shamrickus commented on code in PR #7605:
URL: https://github.com/apache/trafficcontrol/pull/7605#discussion_r1280850318


##########
CHANGELOG.md:
##########
@@ -135,6 +136,7 @@ The format is based on [Keep a 
Changelog](http://keepachangelog.com/en/1.0.0/).
 - [#7425](https://github.com/apache/trafficcontrol/pull/7425) *Traffic Control 
Cache Config (t3c)* Fixed issue with layered profile iteration being done in 
the wrong order.
 - [#6385](https://github.com/apache/trafficcontrol/issues/6385) *Traffic Ops* 
Reserved consistentHashQueryParameters cause internal server error
 - [#7471](https://github.com/apache/trafficcontrol/pull/7471) *Traffic Control 
Cache Config (t3c)* Fixed issue with MSO non topo origins from multiple cache 
groups.
+- [#4393](https://github.com/apache/trafficcontrol/issues/4393) *Traffic Ops* 
Fixed the error code and alert structure when TO is queried for a delivery 
service with no ssl keys.

Review Comment:
   Bad merge perhaps? This isn't related to the PR so maybe it was duplicated?



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {

Review Comment:
   Commented line should be removed.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))

Review Comment:
   Since `cg.Name` is a pointer this will print out the address instead of the 
cachegroup name, since the cachegroup has already been validated you just need 
to dereference e.g. `*cg.Name`



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {

Review Comment:
   Since this function is only used internally, it should be `getCacheGroup`.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {

Review Comment:
   nit: This should be GetCacheGroup to match the naming convention setup with 
the other endpoints.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))
+       api.WriteAlertsObj(w, r, http.StatusCreated, alerts, cg)
+       return
+}
+
+// UpdateCacheGroup [Version : V5] function updates the name of the cache 
group passed.
+func UpdateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       // check if the entity was already updated
+       userErr, sysErr, errCode = api.CheckIfUnModified(r.Header, inf.Tx, id, 
"cachegroup")
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+
+       keyFields := dgCg.GetKeyFieldsInfo() //expecting a slice of the key 
fields info which is a struct with the field name and a function to convert a 
string into a {}interface of the right type. in most that will be 
[{Field:"id",Func: func(s string)({}interface,error){return strconv.Atoi(s)}}]
+       // ignoring ok value -- will be checked after param processing
+
+       keys := make(map[string]interface{}) // a map of keyField to keyValue 
where keyValue is an {}interface
+       for _, kf := range keyFields {
+               paramKey := inf.Params[kf.Field]
+               if paramKey == "" {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("missing key: "+kf.Field), nil)
+                       return
+               }
+
+               paramValue, err := kf.Func(paramKey)
+               if err != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("failed to parse key: "+kf.Field), nil)
+                       return
+               }
+
+               if paramValue != "" {
+                       // if key's value provided in params,  overwrite it and 
ignore that provided in JSON
+                       keys[kf.Field] = paramValue
+               }
+       }
+
+       // check that all keys were properly filled in
+       dgCg.SetKeys(keys)
+       _, ok := dgCg.GetKeys()
+       if !ok {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("unable to parse required keys from request body"), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(dgCg.ReqInfo.Tx.Tx, *dgCg.ID, 
dgCg.ReqInfo.User.UserName)
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+userErr.Error()), userErr)
+               return
+       }
+
+       coordinateID, userErr, sysErr, errCode := dgCg.handleCoordinateUpdate()
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+userErr.Error()), userErr)
+               return
+       }
+
+       err = dgCg.ValidateTypeInTopology()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("update cachegroup: validating type in topology: "+err.Error()), err)
+               return
+       }
+
+       //update cache group
+       query := UpdateQuery()
+
+       err = tx.QueryRow(
+               query,
+               dgCg.Name,
+               dgCg.ShortName,
+               coordinateID,
+               dgCg.ParentCachegroupID,
+               dgCg.SecondaryParentCachegroupID,
+               dgCg.TypeID,
+               dgCg.FallbackToClosest,
+               dgCg.ID,
+       ).Scan(
+               &dgCg.Type,
+               &dgCg.ParentName,
+               &dgCg.SecondaryParentName,
+               &dgCg.LastUpdated,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusNotFound, 
fmt.Errorf("cache group with name: %s not found", dgCg.Name), nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was updated")
+       api.WriteAlertsObj(w, r, http.StatusOK, alerts, cg)
+       return
+}
+
+// DeleteCacheGroup [Version : V5] function deletes the cache group passed.
+func DeleteCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       tx := inf.Tx.Tx
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       inUse, err := isUsed(inf.Tx, id)
+       if inUse {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, nil, nil)
+               return
+       }
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: checking use: "+err.Error()), nil)
+               return
+       }
+
+       coordinateID, err := dbhelpers.GetCoordinateID(inf.Tx.Tx, id)
+       if err == sql.ErrNoRows {
+               api.HandleErr(w, r, tx, http.StatusNotFound, fmt.Errorf("no 
cachegroup with that id found"), nil)
+               return
+       }
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: deleting cachegroup: "+err.Error()), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(inf.Tx.Tx, id, 
inf.User.UserName)
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("cachegroup delete: 
getting coord: "+userErr.Error()), nil)
+               return
+       }
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("cachegroup delete: 
getting coord: "+sysErr.Error()), nil)
+               return
+       }
+
+       if err = dbhelpers.DeleteCoordinate(inf.Tx.Tx, id, *coordinateID); err 
!= nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: deleting coord: "+err.Error()), nil)
+               return
+       }
+
+       res, err := tx.Exec("DELETE FROM cachegroup AS cg WHERE cg.ID=$1", ID)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
err)
+               return
+       }
+       rowsAffected, err := res.RowsAffected()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("determining rows affected for delete cachegroup: %w", err))
+               return
+       }
+       if rowsAffected == 0 {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("no rows deleted for cachegroup"))
+               return
+       }
+
+       alertMessage := fmt.Sprintf("%s was deleted.", ID)
+       alerts := tc.CreateAlerts(tc.SuccessLevel, alertMessage)
+       api.WriteAlerts(w, r, http.StatusOK, alerts)
+       return
+}
+
+// readAndValidateJsonStruct populates select missing fields and validates 
JSON body
+func readAndValidateJsonStruct(r *http.Request) (tc.CacheGroupNullableV5, 
error) {
+       var cg tc.CacheGroupNullableV5
+       if err := json.NewDecoder(r.Body).Decode(&cg); err != nil {
+               userErr := fmt.Errorf("error decoding POST request body into 
CacheGroupV5 struct %w", err)
+               return cg, userErr
+       }
+
+       if cg.Latitude == nil {
+               cg.Latitude = util.FloatPtr(0.0)

Review Comment:
   Should be `util.Ptr` since generics were added.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}

Review Comment:
   Commented line should be removed.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)

Review Comment:
   Since `cg.Name` is a pointer this will print out the address instead of the 
cachegroup name, since the cachegroup has already been validated you just need 
to dereference e.g. `*cg.Name`



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))

Review Comment:
   Since `cg.Name` is a pointer this will print out the address instead of the 
cachegroup name, since the cachegroup has already been validated you just need 
to dereference e.g. `*cg.Name`



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))
+       api.WriteAlertsObj(w, r, http.StatusCreated, alerts, cg)
+       return
+}
+
+// UpdateCacheGroup [Version : V5] function updates the name of the cache 
group passed.
+func UpdateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       // check if the entity was already updated
+       userErr, sysErr, errCode = api.CheckIfUnModified(r.Header, inf.Tx, id, 
"cachegroup")
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+
+       keyFields := dgCg.GetKeyFieldsInfo() //expecting a slice of the key 
fields info which is a struct with the field name and a function to convert a 
string into a {}interface of the right type. in most that will be 
[{Field:"id",Func: func(s string)({}interface,error){return strconv.Atoi(s)}}]
+       // ignoring ok value -- will be checked after param processing
+
+       keys := make(map[string]interface{}) // a map of keyField to keyValue 
where keyValue is an {}interface
+       for _, kf := range keyFields {
+               paramKey := inf.Params[kf.Field]
+               if paramKey == "" {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("missing key: "+kf.Field), nil)
+                       return
+               }
+
+               paramValue, err := kf.Func(paramKey)
+               if err != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("failed to parse key: "+kf.Field), nil)
+                       return
+               }
+
+               if paramValue != "" {
+                       // if key's value provided in params,  overwrite it and 
ignore that provided in JSON
+                       keys[kf.Field] = paramValue
+               }
+       }
+
+       // check that all keys were properly filled in
+       dgCg.SetKeys(keys)
+       _, ok := dgCg.GetKeys()
+       if !ok {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("unable to parse required keys from request body"), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(dgCg.ReqInfo.Tx.Tx, *dgCg.ID, 
dgCg.ReqInfo.User.UserName)
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+userErr.Error()), userErr)
+               return
+       }
+
+       coordinateID, userErr, sysErr, errCode := dgCg.handleCoordinateUpdate()
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+userErr.Error()), userErr)
+               return
+       }
+
+       err = dgCg.ValidateTypeInTopology()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("update cachegroup: validating type in topology: "+err.Error()), err)
+               return
+       }
+
+       //update cache group
+       query := UpdateQuery()
+
+       err = tx.QueryRow(
+               query,
+               dgCg.Name,
+               dgCg.ShortName,
+               coordinateID,
+               dgCg.ParentCachegroupID,
+               dgCg.SecondaryParentCachegroupID,
+               dgCg.TypeID,
+               dgCg.FallbackToClosest,
+               dgCg.ID,
+       ).Scan(
+               &dgCg.Type,
+               &dgCg.ParentName,
+               &dgCg.SecondaryParentName,
+               &dgCg.LastUpdated,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusNotFound, 
fmt.Errorf("cache group with name: %s not found", dgCg.Name), nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was updated")
+       api.WriteAlertsObj(w, r, http.StatusOK, alerts, cg)
+       return
+}
+
+// DeleteCacheGroup [Version : V5] function deletes the cache group passed.
+func DeleteCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       tx := inf.Tx.Tx
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       inUse, err := isUsed(inf.Tx, id)
+       if inUse {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, nil, nil)
+               return
+       }
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: checking use: "+err.Error()), nil)
+               return
+       }
+
+       coordinateID, err := dbhelpers.GetCoordinateID(inf.Tx.Tx, id)
+       if err == sql.ErrNoRows {
+               api.HandleErr(w, r, tx, http.StatusNotFound, fmt.Errorf("no 
cachegroup with that id found"), nil)
+               return
+       }
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: deleting cachegroup: "+err.Error()), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(inf.Tx.Tx, id, 
inf.User.UserName)
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("cachegroup delete: 
getting coord: "+userErr.Error()), nil)
+               return
+       }
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("cachegroup delete: 
getting coord: "+sysErr.Error()), nil)
+               return
+       }
+
+       if err = dbhelpers.DeleteCoordinate(inf.Tx.Tx, id, *coordinateID); err 
!= nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup delete: deleting coord: "+err.Error()), nil)
+               return
+       }
+
+       res, err := tx.Exec("DELETE FROM cachegroup AS cg WHERE cg.ID=$1", ID)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
err)
+               return
+       }
+       rowsAffected, err := res.RowsAffected()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("determining rows affected for delete cachegroup: %w", err))
+               return
+       }
+       if rowsAffected == 0 {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("no rows deleted for cachegroup"))
+               return
+       }
+
+       alertMessage := fmt.Sprintf("%s was deleted.", ID)
+       alerts := tc.CreateAlerts(tc.SuccessLevel, alertMessage)
+       api.WriteAlerts(w, r, http.StatusOK, alerts)
+       return
+}
+
+// readAndValidateJsonStruct populates select missing fields and validates 
JSON body
+func readAndValidateJsonStruct(r *http.Request) (tc.CacheGroupNullableV5, 
error) {
+       var cg tc.CacheGroupNullableV5
+       if err := json.NewDecoder(r.Body).Decode(&cg); err != nil {
+               userErr := fmt.Errorf("error decoding POST request body into 
CacheGroupV5 struct %w", err)
+               return cg, userErr
+       }
+
+       if cg.Latitude == nil {
+               cg.Latitude = util.FloatPtr(0.0)
+       }
+       if cg.Longitude == nil {
+               cg.Longitude = util.FloatPtr(0.0)

Review Comment:
   Should be `util.Ptr` since generics were added.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))
+       api.WriteAlertsObj(w, r, http.StatusCreated, alerts, cg)
+       return
+}
+
+// UpdateCacheGroup [Version : V5] function updates the name of the cache 
group passed.
+func UpdateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)

Review Comment:
   Unhandled error.



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)

Review Comment:
   Since `cg.Name` is a pointer this will print out the address instead of the 
cachegroup name, since the cachegroup has already been validated you just need 
to dereference e.g. `*cg.Name`



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))
+       api.WriteAlertsObj(w, r, http.StatusCreated, alerts, cg)
+       return
+}
+
+// UpdateCacheGroup [Version : V5] function updates the name of the cache 
group passed.
+func UpdateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       // check if the entity was already updated
+       userErr, sysErr, errCode = api.CheckIfUnModified(r.Header, inf.Tx, id, 
"cachegroup")
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+
+       keyFields := dgCg.GetKeyFieldsInfo() //expecting a slice of the key 
fields info which is a struct with the field name and a function to convert a 
string into a {}interface of the right type. in most that will be 
[{Field:"id",Func: func(s string)({}interface,error){return strconv.Atoi(s)}}]
+       // ignoring ok value -- will be checked after param processing
+
+       keys := make(map[string]interface{}) // a map of keyField to keyValue 
where keyValue is an {}interface
+       for _, kf := range keyFields {
+               paramKey := inf.Params[kf.Field]
+               if paramKey == "" {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("missing key: "+kf.Field), nil)
+                       return
+               }
+
+               paramValue, err := kf.Func(paramKey)
+               if err != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("failed to parse key: "+kf.Field), nil)
+                       return
+               }
+
+               if paramValue != "" {
+                       // if key's value provided in params,  overwrite it and 
ignore that provided in JSON
+                       keys[kf.Field] = paramValue
+               }
+       }
+
+       // check that all keys were properly filled in
+       dgCg.SetKeys(keys)
+       _, ok := dgCg.GetKeys()
+       if !ok {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("unable to parse required keys from request body"), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(dgCg.ReqInfo.Tx.Tx, *dgCg.ID, 
dgCg.ReqInfo.User.UserName)
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+userErr.Error()), userErr)
+               return
+       }
+
+       coordinateID, userErr, sysErr, errCode := dgCg.handleCoordinateUpdate()
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+userErr.Error()), userErr)
+               return
+       }
+
+       err = dgCg.ValidateTypeInTopology()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("update cachegroup: validating type in topology: "+err.Error()), err)
+               return
+       }
+
+       //update cache group
+       query := UpdateQuery()
+
+       err = tx.QueryRow(
+               query,
+               dgCg.Name,
+               dgCg.ShortName,
+               coordinateID,
+               dgCg.ParentCachegroupID,
+               dgCg.SecondaryParentCachegroupID,
+               dgCg.TypeID,
+               dgCg.FallbackToClosest,
+               dgCg.ID,
+       ).Scan(
+               &dgCg.Type,
+               &dgCg.ParentName,
+               &dgCg.SecondaryParentName,
+               &dgCg.LastUpdated,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusNotFound, 
fmt.Errorf("cache group with name: %s not found", dgCg.Name), nil)

Review Comment:
   Since `cg.Name` is a pointer this will print out the address instead of the 
cachegroup name, since the cachegroup has already been validated you just need 
to dereference e.g. `*cg.Name`



##########
traffic_ops/traffic_ops_golang/cachegroup/cachegroups.go:
##########
@@ -897,3 +955,483 @@ last_updated`
 func DeleteQuery() string {
        return `DELETE FROM cachegroup WHERE id=$1`
 }
+
+// Get [Version : V5] function Process the *http.Request and writes the 
response. It uses GetCacheGroup function.
+func Get(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       code := http.StatusOK
+       useIMS := false
+       config, e := api.GetConfig(r.Context())
+       if e == nil && config != nil {
+               useIMS = config.UseIMS
+       } else {
+               log.Warnf("Couldn't get config %v", e)
+       }
+
+       var maxTime time.Time
+       var usrErr error
+       var syErr error
+
+       var cgList []interface{}
+
+       tx := inf.Tx
+
+       cgList, maxTime, code, usrErr, syErr = GetCacheGroup(tx, inf.Params, 
useIMS, r.Header)
+       if code == http.StatusNotModified {
+               w.WriteHeader(code)
+               api.WriteResp(w, r, []tc.CacheGroupV5{})
+               return
+       }
+
+       if code == http.StatusBadRequest {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, usrErr, 
nil)
+               return
+       }
+
+       if sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, 
nil, syErr)
+               return
+       }
+
+       if maxTime != (time.Time{}) && api.SetLastModifiedHeader(r, useIMS) {
+               api.AddLastModifiedHdr(w, maxTime)
+       }
+
+       api.WriteResp(w, r, cgList)
+}
+
+// GetCacheGroup [Version : V5] receives transactions from Get function and 
returns cache groups list.
+func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS bool, header 
http.Header) ([]interface{}, time.Time, int, error, error) {
+       //func GetCacheGroup(tx *sqlx.Tx, params map[string]string, useIMS 
bool, header http.Header) ([]tc.CacheGroupV5, time.Time, int, error, error) {
+       var runSecond bool
+       var maxTime time.Time
+       cgList := []interface{}{}
+       //cgList := []tc.CacheGroupV5{}
+
+       // Query Parameters to Database Query column mappings
+       queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
+               "id":        {Column: "cachegroup.id", Checker: api.IsInt},
+               "name":      {Column: "cachegroup.name"},
+               "shortName": {Column: "cachegroup.short_name"},
+               "type":      {Column: "cachegroup.type"},
+               "topology":  {Column: "topology_cachegroup.topology"},
+       }
+       if _, ok := params["orderby"]; !ok {
+               params["orderby"] = "name"
+       }
+       where, orderBy, pagination, queryValues, errs := 
dbhelpers.BuildWhereAndOrderByAndPagination(params, queryParamsToQueryCols)
+       if len(errs) > 0 {
+               return nil, time.Time{}, http.StatusBadRequest, 
util.JoinErrs(errs), nil
+       }
+
+       if useIMS {
+               runSecond, maxTime = ims.TryIfModifiedSinceQuery(tx, header, 
queryValues, selectMaxLastUpdatedQuery(where))
+               if !runSecond {
+                       log.Debugln("IMS HIT")
+                       return cgList, maxTime, http.StatusNotModified, nil, nil
+               }
+               log.Debugln("IMS MISS")
+       } else {
+               log.Debugln("Non IMS request")
+       }
+       baseSelect := SelectQuery()
+       if _, ok := params["topology"]; ok {
+               baseSelect += `
+               LEFT JOIN topology_cachegroup ON cachegroup.name = 
topology_cachegroup.cachegroup
+               `
+       }
+       // If the type cannot be converted to an int, return 400
+       if cgType, ok := params["type"]; ok {
+               _, err := strconv.Atoi(cgType)
+               if err != nil {
+                       return nil, time.Time{}, http.StatusBadRequest, nil, 
fmt.Errorf("cachegroup read: converting cachegroup type to integer " + 
err.Error())
+               }
+       }
+
+       query := baseSelect + where + orderBy + pagination
+       rows, err := tx.NamedQuery(query, queryValues)
+       if err != nil {
+               return nil, time.Time{}, http.StatusInternalServerError, nil, 
err
+       }
+       defer rows.Close()
+
+       for rows.Next() {
+               var cg TOCacheGroupV5
+               lms := make([]tc.LocalizationMethod, 0)
+               cgfs := make([]string, 0)
+               if err = rows.Scan(
+                       &cg.ID,
+                       &cg.Name,
+                       &cg.ShortName,
+                       &cg.Latitude,
+                       &cg.Longitude,
+                       pq.Array(&lms),
+                       &cg.ParentCachegroupID,
+                       &cg.ParentName,
+                       &cg.SecondaryParentCachegroupID,
+                       &cg.SecondaryParentName,
+                       &cg.Type,
+                       &cg.TypeID,
+                       &cg.LastUpdated,
+                       pq.Array(&cgfs),
+                       &cg.FallbackToClosest,
+               ); err != nil {
+                       return nil, time.Time{}, 
http.StatusInternalServerError, nil, err
+               }
+               cg.LocalizationMethods = &lms
+               cg.Fallbacks = &cgfs
+               cgList = append(cgList, cg)
+       }
+
+       return cgList, maxTime, http.StatusOK, nil, nil
+}
+
+// CreateCacheGroup [Version : V5] function creates the cache group with the 
passed name.
+func CreateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       // check if cache group already exists
+       var exists bool
+       err := tx.QueryRow(`SELECT EXISTS(SELECT * from cachegroup where name = 
$1)`, cg.Name).Scan(&exists)
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("error: %w, when checking if cache group with name %s exists", err, 
cg.Name))
+               return
+       }
+       if exists {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("cache group name '%s' already exists.", cg.Name), nil)
+               return
+       }
+
+       // create cache group
+       query := InsertQuery()
+
+       err = tx.QueryRow(
+               query,
+               cg.Name,
+               cg.ShortName,
+               cg.TypeID,
+               cg.ParentCachegroupID,
+               cg.SecondaryParentCachegroupID,
+               cg.FallbackToClosest,
+       ).Scan(
+               &cg.ID,
+               &cg.Type,
+               &cg.ParentName,
+               &cg.SecondaryParentName,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("error: %w in creating cache group with name: %s", err, cg.Name), 
nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+       coordinateID, err := dgCg.createCoordinate()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("cachegroup create: creating coord: "+err.Error()), nil)
+               return
+       }
+
+       checkLastUpdated := `UPDATE cachegroup SET coordinate=$1 WHERE id=$2 
RETURNING last_updated`
+
+       err = tx.QueryRow(
+               checkLastUpdated,
+               coordinateID,
+               *cg.ID,
+       ).Scan(
+               &cg.LastUpdated,
+       )
+
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("followup update during cachegroup create: %v", err), nil)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was created.")
+       w.Header().Set("Location", 
fmt.Sprintf("/api/%d.%d/cachegroups?name=%s", inf.Version.Major, 
inf.Version.Minor, cg.Name))
+       api.WriteAlertsObj(w, r, http.StatusCreated, alerts, cg)
+       return
+}
+
+// UpdateCacheGroup [Version : V5] function updates the name of the cache 
group passed.
+func UpdateCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+       tx := inf.Tx.Tx
+
+       cg, readValErr := readAndValidateJsonStruct(r)
+       if readValErr != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, readValErr, nil)
+               return
+       }
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)
+
+       // check if the entity was already updated
+       userErr, sysErr, errCode = api.CheckIfUnModified(r.Header, inf.Tx, id, 
"cachegroup")
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+
+       dgCg := Downgrade(cg)
+       dgCg.ReqInfo = inf
+
+       keyFields := dgCg.GetKeyFieldsInfo() //expecting a slice of the key 
fields info which is a struct with the field name and a function to convert a 
string into a {}interface of the right type. in most that will be 
[{Field:"id",Func: func(s string)({}interface,error){return strconv.Atoi(s)}}]
+       // ignoring ok value -- will be checked after param processing
+
+       keys := make(map[string]interface{}) // a map of keyField to keyValue 
where keyValue is an {}interface
+       for _, kf := range keyFields {
+               paramKey := inf.Params[kf.Field]
+               if paramKey == "" {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("missing key: "+kf.Field), nil)
+                       return
+               }
+
+               paramValue, err := kf.Func(paramKey)
+               if err != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("failed to parse key: "+kf.Field), nil)
+                       return
+               }
+
+               if paramValue != "" {
+                       // if key's value provided in params,  overwrite it and 
ignore that provided in JSON
+                       keys[kf.Field] = paramValue
+               }
+       }
+
+       // check that all keys were properly filled in
+       dgCg.SetKeys(keys)
+       _, ok := dgCg.GetKeys()
+       if !ok {
+               api.HandleErr(w, r, inf.Tx.Tx, http.StatusBadRequest, 
errors.New("unable to parse required keys from request body"), nil)
+               return
+       }
+
+       // check if user can modify cache group
+       userErr, sysErr, errCode = 
dbhelpers.CheckIfCurrentUserCanModifyCachegroup(dgCg.ReqInfo.Tx.Tx, *dgCg.ID, 
dgCg.ReqInfo.User.UserName)
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
checking if user can modify: "+userErr.Error()), userErr)
+               return
+       }
+
+       coordinateID, userErr, sysErr, errCode := dgCg.handleCoordinateUpdate()
+       if sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+sysErr.Error()), sysErr)
+               return
+       }
+       if userErr != nil {
+               api.HandleErr(w, r, tx, errCode, fmt.Errorf("update cachegroup: 
updating coordinate: "+userErr.Error()), userErr)
+               return
+       }
+
+       err = dgCg.ValidateTypeInTopology()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("update cachegroup: validating type in topology: "+err.Error()), err)
+               return
+       }
+
+       //update cache group
+       query := UpdateQuery()
+
+       err = tx.QueryRow(
+               query,
+               dgCg.Name,
+               dgCg.ShortName,
+               coordinateID,
+               dgCg.ParentCachegroupID,
+               dgCg.SecondaryParentCachegroupID,
+               dgCg.TypeID,
+               dgCg.FallbackToClosest,
+               dgCg.ID,
+       ).Scan(
+               &dgCg.Type,
+               &dgCg.ParentName,
+               &dgCg.SecondaryParentName,
+               &dgCg.LastUpdated,
+       )
+       if err != nil {
+               if errors.Is(err, sql.ErrNoRows) {
+                       api.HandleErr(w, r, tx, http.StatusNotFound, 
fmt.Errorf("cache group with name: %s not found", dgCg.Name), nil)
+                       return
+               }
+               usrErr, sysErr, code := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, code, usrErr, sysErr)
+               return
+       }
+
+       if err = dgCg.createLocalizationMethods(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating localization methods: "+err.Error()), 
nil)
+               return
+       }
+
+       if err = dgCg.createCacheGroupFallbacks(); err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("creating cachegroup: creating cache group fallbacks: 
"+err.Error()), nil)
+               return
+       }
+
+       cg, err = dgCg.Upgrade()
+       if err != nil {
+               api.HandleErr(w, r, tx, http.StatusInternalServerError, 
fmt.Errorf("converting cachegroup: converting cache group upgrade: 
"+err.Error()), nil)
+               return
+       }
+
+       alerts := tc.CreateAlerts(tc.SuccessLevel, "cache group was updated")
+       api.WriteAlertsObj(w, r, http.StatusOK, alerts, cg)
+       return
+}
+
+// DeleteCacheGroup [Version : V5] function deletes the cache group passed.
+func DeleteCacheGroup(w http.ResponseWriter, r *http.Request) {
+       inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+       tx := inf.Tx.Tx
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+               return
+       }
+       defer inf.Close()
+
+       ID := inf.Params["id"]
+       id, err := strconv.Atoi(ID)

Review Comment:
   Unhandled error



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