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#include "lease_holder.h"
#include "node_broker.h"
#include <library/cpp/actors/core/actor_bootstrapped.h>
#include <library/cpp/actors/core/hfunc.h>
#include <ydb/core/mon/mon.h>
#include <library/cpp/actors/core/mon.h>
#include <ydb/core/base/appdata.h>
#include <ydb/core/base/tablet_pipe.h>
#include <library/cpp/monlib/service/pages/templates.h>
#include <util/random/random.h>
namespace NKikimr {
namespace NNodeBroker {
using namespace NMon;
class TLeaseHolder : public TActorBootstrapped<TLeaseHolder> {
private:
struct TEvPrivate {
enum EEv {
EvExpire = EventSpaceBegin(TEvents::ES_PRIVATE),
EvEnd
};
static_assert(EvEnd < EventSpaceEnd(TEvents::ES_PRIVATE), "expect EvEnd < EventSpaceEnd(TEvents::ES_PRIVATE)");
struct TEvExpire : TEventLocal<TEvExpire, EvExpire> {};
};
public:
using TBase = TActorBootstrapped<TLeaseHolder>;
static constexpr NKikimrServices::TActivity::EType ActorActivityType() {
return NKikimrServices::TActivity::NODE_BROKER_LEASE_HOLDER;
}
TLeaseHolder(TInstant expire)
: LastPingEpoch(0)
, Expire(expire)
{
}
void Bootstrap(const TActorContext &ctx)
{
NActors::TMon* mon = AppData(ctx)->Mon;
if (mon) {
NMonitoring::TIndexMonPage *actorsMonPage = mon->RegisterIndexPage("actors", "Actors");
mon->RegisterActorPage(actorsMonPage, "lease", "Dynamic node lease status",
false, ctx.ExecutorThread.ActorSystem, ctx.SelfID);
}
Become(&TThis::StatePing);
ScheduleExpire(ctx);
Ping(ctx);
}
private:
STFUNC(StateIdle)
{
switch (ev->GetTypeRewrite()) {
HFunc(TEvents::TEvWakeup, HandleIdle);
HFunc(TEvHttpInfo, Handle);
HFunc(TEvPrivate::TEvExpire, Handle);
HFunc(TEvTabletPipe::TEvClientDestroyed, HandleIdle);
HFunc(TEvTabletPipe::TEvClientConnected, HandleIdle);
IgnoreFunc(TEvNodeBroker::TEvExtendLeaseResponse);
default:
Y_FAIL("TLeaseHolder::StateIdle unexpected event type: %" PRIx32 " event: %s",
ev->GetTypeRewrite(), ev->HasEvent() ? ev->GetBase()->ToString().data() : "serialized?");
}
}
STFUNC(StatePing)
{
switch (ev->GetTypeRewrite()) {
HFunc(TEvHttpInfo, Handle);
HFunc(TEvNodeBroker::TEvExtendLeaseResponse, Handle);
HFunc(TEvPrivate::TEvExpire, Handle);
HFunc(TEvTabletPipe::TEvClientDestroyed, Handle);
HFunc(TEvTabletPipe::TEvClientConnected, Handle);
default:
Y_FAIL("TLeaseHolder::StatePing unexpected event type: %" PRIx32 " event: %s",
ev->GetTypeRewrite(), ev->HasEvent() ? ev->GetBase()->ToString().data() : "serialized?");
}
}
void Die(const TActorContext &ctx)
{
if (NodeBrokerPipe)
NTabletPipe::CloseClient(ctx, NodeBrokerPipe);
TBase::Die(ctx);
}
void OnPipeDestroyedIdle(const TActorContext &ctx)
{
NTabletPipe::CloseClient(ctx, NodeBrokerPipe);
NodeBrokerPipe = TActorId();
}
void HandleIdle(TEvTabletPipe::TEvClientConnected::TPtr &ev, const TActorContext &ctx) {
if (ev->Get()->ClientId == NodeBrokerPipe && ev->Get()->Status != NKikimrProto::OK)
OnPipeDestroyedIdle(ctx);
}
void HandleIdle(TEvTabletPipe::TEvClientDestroyed::TPtr &ev, const TActorContext &ctx) {
if (ev->Get()->ClientId == NodeBrokerPipe)
OnPipeDestroyedIdle(ctx);
}
void HandleIdle(TEvents::TEvWakeup::TPtr &, const TActorContext &ctx) {
Become(&TThis::StatePing);
Ping(ctx);
}
void OnPipeDestroyed(const TActorContext &ctx)
{
NTabletPipe::CloseClient(ctx, NodeBrokerPipe);
NodeBrokerPipe = TActorId();
Ping(ctx);
}
void Handle(TEvTabletPipe::TEvClientConnected::TPtr &ev, const TActorContext &ctx) {
if (ev->Get()->ClientId == NodeBrokerPipe && ev->Get()->Status != NKikimrProto::OK)
OnPipeDestroyed(ctx);
}
void Handle(TEvTabletPipe::TEvClientDestroyed::TPtr &ev, const TActorContext &ctx) {
if (ev->Get()->ClientId == NodeBrokerPipe)
OnPipeDestroyed(ctx);
}
void Connect(const TActorContext &ctx)
{
auto dinfo = AppData(ctx)->DomainsInfo;
auto &domain = dinfo->GetDomain(NodeIdToDomain(ctx.SelfID.NodeId(), *dinfo));
ui32 group = domain.DefaultStateStorageGroup;
NTabletPipe::TClientConfig config;
config.RetryPolicy = NTabletPipe::TClientRetryPolicy::WithRetries();
auto pipe = NTabletPipe::CreateClient(ctx.SelfID, MakeNodeBrokerID(group), config);
NodeBrokerPipe = ctx.Register(pipe);
}
void Handle(TEvNodeBroker::TEvExtendLeaseResponse::TPtr &ev, const TActorContext &ctx) noexcept
{
auto &rec = ev->Get()->Record;
// Error means Node Broker doesn't know about this node.
// Node is either already expired or its ID is banned.
Y_VERIFY(rec.GetNodeId() == ctx.SelfID.NodeId());
if (rec.GetStatus().GetCode() != NKikimrNodeBroker::TStatus::OK) {
LOG_ERROR(ctx, NKikimrServices::NODE_BROKER, "Cannot extend lease: %s",
rec.GetStatus().GetReason().data());
return;
}
Expire = TInstant::MicroSeconds(rec.GetExpire());
LastResponse = ctx.Now();
LOG_DEBUG_S(ctx, NKikimrServices::NODE_BROKER,
"Node has now extended lease expiring " << ToString(Expire));
if (rec.HasEpoch()) {
LastPingEpoch = rec.GetEpoch().GetId();
EpochEnd = TInstant::FromValue(rec.GetEpoch().GetEnd());
if (Expire != TInstant::Max()) {
Y_VERIFY(Expire > EpochEnd);
Y_VERIFY(rec.GetExpire() == rec.GetEpoch().GetNextEnd());
ui64 window = (Expire - EpochEnd).GetValue() / 2;
Y_VERIFY(window);
NextPing = EpochEnd + TDuration::FromValue(RandomNumber<ui64>(window));
}
} else {
NextPing = ctx.Now() + (Expire - ctx.Now()) / 2;
}
if (Expire != TInstant::Max())
ctx.Schedule(NextPing - ctx.Now(), new TEvents::TEvWakeup());
else
NextPing = TInstant::Max();
Become(&TThis::StateIdle);
}
void Ping(const TActorContext &ctx)
{
if (!NodeBrokerPipe)
Connect(ctx);
auto request = MakeHolder<TEvNodeBroker::TEvExtendLeaseRequest>();
request->Record.SetNodeId(ctx.SelfID.NodeId());
NTabletPipe::SendData(ctx, NodeBrokerPipe, request.Release());
}
void Handle(TEvHttpInfo::TPtr& ev, const TActorContext& ctx) {
TStringStream str;
HTML(str) {
PRE() {
str << "Lease expires: " << ToString(Expire) << Endl
<< "Last lease extension: " << ToString(LastResponse) << Endl
<< "Last ping epoch: " << LastPingEpoch << Endl
<< "Epoch end: " << ToString(EpochEnd) << Endl
<< "Next ping at: " << ToString(NextPing) << Endl;
}
}
ctx.Send(ev->Sender, new TEvHttpInfoRes(str.Str()));
}
void ScheduleExpire(const TActorContext &ctx)
{
if (Expire != TInstant::Max())
ctx.Schedule(Expire - ctx.Now(), new TEvPrivate::TEvExpire);
}
void Handle(TEvPrivate::TEvExpire::TPtr &,const TActorContext &ctx)
{
if (Expire <= ctx.Now())
StopNode(ctx);
else
ScheduleExpire(ctx);
}
void StopNode(const TActorContext &ctx)
{
LOG_ERROR_S(ctx, NKikimrServices::NODE_BROKER, "Stop node upon lease expiration (exit code 2)");
AppData(ctx)->KikimrShouldContinue->ShouldStop(2);
}
TString ToString(TInstant t) const
{
if (t == TInstant::Max())
return "NEVER";
return t.ToRfc822StringLocal();
}
private:
TActorId NodeBrokerPipe;
ui64 LastPingEpoch;
TInstant EpochEnd;
TInstant Expire;
TInstant LastResponse;
TInstant NextPing;
};
IActor *CreateLeaseHolder(TInstant expire)
{
return new TLeaseHolder(expire);
}
} // NNodeBroker
} // NKikimr
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