Struct RateLimiter 

pub struct RateLimiter { /* private fields */ }

Lock-free token-bucket rate limiter using monotonic timestamps for smooth refill.

Uses std::time::Instant instead of SystemTime so the refill clock is immune to NTP adjustments and pre-epoch system clocks.

Thread-safe via AtomicU64 — no mutexes, no allocations on the hot path.

Implementations

impl RateLimiter

pub fn new(max_requests_per_sec: u64) -> Self

Create a rate limiter with the given maximum requests per second.

pub fn try_acquire(&self) -> bool

Atomically consume one token, returning true if the request is allowed.

pub fn max_tokens(&self) -> u64

Maximum token capacity.

pub fn current_tokens(&self) -> u64

Current token count (snapshot — may change immediately after reading).