fix dns failed > 3 ,App Will Quit

src/main.cpp

@@ -359,7 +359,7 @@ int main(int argc,char *argv[])
     }
     else {
         g_init_data = "{ \"fm_cmd\":1000,\"storeId\":\"" + pos_config_storeid + "\",\"pos_id\":\"" + std::to_string(pos_config_posid)
-            + "\",\"operator_id\":\"zouwuyang\",\"business_date\":\"20211015\",\"is_master\":" + pos_config_ismaster + " ,\"plugin_comment\":\"" + g_plugin_comment +
+            + "\",\"operator_id\":\"zouwuyang\",\"business_date\":\"20220401\",\"is_master\":" + pos_config_ismaster + " ,\"plugin_comment\":\"" + g_plugin_comment +
             + "\",\"version\":\"" + VERSION + "\",\"listen_port\":24445 }";
     }
     
@@ -432,6 +432,9 @@ int main(int argc,char *argv[])
         // 当  插件 与 ODS 的长连接无效时;  
         // ①插件将重连 ODS: ip+port;  ②与ODS建立连接后 发送登录初始化请求报文 完成登录;  ③登录成功后 接受ODS推送到插件上的请求数据
         if( !longConnectionOds.isValid() ) {
+            // 长连接断开重连时, 重新解析 域名映射地址;
+            ods_ip = ZIni::readString("ODS", "ip", "", strIniPath.c_str());
+            getIpByDns(ods_ip);
 
             // ①插件将重连 ODS : ip + port  成功;
             if ( longConnectionOds.doConnect( ods_push_port,  ods_ip.c_str() ) )  {
@@ -487,7 +490,6 @@ int main(int argc,char *argv[])
                         waitPosInitReqTimeOutCount++;
                     }
                     os_sleep(10);
-
                     if ( waitPosInitReqTimeOutCount < 6 ) {
                         continue; //Continue / break; 6次超时(60s) 内都继续本循环; 超过6次超时(60s) 将退出本循环，进入上一层循环进行重新连接Ods的 ip+ port;
                     } else {
@@ -508,20 +510,21 @@ int main(int argc,char *argv[])
         if(!bPriorityDone){
             LOG(INFO)<<"ODS set priority send:"<<g_set_pos_priority.data();
 
-            if(longConnectionOds.send(g_set_pos_priority) ) {
+            if(longConnectionOds.send(g_set_pos_priority ) ) {
                 longConnectionOds.receive(odsPushData);
                 g_set_pos_priority_ods_back=odsPushData;
                 LOG(INFO)<<"ODS set priority back:"<<odsPushData.data();
             }
         }
 
+        // Recv ODS Request Command From Liston Long Connection;
         // ③登录成功后 接受ODS推送到插件上的请求数据
         if(longConnectionOds.receive(odsPushData) ) {
             LOG(INFO) << "---------------- ODS ===>> PLUGIN  ---------------";
             LOG(INFO) << odsPushData;
             int dataType=jsonTool.isHeartbeatData(odsPushData.data());
 
-            if(2==dataType){
+            if ( 2==dataType ) { //ODS Push Order Data ReqCommand;
 
                 if( jsonTool.convertDataOds2Pos(odsPushData, pushPosData) ) {
                     LOG(INFO) << "----------- PLUGIN ===>> POS ------------";
@@ -547,23 +550,24 @@ int main(int argc,char *argv[])
                 } else {
                     jsonTool.getOdsResponseData(101, "convert data to [POS] format failed!", odsPushData, responseData);
                 }
+                // Direct Return Pos Response To Ods Request;
                 LOG(INFO) << "PLUGIN ===>> ODS:"<<responseData.data();
 
                 bool rlt = longConnectionOds.send(responseData);
                 LOG(INFO)<<"send to ods result:"<<rlt;
 
-            } else if(1==dataType) {
+            } else if ( 1==dataType ) {  //ODS Send Heartbeat ReqCommand;
 
-                if(!bInitDone){
+                if ( !bInitDone ) {
                     longConnectionOds.setValid(false);
                     LOG(INFO)<<"maybe pos restart,reconnect!!!";
                 }
 
-            } else if(3==dataType){
+            } else if ( 3==dataType ) { //ODS Undefine ReqCommand;
                 LOG(INFO)<<"illegal data!!";
             }
 
-        } else {
+        } else {  // Long Connect Recv Failed;
             longConnectionOds.close();
             os_sleep(2); //防止在ods挂掉后狂刷日志
             LOG(INFO) << "recv ODS pushData failed or timeout";
@@ -622,6 +626,7 @@ bool order_send_to_pos(IN std::string &order_json,IN std::string &ods_json,OUT s
     jsonTool.getOdsResponseData(tmp, order_json,ods_json, back_json);
     
     return rlt;
+
 }
 
 
@@ -631,8 +636,8 @@ void getIpByDns(IN std::string &ods_ip) {
         LOG(INFO) << "DNS Resolve IP Begin , Origin ods_ip: " << ods_ip.c_str();
         struct hostent* pHost = NULL;
         bool bGetDnsRet = false;
-
-        for (int n = 0; n < 3; n++) {
+        // 需考虑POS机断网后，域名解析会频繁失败，频繁失败,插件有退出程序的可能，故在此进行类似死循环处理，插件永不主动退出;
+        for (int n = 0; n < n + 3 ; n++) {
             pHost = gethostbyname(ods_ip.c_str());
             if (!pHost) {
                 LOG(INFO) << "DNS Resolve Failed: ods domain name: " << n << " " << ods_ip.c_str();