Merge pull request #65 from flanksource/ignore-fields

feat: add ability to ignore specific fields from walking while templa…

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/flanksource/commons v1.5.6
 	github.com/hairyhenderson/gomplate/v3 v3.6.0
 	github.com/mitchellh/mapstructure v1.3.3
+	github.com/mitchellh/reflectwalk v1.0.0
 	github.com/pkg/errors v0.9.1
 	github.com/sergi/go-diff v1.0.0
 	github.com/sirupsen/logrus v1.7.0

go.sum

@@ -469,6 +469,7 @@ github.com/mitchellh/mapstructure v0.0.0-20160808181253-ca63d7c062ee/go.mod h1:F
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.3.3 h1:SzB1nHZ2Xi+17FP0zVQBHIZqvwRN9408fJO8h+eeNA8=
 github.com/mitchellh/mapstructure v1.3.3/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/mitchellh/reflectwalk v1.0.0 h1:9D+8oIskB4VJBN5SFlmc27fSlIBZaov1Wpk/IfikLNY=
 github.com/mitchellh/reflectwalk v1.0.0/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
 github.com/moby/term v0.0.0-20200312100748-672ec06f55cd/go.mod h1:DdlQx2hp0Ss5/fLikoLlEeIYiATotOjgB//nb973jeo=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=

ktemplate/structtemplater.go

@@ -1,6 +1,7 @@
 package ktemplate
 
 import (
+	"github.com/mitchellh/reflectwalk"
 	"k8s.io/client-go/kubernetes"
 	"reflect"
 	"strings"
@@ -10,6 +11,8 @@ type StructTemplater struct {
 	Values    map[string]string
 	Clientset *kubernetes.Clientset
 	functions *Functions
+	// IgnoreFields from walking where key is field name and value is field type
+	IgnoreFields map[string]string
 }
 
 // this func is required to fulfil the reflectwalk.StructWalker interface
@@ -18,6 +21,11 @@ func (w StructTemplater) Struct(reflect.Value) error {
 }
 
 func (w StructTemplater) StructField(f reflect.StructField, v reflect.Value) error {
+	for key, value := range w.IgnoreFields {
+		if key == f.Name && value == f.Type.String() {
+			return reflectwalk.SkipEntry
+		}
+	}
 	if v.CanSet() && v.Kind() == reflect.String {
 		v.SetString(w.Template(v.String()))
 	}