class Failbot::Rescuer

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.

Public Class Methods

context(env) click to toggle source
# 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) { |key, value| ... } click to toggle source

Borrowed from Rails.

# 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) click to toggle source
# 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
new(app, other) click to toggle source
# File lib/failbot/middleware.rb, line 6
def initialize(app, other)
  @app   = app
  @other = other
end
report(exception, env, other = {}) click to toggle source
# File lib/failbot/middleware.rb, line 46
def self.report(exception, env, other = {})
  Failbot.report(exception, other.merge(context(env)))
end

Public Instance Methods

call(env) click to toggle source
# 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