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#include "async.h"
#include <util/generic/singleton.h>
#include <util/generic/vector.h>
#include <contrib/libs/c-ares/include/ares.h>
using namespace NAsyncDns;
namespace {
struct TAresError: public TDnsError {
inline TAresError(int code) {
(*this) << ares_strerror(code);
}
};
struct TAresInit {
inline TAresInit() {
const int code = ares_library_init(ARES_LIB_INIT_ALL);
if (code) {
ythrow TAresError(code) << "can not init ares engine";
}
}
inline ~TAresInit() {
ares_library_cleanup();
}
static inline void InitOnce() {
Singleton<TAresInit>();
}
};
}
class TAsyncDns::TImpl {
public:
inline TImpl(IPoller* poller, const TOptions& o)
: P_(poller)
{
TAresInit::InitOnce();
ares_options opts;
Zero(opts);
int optflags = 0;
optflags |= ARES_OPT_FLAGS;
opts.flags = ARES_FLAG_STAYOPEN;
optflags |= ARES_OPT_TIMEOUTMS;
opts.timeout = o.TimeOut.MilliSeconds();
optflags |= ARES_OPT_TRIES;
opts.tries = o.Retries;
optflags |= ARES_OPT_SOCK_STATE_CB;
opts.sock_state_cb = (decltype(opts.sock_state_cb))StateCb;
static_assert(sizeof(opts.sock_state_cb) == sizeof(&StateCb), "Inconsistent socket state size");
opts.sock_state_cb_data = this;
const int code = ares_init_options(&H_, &opts, optflags);
if (code) {
ythrow TAresError(code) << "can not init ares channel";
}
}
inline ~TImpl() {
ares_destroy(H_);
}
inline TDuration Timeout() {
struct timeval tv;
Zero(tv);
ares_timeout(H_, nullptr, &tv);
return TDuration(tv);
}
template <class T>
inline void ProcessSocket(T s) {
ares_process_fd(H_, s, s);
}
inline void ProcessNone() {
ProcessSocket(ARES_SOCKET_BAD);
}
inline void AsyncResolve(const TNameRequest& req) {
ares_gethostbyname(H_, req.Addr, req.Family, AsyncResolveHostCb, req.CB);
}
private:
static void StateCb(void* arg, int s, int read, int write) {
((TImpl*)arg)->P_->OnStateChange((SOCKET)s, (bool)read, (bool)write);
}
static void AsyncResolveHostCb(void* arg, int status, int timeouts, hostent* he) {
const IHostResult::TResult res = {
status, timeouts, he};
((IHostResult*)arg)->OnComplete(res);
}
private:
IPoller* P_;
ares_channel H_;
};
void NAsyncDns::CheckAsyncStatus(int status) {
if (status) {
ythrow TAresError(status);
}
}
void NAsyncDns::CheckPartialAsyncStatus(int status) {
if (status == ARES_ENODATA) {
return;
}
CheckAsyncStatus(status);
}
TAsyncDns::TAsyncDns(IPoller* poller, const TOptions& opts)
: I_(new TImpl(poller, opts))
{
}
TAsyncDns::~TAsyncDns() {
}
void TAsyncDns::AsyncResolve(const TNameRequest& req) {
I_->AsyncResolve(req);
}
TDuration TAsyncDns::Timeout() {
return I_->Timeout();
}
void TAsyncDns::ProcessSocket(SOCKET s) {
I_->ProcessSocket(s);
}
void TAsyncDns::ProcessNone() {
I_->ProcessNone();
}
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