Class: Pliny::Middleware::RequestID

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

Constant Summary collapse

UUID_PATTERN =

note that this pattern supports either a full UUID, or a “squashed” UUID like the kind Hermes sends:

full:     01234567-89ab-cdef-0123-456789abcdef
squashed: 0123456789abcdef0123456789abcdef

/\A[a-f0-9]{8}-?[a-f0-9]{4}-?[a-f0-9]{4}-?[a-f0-9]{4}-?[a-f0-9]{12}\Z/

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ RequestID

Returns a new instance of RequestID.



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# File 'lib/pliny/middleware/request_id.rb', line 14

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/pliny/middleware/request_id.rb', line 18

def call(env)
  request_ids = [SecureRandom.uuid] + extract_request_ids(env)

  # make ID of the request accessible to consumers down the stack
  env["REQUEST_ID"] = request_ids[0]

  # Extract request IDs from incoming headers as well. Can be used for
  # identifying a request across a number of components in SOA.
  env["REQUEST_IDS"] = request_ids

  status, headers, response = @app.call(env)

  # tag all responses with a request ID
  headers["Request-Id"] = request_ids[0]

  [status, headers, response]
end