forked from kubernetes-retired/heapster
/
external.go
216 lines (197 loc) · 6.17 KB
/
external.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 sinks
import (
"bytes"
"fmt"
"strings"
"sync"
"time"
"github.com/golang/glog"
sink_api "k8s.io/heapster/sinks/api"
"k8s.io/heapster/sinks/cache"
hUtil "k8s.io/heapster/util"
kube_api "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/util"
)
type lastSync struct {
podSync time.Time
nodeSync time.Time
eventsSync time.Time
}
type externalSinkManager struct {
cache cache.Cache
lastSync lastSync
syncFrequency time.Duration
decoder sink_api.Decoder
externalSinks []sink_api.ExternalSink
sync.RWMutex // Protects externalSinks
}
func supportedMetricsDescriptors() []sink_api.MetricDescriptor {
// Get supported metrics.
supportedMetrics := sink_api.SupportedStatMetrics()
for i := range supportedMetrics {
supportedMetrics[i].Labels = sink_api.SupportedLabels()
}
// Create the metrics.
descriptors := make([]sink_api.MetricDescriptor, 0, len(supportedMetrics))
for _, supported := range supportedMetrics {
descriptors = append(descriptors, supported.MetricDescriptor)
}
return descriptors
}
// NewExternalSinkManager returns an external sink manager that will manage pushing data to all
// the sinks in 'externalSinks', which is a map of sink name to ExternalSink object.
func NewExternalSinkManager(externalSinks []sink_api.ExternalSink, cache cache.Cache, syncFrequency time.Duration) (ExternalSinkManager, error) {
m := &externalSinkManager{
decoder: sink_api.NewDecoder(),
cache: cache,
lastSync: lastSync{},
syncFrequency: syncFrequency,
}
if externalSinks != nil {
if err := m.SetSinks(externalSinks); err != nil {
return nil, err
}
}
return m, nil
}
func (esm *externalSinkManager) Sync() chan<- struct{} {
stopChan := make(chan struct{})
go util.Until(esm.sync, esm.syncFrequency, stopChan)
return stopChan
}
func (esm *externalSinkManager) sync() {
if err := esm.store(); err != nil {
glog.Errorf("failed to sync data to sinks - %v", err)
}
}
var zeroTime = time.Time{}
// TODO(vmarmol): Paralellize this.
func (esm *externalSinkManager) store() error {
pods := esm.cache.GetPods(esm.lastSync.podSync, zeroTime)
for _, pod := range pods {
esm.lastSync.podSync = hUtil.GetLatest(esm.lastSync.podSync, pod.LastUpdate)
}
containers := esm.cache.GetNodes(esm.lastSync.nodeSync, zeroTime)
containers = append(containers, esm.cache.GetFreeContainers(esm.lastSync.nodeSync, zeroTime)...)
for _, c := range containers {
esm.lastSync.nodeSync = hUtil.GetLatest(esm.lastSync.nodeSync, c.LastUpdate)
}
// TODO: Store data in cache.
timeseries, err := esm.decoder.TimeseriesFromPods(pods)
if err != nil {
return err
}
containerTimeseries, err := esm.decoder.TimeseriesFromContainers(containers)
if err != nil {
return err
}
timeseries = append(timeseries, containerTimeseries...)
if len(timeseries) == 0 {
glog.V(3).Infof("no timeseries data between %v and %v", esm.lastSync.nodeSync, zeroTime)
// Continue here to push events data.
}
events := esm.cache.GetEvents(esm.lastSync.eventsSync, zeroTime)
var kEvents []kube_api.Event
for _, event := range events {
kEvents = append(kEvents, event.Raw)
esm.lastSync.eventsSync = hUtil.GetLatest(esm.lastSync.eventsSync, event.LastUpdate)
}
if len(timeseries) == 0 && len(events) == 0 {
glog.V(5).Infof("Skipping sync loop")
return nil
}
// Format metrics and push them.
esm.RLock()
defer esm.RUnlock()
errorsLen := 2 * len(esm.externalSinks)
errorsChan := make(chan error, errorsLen)
for idx := range esm.externalSinks {
sink := esm.externalSinks[idx]
go func(sink sink_api.ExternalSink) {
glog.V(2).Infof("Storing Timeseries to %q", sink.Name())
errorsChan <- sink.StoreTimeseries(timeseries)
}(sink)
go func(sink sink_api.ExternalSink) {
glog.V(2).Infof("Storing Events to %q", sink.Name())
errorsChan <- sink.StoreEvents(kEvents)
}(sink)
}
var errors []string
for i := 0; i < errorsLen; i++ {
if err := <-errorsChan; err != nil {
errors = append(errors, fmt.Sprintf("%v ", err))
}
}
if len(errors) > 0 {
return fmt.Errorf("encountered the following errors: %s", strings.Join(errors, ";\n"))
}
return nil
}
func (esm *externalSinkManager) DebugInfo() string {
b := &bytes.Buffer{}
fmt.Fprintln(b, "External Sinks")
// Add metrics being exported.
fmt.Fprintln(b, "\tExported metrics:")
for _, supported := range sink_api.SupportedStatMetrics() {
fmt.Fprintf(b, "\t\t%s: %s\n", supported.Name, supported.Description)
}
// Add labels being used.
fmt.Fprintln(b, "\tExported labels:")
for _, label := range sink_api.SupportedLabels() {
fmt.Fprintf(b, "\t\t%s: %s\n", label.Key, label.Description)
}
fmt.Fprintln(b, "\tExternal Sinks:")
esm.RLock()
defer esm.RUnlock()
for _, externalSink := range esm.externalSinks {
fmt.Fprintf(b, "\t\t%s\n", externalSink.DebugInfo())
}
return b.String()
}
// inSlice returns whether an external sink is part of a set (list) of sinks
func inSlice(sink sink_api.ExternalSink, sinks []sink_api.ExternalSink) bool {
for _, s := range sinks {
if sink == s {
return true
}
}
return false
}
func (esm *externalSinkManager) SetSinks(newSinks []sink_api.ExternalSink) error {
esm.Lock()
defer esm.Unlock()
oldSinks := esm.externalSinks
descriptors := supportedMetricsDescriptors()
for _, sink := range oldSinks {
if inSlice(sink, newSinks) {
continue
}
if err := sink.Unregister(descriptors); err != nil {
return err
}
}
for _, sink := range newSinks {
if inSlice(sink, oldSinks) {
continue
}
if err := sink.Register(descriptors); err != nil {
return err
}
}
esm.externalSinks = newSinks
glog.V(2).Infof("Updated sinks: %+v", esm.externalSinks)
return nil
}