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* This software may be used and distributed according to the terms of

* the New BSD License, which is incorporated herein by reference.

#include "tfcore.h"

#include "thttpsocket.h"

#include "tsessionmanager.h"

#include "tsystemglobal.h"

#include "twebsocket.h"

#include <QCoreApplication>

#include <QElapsedTimer>

#include <QEventLoop>

#include <TActionThread>

#include <TAppSettings>

#include <TApplicationServerBase>

#include <THttpRequest>

#include <TSession>

#include <TWebApplication>

#include <atomic>

constexpr int RECV_BUF_SIZE = 8 * 1024;

namespace {

std::atomic<int> threadCounter(0);

}

int TActionThread::threadCount()

{

return threadCounter.load();

}

bool TActionThread::waitForAllDone(int msec)

{

int cnt;

QElapsedTimer time;

time.start();

while ((cnt = threadCount()) > 0) {

if (time.elapsed() > msec) {

break;

}

Tf::msleep(5);

qApp->processEvents();

}

tSystemDebug("waitForAllDone : remaining:{}", cnt);

return cnt == 0;

}

/*!

\class TActionThread

\brief The TActionThread class provides a thread context.

TActionThread::TActionThread(int socket, int maxThreads) :

QThread(),

TActionContext(),

_maxThreads(maxThreads)

{

TActionContext::socketDesc = socket;

_readBuffer.reserve(RECV_BUF_SIZE);

}

TActionThread::~TActionThread()

{

if (_httpSocket) {

_httpSocket->deleteLater();

}

if (TActionContext::socketDesc > 0) {

tf_close_socket(TActionContext::socketDesc);

}

void TActionThread::setSocketDescriptor(qintptr socket)

{

if (TActionContext::socketDesc > 0) {

tSystemWarn("Socket still open : {} [{}:{}]", TActionContext::socketDesc, __FILE__, __LINE__);

tf_close_socket(TActionContext::socketDesc);

}

TActionContext::socketDesc = socket;

}

void TActionThread::run()

{

class Counter {

std::atomic<int> &_num;

public:

Counter(std::atomic<int> &n) :

_num(n) { _num++; }

~Counter() { _num--; }

};

Counter counter(threadCounter);

QEventLoop eventLoop;

_httpSocket = new THttpSocket(_readBuffer, this);

if (TActionContext::socketDesc > 0) {

_httpSocket->setSocketDescriptor(TActionContext::socketDesc, QAbstractSocket::ConnectedState);

}

TActionContext::socketDesc = 0;

TDatabaseContext::setCurrentDatabaseContext(this);

try {

for (;;) {

THttpRequest request = readRequest(_httpSocket);

//tSystemDebug("HTTP request count: {}", (qint64)requests.count());

if (request.isEmpty()) {

break;

}

// WebSocket?

QByteArray connectionHeader = request.header().rawHeader(QByteArrayLiteral("Connection")).toLower();

if (Q_UNLIKELY(connectionHeader.contains("upgrade"))) {

QByteArray upgradeHeader = request.header().rawHeader(QByteArrayLiteral("Upgrade")).toLower();

tSystemDebug("Upgrade: {}", (const char*)upgradeHeader.data());

if (upgradeHeader == "websocket") {

// Switch to WebSocket

if (!handshakeForWebSocket(request.header())) {

goto socket_error;

}

goto socket_cleanup;

}

TActionContext::execute(request);

if (keepAliveTimeout() == 0) {

break;

}

if (threadCount() >= _maxThreads && _maxThreads > 0) {

// Do not keep-alive

break;

}

if (_httpSocket->state() != QAbstractSocket::ConnectedState) {

goto receive_end;

}

} catch (ClientErrorException &e) {

Tf::warn("Caught ClientErrorException: status code:{}", e.statusCode());

tSystemWarn("Caught ClientErrorException: status code:{}", e.statusCode());

THttpResponseHeader header;

TActionContext::writeResponse((Tf::StatusCode)e.statusCode(), header);

} catch (std::exception &e) {

Tf::error("Caught Exception: {}", e.what());

tSystemError("Caught Exception: {}", e.what());

THttpResponseHeader header;

TActionContext::writeResponse(Tf::StatusCode::InternalServerError, header);

}

receive_end:

closeSocket(); // disconnect

socket_cleanup:

// For cleanup

while (eventLoop.processEvents()) {

}

socket_error:

TActionContext::socketDesc = 0;

TActionContext::release();

TDatabaseContext::setCurrentDatabaseContext(nullptr);

_httpSocket->deleteLater();

_httpSocket = nullptr;

_readBuffer.resize(0);

}

void TActionThread::emitError(int socketError)

{

emit error(socketError);

}

THttpRequest TActionThread::readRequest(THttpSocket *socket)

{

for (;;) {

if (socket->waitForReadyReadRequest(500)) {

return socket->read();

}

if (Q_UNLIKELY(socket->state() != QAbstractSocket::ConnectedState)) {

break;

}

// Check idle timeout

if (Q_UNLIKELY(keepAliveTimeout() > 0 && socket->idleTime() >= keepAliveTimeout())) {

tSystemWarn("Reading a socket timed out after {} seconds. Descriptor:{}", keepAliveTimeout(), (int)socket->socketDescriptor());

break;

}

socket->abort();

return THttpRequest();

}

int64_t TActionThread::writeResponse(THttpResponseHeader &header, QIODevice *body)

{

if (keepAliveTimeout() > 0) {

header.setRawHeader(QByteArrayLiteral("Connection"), QByteArrayLiteral("Keep-Alive"));

}

return _httpSocket->write(static_cast<THttpHeader *>(&header), body);

}

void TActionThread::closeSocket()

{

_httpSocket->abort();

}

bool TActionThread::handshakeForWebSocket(const THttpRequestHeader &header)

{

if (!TWebSocket::searchEndpoint(header)) {

return false;

}

// Switch to WebSocket

int sd = TApplicationServerBase::duplicateSocket(_httpSocket->socketDescriptor());

TWebSocket *ws = new TWebSocket(sd, _httpSocket->peerAddress(), header);

connect(ws, SIGNAL(disconnected()), ws, SLOT(deleteLater()));

ws->moveToThread(Tf::app()->thread());

// WebSocket opening

TSession session;

QByteArray sessionId = header.cookie(TSession::sessionName());

if (!sessionId.isEmpty()) {

// Finds a session

session = TSessionManager::instance().findSession(sessionId);

}

ws->startWorkerForOpening(session);

return true;

}

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