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module Moneta
# This mixin handles the calculation of expiration times.
#
#
module ExpiresSupport
protected
# Calculates the time when something will expire.
#
# This method considers false and 0 as "no-expire" and every positive
# number as a time to live in seconds.
#
# @param [Hash] options Options hash
# @option options [0,false,nil,Numeric] :expires expires value given by user
# @param [0,false,nil,Numeric] default default expiration time
#
# @return [false] if it should not expire
# @return [Time] the time when something should expire
# @return [nil] if it is not known
def expires_at(options, default = config.expires)
value = expires_value(options, default)
Numeric === value ? Time.now + value : value
end
# Calculates the number of seconds something should last.
#
# This method considers false and 0 as "no-expire" and every positive
# number as a time to live in seconds.
#
# @param [Hash] options Options hash
# @option options [0,false,nil,Numeric] :expires expires value given by user
# @param [0,false,nil,Numeric] default default expiration time
#
# @return [false] if it should not expire
# @return [Numeric] seconds until expiration
# @return [nil] if it is not known
def expires_value(options, default = config.expires)
case value = options[:expires]
when 0, false
false
when nil
default ? default.to_r : nil
when Numeric
value = value.to_r
raise ArgumentError, ":expires must be a positive value, got #{value}" if value < 0
value
else
raise ArgumentError, ":expires must be Numeric or false, got #{value.inspect}"
end
end
class << self
def included(base)
base.supports(:expires) if base.respond_to?(:supports)
base.config :expires
end
end
end
end
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