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receiver.go
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receiver.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 k8sclusterreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/k8sclusterreceiver"
import (
"context"
"errors"
"fmt"
"time"
quotaclientset "github.com/openshift/client-go/quota/clientset/versioned"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/obsreport"
"k8s.io/client-go/kubernetes"
)
const (
transport = "http"
defaultInitialSyncTimeout = 10 * time.Minute
)
var _ component.MetricsReceiver = (*kubernetesReceiver)(nil)
type kubernetesReceiver struct {
resourceWatcher *resourceWatcher
config *Config
settings component.ReceiverCreateSettings
consumer consumer.Metrics
cancel context.CancelFunc
obsrecv *obsreport.Receiver
}
func (kr *kubernetesReceiver) Start(ctx context.Context, host component.Host) error {
ctx, kr.cancel = context.WithCancel(ctx)
exporters := host.GetExporters()
if err := kr.resourceWatcher.setupMetadataExporters(
exporters[config.MetricsDataType], kr.config.MetadataExporters); err != nil {
return err
}
go func() {
kr.settings.Logger.Info("Starting shared informers and wait for initial cache sync.")
for _, informer := range kr.resourceWatcher.informerFactories {
if informer == nil {
continue
}
timedContextForInitialSync := kr.resourceWatcher.startWatchingResources(ctx, informer)
// Wait till either the initial cache sync times out or until the cancel method
// corresponding to this context is called.
<-timedContextForInitialSync.Done()
// If the context times out, set initialSyncTimedOut and report a fatal error. Currently
// this timeout is 10 minutes, which appears to be long enough.
if errors.Is(timedContextForInitialSync.Err(), context.DeadlineExceeded) {
kr.resourceWatcher.initialSyncTimedOut.Store(true)
kr.settings.Logger.Error("Timed out waiting for initial cache sync.")
host.ReportFatalError(fmt.Errorf("failed to start receiver: %v", kr.config.ID()))
return
}
}
kr.settings.Logger.Info("Completed syncing shared informer caches.")
kr.resourceWatcher.initialSyncDone.Store(true)
ticker := time.NewTicker(kr.config.CollectionInterval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
kr.dispatchMetrics(ctx)
case <-ctx.Done():
return
}
}
}()
return nil
}
func (kr *kubernetesReceiver) Shutdown(context.Context) error {
kr.cancel()
return nil
}
func (kr *kubernetesReceiver) dispatchMetrics(ctx context.Context) {
now := time.Now()
mds := kr.resourceWatcher.dataCollector.CollectMetricData(now)
c := kr.obsrecv.StartMetricsOp(ctx)
numPoints := mds.DataPointCount()
err := kr.consumer.ConsumeMetrics(c, mds)
kr.obsrecv.EndMetricsOp(c, typeStr, numPoints, err)
}
// newReceiver creates the Kubernetes cluster receiver with the given configuration.
func newReceiver(
set component.ReceiverCreateSettings, config *Config, consumer consumer.Metrics,
client kubernetes.Interface, osQuotaClient quotaclientset.Interface,
) (component.MetricsReceiver, error) {
resourceWatcher, err := newResourceWatcher(set.Logger, client, osQuotaClient, config.NodeConditionTypesToReport,
config.AllocatableTypesToReport, defaultInitialSyncTimeout)
if err != nil {
return nil, fmt.Errorf("failed to setup the receiver: %w", err)
}
return &kubernetesReceiver{
resourceWatcher: resourceWatcher,
settings: set,
config: config,
consumer: consumer,
obsrecv: obsreport.NewReceiver(obsreport.ReceiverSettings{
ReceiverID: config.ID(),
Transport: transport,
ReceiverCreateSettings: set,
}),
}, nil
}