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.



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

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

Class Method Details

.context(env) ⇒ Object 



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# File 'lib/failbot/middleware.rb', line 25

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.



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# File 'lib/failbot/middleware.rb', line 58

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 



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# File 'lib/failbot/middleware.rb', line 49

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 



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# File 'lib/failbot/middleware.rb', line 45

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

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/failbot/middleware.rb', line 11

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