enh: return NULL when epset not updated

source/libs/transport/inc/transComm.h

@@ -112,7 +112,8 @@ typedef struct SCvtAddr {
 } SCvtAddr;
 
 typedef struct {
-  SEpSet  epSet;     // ip list provided by app
+  SEpSet  epSet;  // ip list provided by app
+  SEpSet  origEpSet;
   void*   ahandle;   // handle provided by app
   tmsg_t  msgType;   // message type
   int8_t  connType;  // connection type cli/srv
@@ -344,6 +345,7 @@ void transDQDestroy(SDelayQueue* queue);
 int transDQSched(SDelayQueue* queue, void (*func)(void* arg), void* arg, uint64_t timeoutMs);
 
 void transPrintEpSet(SEpSet* pEpSet);
+bool transEpSetIsEqual(SEpSet* a, SEpSet* b);
 /*
  * init global func
  */

source/libs/transport/src/transCli.c

@@ -947,6 +947,9 @@ int cliAppCb(SCliConn* pConn, STransMsg* pResp, SCliMsg* pMsg) {
   SEpSet*        pEpSet = &pCtx->epSet;
   transPrintEpSet(pEpSet);
 
+  if (pCtx->retryCount == 0) {
+    pCtx->origEpSet = pCtx->epSet;
+  }
   /*
    * upper layer handle retry if code equal TSDB_CODE_RPC_NETWORK_UNAVAIL
    */
@@ -999,7 +1002,7 @@ int cliAppCb(SCliConn* pConn, STransMsg* pResp, SCliMsg* pMsg) {
     pCtx->pRsp = NULL;
   } else {
     tTrace("%s cli conn %p handle resp", pTransInst->label, pConn);
-    if (pResp->code != 0) {
+    if (pResp->code != 0 || pCtx->retryCount == 0 || transEpSetIsEqual(&pCtx->epSet, &pCtx->origEpSet)) {
       pTransInst->cfp(pTransInst->parent, pResp, NULL);
     } else {
       pTransInst->cfp(pTransInst->parent, pResp, pEpSet);

source/libs/transport/src/transComm.c

@@ -453,10 +453,21 @@ void transPrintEpSet(SEpSet* pEpSet) {
     tTrace("NULL epset");
     return;
   }
-  tTrace("epset begin: inUse: %d", pEpSet->inUse);
+  tTrace("epset begin  inUse: %d", pEpSet->inUse);
   for (int i = 0; i < pEpSet->numOfEps; i++) {
     tTrace("ip: %s, port: %d", pEpSet->eps[i].fqdn, pEpSet->eps[i].port);
   }
   tTrace("epset end");
 }
+bool transEpSetIsEqual(SEpSet* a, SEpSet* b) {
+  if (a->numOfEps != b->numOfEps || a->inUse != b->inUse) {
+    return false;
+  }
+  for (int i = 0; i < a->numOfEps; i++) {
+    if (strncmp(a->eps[i].fqdn, b->eps[i].fqdn, TSDB_FQDN_LEN) != 0 || a->eps[i].port != b->eps[i].port) {
+      return false;
+    }
+  }
+  return true;
+}
 #endif