[TD-2502]<feature>: force version checking with rpc request messages

src/inc/taoserror.h

@@ -67,6 +67,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_RESPONSE_TYPE,    0, 0x0012, "Invalid re
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_TIME_STAMP,       0, 0x0013, "Client and server's time is not synchronized")
 TAOS_DEFINE_ERROR(TSDB_CODE_APP_NOT_READY,                0, 0x0014, "Database not ready")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_FQDN_ERROR,               0, 0x0015, "Unable to resolve FQDN")
+TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_VERSION,          0, 0x0016, "Invalid app version")
 
 //common & util
 TAOS_DEFINE_ERROR(TSDB_CODE_COM_OPS_NOT_SUPPORT,          0, 0x0100, "Operation not supported")

src/rpc/inc/rpcHead.h

@@ -58,6 +58,7 @@ typedef struct {
   char     empty[1];  // reserved
   uint8_t  msgType;   // message type  
   int32_t  msgLen;    // message length including the header iteslf
+  uint32_t msgVer;
   int32_t  code;      // code in response message
   uint8_t  content[0]; // message body starts from here
 } SRpcHead;

src/rpc/src/rpcMain.c

@@ -959,6 +959,11 @@ static SRpcConn *rpcProcessMsgHead(SRpcInfo *pRpc, SRecvInfo *pRecv, SRpcReqCont
     terrno = TSDB_CODE_RPC_INVALID_SESSION_ID; return NULL;
   }
 
+  if (rpcIsReq(pHead->msgType) && htonl(pHead->msgVer) != tsVersion >> 8) {
+    tDebug("%s sid:%d, invalid client version:%d", pRpc->label, sid, htonl(pHead->msgVer));
+    terrno = TSDB_CODE_RPC_INVALID_VERSION; return NULL;
+  }
+
   pConn = rpcGetConnObj(pRpc, sid, pRecv);
   if (pConn == NULL) {
     tDebug("%s %p, failed to get connection obj(%s)", pRpc->label, (void *)pHead->ahandle, tstrerror(terrno)); 
@@ -1282,6 +1287,7 @@ static void rpcSendReqToServer(SRpcInfo *pRpc, SRpcReqContext *pContext) {
 
   // set the message header  
   pHead->version = 1;
+  pHead->msgVer = htonl(tsVersion >> 8);
   pHead->msgType = msgType;
   pHead->encrypt = 0;
   pConn->tranId++;