class FakeRedis::ExpiringHash

def [](key)
  key = normalize key
  delete(key) if expired?(key)
  super
end

def []=(key, val)
  key = normalize key
  expire(key)
  super
end

def delete(key)
  key = normalize key
  expire(key)
  super
end

def expire(key)
  key = normalize key
  expires.delete(key)
end

def expired?(key)
  key = normalize key
  expires.include?(key) && expires[key] <= Time.now
end

def initialize(*)
  super
  @expires = {}
end

def key?(key)
  key = normalize key
  delete(key) if expired?(key)
  super
end

def keys
  super.select do |key|
    key = normalize(key)
    if expired?(key)
      delete(key)
      false
    else
      true
    end
  end
end

def normalize key
  key.to_s
end

def values_at(*keys)
  keys = keys.map { |key| normalize(key) }
  keys.each { |key| delete(key) if expired?(key) }
  super
end