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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_NO_MAIN
#include <boost/test/unit_test.hpp>
#include "dnsdist-tcp-downstream.hh"
class MockupConnection
{
public:
MockupConnection(const std::shared_ptr<DownstreamState>& ds, std::unique_ptr<FDMultiplexer>&, const struct timeval&, std::string&&) :
d_ds(ds)
{
}
bool canBeReused() const
{
return d_reusable;
}
bool isUsable() const
{
return d_usable;
}
bool willBeReusable(bool) const
{
return d_reusable;
}
void setReused()
{
}
struct timeval getLastDataReceivedTime() const
{
return d_lastDataReceivedTime;
}
bool isIdle() const
{
return d_idle;
}
void stopIO()
{
}
std::shared_ptr<DownstreamState> getDS() const
{
return d_ds;
}
std::shared_ptr<DownstreamState> d_ds;
struct timeval d_lastDataReceivedTime
{
0, 0
};
bool d_reusable{true};
bool d_usable{true};
bool d_idle{false};
};
BOOST_AUTO_TEST_SUITE(test_dnsdist_connections_cache)
BOOST_AUTO_TEST_CASE(test_ConnectionsCache)
{
DownstreamConnectionsManager<MockupConnection> manager;
const size_t maxIdleConnPerDownstream = 5;
const uint16_t cleanupInterval = 1;
const uint16_t maxIdleTime = 5;
manager.setMaxIdleConnectionsPerDownstream(maxIdleConnPerDownstream);
manager.setCleanupInterval(cleanupInterval);
manager.setMaxIdleTime(maxIdleTime);
auto mplexer = std::unique_ptr<FDMultiplexer>(FDMultiplexer::getMultiplexerSilent());
auto downstream1 = std::make_shared<DownstreamState>(ComboAddress("192.0.2.1"));
auto downstream2 = std::make_shared<DownstreamState>(ComboAddress("192.0.2.2"));
struct timeval now;
gettimeofday(&now, nullptr);
auto conn = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_REQUIRE(conn != nullptr);
BOOST_CHECK_EQUAL(manager.count(), 1U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 1U);
BOOST_CHECK_EQUAL(manager.getIdleCount(), 0U);
/* since the connection can be reused, we should get the same one */
{
auto conn1 = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_CHECK(conn.get() == conn1.get());
BOOST_CHECK_EQUAL(manager.count(), 1U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 1U);
}
/* if we mark it non-usable, we should get a new one */
conn->d_usable = false;
auto conn2 = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_CHECK(conn.get() != conn2.get());
BOOST_CHECK_EQUAL(manager.count(), 2U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 2U);
/* since the second connection can be reused, we should get it */
{
auto conn3 = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_CHECK(conn3.get() == conn2.get());
BOOST_CHECK_EQUAL(manager.count(), 2U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 2U);
}
/* different downstream so different connection */
auto differentConn = manager.getConnectionToDownstream(mplexer, downstream2, now, std::string());
BOOST_REQUIRE(differentConn != nullptr);
BOOST_CHECK(differentConn.get() != conn.get());
BOOST_CHECK(differentConn.get() != conn2.get());
BOOST_CHECK_EQUAL(manager.count(), 3U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 3U);
{
/* but we should be able to reuse it */
auto sameConn = manager.getConnectionToDownstream(mplexer, downstream2, now, std::string());
BOOST_CHECK(sameConn.get() == differentConn.get());
BOOST_CHECK_EQUAL(manager.count(), 3U);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 3U);
}
struct timeval later = now;
later.tv_sec += cleanupInterval + 1;
/* mark the second connection as no longer usable */
conn2->d_usable = false;
/* first one as well but still fresh so it will not get checked */
conn->d_usable = true;
conn->d_lastDataReceivedTime = later;
/* third one is usable but idle for too long */
differentConn->d_idle = true;
differentConn->d_lastDataReceivedTime = later;
differentConn->d_lastDataReceivedTime.tv_sec -= (maxIdleTime + 1);
/* we should not do an actual cleanup attempt since the last cleanup was done recently */
manager.cleanupClosedConnections(now);
BOOST_CHECK_EQUAL(manager.count(), 3U);
manager.cleanupClosedConnections(later);
BOOST_CHECK_EQUAL(manager.count(), 1U);
/* mark the remaining conn as non-usable, to get new ones */
conn->d_usable = false;
conn->d_lastDataReceivedTime.tv_sec = 0;
std::vector<std::shared_ptr<MockupConnection>> conns = {conn};
while (conns.size() < maxIdleConnPerDownstream) {
auto newConn = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
newConn->d_usable = false;
conns.push_back(newConn);
BOOST_CHECK_EQUAL(manager.count(), conns.size());
}
/* if we add a new one, the oldest should NOT get expunged because they are all active ones! */
auto newConn = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_CHECK_GT(manager.count(), maxIdleConnPerDownstream);
{
/* mark all connections as not usable anymore */
for (auto& c : conns) {
c->d_usable = false;
}
/* except the last one */
newConn->d_usable = true;
BOOST_CHECK_EQUAL(manager.count(), conns.size() + 1);
later.tv_sec += cleanupInterval + 1;
manager.cleanupClosedConnections(later);
BOOST_CHECK_EQUAL(manager.count(), 1U);
}
conns.clear();
auto cleared = manager.clear();
BOOST_CHECK_EQUAL(cleared, 1U);
/* add 10 actives connections */
while (conns.size() < 10) {
newConn = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
newConn->d_usable = false;
conns.push_back(newConn);
BOOST_CHECK_EQUAL(manager.count(), conns.size());
BOOST_CHECK_EQUAL(manager.getActiveCount(), conns.size());
}
/* now we mark them as idle */
for (auto& c : conns) {
/* use a different shared_ptr to make sure that the comparison is done on the actual raw pointer */
auto shared = c;
shared->d_idle = true;
BOOST_CHECK(manager.moveToIdle(shared));
}
BOOST_CHECK_EQUAL(manager.count(), maxIdleConnPerDownstream);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 0U);
BOOST_CHECK_EQUAL(manager.getIdleCount(), maxIdleConnPerDownstream);
{
/* if we ask for a connection, one of these should become active and no longer idle */
/* but first we need to mark them as usable again */
for (const auto& c : conns) {
c->d_usable = true;
}
auto got = manager.getConnectionToDownstream(mplexer, downstream1, now, std::string());
BOOST_CHECK_EQUAL(manager.count(), maxIdleConnPerDownstream);
BOOST_CHECK_EQUAL(manager.getActiveCount(), 1U);
BOOST_CHECK_EQUAL(manager.getIdleCount(), maxIdleConnPerDownstream - 1U);
}
}
BOOST_AUTO_TEST_SUITE_END();
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