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require 'result'
class RetryService
Retry = Class.new(RuntimeError)
# @param@ delays:
# An array of delays that are used to retry after a sleep of the indicated
# value in case of failed exceutions.
# Once this array is exhausted the executen fails permanently
#
# @param@ rescue_from:
# During execution all the excpetions from this array +plus RetryService::Retry+ are rescued from and
# trigger just another retry after a `sleep` as indicated above.
#
# @param@ block:
# This optional code is excuted before each retry, it is passed the result of the failed attempt, thus
# an `Exception` and the number of execution already tried.
def initialize( delays: [], rescue_from: [], &blk )
@intervals = delays
@registered_exceptions = Array(rescue_from) << Retry
@failure_callback = blk
end
# @param@ blk:
# The code to be executed it will be retried goverened by the `delay` passed into the initializer
# as described there in case it fails with one of the predefined exceptions or `RetryService::Retry`
#
# Eventually it will return a `Result` object.
def execute &blk
result = execute_protected blk
return result if result.ok?
@intervals.each_with_index do | interval, retry_count |
sleep interval
@failure_callback.try(:call, result.value, retry_count + 1)
result = execute_protected blk
return result if result.ok?
end
result
end
private
def execute_protected blk
Result.ok(blk.())
rescue Exception => e
if @registered_exceptions.any?{ |re| e.is_a? re }
Result.error(e)
else
raise
end
end
end
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