Class: Orange::Middleware::ShowExceptions

Inherits:
Base show all
Defined in:
lib/orange-core/middleware/show_exceptions.rb

Overview

Rack::ShowExceptions catches all exceptions raised from the app it wraps. It shows a useful backtrace with the sourcefile and clickable context, the whole Rack environment and the request data.

Be careful when you use this on public-facing sites as it could reveal information helpful to attackers.

Orange::Middleware::ShowExceptions is a slightly modified version of Rack::ShowExceptions

Constant Summary collapse

CONTEXT = 
7

Instance Method Summary collapse

Methods inherited from Base

#init, #initialize, #inspect, #orange, #pass, #recapture

Constructor Details

This class inherits a constructor from Orange::Middleware::Base

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/orange-core/middleware/show_exceptions.rb', line 20

def call(env)
  @app.call(env)
rescue Exception => e
  backtrace = pretty(env, e)
  
  [500,
   {"Content-Type" => "text/html",
    "Content-Length" => backtrace.join.size.to_s},
   backtrace]
end

#h(obj) ⇒ Object

:nodoc:



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# File 'lib/orange-core/middleware/show_exceptions.rb', line 71

def h(obj)                  # :nodoc:
  case obj
  when String
    Rack::Utils.escape_html(obj)
  else
    Rack::Utils.escape_html(obj.inspect)
  end
end

#packet_call(packet) ⇒ Object 



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# File 'lib/orange-core/middleware/show_exceptions.rb', line 31

def packet_call(packet)
  backtrace = pretty()
end

#pretty(env, exception) ⇒ Object 



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# File 'lib/orange-core/middleware/show_exceptions.rb', line 35

def pretty(env, exception)
  req = Rack::Request.new(env)
  path = (req.script_name + req.path_info).squeeze("/")

  frames = exception.backtrace.map { |line|
    frame = OpenStruct.new
    if line =~ /(.*?):(\d+)(:in `(.*)')?/
      frame.filename = $1
      frame.lineno = $2.to_i
      frame.function = $4

      begin
        lineno = frame.lineno-1
        lines = ::File.readlines(frame.filename)
        frame.pre_context_lineno = [lineno-CONTEXT, 0].max
        frame.pre_context = lines[frame.pre_context_lineno...lineno]
        frame.context_line = lines[lineno].chomp
        frame.post_context_lineno = [lineno+CONTEXT, lines.size].min
        frame.post_context = lines[lineno+1..frame.post_context_lineno]
      rescue
      end

      frame
    else
      nil
    end
  }.compact

  env["rack.errors"].puts "#{exception.class}: #{exception.message}"
  env["rack.errors"].puts exception.backtrace.map { |l| "\t" + l }
  env["rack.errors"].flush
  orange_env = env["orange.env"]
  parse = orange[:parser].haml("exceptions.haml", binding, :template => true)
  [parse]
end