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rack-2.2.10
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rack
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Filename :
handler.rb
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# frozen_string_literal: true module Rack # *Handlers* connect web servers with Rack. # # Rack includes Handlers for Thin, WEBrick, FastCGI, CGI, SCGI # and LiteSpeed. # # Handlers usually are activated by calling <tt>MyHandler.run(myapp)</tt>. # A second optional hash can be passed to include server-specific # configuration. module Handler def self.get(server) return unless server server = server.to_s unless @handlers.include? server load_error = try_require('rack/handler', server) end if klass = @handlers[server] const_get(klass) else const_get(server, false) end rescue NameError => name_error raise load_error || name_error end # Select first available Rack handler given an `Array` of server names. # Raises `LoadError` if no handler was found. # # > pick ['thin', 'webrick'] # => Rack::Handler::WEBrick def self.pick(server_names) server_names = Array(server_names) server_names.each do |server_name| begin return get(server_name.to_s) rescue LoadError, NameError end end raise LoadError, "Couldn't find handler for: #{server_names.join(', ')}." end SERVER_NAMES = %w(puma thin falcon webrick).freeze private_constant :SERVER_NAMES def self.default # Guess. if ENV.include?("PHP_FCGI_CHILDREN") Rack::Handler::FastCGI elsif ENV.include?(REQUEST_METHOD) Rack::Handler::CGI elsif ENV.include?("RACK_HANDLER") self.get(ENV["RACK_HANDLER"]) else pick SERVER_NAMES end end # Transforms server-name constants to their canonical form as filenames, # then tries to require them but silences the LoadError if not found # # Naming convention: # # Foo # => 'foo' # FooBar # => 'foo_bar.rb' # FooBAR # => 'foobar.rb' # FOObar # => 'foobar.rb' # FOOBAR # => 'foobar.rb' # FooBarBaz # => 'foo_bar_baz.rb' def self.try_require(prefix, const_name) file = const_name.gsub(/^[A-Z]+/) { |pre| pre.downcase }. gsub(/[A-Z]+[^A-Z]/, '_\&').downcase require(::File.join(prefix, file)) nil rescue LoadError => error error end def self.register(server, klass) @handlers ||= {} @handlers[server.to_s] = klass.to_s end autoload :CGI, "rack/handler/cgi" autoload :FastCGI, "rack/handler/fastcgi" autoload :WEBrick, "rack/handler/webrick" autoload :LSWS, "rack/handler/lsws" autoload :SCGI, "rack/handler/scgi" autoload :Thin, "rack/handler/thin" register 'cgi', 'Rack::Handler::CGI' register 'fastcgi', 'Rack::Handler::FastCGI' register 'webrick', 'Rack::Handler::WEBrick' register 'lsws', 'Rack::Handler::LSWS' register 'scgi', 'Rack::Handler::SCGI' register 'thin', 'Rack::Handler::Thin' end end