lua.go

package limiter

const ResetScript = `	
	local routeKey = KEYS[1]
	local staticKey = KEYS[2]
	local routeDeadline = ARGV[1]

	redis.call('HSET', staticKey, "Count", 1)
	redis.call('HSET', routeKey, "Count", 1, "Deadline", routeDeadline)
	return 0
`

const Script = `
	local result = {}
	local routeKey = KEYS[1]
	local staticKey = KEYS[2]

	local routeLimit = tonumber(ARGV[1])
	local staticLimit = tonumber(ARGV[2])
	local routeDeadline = tonumber(ARGV[3]) -- 如果過期或者初次造訪 要更新的時間
	local now = tonumber(ARGV[4])

	local staticCount = redis.call('HGET', staticKey, "Count")

	-- First time visit
	if not staticCount then 
		redis.call('HSET', staticKey, "Count", 1)
		redis.call('HSET', routeKey, "Count", 1, "Deadline", routeDeadline)
		result[1] = staticLimit - 1
		result[2] = routeLimit - 1
		result[3] = routeDeadline 
		return result
	end 

	local routeInfo = redis.call('HGETALL', routeKey)

	if #routeInfo == 0 then 
		if tonumber(staticCount) < staticLimit then
			result[1] = staticLimit - redis.call('HINCRBY', staticKey, "Count", 1)
		else 
			result[1] = -1
		end
		redis.call('HSET', routeKey, "Count", 1, "Deadline", routeDeadline)
		result[2] = routeLimit - 1
		result[3] = routeDeadline
		return result
	end

	local rDead = tonumber(routeInfo[4]) --  expired time	
	local rCount = tonumber(routeInfo[2])  
	local sCount = tonumber(staticCount)
	
	if rDead < now then -- 過期
		if tonumber(staticCount) < staticLimit then 
			result[1] = staticLimit - redis.call('HINCRBY', staticKey, "Count", 1)
		else 
			result[1] = -1
		end
		redis.call('HSET', routeKey, "Count", 1, "Deadline", routeDeadline)
		result[2] = routeLimit - 1
		result[3] = routeDeadline
		return result
	end

	if sCount < staticLimit then 
		result[1] = staticLimit - redis.call('HINCRBY', staticKey, "Count", 1)
	else 
		result[1] = -1
	end

	if rCount < routeLimit then 
		result[2] = redis.call('HINCRBY', routeKey, "Count", 1)
	else 
		result[2] = -1
	end

	result[3] = rDead
	return result
`