Struct Dup 

pub struct Dup { /* private fields */ }

A bounded, TTL-based deduplication tracker matching Gun.js dup.js.

Tracks message IDs with timestamps. Entries that haven’t been seen within the TTL are automatically evicted. The map is also bounded by max entries — when exceeded, the oldest third is evicted.

Implementations

impl Dup

pub fn new(max: usize, age_secs: u64) -> Self

Creates a new dedup tracker with the given capacity and TTL.

Arguments

• max — Maximum number of entries before forced eviction.
• age_secs — TTL in seconds. Entries older than this are evicted.

pub fn default_gun() -> Self

Creates a new dedup tracker with Gun.js defaults: 100,000 entries, 9s TTL.

pub fn check(&mut self, id: &str) -> bool

Gun.js dup.check(id): returns true if id has been seen within the TTL. If expired, removes it and returns false.

This is lazy eviction — expired entries are cleaned up on access.

pub fn track(&mut self, id: &str)

Gun.js dup.track(id): marks id as seen now.

Also performs periodic cleanup if enough time has passed:

• If entries exceed max, evicts the oldest third.
• If last_drop was more than age / 2 ago, runs drop().

pub fn drop(&mut self, force_age: Option<Duration>)

Remove entries older than age. force_age overrides self.age.

This is Gun.js dup.drop(age) — called periodically to clean expired entries from the map.

pub fn len(&self) -> usize

Returns the number of entries currently tracked.

pub fn is_empty(&self) -> bool

Returns true if no entries are currently tracked.

pub fn max(&self) -> usize

Returns the maximum capacity.

pub fn age(&self) -> Duration

Returns the TTL duration.

pub fn clear(&mut self)

Removes all entries, resetting the tracker to empty.

Trait Implementations

impl Default for Dup

fn default() -> Self

Returns the “default value” for a type.