137 lines
3.8 KiB
C++
137 lines
3.8 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_DNS_CACHE_H
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#define D_DNS_CACHE_H
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#include "common.h"
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#include <string>
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#include <set>
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#include <algorithm>
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#include <vector>
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#include "a2functional.h"
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namespace aria2 {
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class DNSCache {
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private:
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struct AddrEntry {
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std::string addr_;
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bool good_;
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AddrEntry(const std::string& addr);
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AddrEntry(const AddrEntry& c);
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~AddrEntry();
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AddrEntry& operator=(const AddrEntry& c);
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};
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struct CacheEntry {
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std::string hostname_;
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uint16_t port_;
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std::vector<AddrEntry> addrEntries_;
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CacheEntry(const std::string& hostname, uint16_t port);
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CacheEntry(const CacheEntry& c);
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~CacheEntry();
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CacheEntry& operator=(const CacheEntry& c);
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bool add(const std::string& addr);
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std::vector<AddrEntry>::iterator find(const std::string& addr);
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std::vector<AddrEntry>::const_iterator find(const std::string& addr) const;
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bool contains(const std::string& addr) const;
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const std::string& getGoodAddr() const;
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template <typename OutputIterator>
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void getAllGoodAddrs(OutputIterator out) const
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{
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for (auto& elem : addrEntries_) {
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if (elem.good_) {
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*out++ = elem.addr_;
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}
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}
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}
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void markBad(const std::string& addr);
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bool operator<(const CacheEntry& e) const;
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bool operator==(const CacheEntry& e) const;
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};
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typedef std::set<std::shared_ptr<CacheEntry>,
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DerefLess<std::shared_ptr<CacheEntry>>>
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CacheEntrySet;
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CacheEntrySet entries_;
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public:
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DNSCache();
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DNSCache(const DNSCache& c);
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~DNSCache();
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DNSCache& operator=(const DNSCache& c);
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const std::string& find(const std::string& hostname, uint16_t port) const;
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template <typename OutputIterator>
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void findAll(OutputIterator out, const std::string& hostname,
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uint16_t port) const
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{
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auto target = std::make_shared<CacheEntry>(hostname, port);
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auto i = entries_.find(target);
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if (i != entries_.end()) {
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(*i)->getAllGoodAddrs(out);
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}
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}
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void put(const std::string& hostname, const std::string& ipaddr,
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uint16_t port);
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void markBad(const std::string& hostname, const std::string& ipaddr,
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uint16_t port);
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void remove(const std::string& hostname, uint16_t port);
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};
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} // namespace aria2
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#endif // D_DNS_CACHE_H
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