger from the load path in its zealous
            # attempt to un-require RubyGems, so here we put Phusion Passenger back
            # into the load path. This must be done before loading the app's startup
            # file because the app might require() Phusion Passenger files.
            if !$LOAD_PATH.include?(PhusionPassenger.ruby_libdir)
                    $LOAD_PATH.unshift(PhusionPassenger.ruby_libdir)
                    $LOAD_PATH.uniq!
            end

            # !!! NOTE !!!
            # If the app is using Bundler then any dependencies required past this
            # point must be specified in the Gemfile. Like ruby-debug if debugging is on...
    end

sanitize_spawn_options(options) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 50
    def sanitize_spawn_options(options)
            defaults = {
                    "app_type"         => "rack",
                    "environment"      => "production",
                    "print_exceptions" => true
            }
            options = defaults.merge(options)
            options["app_group_name"]            = options["app_root"] if !options["app_group_name"]
            options["print_exceptions"]          = to_boolean(options["print_exceptions"])
            options["analytics"]                 = to_boolean(options["analytics"])
            options["show_version_in_header"]    = to_boolean(options["show_version_in_header"])
            options["log_level"]                 = options["log_level"].to_i if options["log_level"]
            # TODO: smart spawning is not supported when using ruby-debug. We should raise an error
            # in this case.
            options["debugger"]     = to_boolean(options["debugger"])
            options["spawn_method"] = "direct" if options["debugger"]

            return options
    end

to_boolean(value) click to toggle source

    # File lib/phusion_passenger/loader_shared_helpers.rb, line 46
    def to_boolean(value)
            return !(value.nil? || value == false || value == "false")
    end

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