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runnable.go
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/
runnable.go
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// Copyright 2020, OpenTelemetry 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: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 kubeletstatsreceiver
import (
"context"
"fmt"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/obsreport"
"go.opentelemetry.io/collector/translator/internaldata"
"go.uber.org/zap"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver/kubelet"
// todo replace with scraping lib when it's ready
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/redisreceiver/interval"
)
var _ interval.Runnable = (*runnable)(nil)
type runnable struct {
ctx context.Context
receiverName string
statsProvider *kubelet.StatsProvider
metadataProvider *kubelet.MetadataProvider
consumer consumer.MetricsConsumer
logger *zap.Logger
restClient kubelet.RestClient
extraMetadataLabels []kubelet.MetadataLabel
metricGroupsToCollect map[kubelet.MetricGroup]bool
k8sAPIClient kubernetes.Interface
cachedVolumeLabels map[string]map[string]string
}
func newRunnable(
ctx context.Context,
consumer consumer.MetricsConsumer,
restClient kubelet.RestClient,
logger *zap.Logger,
rOptions *receiverOptions,
) *runnable {
return &runnable{
ctx: ctx,
receiverName: rOptions.name,
consumer: consumer,
restClient: restClient,
logger: logger,
extraMetadataLabels: rOptions.extraMetadataLabels,
metricGroupsToCollect: rOptions.metricGroupsToCollect,
k8sAPIClient: rOptions.k8sAPIClient,
cachedVolumeLabels: make(map[string]map[string]string),
}
}
// Sets up the kubelet connection at startup time.
func (r *runnable) Setup() error {
r.statsProvider = kubelet.NewStatsProvider(r.restClient)
r.metadataProvider = kubelet.NewMetadataProvider(r.restClient)
return nil
}
func (r *runnable) Run() error {
const transport = "http"
summary, err := r.statsProvider.StatsSummary()
if err != nil {
r.logger.Error("call to /stats/summary endpoint failed", zap.Error(err))
return nil
}
var podsMetadata *v1.PodList
// fetch metadata only when extra metadata labels are needed
if len(r.extraMetadataLabels) > 0 {
podsMetadata, err = r.metadataProvider.Pods()
if err != nil {
r.logger.Error("call to /pods endpoint failed", zap.Error(err))
return nil
}
}
metadata := kubelet.NewMetadata(r.extraMetadataLabels, podsMetadata, r.detailedPVCLabelsSetter())
mds := kubelet.MetricsData(r.logger, summary, metadata, typeStr, r.metricGroupsToCollect)
metrics := internaldata.OCSliceToMetrics(mds)
var numPoints int
ctx := obsreport.ReceiverContext(r.ctx, r.receiverName, transport)
ctx = obsreport.StartMetricsReceiveOp(ctx, typeStr, transport)
err = r.consumer.ConsumeMetrics(ctx, metrics)
if err != nil {
r.logger.Error("ConsumeMetricsData failed", zap.Error(err))
} else {
_, numPoints = metrics.MetricAndDataPointCount()
}
obsreport.EndMetricsReceiveOp(ctx, typeStr, numPoints, err)
return nil
}
func (r *runnable) detailedPVCLabelsSetter() func(volCacheID, volumeClaim, namespace string, labels map[string]string) error {
return func(volCacheID, volumeClaim, namespace string, labels map[string]string) error {
if r.k8sAPIClient == nil {
return nil
}
if r.cachedVolumeLabels[volCacheID] == nil {
ctx := context.Background()
pvc, err := r.k8sAPIClient.CoreV1().PersistentVolumeClaims(namespace).Get(ctx, volumeClaim, metav1.GetOptions{})
if err != nil {
return err
}
volName := pvc.Spec.VolumeName
if volName == "" {
return fmt.Errorf("PersistentVolumeClaim %s does not have a volume name", pvc.Name)
}
pv, err := r.k8sAPIClient.CoreV1().PersistentVolumes().Get(ctx, volName, metav1.GetOptions{})
if err != nil {
return err
}
labelsToCache := make(map[string]string)
kubelet.GetPersistentVolumeLabels(pv.Spec.PersistentVolumeSource, labelsToCache)
// Cache collected labels.
r.cachedVolumeLabels[volCacheID] = labelsToCache
}
for k, v := range r.cachedVolumeLabels[volCacheID] {
labels[k] = v
}
return nil
}
}