rimashah25 commented on code in PR #7079:
URL: https://github.com/apache/trafficcontrol/pull/7079#discussion_r993585681


##########
traffic_ops/traffic_ops_golang/server/servers_server_capability.go:
##########
@@ -453,77 +443,178 @@ func AssignMultipleServerCapabilities(w 
http.ResponseWriter, r *http.Request) {
        }
        defer inf.Close()
 
-       var msc tc.MultipleServerCapabilities
-       if err := json.NewDecoder(r.Body).Decode(&msc); err != nil {
-               api.HandleErr(w, r, tx, http.StatusBadRequest, err, nil)
+       var mssc tc.MultipleServersCapabilities
+       if err := json.NewDecoder(r.Body).Decode(&mssc); err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("error decoding POST request body into MultipleServersCapabilities 
struct %w", err), nil)
                return
        }
 
-       // Check existence prior to checking type
-       _, exists, err := dbhelpers.GetServerNameFromID(tx, int64(msc.ServerID))
-       if err != nil {
-               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
err)
-       }
-       if !exists {
-               userErr := fmt.Errorf("server %d does not exist", msc.ServerID)
-               api.HandleErr(w, r, tx, http.StatusNotFound, userErr, nil)
-               return
+       if len(mssc.ServerIDs) >= 1 {
+               errCode, userErr, sysErr = checkExistingServer(tx, 
mssc.ServerIDs, inf.User.UserName)
+               if userErr != nil || sysErr != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+                       return
+               }
        }
 
        // Ensure type is correct
-       correctType := true
-       if err := tx.QueryRow(scCheckServerTypeQuery(), 
msc.ServerID).Scan(&correctType); err != nil {
-               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
fmt.Errorf("checking server type: %w", err))
+       errCode, userErr, sysErr = checkServerType(tx, mssc.ServerIDs)
+       if userErr != nil || sysErr != nil {
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
                return
        }
-       if !correctType {
-               userErr := fmt.Errorf("server %d has an incorrect server type. 
Server capabilities can only be assigned to EDGE or MID servers", msc.ServerID)
-               api.HandleErr(w, r, tx, http.StatusBadRequest, userErr, nil)
-               return
+
+       // Insert rows in DB
+       sid := make([]int64, len(mssc.ServerCapabilities))
+       scs := make([]string, len(mssc.ServerIDs))
+       if len(mssc.ServerIDs) == 1 {
+               if len(mssc.ServerCapabilities) >= 1 {
+                       for i := range mssc.ServerCapabilities {
+                               sid[i] = mssc.ServerIDs[0]
+                       }
+                       scs = mssc.ServerCapabilities
+               }
+       } else if len(mssc.ServerCapabilities) == 1 {
+               if len(mssc.ServerIDs) >= 1 {
+                       for i := range mssc.ServerIDs {
+                               scs[i] = mssc.ServerCapabilities[0]
+                       }
+                       sid = mssc.ServerIDs
+               }
+       } else {
+               scs = mssc.ServerCapabilities
+               sid = mssc.ServerIDs
        }
 
-       cdnName, err := dbhelpers.GetCDNNameFromServerID(tx, 
int64(msc.ServerID))
+       msscQuery := `INSERT INTO server_server_capability
+                       select "server_capability", "server"
+                       FROM UNNEST($1::text[], $2::int[]) AS 
tmp("server_capability", "server")`
+       _, err := tx.Query(msscQuery, pq.Array(scs), pq.Array(sid))
        if err != nil {
-               api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, 
err)
+               useErr, sysErr, statusCode := api.ParseDBError(err)
+               api.HandleErr(w, r, tx, statusCode, useErr, sysErr)
                return
        }
 
-       userErr, sysErr, errCode = dbhelpers.CheckIfCurrentUserCanModifyCDN(tx, 
string(cdnName), inf.User.UserName)
+       var alerts tc.Alerts
+       if mssc.PageType == "sc" {
+               alerts = tc.CreateAlerts(tc.SuccessLevel, "Assign Server(s) to 
a capability")
+       } else {
+               alerts = tc.CreateAlerts(tc.SuccessLevel, "Assign Server 
Capability(ies) to a server")
+       }
+       api.WriteAlertsObj(w, r, http.StatusOK, alerts, mssc)
+       return
+}
+
+// DeleteMultipleServersCapabilities deletes multiple servers to a capability 
or multiple server capabilities to a server
+func DeleteMultipleServersCapabilities(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)
+               api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
                return
        }
+       defer inf.Close()
 
-       //Delete existing rows from server_server_capability for a given server
-       _, err = tx.Exec("DELETE FROM server_server_capability ssc WHERE 
ssc.server=$1", msc.ServerID)
-       if err != nil {
-               useErr, sysErr, statusCode := api.ParseDBError(err)
-               api.HandleErr(w, r, tx, statusCode, useErr, sysErr)
+       var mssc tc.MultipleServersCapabilities
+       if err := json.NewDecoder(r.Body).Decode(&mssc); err != nil {
+               api.HandleErr(w, r, tx, http.StatusBadRequest, 
fmt.Errorf("error decoding DELETE request body into MultipleServersCapabilities 
struct %w", err), nil)
                return
        }
 
-       multipleServerCapabilities := make([]string, 0, 
len(msc.ServerCapabilities))
+       if len(mssc.ServerIDs) >= 1 {
+               errCode, userErr, sysErr = checkExistingServer(tx, 
mssc.ServerIDs, inf.User.UserName)
+               if userErr != nil || sysErr != nil {
+                       api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
+                       return
+               }
+       }
 
-       mscQuery := `WITH inserted AS (
-               INSERT INTO server_server_capability
-               SELECT "server_capability", $2
-               FROM UNNEST($1::text[]) AS tmp("server_capability")
-               RETURNING server_capability
-               )
-               SELECT ARRAY_AGG(server_capability)
-               FROM (
-                       SELECT server_capability
-                       FROM inserted
-               ) AS returned(server_capability)`
+       //Delete existing rows from server_server_capability for a given server 
or for a given capability
+       const delQuery = `DELETE FROM server_server_capability ssc WHERE `
+       var dq string
+       var alerts tc.Alerts
+       if mssc.PageType == "sc" {
+               dq = delQuery + fmt.Sprintf("ssc.server_capability='%v'", 
mssc.ServerCapabilities[0])
+               if len(mssc.ServerIDs) == 1 {
+                       dq = dq + fmt.Sprintf(" AND ssc.server=%v", 
mssc.ServerIDs[0])
+               }
+       } else {
+               dq = delQuery + fmt.Sprintf("ssc.server=%v", mssc.ServerIDs[0])
+               if len(mssc.ServerCapabilities) == 1 {
+                       dq = dq + fmt.Sprintf(" AND 
ssc.server_capability='%v'", mssc.ServerCapabilities[0])

Review Comment:
   I know that.. it was part of my next update but thanks for an explanation.



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