Struct CachingResolver

upstream/resolver.go:265–276

CachingResolver is a [Resolver] that caches the results of lookups. It's required to be created with [NewCachingResolver].

// CachingResolver is a [Resolver] that caches the results of lookups.  It's
// required to be created with [NewCachingResolver].
type CachingResolver struct {
	// resolver is the underlying resolver to use for lookups.
	resolver *UpstreamResolver

	// mu protects cache and it's elements.
	mu *sync.RWMutex

	// cache is the set of resolved hostnames mapped to cached addresses.
	//
	// TODO(e.burkov):  Use expiration cache.
	cache map[string]*ipResult
}

// NewCachingResolver creates a new caching resolver that uses r for lookups.
func NewCachingResolver(r *UpstreamResolver) (cr *CachingResolver) {