Class: Appsignal::Rack::Utils

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

Class Method Summary collapse

Class Method Details

.queue_start_from(env) ⇒ Integer, NilClass

Fetch the queue start time from the request environment.

Parameters:

  • env (Hash) —

    Request environment hash.

Returns:

  • (Integer, NilClass)

Since:

  • 3.11.0



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# File 'lib/appsignal/rack.rb', line 55

def self.queue_start_from(env)
  return unless env

  env_var = env["HTTP_X_QUEUE_START"] || env["HTTP_X_REQUEST_START"]
  return unless env_var

  cleaned_value = env_var.tr("^0-9", "")
  return if cleaned_value.empty?

  value = cleaned_value.to_i
  if value > 4_102_441_200_000
    # Value is in microseconds. Transform to milliseconds.
    value / 1_000
  elsif value < 946_681_200_000
    # Value is too low to be plausible
    nil
  else
    # Value is in milliseconds
    value
  end
end

.request_method_from(request) ⇒ String, NilClass

Fetch the HTTP request method from the request.

The request class is configurable, so reading the method can raise. Log and return nil in that case, leaving it to the caller to skip whatever it needed the method for.

Parameters:

  • request (Rack::Request) —

    Request object.

Returns:

  • (String, NilClass) 


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# File 'lib/appsignal/rack.rb', line 22

def self.request_method_from(request)
  request.request_method
rescue => error
  Appsignal.internal_logger.error(
    "Exception while fetching the HTTP request method: #{error.class}: #{error}"
  )
  nil
end

.request_value_from(request, name) ⇒ Object, NilClass

Fetch a value that describes the request, named after the method that reads it.

The request class is configurable, so reading from the request can raise. Log and return nil in that case, leaving it to the caller to skip whatever it needed the value for.

Parameters:

  • request (Rack::Request) —

    Request object.

  • name (Symbol) —

    Name of the method that reads the value.

Returns:



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# File 'lib/appsignal/rack.rb', line 41

def self.request_value_from(request, name)
  request.public_send(name)
rescue => error
  Appsignal.internal_logger.error(
    "Exception while fetching the HTTP request #{name}: #{error.class}: #{error}"
  )
  nil
end