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module Retriable
class ExponentialBackoff
ATTRIBUTES = [
:tries,
:base_interval,
:multiplier,
:max_interval,
:rand_factor,
].freeze
attr_accessor(*ATTRIBUTES)
def initialize(opts = {})
@tries = 3
@base_interval = 0.5
@max_interval = 60
@rand_factor = 0.5
@multiplier = 1.5
opts.each do |k, v|
raise ArgumentError, "#{k} is not a valid option" if !ATTRIBUTES.include?(k)
instance_variable_set(:"@#{k}", v)
end
end
def intervals
intervals = Array.new(tries) do |iteration|
[base_interval * multiplier**iteration, max_interval].min
end
return intervals if rand_factor.zero?
intervals.map { |i| randomize(i) }
end
private
def randomize(interval)
delta = rand_factor * interval * 1.0
min = interval - delta
max = interval + delta
rand(min..max)
end
end
end
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