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#include "flow_controlled_queue.h"
#include <library/cpp/actors/core/interconnect.h>
#include <library/cpp/actors/core/hfunc.h>
#include <library/cpp/actors/util/datetime.h>
#include <util/generic/deque.h>
#include <util/datetime/cputimer.h>
#include <util/generic/algorithm.h>
namespace NActors {
class TFlowControlledRequestQueue;
class TFlowControlledRequestActor : public IActorCallback {
TFlowControlledRequestQueue * const QueueActor;
void HandleReply(TAutoPtr<IEventHandle> &ev);
void HandleUndelivered(TEvents::TEvUndelivered::TPtr &ev);
public:
const TActorId Source;
const ui64 Cookie;
const ui32 Flags;
const ui64 StartCounter;
TFlowControlledRequestActor(ui32 activity, TFlowControlledRequestQueue *queue, TActorId source, ui64 cookie, ui32 flags)
: IActorCallback(static_cast<TReceiveFunc>(&TFlowControlledRequestActor::StateWait), activity)
, QueueActor(queue)
, Source(source)
, Cookie(cookie)
, Flags(flags)
, StartCounter(GetCycleCountFast())
{}
STATEFN(StateWait) {
switch (ev->GetTypeRewrite()) {
hFunc(TEvents::TEvUndelivered, HandleUndelivered);
default:
HandleReply(ev);
}
}
TDuration AccumulatedLatency() const {
const ui64 cc = GetCycleCountFast() - StartCounter;
return CyclesToDuration(cc);
}
using IActor::PassAway;
};
class TFlowControlledRequestQueue : public IActorCallback {
const TActorId Target;
const TFlowControlledQueueConfig Config;
TDeque<THolder<IEventHandle>> UnhandledRequests;
TDeque<TFlowControlledRequestActor *> RegisteredRequests;
bool Subscribed = false;
TDuration MinimalSeenLatency;
bool CanRegister() {
const ui64 inFly = RegisteredRequests.size();
if (inFly <= Config.MinAllowedInFly) // <= for handling minAllowed == 0
return true;
if (inFly >= Config.MaxAllowedInFly)
return false;
if (Config.TargetDynamicRate) {
if (const ui64 dynMax = MinimalSeenLatency.MicroSeconds() * Config.TargetDynamicRate / 1000000) {
if (inFly >= dynMax)
return false;
}
}
const TDuration currentLatency = RegisteredRequests.front()->AccumulatedLatency();
if (currentLatency <= Config.MinTrackedLatency)
return true;
if (currentLatency <= MinimalSeenLatency * Config.LatencyFactor)
return true;
return false;
}
void HandleForwardedEvent(TAutoPtr<IEventHandle> &ev) {
if (CanRegister()) {
RegisterReqActor(ev);
} else {
UnhandledRequests.emplace_back(ev.Release());
}
}
void RegisterReqActor(THolder<IEventHandle> ev) {
TFlowControlledRequestActor *reqActor = new TFlowControlledRequestActor(ActivityType, this, ev->Sender, ev->Cookie, ev->Flags);
const TActorId reqActorId = RegisterWithSameMailbox(reqActor);
RegisteredRequests.emplace_back(reqActor);
if (!Subscribed && (Target.NodeId() != SelfId().NodeId())) {
Send(TActivationContext::InterconnectProxy(Target.NodeId()), new TEvents::TEvSubscribe(), IEventHandle::FlagTrackDelivery);
Subscribed = true;
}
TActivationContext::Send(new IEventHandle(Target, reqActorId, ev.Get()->ReleaseBase().Release(), IEventHandle::FlagTrackDelivery, ev->Cookie));
}
void PumpQueue() {
while (RegisteredRequests && RegisteredRequests.front() == nullptr)
RegisteredRequests.pop_front();
while (UnhandledRequests && CanRegister()) {
RegisterReqActor(std::move(UnhandledRequests.front()));
UnhandledRequests.pop_front();
}
}
void HandleDisconnected() {
Subscribed = false;
const ui32 nodeid = Target.NodeId();
for (TFlowControlledRequestActor *reqActor : RegisteredRequests) {
if (reqActor) {
if (reqActor->Flags & IEventHandle::FlagSubscribeOnSession) {
TActivationContext::Send(
new IEventHandle(reqActor->Source, TActorId(), new TEvInterconnect::TEvNodeDisconnected(nodeid), 0, reqActor->Cookie)
);
}
reqActor->PassAway();
}
}
RegisteredRequests.clear();
for (auto &ev : UnhandledRequests) {
const auto reason = TEvents::TEvUndelivered::Disconnected;
if (ev->Flags & IEventHandle::FlagTrackDelivery) {
TActivationContext::Send(
new IEventHandle(ev->Sender, ev->Recipient, new TEvents::TEvUndelivered(ev->GetTypeRewrite(), reason), 0, ev->Cookie)
);
}
}
UnhandledRequests.clear();
}
void HandlePoison() {
HandleDisconnected();
if (SelfId().NodeId() != Target.NodeId())
Send(TActivationContext::InterconnectProxy(Target.NodeId()), new TEvents::TEvUnsubscribe());
PassAway();
}
public:
TFlowControlledRequestQueue(TActorId target, ui32 activity, const TFlowControlledQueueConfig &config)
: IActorCallback(static_cast<TReceiveFunc>(&TFlowControlledRequestQueue::StateWork), activity)
, Target(target)
, Config(config)
, MinimalSeenLatency(TDuration::Seconds(1))
{}
STATEFN(StateWork) {
switch (ev->GetTypeRewrite()) {
cFunc(TEvInterconnect::TEvNodeDisconnected::EventType, HandleDisconnected);
IgnoreFunc(TEvInterconnect::TEvNodeConnected);
cFunc(TEvents::TEvUndelivered::EventType, HandleDisconnected);
cFunc(TEvents::TEvPoison::EventType, HandlePoison);
default:
HandleForwardedEvent(ev);
}
}
void HandleRequestReply(TAutoPtr<IEventHandle> &ev, TFlowControlledRequestActor *reqActor) {
auto it = Find(RegisteredRequests, reqActor);
if (it == RegisteredRequests.end())
return;
TActivationContext::Send(ev->Forward(reqActor->Source).Release());
const TDuration reqLatency = reqActor->AccumulatedLatency();
if (reqLatency < MinimalSeenLatency)
MinimalSeenLatency = reqLatency;
*it = nullptr;
PumpQueue();
}
void HandleRequestUndelivered(TEvents::TEvUndelivered::TPtr &ev, TFlowControlledRequestActor *reqActor) {
auto it = Find(RegisteredRequests, reqActor);
if (it == RegisteredRequests.end())
return;
TActivationContext::Send(ev->Forward(reqActor->Source).Release());
*it = nullptr;
PumpQueue();
}
};
void TFlowControlledRequestActor::HandleReply(TAutoPtr<IEventHandle> &ev) {
QueueActor->HandleRequestReply(ev, this);
PassAway();
}
void TFlowControlledRequestActor::HandleUndelivered(TEvents::TEvUndelivered::TPtr &ev) {
QueueActor->HandleRequestUndelivered(ev, this);
PassAway();
}
IActor* CreateFlowControlledRequestQueue(TActorId targetId, ui32 activity, const TFlowControlledQueueConfig &config) {
return new TFlowControlledRequestQueue(targetId, activity, config);
}
}
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