Method setWithSubnet

proxy/cache.go:349–363

setWithSubnet stores response and upstream with subnet in the cache. The given subnet mask and IP address are used to calculate the cache key. u, n, and l must not be nil.

(req, m *dns.Msg, u upstream.Upstream, n *net.IPNet, l *slog.Logger)

// given subnet mask and IP address are used to calculate the cache key.  u, n,
// and l must not be nil.
func (c *cache) setWithSubnet(req, m *dns.Msg, u upstream.Upstream, n *net.IPNet, l *slog.Logger) {
	item := c.respToItem(m, u, l)
	if item == nil {
		return
	}

	pref, _ := n.Mask.Size()
	key := msgToKeyWithSubnet(req, n.IP.Mask(n.Mask), pref)
	packed := item.pack()

	c.itemsWithSubnetLock.Lock()
	defer c.itemsWithSubnetLock.Unlock()

	c.itemsWithSubnet.Set(key, packed)
}

// clearItems empties the simple cache.
func (c *cache) clearItems() {