bundled_upstream

type Upstream interface {
	// Exchange sends q to the upstream and waits for response.
	// If any error occurs. Implements must return a nil msg with a non nil error.
	// Otherwise, Implements must a msg with nil error.
	Exchange(ctx context.Context, q *dns.Msg) (*dns.Msg, error)

	// Trusted indicates whether this Upstream is trusted/reliable.
	// If true, responses from this Upstream will be accepted without checking its rcode.
	Trusted() bool

	Address() string
}