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// Copyright (C) 2012-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <exceptions/exceptions.h>
// include this first to check the header is self-contained.
#include <dns/rrcollator.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/rrclass.h>
#include <dns/rrtype.h>
#include <dns/rrttl.h>
#include <dns/rdata.h>
#include <dns/rrset.h>
#include <algorithm>
#include <functional>
namespace isc {
namespace dns {
using namespace rdata;
class RRCollator::Impl {
public:
Impl(const AddRRsetCallback& callback) : callback_(callback) {}
void addRR(const Name& name, const RRClass& rrclass,
const RRType& rrtype, const RRTTL& rrttl,
const RdataPtr& rdata);
RRsetPtr current_rrset_;
const AddRRsetCallback callback_;
};
namespace {
inline bool
isSameType(RRType type1, const ConstRdataPtr& rdata1,
const ConstRRsetPtr& rrset)
{
if (type1 != rrset->getType()) {
return (false);
}
if (type1 == RRType::RRSIG()) {
RdataIteratorPtr rit = rrset->getRdataIterator();
return (dynamic_cast<const generic::RRSIG&>(*rdata1).typeCovered()
== dynamic_cast<const generic::RRSIG&>(
rit->getCurrent()).typeCovered());
}
return (true);
}
}
void
RRCollator::Impl::addRR(const Name& name, const RRClass& rrclass,
const RRType& rrtype, const RRTTL& rrttl,
const RdataPtr& rdata)
{
if (current_rrset_ && (!isSameType(rrtype, rdata, current_rrset_) ||
current_rrset_->getClass() != rrclass ||
current_rrset_->getName() != name)) {
callback_(current_rrset_);
current_rrset_.reset();
}
if (!current_rrset_) {
current_rrset_ = RRsetPtr(new RRset(name, rrclass, rrtype, rrttl));
} else if (current_rrset_->getTTL() != rrttl) {
// RRs with different TTLs are given. Smaller TTL should win.
current_rrset_->setTTL(std::min(current_rrset_->getTTL(), rrttl));
}
current_rrset_->addRdata(rdata);
}
RRCollator::RRCollator(const AddRRsetCallback& callback) :
impl_(new Impl(callback))
{}
RRCollator::~RRCollator() {
delete impl_;
}
AddRRCallback
RRCollator::getCallback() {
namespace ph = std::placeholders;
return (std::bind(&RRCollator::Impl::addRR, this->impl_,
ph::_1, ph::_2, ph::_3, ph::_4, ph::_5));
}
void
RRCollator::flush() {
if (impl_->current_rrset_) {
impl_->callback_(impl_->current_rrset_);
impl_->current_rrset_.reset();
}
}
} // end namespace dns
} // end namespace isc
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