pdns/remote_logger.hh

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #pragma once
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <atomic>
  28 #include <condition_variable>
  29 #include <queue>
  30 #include <thread>
  31
  32 #include "iputils.hh"
  33
  34 class RemoteLoggerInterface
  35 {
  36 public:
  37   virtual ~RemoteLoggerInterface() {};
  38   virtual void queueData(const std::string& data) = 0;
  39   virtual std::string toString() = 0;
  40 };
  41
  42 class RemoteLogger : public RemoteLoggerInterface
  43 {
  44 public:
  45   RemoteLogger(const ComboAddress& remote, uint16_t timeout=2, uint64_t maxQueuedEntries=100, uint8_t reconnectWaitTime=1, bool asyncConnect=false);
  46   virtual ~RemoteLogger();
  47   virtual void queueData(const std::string& data) override;
  48   virtual std::string toString() override
  49   {
  50     return "RemoteLogger to " + d_remote.toStringWithPort();
  51   }
  52   void stop()
  53   {
  54     d_exiting = true;
  55   }
  56   uint64_t getGeneration() const
  57   {
  58     return d_generation;
  59   }
  60   void setGeneration(uint64_t newGeneration)
  61   {
  62     d_generation = newGeneration;
  63   }
  64 private:
  65   void busyReconnectLoop();
  66   bool reconnect();
  67   void worker();
  68
  69   std::queue<std::string> d_writeQueue;
  70   std::mutex d_writeMutex;
  71   std::condition_variable d_queueCond;
  72   ComboAddress d_remote;
  73   uint64_t d_maxQueuedEntries;
  74   uint64_t d_generation{0};
  75   int d_socket{-1};
  76   uint16_t d_timeout;
  77   uint8_t d_reconnectWaitTime;
  78   std::atomic<bool> d_exiting{false};
  79   bool d_asyncConnect{false};
  80   bool d_connected{false};
  81   std::thread d_thread;
  82 };