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#ifndef DNS_HANDLER_HPP_INCLUDED
#define DNS_HANDLER_HPP_INCLUDED
#include <louloulibs.h>
#ifdef CARES_FOUND
class TCPSocketHandler;
class Poller;
class DNSSocketHandler;
# include <ares.h>
# include <memory>
# include <string>
# include <list>
void on_hostname4_resolved(void* arg, int status, int, struct hostent* hostent);
void on_hostname6_resolved(void* arg, int status, int, struct hostent* hostent);
/**
* Class managing DNS resolution. It should only be statically instanciated
* once in SocketHandler. It manages ares channel and calls various
* functions of that library.
*/
class DNSHandler
{
public:
DNSHandler();
~DNSHandler() = default;
void gethostbyname(const std::string& name, TCPSocketHandler* socket_handler,
int family);
/**
* Call ares_fds to know what fd needs to be watched by the poller, create
* or destroy DNSSocketHandlers depending on the result.
*/
void watch_dns_sockets(std::shared_ptr<Poller>& poller);
/**
* Destroy and stop watching all the DNS sockets. Then de-init the channel
* and library.
*/
void destroy();
ares_channel& get_channel();
static DNSHandler instance;
private:
/**
* The list of sockets that needs to be watched, according to the last
* call to ares_fds. DNSSocketHandlers are added to it or removed from it
* in the watch_dns_sockets() method
*/
std::list<std::unique_ptr<DNSSocketHandler>> socket_handlers;
ares_channel channel;
DNSHandler(const DNSHandler&) = delete;
DNSHandler(DNSHandler&&) = delete;
DNSHandler& operator=(const DNSHandler&) = delete;
DNSHandler& operator=(DNSHandler&&) = delete;
};
#endif /* CARES_FOUND */
#endif /* DNS_HANDLER_HPP_INCLUDED */
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