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#include "dnsresolver.h"
#include <library/cpp/actors/core/hfunc.h>
namespace NActors {
namespace NDnsResolver {
class TOnDemandDnsResolver : public TActor<TOnDemandDnsResolver> {
public:
TOnDemandDnsResolver(TOnDemandDnsResolverOptions options)
: TActor(&TThis::StateWork)
, Options(std::move(options))
{ }
static constexpr EActivityType ActorActivityType() {
return EActivityType::DNS_RESOLVER;
}
private:
STRICT_STFUNC(StateWork, {
cFunc(TEvents::TEvPoison::EventType, PassAway);
fFunc(TEvDns::TEvGetHostByName::EventType, Forward);
fFunc(TEvDns::TEvGetAddr::EventType, Forward);
});
void Forward(STATEFN_SIG) {
ev->Rewrite(ev->GetTypeRewrite(), GetUpstream());
TActivationContext::Send(ev.Release());
}
private:
TActorId GetUpstream() {
if (Y_UNLIKELY(!CachingResolverId)) {
if (Y_LIKELY(!SimpleResolverId)) {
SimpleResolverId = RegisterWithSameMailbox(CreateSimpleDnsResolver(Options));
}
CachingResolverId = RegisterWithSameMailbox(CreateCachingDnsResolver(SimpleResolverId, Options));
}
return CachingResolverId;
}
void PassAway() override {
if (CachingResolverId) {
Send(CachingResolverId, new TEvents::TEvPoison);
CachingResolverId = { };
}
if (SimpleResolverId) {
Send(SimpleResolverId, new TEvents::TEvPoison);
SimpleResolverId = { };
}
}
private:
TOnDemandDnsResolverOptions Options;
TActorId SimpleResolverId;
TActorId CachingResolverId;
};
IActor* CreateOnDemandDnsResolver(TOnDemandDnsResolverOptions options) {
return new TOnDemandDnsResolver(std::move(options));
}
} // namespace NDnsResolver
} // namespace NActors
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