# Copyright, 2014, by Samuel G. D. Williams. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. require_relative 'middleware' require 'trenni/strings' module Utopia class ExceptionHandler def initialize(app, location) @app = app @location = location end def fatal_error(env, exception) body = StringIO.new body.puts "Fatal Error" body.puts "

Fatal Error

" body.puts "

While requesting resource #{Trenni::Strings::to_html env['PATH_INFO']}, a fatal error occurred.

" body.puts "

#{Trenni::Strings::to_html exception.class.name}: #{Trenni::Strings::to_html exception.to_s}

" body.puts "

There is nothing more we can do to fix the problem at this point.

" body.puts "

We apologize for the inconvenience.

" body.puts "" body.rewind return [400, {"Content-Type" => "text/html"}, body] end def redirect(env, exception) return @app.call(env.merge('PATH_INFO' => @location, 'REQUEST_METHOD' => 'GET')) end def call(env) begin return @app.call(env) rescue Exception => exception # An error has occurred, log it: log = ::Logger.new(env['rack.errors'] || $stderr) log.error "Exception #{exception.to_s.dump}!" exception.backtrace.each do |line| log.error line end # If the error occurred while accessing the error handler, we finish with a fatal error: if env['PATH_INFO'] == @location return fatal_error(env, exception) else # If redirection fails, we also finish with a fatal error: begin return redirect(env, exception) rescue return fatal_error(env, exception) end end end end end end