-
Notifications
You must be signed in to change notification settings - Fork 43
/
simple_applier.go
74 lines (61 loc) · 2.5 KB
/
simple_applier.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package simpletemplate contains helpers for applying options with the
// assumption that cluster objects are simple go templates. That means, that
// all the Objects present in the Component are treated as go-templates.
package simpletemplate
import (
"bytes"
"fmt"
"text/template"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
bundle "github.com/GoogleCloudPlatform/k8s-cluster-bundle/pkg/apis/bundle/v1alpha1"
"github.com/GoogleCloudPlatform/k8s-cluster-bundle/pkg/converter"
"github.com/GoogleCloudPlatform/k8s-cluster-bundle/pkg/options"
)
// applier applies options via go-templating.
type applier struct{}
// ApplyOptions treats objects in the components as go templates, applying the
// options, and then returning the completed objects.
func (m *applier) ApplyOptions(comp *bundle.Component, p options.JSONOptions) (*bundle.Component, error) {
comp = comp.DeepCopy()
newObjs, err := options.ApplyCommon(comp.ComponentReference(), comp.Spec.Objects, p, applyOptions)
comp.Spec.Objects = newObjs
return comp, err
}
// NewApplier creates a new options applier instance.
func NewApplier() options.Applier {
return &applier{}
}
func applyOptions(obj *unstructured.Unstructured, ref bundle.ComponentReference, opts options.JSONOptions) (*unstructured.Unstructured, error) {
json, err := converter.FromObject(obj).ToJSON()
if err != nil {
return nil, fmt.Errorf("error converting object named %q to json: %v", obj.GetName(), err)
}
tmpl, err := template.New(ref.ComponentName + "-tmpl").Parse(string(json))
if err != nil {
return nil, fmt.Errorf("error parsing template for component %v: %v", ref, err)
}
var buf bytes.Buffer
err = tmpl.Execute(&buf, opts)
if err != nil {
return nil, fmt.Errorf("error executing template for component %v: %v", ref, err)
}
uns, err := converter.FromJSONString(buf.String()).ToUnstructured()
if err != nil {
return nil, err
}
return uns, err
}
var _ options.ObjHandler = applyOptions