add connected external ip for mpc service (#125)

Author: ywy2090

cpp/wedpr-helper/ppc-tools/src/config/PPCConfig.cpp

@@ -667,8 +667,12 @@ void PPCConfig::loadMPCConfig(boost::property_tree::ptree const& _pt)
     m_mpcConfig.mpcRootPathNoGateway = _pt.get<std::string>("mpc.mpc_root_path_no_gateway", "./");
     m_mpcConfig.readPerBatchLines = _pt.get<std::uint64_t>("mpc.read_per_batch_lines", 100000);
     m_mpcConfig.spdzConnectedPort = _pt.get<int>("spdz.connected_port", 5894);
-    m_mpcConfig.spdzConnectedIP = _pt.get<std::string>("transport.host_ip", "");
 
+    m_mpcConfig.spdzConnectedIP = _pt.get<std::string>("transport.connected_external_ip", "");
+    if (m_mpcConfig.spdzConnectedIP.empty()) {
+        m_mpcConfig.spdzConnectedIP = _pt.get<std::string>("transport.host_ip", "");
+    }
+
     PPCConfig_LOG(INFO) << LOG_DESC("spdzConnectedPort") << LOG_KV("spdzConnectedIP", m_mpcConfig.spdzConnectedIP) << LOG_KV("spdzConnectedPort", m_mpcConfig.spdzConnectedPort);
 
     m_mpcConfig.threadPoolSize = _pt.get<int>("mpc.async_thread_pool_size", -1);