Revert "Move rate limiter logic to Lua scripts"

This reverts commit b585c6676d.

service/src/main/resources/lua/validate_rate_limit.lua

@@ -1,30 +0,0 @@
-local bucketId = KEYS[1]
-
-local bucketSize = tonumber(ARGV[1])
-local leakRatePerMillis = tonumber(ARGV[2])
-local currentTimeMillis = tonumber(ARGV[3])
-local amount = tonumber(ARGV[4])
-
-local leakyBucket
-
-if redis.call("EXISTS", bucketId) == 1 then
-    leakyBucket = cjson.decode(redis.call("GET", bucketId))
-else
-    leakyBucket = {
-        bucketSize = bucketSize,
-        leakRatePerMillis = leakRatePerMillis,
-        spaceRemaining = bucketSize,
-        lastUpdateTimeMillis = currentTimeMillis
-    }
-end
-
-local elapsedTime = currentTimeMillis - leakyBucket["lastUpdateTimeMillis"]
-local updatedSpaceRemaining = math.min(leakyBucket["bucketSize"], math.floor(leakyBucket["spaceRemaining"] + (elapsedTime * leakyBucket["leakRatePerMillis"])))
-
-if updatedSpaceRemaining >= amount then
-    leakyBucket["spaceRemaining"] = updatedSpaceRemaining - amount
-    redis.call("SET", bucketId, cjson.encode(leakyBucket))
-    return true
-else
-    return false
-end