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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2016 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef SHRPX_DUAL_DNS_RESOLVER_H
#define SHRPX_DUAL_DNS_RESOLVER_H
#include "shrpx.h"
#include <ev.h>
#include "shrpx_dns_resolver.h"
using namespace nghttp2;
namespace shrpx {
// DualDNSResolver performs name resolution for both A and AAAA
// records at the same time. The first successful return (or if we
// have both successful results, prefer to AAAA) is chosen. This is
// wrapper around 2 DNSResolver inside. resolve(), get_status(), and
// how CompleteCb is called have the same semantics with DNSResolver.
class DualDNSResolver {
public:
// |family| controls IP version preference. If |family| ==
// AF_UNSPEC, bot A and AAAA lookups are performed. If |family| ==
// AF_INET, only A lookup is performed. If |family| == AF_INET6,
// only AAAA lookup is performed.
DualDNSResolver(struct ev_loop *loop, int family);
// Resolves |host|. |host| must be NULL-terminated string.
int resolve(const StringRef &host);
CompleteCb get_complete_cb() const;
void set_complete_cb(CompleteCb cb);
DNSResolverStatus get_status(Address *result) const;
private:
// IP version preference.
int family_;
// For A record
DNSResolver resolv4_;
// For AAAA record
DNSResolver resolv6_;
CompleteCb complete_cb_;
};
} // namespace shrpx
#endif // SHRPX_DUAL_DNS_RESOLVER_H
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