Struct dnsResolver

internal/resolver/dns/dns_resolver.go:170–189

dnsResolver watches for the name resolution update for a non-IP target.

// dnsResolver watches for the name resolution update for a non-IP target.
type dnsResolver struct {
	host     string
	port     string
	resolver internal.NetResolver
	ctx      context.Context
	cancel   context.CancelFunc
	cc       resolver.ClientConn
	// rn channel is used by ResolveNow() to force an immediate resolution of the
	// target.
	rn chan struct{}
	// wg is used to enforce Close() to return after the watcher() goroutine has
	// finished. Otherwise, data race will be possible. [Race Example] in
	// dns_resolver_test we replace the real lookup functions with mocked ones to
	// facilitate testing. If Close() doesn't wait for watcher() goroutine
	// finishes, race detector sometimes will warn lookup (READ the lookup
	// function pointers) inside watcher() goroutine has data race with
	// replaceNetFunc (WRITE the lookup function pointers).
	wg                  sync.WaitGroup
	enableServiceConfig bool
}

// ResolveNow invoke an immediate resolution of the target that this
// dnsResolver watches.