Class: StatsdMiddleware

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

Constant Summary collapse

STATUS_KEY = 
'api.rack.request'
DURATION_KEY = 
'api.rack.request.duration'
MODULES_APP_NAMES = 
Set.new %w[
  appeals_api
  apps_api
  claims_api
  coronavirus-research
  mobile
  openid_auth
  test_user_dashboard
  veteran_confirmation
  veteran_verification
].freeze
OTHER_APP_NAMES = 
Set.new %w[
  unknown
  undefined
].freeze
FRONT_END_APP_NAMES =

Allowlist of vets-website app names. List was generated by running ‘yarn apps` or `npm run apps` from inside the vets-website dir

Set.new %w[
  0993-edu-benefits
  0994-edu-benefits
  0996-higher-level-review
  1010cg-application-caregiver-assistance
  10182-board-appeal
  10203-edu-benefits
  1990-edu-benefits
  1990e-edu-benefits
  1990ez-edu-benefits
  1990n-edu-benefits
  1990s-edu-benefits
  1995-edu-benefits
  28-1900-chapter-31
  28-8832-planning-and-career-guidance
  526EZ-all-claims
  5490-edu-benefits
  5495-edu-benefits
  686C-674
  ask-a-question
  auth
  beta-enrollment
  burials
  check-in
  claims-status
  coe
  coronavirus-research
  coronavirus-vaccination
  covid-vaccine
  covid19screen
  dashboard
  dependents-view-dependents
  disability-my-rated-disabilities
  discharge-upgrade-instructions
  ezr
  facilities
  feedback-tool
  gi
  gi-sandbox
  hca
  letters
  login-page
  medical-copays
  messages
  my-documents
  my-health-account-validation
  order-form-2346
  pensions
  post-911-gib-status
  pre-need
  profile
  proxy-rewrite
  public-outreach-materials
  questionnaire
  questionnaire-list
  request-debt-help-form-5655
  resources-and-support
  search
  search-representative
  secure-messaging
  medical-records
  static-pages
  terms-of-use
  va-health-benefits-app
  vaos
  verify
  veteran-id-card
  veteran-representative
  view-payments
  view-representative
  virtual-agent
  yellow-ribbon
  your-debt
].freeze
SOURCE_APP_NAMES = 
FRONT_END_APP_NAMES + MODULES_APP_NAMES + OTHER_APP_NAMES

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ StatsdMiddleware

Returns a new instance of StatsdMiddleware.



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# File 'lib/statsd_middleware.rb', line 103

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/statsd_middleware.rb', line 107

def call(env)
  start_time = Time.current
  status, headers, response = @app.call(env)
  duration = (Time.current - start_time) * 1000.0

  path_parameters = env['action_dispatch.request.path_parameters']

  # When ActionDispatch middleware is not processed, as is the case when middleware
  # such as Rack::Attack halts the call chain while applying a rate limit, path
  # parameters are not parsed. In this case, we don't have a controller or action
  # for the request.
  #
  # We should never use a dynamic path to apply the tag for the instrumentation,
  # since this will permit a rogue actor to increase the number of time series
  # exported from the process and causes instability in the metrics system. Effort
  # should be taken to track known conditions carefully in alternate metrics. For
  # the case of Rack::Attack rate limits, we can track the number of 429s responses
  # based on component at the reverse proxy layer, or with instrumentation provided
  # by the Rack::Attack middleware (which performs some rudimentary path matching)

  if path_parameters
    controller = path_parameters[:controller]
    action = path_parameters[:action]
    source_app = get_source_app(env)

    instrument_statsd(status, duration, controller, action, source_app)
  end

  [status, headers, response]
end