Retry failed blocks with jittered backoff

# Retry a block on transient errors with exponential backoff plus jitter.
def with_retries(attempts: 4, base: 0.1, rescues: [StandardError])
  attempt = 1
  begin
    yield
  rescue *rescues => error
    raise if attempt >= attempts

    warn "attempt #{attempt} failed: #{error.message}"
    delay = base * (2**(attempt - 1))
    sleep(delay * (0.5 + rand / 2.0))
    attempt += 1
    retry
  end
end

calls = 0
result = with_retries(attempts: 3, base: 0.01) do
  calls += 1
  raise IOError, 'temporary failure' if calls < 3
  "finished after #{calls} attempt(s)"
end

puts result