Class: Failbot::Rescuer

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

Overview

Rack middleware that rescues exceptions raised from the downstream app and reports to failbot. The exception is reraised after being sent to haystack so upstream middleware can still display an error page or whathaveyou.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, other) ⇒ Rescuer

Returns a new instance of Rescuer.



6
7
8
9
 
# File 'lib/failbot/middleware.rb', line 6

def initialize(app, other)
  @app   = app
  @other = other
end

Class Method Details

.context(env) ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
 
# File 'lib/failbot/middleware.rb', line 26

def self.context(env)
  request = Rack::Request.new(env.dup)
  params = {}
  begin
    params = request.params
  rescue
    env["rack.input"].rewind
  end

  {
    :method       => request.request_method,
    :user_agent   => env['HTTP_USER_AGENT'],
    :params       => filtered_parameters(env, params),
    :session      => filtered_parameters(env, (request.session.to_hash rescue {})),
    :referrer     => request.referrer,
    :remote_ip    => request.ip,
    :url          => request.url
  }
end

.filter_parameters(filter_words, unfiltered_parameters) ⇒ Object

Borrowed from Rails.



59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/failbot/middleware.rb', line 59

def self.filter_parameters(filter_words, unfiltered_parameters)
  parameter_filter = Regexp.new(filter_words.collect{ |s| s.to_s }.join('|'), true) if filter_words.length > 0

  filtered_parameters = {}

  unfiltered_parameters.each do |key, value|
    if key =~ parameter_filter
      filtered_parameters[key] = '[FILTERED]'
    elsif value.is_a?(Hash)
      filtered_parameters[key] = filter_parameters(filter_words, value)
    elsif value.is_a?(Array)
      filtered_parameters[key] = value.collect do |item|
        case item
        when Hash, Array
          filter_parameters(filter_words, item)
        else
          item
        end
      end
    elsif block_given?
      key = key.dup
      value = value.dup if value.duplicable?
      yield key, value
      filtered_parameters[key] = value
    else
      filtered_parameters[key] = value
    end
  end

  filtered_parameters
end

.filtered_parameters(env, params) ⇒ Object 



50
51
52
53
54
55
56
 
# File 'lib/failbot/middleware.rb', line 50

def self.filtered_parameters(env, params)
  if env['filter_words']
    filter_parameters(env['filter_words'], params)
  else
    params
  end
end

.report(exception, env, other = {}) ⇒ Object 



46
47
48
 
# File 'lib/failbot/middleware.rb', line 46

def self.report(exception, env, other = {})
  Failbot.report(exception, other.merge(context(env)))
end

Instance Method Details

#call(env) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/failbot/middleware.rb', line 11

def call(env)
  Failbot.reset!
  Failbot.push @other.merge(self.class.context(env))
  begin
    start = Time.now
    @app.call(env)
  rescue Object => boom
    elapsed = Time.now - start
    Failbot.report(boom, {:time => elapsed.to_s})
    raise
  end
ensure
  Failbot.reset!
end