Module: LogStash::Retryable

Defined in:
lib/logstash/util/retryable.rb

Instance Method Summary collapse

Instance Method Details

#retryable(options = {}, &block) ⇒ Object

execute retryable code block

Parameters:

  • options (Hash) (defaults to: {}) —

    retryable options

Options Hash (options):

  • :tries (Fixnum) —

    retries to perform, default 1, set to 0 for infite retries. 1 means that upon exception the block will be retried once

  • :base_sleep (Fixnum) —

    seconds to sleep on first retry, default 1

  • :max_sleep (Fixnum) —

    max seconds to sleep upon exponential backoff, default 1

  • :rescue (Exception) —

    exception class list to retry on, defaults is Exception, which retries on any Exception.

  • :on_retry (Proc) —

    call the given Proc/lambda before each retry with the raised exception as parameter



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# File 'lib/logstash/util/retryable.rb', line 10

def retryable(options = {}, &block)
  options = {
    :tries => 1,
    :rescue => Exception,
    :on_retry => nil,
    :base_sleep => 1,
    :max_sleep => 1,
  }.merge(options)

  rescue_classes = Array(options[:rescue])
  max_sleep_retry = Math.log2(options[:max_sleep] / options[:base_sleep])
  retry_count = 0

  begin
    return yield(retry_count)
  rescue *rescue_classes => e
    raise e if options[:tries] > 0 && retry_count >= options[:tries]

    options[:on_retry].call(retry_count + 1, e) if options[:on_retry]

    # dont compute and maybe overflow exponent on too big a retry count
    seconds = retry_count < max_sleep_retry ? options[:base_sleep] * (2 ** retry_count) : options[:max_sleep]
    sleep(seconds)

    retry_count += 1
    retry
  end
end