import { tokenBucketLimitScript } from "https://deno.land/x/upstash_ratelimit@v1.1.0-canary-1/src/lua-scripts/single.ts";
type
`
local key = KEYS[1] -- identifier including prefixes
local maxTokens = tonumber(ARGV[1]) -- maximum number of tokens
local interval = tonumber(ARGV[2]) -- size of the window in milliseconds
local refillRate = tonumber(ARGV[3]) -- how many tokens are refilled after each interval
local now = tonumber(ARGV[4]) -- current timestamp in milliseconds
local incrementBy = tonumber(ARGV[5]) -- how many tokens to consume, default is 1
local bucket = redis.call("HMGET", key, "refilledAt", "tokens")
local refilledAt
local tokens
if bucket[1] == false then
refilledAt = now
tokens = maxTokens
else
refilledAt = tonumber(bucket[1])
tokens = tonumber(bucket[2])
end
if now >= refilledAt + interval then
local numRefills = math.floor((now - refilledAt) / interval)
tokens = math.min(maxTokens, tokens + numRefills * refillRate)
refilledAt = refilledAt + numRefills * interval
end
if tokens == 0 then
return {-1, refilledAt + interval}
end
local remaining = tokens - incrementBy
local expireAt = math.ceil(((maxTokens - remaining) / refillRate)) * interval
redis.call("HSET", key, "refilledAt", refilledAt, "tokens", remaining)
redis.call("PEXPIRE", key, expireAt)
return {remaining, refilledAt + interval}
`