[TD-5610]<enhance> Unable to Resolve FQDN

src/client/src/tscServer.c

@@ -501,6 +501,15 @@ static void doProcessMsgFromServer(SSchedMsg* pSchedMsg) {
       pRes->code = rpcMsg->code;
     }
     rpcMsg->code = (pRes->code == TSDB_CODE_SUCCESS) ? (int32_t)pRes->numOfRows : pRes->code;
+    if (pRes->code == TSDB_CODE_RPC_FQDN_ERROR) {
+      if (pEpSet) {
+        char buf[TSDB_FQDN_LEN + 64] = {0}; 
+        tscAllocPayload(pCmd, sizeof(buf)); 
+        sprintf(tscGetErrorMsgPayload(pCmd), "%s\"%s\"", tstrerror(pRes->code),pEpSet->fqdn[(pEpSet->inUse)%(pEpSet->numOfEps)]);
+      } else {
+        sprintf(tscGetErrorMsgPayload(pCmd), "%s", tstrerror(pRes->code));
+      } 
+    }
     (*pSql->fp)(pSql->param, pSql, rpcMsg->code);
   }
 

src/client/src/tscSql.c

@@ -196,6 +196,11 @@ TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass,
 
     if (pSql->res.code != TSDB_CODE_SUCCESS) {
       terrno = pSql->res.code;
+      if (terrno ==TSDB_CODE_RPC_FQDN_ERROR) {
+        printf("taos connect failed, reason: %s\n\n", taos_errstr(pSql));
+      } else {
+        printf("taos connect failed, reason: %s.\n\n", tstrerror(terrno));
+      }
       taos_free_result(pSql);
       taos_close(pObj);
       return NULL;
@@ -643,7 +648,7 @@ char *taos_errstr(TAOS_RES *tres) {
     return (char*) tstrerror(terrno);
   }
 
-  if (hasAdditionalErrorInfo(pSql->res.code, &pSql->cmd)) {
+  if (hasAdditionalErrorInfo(pSql->res.code, &pSql->cmd) || pSql->res.code == TSDB_CODE_RPC_FQDN_ERROR) {
     return pSql->cmd.payload;
   } else {
     return (char*)tstrerror(pSql->res.code);

src/kit/shell/src/shellEngine.c

@@ -98,7 +98,6 @@ TAOS *shellInit(SShellArguments *_args) {
   }
 
   if (con == NULL) {
-    printf("taos connect failed, reason: %s.\n\n", tstrerror(terrno));
     fflush(stdout);
     return con;
   }