Class: Appsignal::Rack::Utils Private

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

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Class Method Summary collapse

Class Method Details

.queue_start_from(env) ⇒ Integer, NilClass

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

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 18

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