Struct HandshakeDefender 

pub struct HandshakeDefender { /* private fields */ }

A lightweight in-memory handshake rate limiter.

Concurrency note: check may invoke a probabilistic cleanup via retain when per_ip grows large. That cleanup can briefly lock shards. For strict latency guarantees, move cleanup to a background task instead of running inline with request handling.

Implementations

impl HandshakeDefender

pub fn new(cfg: HandshakeConfig) -> HandshakeDefender

pub fn enabled(&self) -> bool

pub async fn check(&self, ip: IpAddr) -> Result<(), u64>

Check handshake allowance. Returns Ok if allowed. On reject, returns retry-after seconds (min 1).

Trait Implementations

impl Debug for HandshakeDefender

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.