Struct DnsLru

pub struct DnsLru { /* private fields */ }

A cache specifically for storing DNS records.

This is named DnsLru for historical reasons. It currently uses a “TinyLFU” policy, implemented in the moka library.

Implementations

impl DnsLru

pub fn new(capacity: usize, ttl_config: TtlConfig) -> DnsLru

Construct a new cache

Arguments

• capacity - size in number of cached queries
• ttl_config - minimum and maximum TTLs for cached records

pub fn insert_records( &self, original_query: Query, records: impl Iterator<Item = Record>, now: Instant, ) -> Option<Lookup>

inserts a record based on the name and type.

Arguments

• original_query - is used for matching the records that should be returned
• records - the records will be partitioned by type and name for storage in the cache
• now - current time for use in associating TTLs

Return

This should always return some records, but will be None if there are no records or the original_query matches none

pub fn get( &self, query: &Query, now: Instant, ) -> Option<Result<Lookup, ProtoError>>

Based on the query, see if there are any records available

Trait Implementations

impl Clone for DnsLru

fn clone(&self) -> DnsLru

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DnsLru

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

Formats the value using the given formatter.