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#include "neh.h"
#include "details.h"
#include "factory.h"
#include <util/generic/list.h>
#include <util/generic/hash_set.h>
#include <util/digest/numeric.h>
#include <util/string/cast.h>
using namespace NNeh;
namespace {
class TMultiRequester: public IMultiRequester {
struct TOps {
template <class T>
inline bool operator()(const T& l, const T& r) const noexcept {
return l.Get() == r.Get();
}
template <class T>
inline size_t operator()(const T& t) const noexcept {
return NumericHash(t.Get());
}
};
struct TOnComplete {
TMultiRequester* Parent;
bool Signalled;
inline TOnComplete(TMultiRequester* parent)
: Parent(parent)
, Signalled(false)
{
}
inline void operator()(TWaitHandle* wh) {
THandleRef req(static_cast<THandle*>(wh));
Signalled = true;
Parent->OnComplete(req);
}
};
public:
void Add(const THandleRef& req) override {
Reqs_.insert(req);
req->Register(WaitQueue_);
}
void Del(const THandleRef& req) override {
Reqs_.erase(req);
}
bool Wait(THandleRef& req, TInstant deadLine) override {
while (Complete_.empty()) {
if (Reqs_.empty()) {
return false;
}
TOnComplete cb(this);
WaitForMultipleObj(*WaitQueue_, deadLine, cb);
if (!cb.Signalled) {
return false;
}
}
req = *Complete_.begin();
Complete_.pop_front();
return true;
}
bool IsEmpty() const override {
return Reqs_.empty() && Complete_.empty();
}
inline void OnComplete(const THandleRef& req) {
Complete_.push_back(req);
Del(req);
}
private:
typedef THashSet<THandleRef, TOps, TOps> TReqs;
typedef TList<THandleRef> TComplete;
TIntrusivePtr<TWaitQueue> WaitQueue_ = MakeIntrusive<TWaitQueue>();
TReqs Reqs_;
TComplete Complete_;
};
inline IProtocol* ProtocolForMessage(const TMessage& msg) {
return ProtocolFactory()->Protocol(TStringBuf(msg.Addr).Before(':'));
}
}
NNeh::TMessage NNeh::TMessage::FromString(const TStringBuf req) {
TStringBuf addr;
TStringBuf data;
req.Split('?', addr, data);
return TMessage(ToString(addr), ToString(data));
}
namespace {
const TString svcFail = "service status: failed";
}
THandleRef NNeh::Request(const TMessage& msg, IOnRecv* fallback) {
TServiceStatRef ss;
if (TServiceStat::Disabled()) {
return ProtocolForMessage(msg)->ScheduleRequest(msg, fallback, ss);
}
ss = GetServiceStat(msg.Addr);
TServiceStat::EStatus es = ss->GetStatus();
if (es == TServiceStat::Ok) {
return ProtocolForMessage(msg)->ScheduleRequest(msg, fallback, ss);
}
if (es == TServiceStat::ReTry) {
//send empty data request for validating service (update TServiceStat info)
TMessage validator;
validator.Addr = msg.Addr;
ProtocolForMessage(msg)->ScheduleRequest(validator, nullptr, ss);
}
TNotifyHandleRef h(new TNotifyHandle(fallback, msg));
h->NotifyError(new TError(svcFail));
return h.Get();
}
THandleRef NNeh::Request(const TString& req, IOnRecv* fallback) {
return Request(TMessage::FromString(req), fallback);
}
IMultiRequesterRef NNeh::CreateRequester() {
return new TMultiRequester();
}
bool NNeh::SetProtocolOption(TStringBuf protoOption, TStringBuf value) {
return ProtocolFactory()->Protocol(protoOption.Before('/'))->SetOption(protoOption.After('/'), value);
}
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