module Aws::RefreshingCredentials

def credentials
  refresh_if_near_expiration
  @credentials
end

def expiration
  refresh_if_near_expiration
  @expiration
end

def initialize(options = {})
  @mutex = Mutex.new
  refresh
end

def near_expiration?
  if @expiration
    # are we within 5 minutes of expiration?
    (Time.now.to_i + 5 * 60) > @expiration.to_i
  else
    true
  end
end

def refresh!
  @mutex.synchronize { refresh }
end

def refresh_if_near_expiration
  if near_expiration?
    @mutex.synchronize do
      refresh if near_expiration?
    end
  end
end