mirror of https://github.com/k3s-io/k3s
123 lines
4.0 KiB
Go
123 lines
4.0 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package custom_metrics
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/client-go/rest"
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cmint "k8s.io/metrics/pkg/apis/custom_metrics"
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cmv1beta1 "k8s.io/metrics/pkg/apis/custom_metrics/v1beta1"
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cmv1beta2 "k8s.io/metrics/pkg/apis/custom_metrics/v1beta2"
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"k8s.io/metrics/pkg/client/custom_metrics/scheme"
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)
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var (
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// MetricVersions is the set of metric versions accepted by the converter.
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MetricVersions = []schema.GroupVersion{
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cmv1beta2.SchemeGroupVersion,
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cmv1beta1.SchemeGroupVersion,
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cmint.SchemeGroupVersion,
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}
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)
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// MetricConverter knows how to convert between external MetricValue versions.
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type MetricConverter struct {
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scheme *runtime.Scheme
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codecs serializer.CodecFactory
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internalVersioner runtime.GroupVersioner
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}
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// NewMetricConverter creates a MetricConverter which knows how to convert objects
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// between different versions of the custom metrics api.
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func NewMetricConverter() *MetricConverter {
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return &MetricConverter{
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scheme: scheme.Scheme,
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codecs: serializer.NewCodecFactory(scheme.Scheme),
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internalVersioner: runtime.NewMultiGroupVersioner(
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scheme.SchemeGroupVersion,
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schema.GroupKind{Group: cmint.GroupName, Kind: ""},
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schema.GroupKind{Group: cmv1beta1.GroupName, Kind: ""},
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schema.GroupKind{Group: cmv1beta2.GroupName, Kind: ""},
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),
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}
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}
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// Scheme returns the scheme used by this metric converter.
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func (c *MetricConverter) Scheme() *runtime.Scheme {
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return c.scheme
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}
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// Codecs returns the codecs used by this metric converter
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func (c *MetricConverter) Codecs() serializer.CodecFactory {
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return c.codecs
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}
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// ConvertListOptionsToVersion converts converts a set of MetricListOptions
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// to the provided GroupVersion.
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func (c *MetricConverter) ConvertListOptionsToVersion(opts *cmint.MetricListOptions, version schema.GroupVersion) (runtime.Object, error) {
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paramObj, err := c.UnsafeConvertToVersionVia(opts, version)
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if err != nil {
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return nil, err
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}
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return paramObj, nil
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}
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// ConvertResultToVersion converts a Result to the provided GroupVersion
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func (c *MetricConverter) ConvertResultToVersion(res rest.Result, gv schema.GroupVersion) (runtime.Object, error) {
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if err := res.Error(); err != nil {
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return nil, err
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}
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metricBytes, err := res.Raw()
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if err != nil {
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return nil, err
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}
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decoder := c.codecs.UniversalDecoder(MetricVersions...)
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rawMetricObj, err := runtime.Decode(decoder, metricBytes)
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if err != nil {
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return nil, err
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}
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metricObj, err := c.UnsafeConvertToVersionVia(rawMetricObj, gv)
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if err != nil {
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return nil, err
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}
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return metricObj, nil
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}
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// unsafeConvertToVersionVia is like Scheme.UnsafeConvertToVersion, but it does so via an internal version first.
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// We use it here to work with the v1beta2 client internally, while preserving backwards compatibility for existing custom metrics adapters
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func (c *MetricConverter) UnsafeConvertToVersionVia(obj runtime.Object, externalVersion schema.GroupVersion) (runtime.Object, error) {
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objInt, err := c.scheme.UnsafeConvertToVersion(obj, schema.GroupVersion{Group: externalVersion.Group, Version: runtime.APIVersionInternal})
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if err != nil {
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return nil, fmt.Errorf("failed to convert the given object to the internal version: %v", err)
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}
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objExt, err := c.scheme.UnsafeConvertToVersion(objInt, externalVersion)
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if err != nil {
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return nil, fmt.Errorf("failed to convert the given object back to the external version: %v", err)
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}
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return objExt, err
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}
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