Struct RateLimiter 

pub struct RateLimiter { /* private fields */ }

2026-09-26: The limiter, shared across requests.

Implementations

impl RateLimiter

pub fn from_env() -> Result<Arc<Self>, String>

2026-09-26: A limiter configured from the environment.

Errors

As RateLimitConfig::from_env.

pub fn config(&self) -> RateLimitConfig

pub fn admit(&self, key: &str, estimated_tokens: u64) -> RateDecision

2026-09-26: Admit or deny one request from key, debiting one request and estimated_tokens tokens from the enforced buckets. The middleware passes max_seq_len; handlers refund the unused part with Self::refund_tokens.

pub fn refund_tokens(&self, key: &str, amount: u64)

2026-09-26: Return amount tokens to key’s token bucket, up to its burst. No-op when the token bucket is disabled or the key was evicted.