forked from kubernetes/kubernetes
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
patch.go
130 lines (115 loc) · 4.04 KB
/
patch.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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
Copyright 2017 The Kubernetes Authors.
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
http://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 handlers
import (
"fmt"
"k8s.io/apimachinery/pkg/conversion/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/json"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"github.com/evanphx/json-patch"
)
// patchObjectJSON patches the <originalObject> with <patchJS> and stores
// the result in <objToUpdate>.
// Currently it also returns the original and patched objects serialized to
// JSONs (this may not be needed once we can apply patches at the
// map[string]interface{} level).
func patchObjectJSON(
patchType types.PatchType,
codec runtime.Codec,
originalObject runtime.Object,
patchJS []byte,
objToUpdate runtime.Object,
versionedObj runtime.Object,
) (originalObjJS []byte, patchedObjJS []byte, retErr error) {
js, err := runtime.Encode(codec, originalObject)
if err != nil {
return nil, nil, err
}
originalObjJS = js
switch patchType {
case types.JSONPatchType:
patchObj, err := jsonpatch.DecodePatch(patchJS)
if err != nil {
return nil, nil, err
}
if patchedObjJS, err = patchObj.Apply(originalObjJS); err != nil {
return nil, nil, err
}
case types.MergePatchType:
if patchedObjJS, err = jsonpatch.MergePatch(originalObjJS, patchJS); err != nil {
return nil, nil, err
}
case types.StrategicMergePatchType:
if patchedObjJS, err = strategicpatch.StrategicMergePatch(originalObjJS, patchJS, versionedObj); err != nil {
return nil, nil, err
}
default:
// only here as a safety net - go-restful filters content-type
return nil, nil, fmt.Errorf("unknown Content-Type header for patch: %v", patchType)
}
if err := runtime.DecodeInto(codec, patchedObjJS, objToUpdate); err != nil {
return nil, nil, err
}
return
}
// strategicPatchObject applies a strategic merge patch of <patchJS> to
// <originalObject> and stores the result in <objToUpdate>.
// It additionally returns the map[string]interface{} representation of the
// <originalObject> and <patchJS>.
// NOTE: Both <originalObject> and <objToUpdate> are supposed to be versioned.
func strategicPatchObject(
codec runtime.Codec,
defaulter runtime.ObjectDefaulter,
originalObject runtime.Object,
patchJS []byte,
objToUpdate runtime.Object,
versionedObj runtime.Object,
) error {
originalObjMap, err := unstructured.DefaultConverter.ToUnstructured(originalObject)
if err != nil {
return err
}
patchMap := make(map[string]interface{})
if err := json.Unmarshal(patchJS, &patchMap); err != nil {
return err
}
if err := applyPatchToObject(codec, defaulter, originalObjMap, patchMap, objToUpdate, versionedObj); err != nil {
return err
}
return nil
}
// applyPatchToObject applies a strategic merge patch of <patchMap> to
// <originalMap> and stores the result in <objToUpdate>.
// NOTE: <objToUpdate> must be a versioned object.
func applyPatchToObject(
codec runtime.Codec,
defaulter runtime.ObjectDefaulter,
originalMap map[string]interface{},
patchMap map[string]interface{},
objToUpdate runtime.Object,
versionedObj runtime.Object,
) error {
patchedObjMap, err := strategicpatch.StrategicMergeMapPatch(originalMap, patchMap, versionedObj)
if err != nil {
return err
}
// Rather than serialize the patched map to JSON, then decode it to an object, we go directly from a map to an object
if err := unstructured.DefaultConverter.FromUnstructured(patchedObjMap, objToUpdate); err != nil {
return err
}
// Decoding from JSON to a versioned object would apply defaults, so we do the same here
defaulter.Default(objToUpdate)
return nil
}