Utility method that retries a block until it receives some expected result, with some other nifty options

retryable.rb

# Retry the block several times, with a timeout between retries
# Options:
# times - maximum number of retries
# timeout - timeout betwen retries, in seconds
# break_on - will break the rerty loop given that result from the block
# if break_on is a lambda, it will call it with the block result and break if it returns true
# @return the block's result
def retryable(options = {}, &block)
  opts = {times:3, timeout:60, break_on:false}.merge(options)
  (1...opts[:times]).each do |i|
    res = yield i
    cond = opts[:break_on]
    return res if (cond.is_a?(Proc) ? cond.call(res) : cond == res)
    sleep opts[:timeout] 
  end
  yield opts[:times] 
end