Add Rack::Logger.

lib/rack/contrib.rb

@@ -30,6 +30,7 @@ def self.release
  autoload :LazyConditionalGet, "rack/contrib/lazy_conditional_get"
  autoload :LighttpdScriptNameFix, "rack/contrib/lighttpd_script_name_fix"
  autoload :Locale, "rack/contrib/locale"
+ autoload :Logger, "rack/contrib/logger"
  autoload :MailExceptions, "rack/contrib/mailexceptions"
  autoload :PostBodyContentTypeParser, "rack/contrib/post_body_content_type_parser"
  autoload :ProcTitle, "rack/contrib/proctitle"

lib/rack/logger.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'logger'
+
+require 'rack/constants'
+
+module Rack
+ # Sets up rack.logger to write to rack.errors stream
+ class Logger
+ def initialize(app, level = ::Logger::INFO)
+ @app, @level = app, level
+ end
+
+ def call(env)
+ logger = ::Logger.new(env[RACK_ERRORS])
+ logger.level = @level
+
+ env[RACK_LOGGER] = logger
+ @app.call(env)
+ end
+ end
+end

test/spec_logger.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+require 'rack/logger'
+
+describe Rack::Logger do
+ app = lambda { |env|
+ log = env['rack.logger']
+ log.debug("Created logger")
+ log.info("Program started")
+ log.warn("Nothing to do!")
+
+ [200, { 'content-type' => 'text/plain' }, ["Hello, World!"]]
+ }
+
+ it "conform to Rack::Lint" do
+ errors = StringIO.new
+ a = Rack::Lint.new(Rack::Logger.new(app))
+ Rack::MockRequest.new(a).get('/', 'rack.errors' => errors)
+ errors.string.must_match(/INFO -- : Program started/)
+ errors.string.must_match(/WARN -- : Nothing to do/)
+ end
+end