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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 <sys/time.h>
#include <thread>
union ComboAddress;
namespace boost
{
size_t hash_value(const ComboAddress&);
}
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/key_extractors.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/sequenced_index.hpp>
#include <boost/multi_index/tag.hpp>
#include "dnsname.hh"
#include "iputils.hh"
#include "qtype.hh"
namespace pdns
{
using namespace ::boost::multi_index;
// ATM we have one task type, if we get more, the unique key in the index needs to be adapted
struct ResolveTask
{
DNSName d_qname;
uint16_t d_qtype;
// Deadline is not part of index and not used by operator<()
time_t d_deadline;
// Whether to run this task in regular mode (false) or in the mode that refreshes almost expired tasks
bool d_refreshMode;
// Use a function pointer as comparing std::functions is a nuisance
using TaskFunction = void (*)(const struct timeval& now, bool logErrors, const ResolveTask& task);
TaskFunction d_func;
// IP used by DoT probe tasks
ComboAddress d_ip;
// NS name used by DoT probe task, not part of index and not used by operator<()
DNSName d_nsname;
Netmask d_netmask;
bool operator<(const ResolveTask& a) const
{
return std::tie(d_qname, d_qtype, d_refreshMode, d_func, d_ip, d_netmask) < std::tie(a.d_qname, a.d_qtype, a.d_refreshMode, a.d_func, a.d_ip, a.d_netmask);
}
bool run(bool logErrors);
};
class TaskQueue
{
public:
bool empty() const
{
return d_queue.empty();
}
size_t size() const
{
return d_queue.size();
}
bool push(ResolveTask&& task);
ResolveTask pop();
uint64_t getPushes()
{
return d_pushes;
}
uint64_t getExpired()
{
return d_expired;
}
void incExpired()
{
d_expired++;
}
void clear()
{
d_queue.clear();
}
private:
struct HashTag
{
};
struct SequencedTag
{
};
typedef multi_index_container<
ResolveTask,
indexed_by<
ordered_unique<tag<HashTag>,
composite_key<ResolveTask,
member<ResolveTask, DNSName, &ResolveTask::d_qname>,
member<ResolveTask, uint16_t, &ResolveTask::d_qtype>,
member<ResolveTask, bool, &ResolveTask::d_refreshMode>,
member<ResolveTask, ResolveTask::TaskFunction, &ResolveTask::d_func>,
member<ResolveTask, ComboAddress, &ResolveTask::d_ip>,
member<ResolveTask, Netmask, &ResolveTask::d_netmask>>>,
sequenced<tag<SequencedTag>>>>
queue_t;
queue_t d_queue;
uint64_t d_pushes{0};
uint64_t d_expired{0};
};
}
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