text: // Copyright (c) 2018-2020 The Ludirium Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <zmq/zmqrpc.h>
  
  #include <rpc/server.h>
  #include <rpc/util.h>
  #include <zmq/zmqabstractnotifier.h>
  #include <zmq/zmqnotificationinterface.h>
  
  #include <univalue.h>
  
  namespace {
  
  static RPCHelpMan getzmqnotifications()
  {
      return RPCHelpMan{"getzmqnotifications",
                  "\nReturns information about the active ZeroMQ notifications.\n",
                  {},
                  RPCResult{
                      RPCResult::Type::ARR, "", "",
                      {
                          {RPCResult::Type::OBJ, "", "",
                          {
                              {RPCResult::Type::STR, "type", "Type of notification"},
                              {RPCResult::Type::STR, "address", "Address of the publisher"},
                              {RPCResult::Type::NUM, "hwm", "Outbound message high water mark"},
                          }},
                      }
                  },
                  RPCExamples{
                      HelpExampleCli("getzmqnotifications", "")
              + HelpExampleRpc("getzmqnotifications", "")
                  },
          [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
  {
      UniValue result(UniValue::VARR);
      if (g_zmq_notification_interface != nullptr) {
          for (const auto* n : g_zmq_notification_interface->GetActiveNotifiers()) {
              UniValue obj(UniValue::VOBJ);
              obj.pushKV("type", n->GetType());
              obj.pushKV("address", n->GetAddress());
              obj.pushKV("hwm", n->GetOutboundMessageHighWaterMark());
              result.push_back(obj);
          }
      }
  
      return result;
  },
      };
  }
  
  const CRPCCommand commands[] =
  { //  category           actor (function)
    //  -----------------  -----------------------
      { "zmq",             &getzmqnotifications,    },
  };
  
  } // anonymous namespace
  
  void RegisterZMQRPCCommands(CRPCTable& t)
  {
      for (const auto& c : commands) {
          t.appendCommand(c.name, &c);
      }
  }
  