~singpolyma/sgx-jmp

ref: 2d687b1a39c8318d4efba9300f428f58ed4ad713 sgx-jmp/lib/expiring_lock.rb -rw-r--r-- 347 bytes
2d687b1aStephen Paul Weber Patch bandwidth-iris to raise useful exceptions 9 months ago
                                                                                
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# frozen_string_literal: true

class ExpiringLock
	def initialize(name, expiry: 60 * 60 * 24)
		@name = name
		@expiry = expiry
	end

	def with(els=nil)
		REDIS.exists(@name).then do |exists|
			next els&.call if exists == 1

			EMPromise.resolve(yield).then do |rval|
				REDIS.setex(@name, @expiry, Time.now).then { rval }
			end
		end
	end
end