add meshkit error

Signed-off-by: revolyssup <[email protected]>

helpers/component_info.json

@@ -1,5 +1,5 @@
 {
   "name": "meshery-istio",
   "type": "adapter",
-  "next_error_code": 1033
+  "next_error_code": 1034
 }

istio/error.go

@@ -123,7 +123,10 @@ var (
 
 	// ErrLoadNamespaceCode implies error while finding namespace
 	ErrLoadNamespaceCode = "1032"
+	// ErrLoadNamespaceCode implies error while finding namespace
+	ErrFetchIstioVersionsCode = "1032"
 
+	ErrFetchIstioVersions = errors.New(ErrFetchIstioVersionsCode, errors.Alert, []string{"could not get any istio versions"}, []string{"versions for istio could not be fetched"}, []string{"could not reach github.com/istio/istio/releases", "no versions could be fetched from istio release page"}, []string{"make sure adapter is reachable to github"})
 	// ErrOpInvalid represents the errors which are generated
 	// when an invalid operation is requested
 	ErrOpInvalid = errors.New(ErrOpInvalidCode, errors.Alert, []string{"Invalid operation"}, []string{"Istio adapter received an invalid operation from the meshey server"}, []string{"The operation is not supported by the adapter", "Invalid operation name"}, []string{"Check if the operation name is valid and supported by the adapter"})

istio/istio.go

@@ -62,7 +62,7 @@ func (istio *Istio) ApplyOperation(ctx context.Context, opReq adapter.OperationR
 			var err error
 			var stat, version string
 			if len(operations[opReq.OperationName].Versions) == 0 {
-				err = fmt.Errorf("no version found for " + internalconfig.IstioOperation)
+				err = ErrFetchIstioVersions
 			} else {
 				version = string(operations[opReq.OperationName].Versions[len(operations[opReq.OperationName].Versions)-1])
 				stat, err = hh.installIstio(opReq.IsDeleteOperation, false, version, opReq.Namespace, "default", kubeConfigs)