Fix to support REST top-level del from pim/global for RP alone config

translib/transformer/xfmr_pim.go

@@ -1354,6 +1354,21 @@ func hdl_post_xfmr_pim_rp_address_del_(inParams *XfmrParams, niName string, retD
 	log.Info("After PIM Post-Transformer PIM_GLOBALS_RENDEZVOUS_POINT handler ==> retDbDataMap : ", (*retDbDataMap))
 }
 
+func pim_add_null_null_attr_to_pim_globals(pimGblKey string, inParams *XfmrParams) {
+	resMap := make(map[string]map[string]db.Value)
+	pimGblMap := make(map[string]db.Value)
+	pimGblMap[pimGblKey] = db.Value{Field: map[string]string{}}
+	resMap["PIM_GLOBALS"] = pimGblMap
+
+	if inParams.subOpDataMap[UPDATE] != nil && (*inParams.subOpDataMap[UPDATE])[db.ConfigDB] != nil {
+		mapCopy((*inParams.subOpDataMap[UPDATE])[db.ConfigDB], resMap)
+	} else {
+		subOpMap := make(map[db.DBNum]map[string]map[string]db.Value)
+		subOpMap[db.ConfigDB] = resMap
+		inParams.subOpDataMap[UPDATE] = &subOpMap
+	}
+}
+
 func pim_hdl_post_xfmr(inParams *XfmrParams, retDbDataMap *map[string]map[string]db.Value) error {
 	var err error
 
@@ -1399,6 +1414,42 @@ func pim_hdl_post_xfmr(inParams *XfmrParams, retDbDataMap *map[string]map[string
 		}
 	}
 
+	/*
+		For REST-delete @ URI: pim/global to cleanup rendezvous-points as well along with other pim/global containers,
+		PIM_GLOBALS table is expected to have a valid entry in DB. But attributes directly under PIM_GLOBALS are not mandatory.
+		To fix those cases,
+			(1) Adding NULL/NULL attribute to PIM_GLOBALS entry on PIM_GLOBALS_RENDEZVOUS_POINT CRU. This addition internally creates
+				the PIM_GLOBALS entry, if not present in DB
+			(2) Internally adding NULL/NULL attribute to the PIM_GLOBALS entry on leaf delete to
+				make sure PIM_GLOBALS entry is not deleted by infra-code on last-leaf delete.
+	*/
+	if (inParams.oper == CREATE || inParams.oper == REPLACE || inParams.oper == UPDATE) && (retDbDataMap != nil) {
+		depTblsNeedClnup := []string{"PIM_GLOBALS_RENDEZVOUS_POINT"} /* Add future tables under pim/global container to this list */
+		if _, ok := (*retDbDataMap)["PIM_GLOBALS"]; !ok {
+			addedPimGblKeys := make(map[string]bool)
+			for _, depTbl := range depTblsNeedClnup {
+				if depTblData, ok := (*retDbDataMap)[depTbl]; ok {
+					for depTblKey := range depTblData {
+						keyPtrn := strings.Split(depTblKey, "|")
+						pimGblKey := keyPtrn[0] + "|" + keyPtrn[1]
+						if _, ok := addedPimGblKeys[pimGblKey]; !ok {
+							pim_add_null_null_attr_to_pim_globals(pimGblKey, inParams)
+							addedPimGblKeys[pimGblKey] = true
+						}
+					}
+				}
+			}
+		}
+	} else if (inParams.oper == DELETE) && (inParams.dbDataMap != nil) {
+		if pimGblData, ok := (*inParams.dbDataMap)[db.ConfigDB]["PIM_GLOBALS"]; ok {
+			for pimGblKey := range pimGblData {
+				if pimGblVal, ok := pimGblData[pimGblKey]; ok && (len(pimGblVal.Field) > 0) {
+					pim_add_null_null_attr_to_pim_globals(pimGblKey, inParams)
+				}
+			}
+		}
+	}
+
 	return err
 }