NoMethodError: undefined method `gsub' for nil:NilClass

[lagoan]

We are getting nil values when waiting for the next item from the preservation queue. We are specifically checking for this case where the result is nil so it is odd that we are still having this problem.

2022-12-15 04:23 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-14 04:28 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-13 04:25 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-12 17:07 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-12 04:59 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-11 04:44 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-10 04:24 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 10:43 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 10:13 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 10:00 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 09:57 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 09:44 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass
2022-12-09 09:40 | chard.library.ualberta.ca | undefined method `gsub' for nil:NilClass

The offending code is here:

pushmi_pullyu/lib/pushmi_pullyu/cli.rb

Lines 184 to 189 in 2ccdc4c

	def run_preservation_cycle
	entity_json = queue.wait_next_item
	# jupiter is submitting the entries to reddis in a hash format using fat arrows. We need to change them to colons in
	# order to parse them correctly from json
	entity = JSON.parse(entity_json.gsub('=>', ':'), { symbolize_names: true })
	return unless entity[:type].present? && entity[:uuid].present?