Class: WebConsole::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/web_console/middleware.rb

Constant Summary collapse

TEMPLATES_PATH = 
File.expand_path("../templates", __FILE__)

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/web_console/middleware.rb', line 12

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/web_console/middleware.rb', line 16

def call(env)
  app_exception = catch :app_exception do
    request = create_regular_or_whiny_request(env)
    return call_app(env) unless request.permitted?

    if id = id_for_repl_session_update(request)
      return update_repl_session(id, request)
    elsif id = id_for_repl_session_stack_frame_change(request)
      return change_stack_trace(id, request)
    end


    status, headers, body = call_app(env)

    if (session = Session.from(Thread.current)) && acceptable_content_type?(headers)
      headers["x-web-console-session-id"] = session.id
      headers["x-web-console-mount-point"] = mount_point

      template = Template.new(env, session)
      body, headers = Injector.new(body, headers).inject(template.render("index"))
    end

    [ status, headers, body ]
  end
rescue => e
  WebConsole.logger.error("\n#{e.class}: #{e}\n\tfrom #{e.backtrace.join("\n\tfrom ")}")
  raise e
ensure
  # Clean up the fiber locals after the session creation. Object#console
  # uses those to communicate the current binding or exception to the middleware.
  Thread.current[:__web_console_exception] = nil
  Thread.current[:__web_console_binding] = nil

  raise app_exception if Exception === app_exception
end