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#include "thread.h"
#include "magic.h"
#include <util/network/socket.h>
#include <util/thread/factory.h>
#include <util/thread/lfqueue.h>
#include <util/system/event.h>
#include <util/generic/vector.h>
#include <util/generic/singleton.h>
using namespace NDns;
namespace {
class TThreadedResolver: public IThreadFactory::IThreadAble, public TNonCopyable {
struct TResolveRequest {
inline TResolveRequest(const TString& host, ui16 port)
: Host(host)
, Port(port)
{
}
inline TNetworkAddressPtr Wait() {
E.Wait();
if (!Error) {
if (!Result) {
ythrow TNetworkResolutionError(EAI_AGAIN) << TStringBuf(": resolver down");
}
return Result;
}
Error->Raise();
ythrow TNetworkResolutionError(EAI_FAIL) << TStringBuf(": shit happen");
}
inline void Resolve() noexcept {
try {
Result = new TNetworkAddress(Host, Port);
} catch (...) {
Error = SaveError();
}
Wake();
}
inline void Wake() noexcept {
E.Signal();
}
TString Host;
ui16 Port;
TManualEvent E;
TNetworkAddressPtr Result;
IErrorRef Error;
};
public:
inline TThreadedResolver()
: E_(TSystemEvent::rAuto)
{
T_.push_back(SystemThreadFactory()->Run(this));
}
inline ~TThreadedResolver() override {
Schedule(nullptr);
for (size_t i = 0; i < T_.size(); ++i) {
T_[i]->Join();
}
{
TResolveRequest* rr = nullptr;
while (Q_.Dequeue(&rr)) {
if (rr) {
rr->Wake();
}
}
}
}
static inline TThreadedResolver* Instance() {
return Singleton<TThreadedResolver>();
}
inline TNetworkAddressPtr Resolve(const TString& host, ui16 port) {
TResolveRequest rr(host, port);
Schedule(&rr);
return rr.Wait();
}
private:
inline void Schedule(TResolveRequest* rr) {
Q_.Enqueue(rr);
E_.Signal();
}
void DoExecute() override {
while (true) {
TResolveRequest* rr = nullptr;
while (!Q_.Dequeue(&rr)) {
E_.Wait();
}
if (rr) {
rr->Resolve();
} else {
break;
}
}
Schedule(nullptr);
}
private:
TLockFreeQueue<TResolveRequest*> Q_;
TSystemEvent E_;
typedef TAutoPtr<IThreadFactory::IThread> IThreadRef;
TVector<IThreadRef> T_;
};
}
namespace NDns {
TNetworkAddressPtr ThreadedResolve(const TString& host, ui16 port) {
return TThreadedResolver::Instance()->Resolve(host, port);
}
}
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