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/******************************************************************************
* Copyright (C) 2015 Felix Rohrbach <kde@fxrh.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "connectiondata.h"
#include "logging.h"
#include "networkaccessmanager.h"
#include "jobs/basejob.h"
#include <QtCore/QTimer>
#include <QtCore/QPointer>
#include <array>
#include <queue>
using namespace Quotient;
class ConnectionData::Private {
public:
explicit Private(QUrl url) : baseUrl(std::move(url))
{
rateLimiter.setSingleShot(true);
}
QUrl baseUrl;
QByteArray accessToken;
QString lastEvent;
QString userId;
QString deviceId;
std::vector<QString> needToken;
mutable unsigned int txnCounter = 0;
const qint64 txnBase = QDateTime::currentMSecsSinceEpoch();
QString id() const { return userId + '/' + deviceId; }
using job_queue_t = std::queue<QPointer<BaseJob>>;
std::array<job_queue_t, 2> jobs; // 0 - foreground, 1 - background
QTimer rateLimiter;
};
ConnectionData::ConnectionData(QUrl baseUrl)
: d(std::make_unique<Private>(std::move(baseUrl)))
{
// Each lambda invocation below takes no more than one job from the
// queues (first foreground, then background) and resumes it; then
// restarts the rate limiter timer with duration 0, effectively yielding
// to the event loop and then resuming until both queues are empty.
QObject::connect(&d->rateLimiter, &QTimer::timeout, [this] {
// TODO: Consider moving out all job->sendRequest() invocations to
// a dedicated thread
d->rateLimiter.setInterval(0);
for (auto& q : d->jobs)
while (!q.empty()) {
const auto job = q.front();
q.pop();
if (!job || job->error() == BaseJob::Abandoned)
continue;
if (job->error() != BaseJob::Pending) {
qCCritical(MAIN)
<< "Job" << job
<< "is in the wrong status:" << job->status();
Q_ASSERT(false);
job->setStatus(BaseJob::Pending);
}
job->sendRequest();
d->rateLimiter.start();
return;
}
qCDebug(MAIN) << d->id() << "job queues are empty";
});
}
ConnectionData::~ConnectionData()
{
d->rateLimiter.disconnect();
d->rateLimiter.stop();
}
void ConnectionData::submit(BaseJob* job)
{
job->setStatus(BaseJob::Pending);
if (!d->rateLimiter.isActive()) {
QTimer::singleShot(0, job, &BaseJob::sendRequest);
return;
}
d->jobs[size_t(job->isBackground())].emplace(job);
qCDebug(MAIN) << job << "queued," << d->jobs.front().size() << "+"
<< d->jobs.back().size() << "total jobs in" << d->id()
<< "queues";
}
void ConnectionData::limitRate(std::chrono::milliseconds nextCallAfter)
{
qCDebug(MAIN) << "Jobs for" << (d->userId + "/" + d->deviceId)
<< "suspended for" << nextCallAfter.count() << "ms";
d->rateLimiter.start(nextCallAfter);
}
QByteArray ConnectionData::accessToken() const { return d->accessToken; }
QUrl ConnectionData::baseUrl() const { return d->baseUrl; }
QNetworkAccessManager* ConnectionData::nam() const
{
return NetworkAccessManager::instance();
}
void ConnectionData::setBaseUrl(QUrl baseUrl)
{
d->baseUrl = std::move(baseUrl);
qCDebug(MAIN) << "updated baseUrl to" << d->baseUrl;
}
void ConnectionData::setToken(QByteArray token)
{
d->accessToken = std::move(token);
}
void ConnectionData::setHost(QString host)
{
d->baseUrl.setHost(host);
qCDebug(MAIN) << "updated baseUrl to" << d->baseUrl;
}
void ConnectionData::setPort(int port)
{
d->baseUrl.setPort(port);
qCDebug(MAIN) << "updated baseUrl to" << d->baseUrl;
}
const QString& ConnectionData::deviceId() const { return d->deviceId; }
const QString& ConnectionData::userId() const { return d->userId; }
bool ConnectionData::needsToken(const QString& requestName) const
{
return std::find(d->needToken.cbegin(), d->needToken.cend(), requestName)
!= d->needToken.cend();
}
void ConnectionData::setDeviceId(const QString& deviceId)
{
d->deviceId = deviceId;
}
void ConnectionData::setUserId(const QString& userId) { d->userId = userId; }
void ConnectionData::setNeedsToken(const QString& requestName)
{
d->needToken.push_back(requestName);
}
QString ConnectionData::lastEvent() const { return d->lastEvent; }
void ConnectionData::setLastEvent(QString identifier)
{
d->lastEvent = std::move(identifier);
}
QByteArray ConnectionData::generateTxnId() const
{
return d->deviceId.toLatin1() + QByteArray::number(d->txnBase)
+ QByteArray::number(++d->txnCounter);
}
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