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#pragma once
#include <library/cpp/testing/unittest/tests_data.h>
#include <util/network/sock.h>
#include <util/network/poller.h>
#include <util/system/thread.h>
#include <util/system/hp_timer.h>
#include <util/generic/list.h>
#include <util/generic/set.h>
#include <util/generic/vector.h>
#include <util/generic/deque.h>
#include <util/random/random.h>
#include <iterator>
class TTrafficInterrupter
: public ISimpleThread {
const TString Address;
const ui16 ForwardPort;
TInet6StreamSocket ListenSocket;
struct TConnectionDescriptor;
struct TDelayedPacket {
TInet6StreamSocket* ForwardSocket = nullptr;
TVector<char> Data;
};
struct TCompare {
bool operator()(const std::pair<TInstant, TDelayedPacket>& x, const std::pair<TInstant, TDelayedPacket>& y) const {
return x.first > y.first;
};
};
struct TDirectedConnection {
TInet6StreamSocket* Source = nullptr;
TInet6StreamSocket* Destination = nullptr;
TList<TConnectionDescriptor>::iterator ListIterator;
TInstant Timestamp;
TPriorityQueue<std::pair<TInstant, TDelayedPacket>, TVector<std::pair<TInstant, TDelayedPacket>>, TCompare> DelayedQueue;
TDirectedConnection(TInet6StreamSocket* source, TInet6StreamSocket* destination)
: Source(source)
, Destination(destination)
{
}
};
struct TConnectionDescriptor {
std::unique_ptr<TInet6StreamSocket> FirstSocket;
std::unique_ptr<TInet6StreamSocket> SecondSocket;
TDirectedConnection ForwardConnection;
TDirectedConnection BackwardConnection;
TConnectionDescriptor(std::unique_ptr<TInet6StreamSocket> firstSock,
std::unique_ptr<TInet6StreamSocket> secondSock)
: FirstSocket(std::move(firstSock))
, SecondSocket(std::move(secondSock))
, ForwardConnection(FirstSocket.get(), SecondSocket.get())
, BackwardConnection(SecondSocket.get(), FirstSocket.get())
{
}
};
template <class It = TList<TConnectionDescriptor>::iterator>
class TCustomListIteratorCompare {
public:
bool operator()(const It& it1, const It& it2) const {
return (&(*it1) < &(*it2));
}
};
TList<TConnectionDescriptor> Connections;
TSet<TList<TConnectionDescriptor>::iterator, TCustomListIteratorCompare<>> DroppedConnections;
public:
TTrafficInterrupter(TString address, ui16 listenPort, ui16 forwardPort, TDuration rejectingTrafficTimeout, double bandwidth, bool disconnect = true)
: Address(std::move(address))
, ForwardPort(forwardPort)
, ListenSocket()
, RejectingTrafficTimeout(rejectingTrafficTimeout)
, CurrentRejectingTimeout(rejectingTrafficTimeout)
, RejectingStateTimer()
, Bandwidth(bandwidth)
, Disconnect(disconnect)
, RejectingTraffic(false)
{
SetReuseAddressAndPort(ListenSocket);
TSockAddrInet6 addr(Address.data(), listenPort);
Y_VERIFY(ListenSocket.Bind(&addr) == 0);
Y_VERIFY(ListenSocket.Listen(5) == 0);
DelayTraffic = (Bandwidth == 0.0) ? false : true;
ForwardAddrress.Reset(new TSockAddrInet6(Address.data(), ForwardPort));
const ui32 BufSize = DelayTraffic ? 4096 : 65536 + 4096;
Buf.resize(BufSize);
}
~TTrafficInterrupter() {
AtomicSet(Running, 0);
this->Join();
}
private:
TAtomic Running = 1;
TVector<char> Buf;
TSocketPoller SocketPoller;
THolder<TSockAddrInet6> ForwardAddrress;
TVector<void*> Events;
TDuration RejectingTrafficTimeout;
TDuration CurrentRejectingTimeout;
TDuration DefaultPollTimeout = TDuration::MilliSeconds(100);
TDuration DisconnectTimeout = TDuration::MilliSeconds(100);
THPTimer RejectingStateTimer;
THPTimer DisconnectTimer;
double Bandwidth;
const bool Disconnect;
bool RejectingTraffic;
bool DelayTraffic;
void UpdateRejectingState() {
if (TDuration::Seconds(std::abs(RejectingStateTimer.Passed())) > CurrentRejectingTimeout) {
RejectingStateTimer.Reset();
CurrentRejectingTimeout = (RandomNumber<ui32>(1) ? RejectingTrafficTimeout + TDuration::Seconds(1.0) : RejectingTrafficTimeout - TDuration::Seconds(0.2));
RejectingTraffic = !RejectingTraffic;
}
}
void RandomlyDisconnect() {
if (TDuration::Seconds(std::abs(DisconnectTimer.Passed())) > DisconnectTimeout) {
DisconnectTimer.Reset();
if (RandomNumber<ui32>(100) > 90) {
if (!Connections.empty()) {
auto it = Connections.begin();
std::advance(it, RandomNumber<ui32>(Connections.size()));
SocketPoller.Unwait(static_cast<SOCKET>(*it->FirstSocket.get()));
SocketPoller.Unwait(static_cast<SOCKET>(*it->SecondSocket.get()));
Connections.erase(it);
}
}
}
}
void* ThreadProc() override {
int pollReadyCount = 0;
SocketPoller.WaitRead(static_cast<SOCKET>(ListenSocket), &ListenSocket);
Events.resize(10);
while (AtomicGet(Running)) {
if (RejectingTrafficTimeout != TDuration::Zero()) {
UpdateRejectingState();
}
if (Disconnect) {
RandomlyDisconnect();
}
if (!RejectingTraffic) {
TDuration timeout = DefaultPollTimeout;
auto updateTimout = [&timeout](TDirectedConnection& conn) {
if (conn.DelayedQueue) {
timeout = Min(timeout, conn.DelayedQueue.top().first - TInstant::Now());
}
};
for (auto& it : Connections) {
updateTimout(it.ForwardConnection);
updateTimout(it.BackwardConnection);
}
pollReadyCount = SocketPoller.WaitT(Events.data(), Events.size(), timeout);
if (pollReadyCount > 0) {
for (int i = 0; i < pollReadyCount; i++) {
HandleSocketPollEvent(Events[i]);
}
for (auto it : DroppedConnections) {
Connections.erase(it);
}
DroppedConnections.clear();
}
}
if (DelayTraffic) { // process packets from DelayQueues
auto processDelayedPackages = [](TDirectedConnection& conn) {
while (!conn.DelayedQueue.empty()) {
auto& frontPackage = conn.DelayedQueue.top();
if (TInstant::Now() >= frontPackage.first) {
TInet6StreamSocket* sock = frontPackage.second.ForwardSocket;
if (sock) {
sock->Send(frontPackage.second.Data.data(), frontPackage.second.Data.size());
}
conn.DelayedQueue.pop();
} else {
break;
}
}
};
for (auto& it : Connections) {
processDelayedPackages(it.ForwardConnection);
processDelayedPackages(it.BackwardConnection);
}
}
}
ListenSocket.Close();
return nullptr;
}
void HandleSocketPollEvent(void* ev) {
if (ev == static_cast<void*>(&ListenSocket)) {
TSockAddrInet6 origin;
Connections.emplace_back(TConnectionDescriptor(std::unique_ptr<TInet6StreamSocket>(new TInet6StreamSocket), std::unique_ptr<TInet6StreamSocket>(new TInet6StreamSocket)));
int err = ListenSocket.Accept(Connections.back().FirstSocket.get(), &origin);
if (!err) {
err = Connections.back().SecondSocket->Connect(ForwardAddrress.Get());
if (!err) {
Connections.back().ForwardConnection.ListIterator = --Connections.end();
Connections.back().BackwardConnection.ListIterator = --Connections.end();
SocketPoller.WaitRead(static_cast<SOCKET>(*Connections.back().FirstSocket), &Connections.back().ForwardConnection);
SocketPoller.WaitRead(static_cast<SOCKET>(*Connections.back().SecondSocket), &Connections.back().BackwardConnection);
} else {
Connections.back().FirstSocket->Close();
}
} else {
Connections.pop_back();
}
} else {
TDirectedConnection* directedConnection = static_cast<TDirectedConnection*>(ev);
int recvSize = 0;
do {
recvSize = directedConnection->Source->Recv(Buf.data(), Buf.size());
} while (recvSize == -EINTR);
if (recvSize > 0) {
if (DelayTraffic) {
// put packet into DelayQueue
const TDuration baseDelay = TDuration::MicroSeconds(recvSize * 1e6 / Bandwidth);
const TInstant now = TInstant::Now();
directedConnection->Timestamp = Max(now, directedConnection->Timestamp) + baseDelay;
TDelayedPacket pkt;
pkt.ForwardSocket = directedConnection->Destination;
pkt.Data.resize(recvSize);
memcpy(pkt.Data.data(), Buf.data(), recvSize);
directedConnection->DelayedQueue.emplace(directedConnection->Timestamp, std::move(pkt));
} else {
directedConnection->Destination->Send(Buf.data(), recvSize);
}
} else {
SocketPoller.Unwait(static_cast<SOCKET>(*directedConnection->Source));
SocketPoller.Unwait(static_cast<SOCKET>(*directedConnection->Destination));
DroppedConnections.emplace(directedConnection->ListIterator);
}
}
}
};
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