feat: implemented using lua

[Kikobeats]

Sorry for that, but perf matters. Holding this until add a benchmark

before

=== Async RateLimiter Benchmark ===
Iterations: 10000
Concurrency: 100
Rate limit: 100 requests per 60 seconds
IP distribution: 200 IPs (10 hot IPs receiving 20% of traffic)
Redis: localhost:6379
-----------------------------------
Warming up with 1000 requests...
Resetting Redis before benchmark...
Running 10000 iterations...

=== Benchmark Results ===
Total requests: 10000
Successful requests: 10000
Rate limited requests: 0 (0.00%)
Total time: 302.09ms
Requests per second: 33103.24

Latency:
  Average: 1.69ms
  p50: 1.44ms
  p95: 3.93ms
  p99: 6.88ms

**after **

=== Async RateLimiter Benchmark ===
Iterations: 100000
Concurrency: 100
Rate limit: 100 requests per 60 seconds
IP distribution: 200 IPs (10 hot IPs receiving 20% of traffic)
Redis: localhost:6379
-----------------------------------
Warming up with 1000 requests...
Resetting Redis before benchmark...
Running 100000 iterations...

=== Benchmark Results ===
Total requests: 100000
Successful requests: 97534
Rate limited requests: 2466 (2.47%)
Total time: 1231.12ms
Requests per second: 81226.99

Latency:
  Average: 0.63ms
  p50: 0.61ms
  p95: 0.88ms
  p99: 1.13ms

[dy0gu]

Hi there, any plans to merge this? I was thinking about writing my own rate limiter with inlined Lua, much like you just did here. Your solution seems as simple as I was looking to make mine, so I would love to have this in a released version!

[Kikobeats]

Thanks for remembering me to ship this @dy0gu 🙂

I added a benchmark, and it seems the lua implementation is much faster

[Copilot]

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src/index.js:22

• If microtime.now() returns a timestamp in microseconds, multiplying duration (in seconds) by 1000 may yield incorrect time differences when later dividing by 1000000. Consider using duration * 1000000 to ensure unit consistency.

local start = now - duration * 1000

[Copilot]

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

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