/
yaml.go
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/
yaml.go
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/*
Copyright 2019 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 yaml
import (
"bufio"
"bytes"
"io"
"os"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/kubernetes/scheme"
clusterv1 "sigs.k8s.io/cluster-api/api/v1alpha3"
)
func ExtractClusterReferences(out *ParseOutput, c *clusterv1.Cluster) (res []*unstructured.Unstructured) {
if c.Spec.InfrastructureRef == nil {
return nil
}
if obj := out.FindUnstructuredReference(c.Spec.InfrastructureRef); obj != nil {
res = append(res, obj)
}
return
}
func ExtractMachineReferences(out *ParseOutput, m *clusterv1.Machine) (res []*unstructured.Unstructured) {
if obj := out.FindUnstructuredReference(&m.Spec.InfrastructureRef); obj != nil {
res = append(res, obj)
}
if m.Spec.Bootstrap.ConfigRef != nil {
if obj := out.FindUnstructuredReference(m.Spec.Bootstrap.ConfigRef); obj != nil {
res = append(res, obj)
}
}
return
}
type ParseInput struct {
File string
}
type ParseOutput struct {
Clusters []*clusterv1.Cluster
Machines []*clusterv1.Machine
MachineSets []*clusterv1.MachineSet
MachineDeployments []*clusterv1.MachineDeployment
UnstructuredObjects []*unstructured.Unstructured
}
// Add adds the other ParseOutput slices to this instance.
func (p *ParseOutput) Add(o *ParseOutput) *ParseOutput {
p.Clusters = append(p.Clusters, o.Clusters...)
p.Machines = append(p.Machines, o.Machines...)
p.MachineSets = append(p.MachineSets, o.MachineSets...)
p.MachineDeployments = append(p.MachineDeployments, o.MachineDeployments...)
p.UnstructuredObjects = append(p.UnstructuredObjects, o.UnstructuredObjects...)
return p
}
// FindUnstructuredReference takes in an ObjectReference and tries to find an Unstructured object.
func (p *ParseOutput) FindUnstructuredReference(ref *corev1.ObjectReference) *unstructured.Unstructured {
for _, obj := range p.UnstructuredObjects {
if obj.GroupVersionKind() == ref.GroupVersionKind() &&
ref.Namespace == obj.GetNamespace() &&
ref.Name == obj.GetName() {
return obj
}
}
return nil
}
// Parse extracts runtime objects from a file.
func Parse(input ParseInput) (*ParseOutput, error) {
output := &ParseOutput{}
// Open the input file.
reader, err := os.Open(input.File)
if err != nil {
return nil, err
}
// Create a new decoder.
decoder := NewYAMLDecoder(reader)
defer decoder.Close()
for {
u := &unstructured.Unstructured{}
_, gvk, err := decoder.Decode(nil, u)
if err == io.EOF {
break
}
if runtime.IsNotRegisteredError(err) {
continue
}
if err != nil {
return nil, err
}
switch gvk.Kind {
case "Cluster":
obj := &clusterv1.Cluster{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(u.Object, obj); err != nil {
return nil, errors.Wrapf(err, "cannot convert object to %s", gvk.Kind)
}
output.Clusters = append(output.Clusters, obj)
case "Machine":
obj := &clusterv1.Machine{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(u.Object, obj); err != nil {
return nil, errors.Wrapf(err, "cannot convert object to %s", gvk.Kind)
}
output.Machines = append(output.Machines, obj)
case "MachineSet":
obj := &clusterv1.MachineSet{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(u.Object, obj); err != nil {
return nil, errors.Wrapf(err, "cannot convert object to %s", gvk.Kind)
}
output.MachineSets = append(output.MachineSets, obj)
case "MachineDeployment":
obj := &clusterv1.MachineDeployment{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(u.Object, obj); err != nil {
return nil, errors.Wrapf(err, "cannot convert object to %s", gvk.Kind)
}
output.MachineDeployments = append(output.MachineDeployments, obj)
default:
output.UnstructuredObjects = append(output.UnstructuredObjects, u)
}
}
return output, nil
}
type yamlDecoder struct {
reader *yaml.YAMLReader
decoder runtime.Decoder
close func() error
}
func (d *yamlDecoder) Decode(defaults *schema.GroupVersionKind, into runtime.Object) (runtime.Object, *schema.GroupVersionKind, error) {
for {
doc, err := d.reader.Read()
if err != nil {
return nil, nil, err
}
// Skip over empty documents, i.e. a leading `---`
if len(bytes.TrimSpace(doc)) == 0 {
continue
}
return d.decoder.Decode(doc, defaults, into)
}
}
func (d *yamlDecoder) Close() error {
return d.close()
}
func NewYAMLDecoder(r io.ReadCloser) streaming.Decoder {
return &yamlDecoder{
reader: yaml.NewYAMLReader(bufio.NewReader(r)),
decoder: scheme.Codecs.UniversalDeserializer(),
close: r.Close,
}
}