New DNS implementation.

src/base/net/dns/DnsUvBackend.h

@@ -0,0 +1,71 @@
+/* XMRig
+ * Copyright (c) 2018-2021 SChernykh   <https://github.com/SChernykh>
+ * Copyright (c) 2016-2021 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef XMRIG_DNSUVBACKEND_H
+#define XMRIG_DNSUVBACKEND_H
+
+
+#include "base/kernel/interfaces/IDnsBackend.h"
+#include "base/net/dns/DnsRecords.h"
+#include "base/net/tools/Storage.h"
+
+
+#include <queue>
+
+
+using uv_getaddrinfo_t = struct uv_getaddrinfo_s;
+
+
+namespace xmrig {
+
+
+class DnsUvBackend : public IDnsBackend
+{
+public:
+    XMRIG_DISABLE_COPY_MOVE(DnsUvBackend)
+
+    DnsUvBackend();
+    ~DnsUvBackend() override;
+
+protected:
+    inline const DnsRecords &records() const override   { return m_records; }
+
+    std::shared_ptr<DnsRequest> resolve(const String &host, IDnsListener *listener, uint64_t ttl) override;
+
+private:
+    bool resolve(const String &host);
+    void done();
+    void onResolved(int status, addrinfo *res);
+
+    static void onResolved(uv_getaddrinfo_t *req, int status, addrinfo *res);
+
+    DnsRecords m_records;
+    int m_status            = 0;
+    std::queue<std::weak_ptr<DnsRequest> > m_queue;
+    std::shared_ptr<uv_getaddrinfo_t> m_req;
+    uint64_t m_ts           = 0;
+    uintptr_t m_key;
+
+    static Storage<DnsUvBackend> m_storage;
+};
+
+
+} /* namespace xmrig */
+
+
+#endif /* XMRIG_DNSUVBACKEND_H */