90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
/*
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Copyright 2019 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 framework
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import (
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"github.com/blang/semver"
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/version"
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)
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var DefaultGlobalRegistry = NewKubeRegistry()
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type KubeRegistry struct {
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PromRegistry
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version semver.Version
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}
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// Register registers a collectable metric, but it uses a global registry.
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func Register(c KubeCollector) error {
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return DefaultGlobalRegistry.Register(c)
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}
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// MustRegister works like Register but registers any number of
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// Collectors and panics upon the first registration that causes an
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// error.
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func MustRegister(cs ...KubeCollector) {
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DefaultGlobalRegistry.MustRegister(cs...)
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}
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func (kr *KubeRegistry) Register(c KubeCollector) error {
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if c.Create(&kr.version) {
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return kr.PromRegistry.Register(c)
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}
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return nil
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}
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func (kr *KubeRegistry) MustRegister(cs ...KubeCollector) {
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metrics := make([]prometheus.Collector, 0, len(cs))
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for _, c := range cs {
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if c.Create(&kr.version) {
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metrics = append(metrics, c)
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}
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}
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kr.PromRegistry.MustRegister(metrics...)
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}
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func (kr *KubeRegistry) Unregister(collector KubeCollector) bool {
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return kr.PromRegistry.Unregister(collector)
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}
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func (kr *KubeRegistry) Gather() ([]*dto.MetricFamily, error) {
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return kr.PromRegistry.Gather()
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}
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func NewKubeRegistry() *KubeRegistry {
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v, err := parseVersion(version.Get())
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if err != nil {
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klog.Fatalf("Can't initialize a registry without a valid version %v", err)
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}
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if v == nil {
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klog.Fatalf("No valid version loaded for metrics registry")
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}
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return newKubeRegistry(semver.MustParse(*v))
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}
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// newKubeRegistry creates a new vanilla Registry without any Collectors
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// pre-registered.
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func newKubeRegistry(version semver.Version) *KubeRegistry {
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return &KubeRegistry{
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PromRegistry: prometheus.NewRegistry(),
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version: version,
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}
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}
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