New upstream version 3.0upstream/3.0

1 files changed, 58 insertions, 0 deletions

diff --git a/louloulibs/network/dns_handler.hpp b/louloulibs/network/dns_handler.hpp
new file mode 100644
index 0000000..fd1729d
--- /dev/null
+++ b/louloulibs/network/dns_handler.hpp
@@ -0,0 +1,58 @@
+#pragma once
+
+#include <louloulibs.h>
+#ifdef CARES_FOUND
+
+class TCPSocketHandler;
+class Poller;
+class DNSSocketHandler;
+
+# include <ares.h>
+# include <memory>
+# include <string>
+# include <vector>
+
+/**
+ * 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;
+  DNSHandler(const DNSHandler&) = delete;
+  DNSHandler(DNSHandler&&) = delete;
+  DNSHandler& operator=(const DNSHandler&) = delete;
+  DNSHandler& operator=(DNSHandler&&) = delete;
+
+  void gethostbyname(const std::string& name, ares_host_callback callback,
+                     void* 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();
+  void remove_all_sockets_from_poller();
+  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::vector<std::unique_ptr<DNSSocketHandler>> socket_handlers;
+  ares_channel channel;
+};
+
+#endif /* CARES_FOUND */