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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.
*/
#pragma once
#include "iputils.hh"
#include "tcpiohandler.hh"
class TCPOutConnectionManager
{
public:
// Max idle time for a connection, 0 is no timeout
static struct timeval s_maxIdleTime;
// Per thread maximum of idle connections for a specific destination, 0 means no idle connections will be kept open
static size_t s_maxIdlePerAuth;
// Max total number of queries to handle per connection, 0 is no max
static size_t s_maxQueries;
// Per thread max # of idle connections, 0 means no idle connections will be kept open
static size_t s_maxIdlePerThread;
struct Connection
{
std::string toString() const
{
if (d_handler) {
return std::to_string(d_handler->getDescriptor()) + ' ' + std::to_string(d_handler.use_count());
}
return "";
}
std::shared_ptr<TCPIOHandler> d_handler;
timeval d_last_used{0, 0};
size_t d_numqueries{0};
};
void store(const struct timeval& now, const ComboAddress& ip, Connection&& connection);
Connection get(const ComboAddress& ip);
void cleanup(const struct timeval& now);
size_t size() const
{
return d_idle_connections.size();
}
uint64_t* getSize() const
{
return new uint64_t(size());
}
private:
// This does not take into account that we can have multiple connections with different hosts (via SNI) to the same IP.
// That is OK, since we are connecting by IP only at the moment.
std::multimap<ComboAddress, Connection> d_idle_connections;
};
extern thread_local TCPOutConnectionManager t_tcp_manager;
uint64_t getCurrentIdleTCPConnections();
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