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health.go
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health.go
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// Copyright © 2020 Circonus, Inc. <support@circonus.com>
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// Package health contains collection/calculation of derived metrics used
// for dashboard and alerting
package health
import (
"context"
"crypto/tls"
"errors"
"sync"
"time"
"github.com/circonus-labs/circonus-kubernetes-agent/internal/circonus"
"github.com/circonus-labs/circonus-kubernetes-agent/internal/config"
"github.com/circonus-labs/circonus-kubernetes-agent/internal/release"
"github.com/rs/zerolog"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
type Health struct {
config *config.Cluster
check *circonus.Check
log zerolog.Logger
}
func New(cfg *config.Cluster, parentLog zerolog.Logger, check *circonus.Check) (*Health, error) {
if cfg == nil {
return nil, errors.New("invalid cluster config (nil)")
}
if check == nil {
return nil, errors.New("invalid check (nil)")
}
h := &Health{
config: cfg,
check: check,
log: parentLog.With().Str("collector", "health").Logger(),
}
return h, nil
}
func (h *Health) ID() string {
return "health"
}
func (h *Health) Collect(ctx context.Context, tlsConfig *tls.Config, ts *time.Time) {
var cfg *rest.Config
if c, err := rest.InClusterConfig(); err != nil {
if !errors.Is(err, rest.ErrNotInCluster) {
h.log.Error().Err(err).Msg("unable to initialize health collector")
return
}
// not in cluster, use supplied customer config for cluster
cfg = &rest.Config{}
if h.config.BearerToken != "" {
cfg.BearerToken = h.config.BearerToken
}
if h.config.URL != "" {
cfg.Host = h.config.URL
}
if h.config.CAFile != "" {
cfg.TLSClientConfig = rest.TLSClientConfig{CAFile: h.config.CAFile}
}
} else {
cfg = c // use in-cluster config
}
clientset, err := kubernetes.NewForConfig(cfg)
if err != nil {
h.log.Error().Err(err).Msg("initializing client set")
return
}
baseMeasurementTags := []string{}
baseStreamTags := []string{"source:" + release.NAME}
var wg sync.WaitGroup
wg.Add(1)
go func() {
h.deployments(ctx, clientset, ts, baseStreamTags, baseMeasurementTags)
wg.Done()
}()
wg.Add(1)
go func() {
h.daemonsets(ctx, clientset, ts, baseStreamTags, baseMeasurementTags)
wg.Done()
}()
wg.Add(1)
go func() {
h.statefulsets(ctx, clientset, ts, baseStreamTags, baseMeasurementTags)
wg.Done()
}()
wg.Wait()
}
func (h *Health) deployments(ctx context.Context, cs *kubernetes.Clientset, ts *time.Time, parentStreamTags, parentMeasurementTags []string) {
metrics := make(map[string]circonus.MetricSample)
list, err := cs.AppsV1().Deployments("").List(ctx, v1.ListOptions{})
if err != nil {
h.log.Error().Err(err).Msg("deployments list")
}
if len(list.Items) == 0 {
return // there aren't any deployments in the cluster
}
for _, item := range list.Items {
streamTags := h.check.NewTagList(parentStreamTags, []string{
"name:" + item.GetName(),
"namespace:" + item.GetNamespace(),
})
_ = h.check.QueueMetricSample(
metrics,
"deployment_generation_delta",
circonus.MetricTypeInt64,
streamTags, parentMeasurementTags,
item.GetGeneration()-item.Status.ObservedGeneration,
ts)
}
if len(metrics) == 0 {
// h.log.Warn().Msg("no meta deployment health telemetry to submit")
return
}
if err := h.check.FlushCollectorMetrics(ctx, metrics, h.log.With().Str("type", "health-deployment").Logger(), true); err != nil {
h.log.Warn().Err(err).Msg("submitting metrics")
}
}
func (h *Health) daemonsets(ctx context.Context, cs *kubernetes.Clientset, ts *time.Time, parentStreamTags, parentMeasurementTags []string) {
metrics := make(map[string]circonus.MetricSample)
list, err := cs.AppsV1().DaemonSets("").List(ctx, v1.ListOptions{})
if err != nil {
h.log.Error().Err(err).Msg("daemonsets list")
}
if len(list.Items) == 0 {
return // there aren't any daemonsets in the cluster
}
for _, item := range list.Items {
streamTags := h.check.NewTagList(parentStreamTags, []string{
"name:" + item.GetName(),
"namespace:" + item.GetNamespace(),
})
_ = h.check.QueueMetricSample(
metrics,
"daemonset_scheduled_delta",
circonus.MetricTypeInt64,
streamTags, parentMeasurementTags,
item.Status.DesiredNumberScheduled-item.Status.CurrentNumberScheduled,
ts)
}
if len(metrics) == 0 {
// h.log.Warn().Msg("no meta daemonset health telemetry to submit")
return
}
if err := h.check.FlushCollectorMetrics(ctx, metrics, h.log.With().Str("type", "health-daemonset").Logger(), true); err != nil {
h.log.Warn().Err(err).Msg("submitting metrics")
}
}
func (h *Health) statefulsets(ctx context.Context, cs *kubernetes.Clientset, ts *time.Time, parentStreamTags, parentMeasurementTags []string) {
metrics := make(map[string]circonus.MetricSample)
list, err := cs.AppsV1().StatefulSets("").List(ctx, v1.ListOptions{})
if err != nil {
h.log.Error().Err(err).Msg("statefulsets list")
}
if len(list.Items) == 0 {
return // there aren't any statefulsets in the cluster
}
for _, item := range list.Items {
streamTags := h.check.NewTagList(parentStreamTags, []string{
"name:" + item.GetName(),
"namespace:" + item.GetNamespace(),
})
_ = h.check.QueueMetricSample(
metrics,
"statefulset_replica_delta",
circonus.MetricTypeInt64,
streamTags, parentMeasurementTags,
*item.Spec.Replicas-item.Status.ReadyReplicas,
ts)
}
if len(metrics) == 0 {
// h.log.Warn().Msg("no meta statefulset health telemetry to submit")
return
}
if err := h.check.FlushCollectorMetrics(ctx, metrics, h.log.With().Str("type", "health-statefulset").Logger(), true); err != nil {
h.log.Warn().Err(err).Msg("submitting metrics")
}
}