Module: RoundhouseUi::History

Defined in:
lib/roundhouse_ui/history.rb

Constant Summary collapse

RANGES = 
{ "7" => "1 week", "30" => "1 month", "90" => "3 months", "180" => "6 months" }.freeze
DEFAULT_DAYS = 
30
MAX_DAYS = 
180

Class Method Summary collapse

Class Method Details

.clamp(count) ⇒ Object 



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# File 'lib/roundhouse_ui/history.rb', line 42

def clamp(count) = count.to_i.clamp(1, MAX_DAYS)

.days(count = DEFAULT_DAYS, backend: RoundhouseUi.backend) ⇒ Object

Oldest first, so a chart can plot it without reversing.



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# File 'lib/roundhouse_ui/history.rb', line 33

def days(count = DEFAULT_DAYS, backend: RoundhouseUi.backend)
  return [] unless backend.respond_to?(:history) && backend.supports?(:history)

  backend.history(clamp(count))
rescue StandardError => e
  Rails.logger&.warn("[roundhouse] history unavailable: #{e.message}") if defined?(Rails)
  []
end

.typical_failure_rate(days) ⇒ Object

A baseline to compare today against. The median rather than the mean: one incident day would drag a mean up and make the following week look calm.



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# File 'lib/roundhouse_ui/history.rb', line 46

def typical_failure_rate(days)
  rates = days.reject(&:quiet?).map(&:failure_rate).sort
  return nil if rates.empty?

  mid = rates.size / 2
  rates.size.odd? ? rates[mid] : (rates[mid - 1] + rates[mid]) / 2.0
end