/
operator.go
1508 lines (1299 loc) · 44.9 KB
/
operator.go
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// Copyright 2016 The prometheus-operator 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://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 prometheus
import (
"bytes"
"compress/gzip"
"fmt"
"reflect"
"strings"
"time"
monitoringv1 "github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"
monitoringclient "github.com/coreos/prometheus-operator/pkg/client/versioned"
"github.com/coreos/prometheus-operator/pkg/k8sutil"
"github.com/coreos/prometheus-operator/pkg/listwatch"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/mitchellh/hashstructure"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
appsv1 "k8s.io/api/apps/v1beta2"
"k8s.io/api/core/v1"
extensionsobj "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apiextensionsclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/kubernetes"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
const (
resyncPeriod = 5 * time.Minute
)
// Operator manages life cycle of Prometheus deployments and
// monitoring configurations.
type Operator struct {
kclient kubernetes.Interface
mclient monitoringclient.Interface
crdclient apiextensionsclient.Interface
logger log.Logger
promInf cache.SharedIndexInformer
smonInf cache.SharedIndexInformer
ruleInf cache.SharedIndexInformer
cmapInf cache.SharedIndexInformer
secrInf cache.SharedIndexInformer
ssetInf cache.SharedIndexInformer
nsInf cache.SharedIndexInformer
queue workqueue.RateLimitingInterface
reconcileErrorsCounter *prometheus.CounterVec
// triggerByCounter is a set of counters keeping track of the amount
// of times Prometheus Operator was triggered to reconcile its created
// objects. It is split in the dimensions of Kubernetes objects and
// corresponding actions (add, delete, update).
triggerByCounter *prometheus.CounterVec
nodeAddressLookupErrors prometheus.Counter
host string
kubeletObjectName string
kubeletObjectNamespace string
kubeletSyncEnabled bool
config Config
configGenerator *configGenerator
}
type Labels struct {
LabelsString string
LabelsMap map[string]string
}
// Implement the flag.Value interface
func (labels *Labels) String() string {
return labels.LabelsString
}
// Merge labels create a new map with labels merged.
func (labels *Labels) Merge(otherLabels map[string]string) map[string]string {
mergedLabels := map[string]string{}
for key, value := range otherLabels {
mergedLabels[key] = value
}
for key, value := range labels.LabelsMap {
mergedLabels[key] = value
}
return mergedLabels
}
// Set implements the flag.Set interface.
func (labels *Labels) Set(value string) error {
m := map[string]string{}
if value != "" {
splited := strings.Split(value, ",")
for _, pair := range splited {
sp := strings.Split(pair, "=")
m[sp[0]] = sp[1]
}
}
(*labels).LabelsMap = m
(*labels).LabelsString = value
return nil
}
// Config defines configuration parameters for the Operator.
type Config struct {
Host string
KubeletObject string
TLSInsecure bool
TLSConfig rest.TLSClientConfig
ConfigReloaderImage string
ConfigReloaderCPU string
ConfigReloaderMemory string
PrometheusConfigReloader string
AlertmanagerDefaultBaseImage string
PrometheusDefaultBaseImage string
ThanosDefaultBaseImage string
Namespaces []string
Labels Labels
CrdGroup string
CrdKinds monitoringv1.CrdKinds
EnableValidation bool
LocalHost string
LogLevel string
LogFormat string
ManageCRDs bool
}
type BasicAuthCredentials struct {
username string
password string
}
// New creates a new controller.
func New(conf Config, logger log.Logger) (*Operator, error) {
cfg, err := k8sutil.NewClusterConfig(conf.Host, conf.TLSInsecure, &conf.TLSConfig)
if err != nil {
return nil, errors.Wrap(err, "instantiating cluster config failed")
}
client, err := kubernetes.NewForConfig(cfg)
if err != nil {
return nil, errors.Wrap(err, "instantiating kubernetes client failed")
}
crdclient, err := apiextensionsclient.NewForConfig(cfg)
if err != nil {
return nil, errors.Wrap(err, "instantiating apiextensions client failed")
}
mclient, err := monitoringclient.NewForConfig(cfg)
if err != nil {
return nil, errors.Wrap(err, "instantiating monitoring client failed")
}
kubeletObjectName := ""
kubeletObjectNamespace := ""
kubeletSyncEnabled := false
if conf.KubeletObject != "" {
parts := strings.Split(conf.KubeletObject, "/")
if len(parts) != 2 {
return nil, fmt.Errorf("malformatted kubelet object string, must be in format \"namespace/name\"")
}
kubeletObjectNamespace = parts[0]
kubeletObjectName = parts[1]
kubeletSyncEnabled = true
}
c := &Operator{
kclient: client,
mclient: mclient,
crdclient: crdclient,
logger: logger,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "prometheus"),
host: cfg.Host,
kubeletObjectName: kubeletObjectName,
kubeletObjectNamespace: kubeletObjectNamespace,
kubeletSyncEnabled: kubeletSyncEnabled,
config: conf,
configGenerator: NewConfigGenerator(logger),
}
c.promInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return mclient.MonitoringV1().Prometheuses(namespace).List(options)
},
WatchFunc: mclient.MonitoringV1().Prometheuses(namespace).Watch,
}
}),
&monitoringv1.Prometheus{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
c.smonInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return mclient.MonitoringV1().ServiceMonitors(namespace).List(options)
},
WatchFunc: mclient.MonitoringV1().ServiceMonitors(namespace).Watch,
}
}),
&monitoringv1.ServiceMonitor{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
c.ruleInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return mclient.MonitoringV1().PrometheusRules(namespace).List(options)
},
WatchFunc: mclient.MonitoringV1().PrometheusRules(namespace).Watch,
}
}),
&monitoringv1.PrometheusRule{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
c.cmapInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return cache.NewListWatchFromClient(c.kclient.Core().RESTClient(), "configmaps", namespace, fields.Everything())
}),
&v1.ConfigMap{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
c.secrInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return cache.NewListWatchFromClient(c.kclient.Core().RESTClient(), "secrets", namespace, fields.Everything())
}),
&v1.Secret{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
c.ssetInf = cache.NewSharedIndexInformer(
listwatch.MultiNamespaceListerWatcher(c.config.Namespaces, func(namespace string) cache.ListerWatcher {
return cache.NewListWatchFromClient(c.kclient.AppsV1beta2().RESTClient(), "statefulsets", namespace, fields.Everything())
}),
&appsv1.StatefulSet{}, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
// nsResyncPeriod is used to control how often the namespace informer
// should resync. If the unprivileged ListerWatcher is used, then the
// informer must resync more often because it cannot watch for
// namespace changes.
nsResyncPeriod := 15 * time.Second
// If the only namespace is v1.NamespaceAll, then the client must be
// privileged and a regular cache.ListWatch will be used. In this case
// watching works and we do not need to resync so frequently.
if listwatch.IsAllNamespaces(c.config.Namespaces) {
nsResyncPeriod = resyncPeriod
}
c.nsInf = cache.NewSharedIndexInformer(
listwatch.NewUnprivilegedNamespaceListWatchFromClient(c.kclient.Core().RESTClient(), c.config.Namespaces, fields.Everything()),
&v1.Namespace{}, nsResyncPeriod, cache.Indexers{},
)
return c, nil
}
// RegisterMetrics registers Prometheus metrics on the given Prometheus
// registerer.
func (c *Operator) RegisterMetrics(r prometheus.Registerer, reconcileErrorsCounter *prometheus.CounterVec, triggerByCounter *prometheus.CounterVec) {
c.reconcileErrorsCounter = reconcileErrorsCounter
c.triggerByCounter = triggerByCounter
c.reconcileErrorsCounter.With(prometheus.Labels{}).Add(0)
c.nodeAddressLookupErrors = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_operator_node_address_lookup_errors_total",
Help: "Number of times a node IP address could not be determined",
})
r.MustRegister(
c.nodeAddressLookupErrors,
NewPrometheusCollector(c.promInf.GetStore()),
)
}
// waitForCacheSync waits for the informers' caches to be synced.
func (c *Operator) waitForCacheSync(stopc <-chan struct{}) error {
ok := true
informers := []struct {
name string
informer cache.SharedIndexInformer
}{
{"Prometheus", c.promInf},
{"ServiceMonitor", c.smonInf},
{"PrometheusRule", c.ruleInf},
{"ConfigMap", c.cmapInf},
{"Secret", c.secrInf},
{"StatefulSet", c.ssetInf},
{"Namespace", c.nsInf},
}
for _, inf := range informers {
if !cache.WaitForCacheSync(stopc, inf.informer.HasSynced) {
level.Error(c.logger).Log("msg", fmt.Sprintf("failed to sync %s cache", inf.name))
ok = false
} else {
level.Debug(c.logger).Log("msg", fmt.Sprintf("successfully synced %s cache", inf.name))
}
}
if !ok {
return errors.New("failed to sync caches")
}
level.Info(c.logger).Log("msg", "successfully synced all caches")
return nil
}
// addHandlers adds the eventhandlers to the informers.
func (c *Operator) addHandlers() {
c.promInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handlePrometheusAdd,
DeleteFunc: c.handlePrometheusDelete,
UpdateFunc: c.handlePrometheusUpdate,
})
c.smonInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleSmonAdd,
DeleteFunc: c.handleSmonDelete,
UpdateFunc: c.handleSmonUpdate,
})
c.ruleInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleRuleAdd,
DeleteFunc: c.handleRuleDelete,
UpdateFunc: c.handleRuleUpdate,
})
c.cmapInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleConfigMapAdd,
DeleteFunc: c.handleConfigMapDelete,
UpdateFunc: c.handleConfigMapUpdate,
})
c.secrInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleSecretAdd,
DeleteFunc: c.handleSecretDelete,
UpdateFunc: c.handleSecretUpdate,
})
c.ssetInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleStatefulSetAdd,
DeleteFunc: c.handleStatefulSetDelete,
UpdateFunc: c.handleStatefulSetUpdate,
})
}
// Run the controller.
func (c *Operator) Run(stopc <-chan struct{}) error {
defer c.queue.ShutDown()
errChan := make(chan error)
go func() {
v, err := c.kclient.Discovery().ServerVersion()
if err != nil {
errChan <- errors.Wrap(err, "communicating with server failed")
return
}
level.Info(c.logger).Log("msg", "connection established", "cluster-version", v)
if c.config.ManageCRDs {
if err := c.createCRDs(); err != nil {
errChan <- errors.Wrap(err, "creating CRDs failed")
return
}
}
errChan <- nil
}()
select {
case err := <-errChan:
if err != nil {
return err
}
level.Info(c.logger).Log("msg", "CRD API endpoints ready")
case <-stopc:
return nil
}
go c.worker()
go c.promInf.Run(stopc)
go c.smonInf.Run(stopc)
go c.ruleInf.Run(stopc)
go c.cmapInf.Run(stopc)
go c.secrInf.Run(stopc)
go c.ssetInf.Run(stopc)
go c.nsInf.Run(stopc)
if err := c.waitForCacheSync(stopc); err != nil {
return err
}
c.addHandlers()
if c.kubeletSyncEnabled {
go c.reconcileNodeEndpoints(stopc)
}
<-stopc
return nil
}
func (c *Operator) keyFunc(obj interface{}) (string, bool) {
k, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
level.Error(c.logger).Log("msg", "creating key failed", "err", err)
return k, false
}
return k, true
}
func (c *Operator) handlePrometheusAdd(obj interface{}) {
key, ok := c.keyFunc(obj)
if !ok {
return
}
level.Debug(c.logger).Log("msg", "Prometheus added", "key", key)
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusesKind, "add").Inc()
c.enqueue(key)
}
func (c *Operator) handlePrometheusDelete(obj interface{}) {
key, ok := c.keyFunc(obj)
if !ok {
return
}
level.Debug(c.logger).Log("msg", "Prometheus deleted", "key", key)
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusesKind, "delete").Inc()
c.enqueue(key)
}
func (c *Operator) handlePrometheusUpdate(old, cur interface{}) {
if old.(*monitoringv1.Prometheus).ResourceVersion == cur.(*monitoringv1.Prometheus).ResourceVersion {
return
}
key, ok := c.keyFunc(cur)
if !ok {
return
}
level.Debug(c.logger).Log("msg", "Prometheus updated", "key", key)
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusesKind, "update").Inc()
c.enqueue(key)
}
func (c *Operator) reconcileNodeEndpoints(stopc <-chan struct{}) {
ticker := time.NewTicker(3 * time.Minute)
defer ticker.Stop()
for {
select {
case <-stopc:
return
case <-ticker.C:
err := c.syncNodeEndpoints()
if err != nil {
level.Error(c.logger).Log("msg", "syncing nodes into Endpoints object failed", "err", err)
}
}
}
}
// nodeAddresses returns the provided node's address, based on the priority:
// 1. NodeInternalIP
// 2. NodeExternalIP
//
// Copied from github.com/prometheus/prometheus/discovery/kubernetes/node.go
func nodeAddress(node v1.Node) (string, map[v1.NodeAddressType][]string, error) {
m := map[v1.NodeAddressType][]string{}
for _, a := range node.Status.Addresses {
m[a.Type] = append(m[a.Type], a.Address)
}
if addresses, ok := m[v1.NodeInternalIP]; ok {
return addresses[0], m, nil
}
if addresses, ok := m[v1.NodeExternalIP]; ok {
return addresses[0], m, nil
}
return "", m, fmt.Errorf("host address unknown")
}
func getNodeAddresses(nodes *v1.NodeList) ([]v1.EndpointAddress, []error) {
addresses := make([]v1.EndpointAddress, 0)
errs := make([]error, 0)
for _, n := range nodes.Items {
address, _, err := nodeAddress(n)
if err != nil {
errs = append(errs, errors.Wrapf(err, "failed to determine hostname for node (%s)", n.Name))
continue
}
addresses = append(addresses, v1.EndpointAddress{
IP: address,
TargetRef: &v1.ObjectReference{
Kind: "Node",
Name: n.Name,
UID: n.UID,
APIVersion: n.APIVersion,
},
})
}
return addresses, errs
}
func (c *Operator) syncNodeEndpoints() error {
eps := &v1.Endpoints{
ObjectMeta: metav1.ObjectMeta{
Name: c.kubeletObjectName,
Labels: c.config.Labels.Merge(map[string]string{
"k8s-app": "kubelet",
}),
},
Subsets: []v1.EndpointSubset{
{
Ports: []v1.EndpointPort{
{
Name: "https-metrics",
Port: 10250,
},
{
Name: "http-metrics",
Port: 10255,
},
{
Name: "cadvisor",
Port: 4194,
},
},
},
},
}
nodes, err := c.kclient.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
return errors.Wrap(err, "listing nodes failed")
}
addresses, errs := getNodeAddresses(nodes)
if len(errs) > 0 {
for _, err := range errs {
level.Warn(c.logger).Log("err", err)
}
c.nodeAddressLookupErrors.Add(float64(len(errs)))
}
eps.Subsets[0].Addresses = addresses
svc := &v1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: c.kubeletObjectName,
Labels: c.config.Labels.Merge(map[string]string{
"k8s-app": "kubelet",
}),
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "None",
Ports: []v1.ServicePort{
{
Name: "https-metrics",
Port: 10250,
},
},
},
}
err = k8sutil.CreateOrUpdateService(c.kclient.CoreV1().Services(c.kubeletObjectNamespace), svc)
if err != nil {
return errors.Wrap(err, "synchronizing kubelet service object failed")
}
err = k8sutil.CreateOrUpdateEndpoints(c.kclient.CoreV1().Endpoints(c.kubeletObjectNamespace), eps)
if err != nil {
return errors.Wrap(err, "synchronizing kubelet endpoints object failed")
}
return nil
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleSmonAdd(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "ServiceMonitor added")
c.triggerByCounter.WithLabelValues(monitoringv1.ServiceMonitorsKind, "add").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleSmonUpdate(old, cur interface{}) {
if old.(*monitoringv1.ServiceMonitor).ResourceVersion == cur.(*monitoringv1.ServiceMonitor).ResourceVersion {
return
}
o, ok := c.getObject(cur)
if ok {
level.Debug(c.logger).Log("msg", "ServiceMonitor updated")
c.triggerByCounter.WithLabelValues(monitoringv1.ServiceMonitorsKind, "update").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleSmonDelete(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "ServiceMonitor delete")
c.triggerByCounter.WithLabelValues(monitoringv1.ServiceMonitorsKind, "delete").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleRuleAdd(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "PrometheusRule added")
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusRuleKind, "add").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleRuleUpdate(old, cur interface{}) {
if old.(*monitoringv1.PrometheusRule).ResourceVersion == cur.(*monitoringv1.PrometheusRule).ResourceVersion {
return
}
o, ok := c.getObject(cur)
if ok {
level.Debug(c.logger).Log("msg", "PrometheusRule updated")
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusRuleKind, "update").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Don't enque just for the namespace
func (c *Operator) handleRuleDelete(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "PrometheusRule deleted")
c.triggerByCounter.WithLabelValues(monitoringv1.PrometheusRuleKind, "delete").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Do we need to enque secrets just for the namespace or in general?
func (c *Operator) handleSecretDelete(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "Secret deleted")
c.triggerByCounter.WithLabelValues("Secret", "delete").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
func (c *Operator) handleSecretUpdate(old, cur interface{}) {
if old.(*v1.Secret).ResourceVersion == cur.(*v1.Secret).ResourceVersion {
return
}
o, ok := c.getObject(cur)
if ok {
level.Debug(c.logger).Log("msg", "Secret updated")
c.triggerByCounter.WithLabelValues("Secret", "update").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
func (c *Operator) handleSecretAdd(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "Secret added")
c.triggerByCounter.WithLabelValues("Secret", "add").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
// TODO: Do we need to enque configmaps just for the namespace or in general?
func (c *Operator) handleConfigMapAdd(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "ConfigMap added")
c.triggerByCounter.WithLabelValues("ConfigMap", "add").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
func (c *Operator) handleConfigMapDelete(obj interface{}) {
o, ok := c.getObject(obj)
if ok {
level.Debug(c.logger).Log("msg", "ConfigMap deleted")
c.triggerByCounter.WithLabelValues("ConfigMap", "delete").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
func (c *Operator) handleConfigMapUpdate(old, cur interface{}) {
if old.(*v1.ConfigMap).ResourceVersion == cur.(*v1.ConfigMap).ResourceVersion {
return
}
o, ok := c.getObject(cur)
if ok {
level.Debug(c.logger).Log("msg", "ConfigMap updated")
c.triggerByCounter.WithLabelValues("ConfigMap", "update").Inc()
c.enqueueForNamespace(o.GetNamespace())
}
}
func (c *Operator) getObject(obj interface{}) (metav1.Object, bool) {
ts, ok := obj.(cache.DeletedFinalStateUnknown)
if ok {
obj = ts.Obj
}
o, err := meta.Accessor(obj)
if err != nil {
level.Error(c.logger).Log("msg", "get object failed", "err", err)
return nil, false
}
return o, true
}
// enqueue adds a key to the queue. If obj is a key already it gets added
// directly. Otherwise, the key is extracted via keyFunc.
func (c *Operator) enqueue(obj interface{}) {
if obj == nil {
return
}
key, ok := obj.(string)
if !ok {
key, ok = c.keyFunc(obj)
if !ok {
return
}
}
c.queue.Add(key)
}
// enqueueForNamespace enqueues all Prometheus object keys that belong to the
// given namespace or select objects in the given namespace.
func (c *Operator) enqueueForNamespace(nsName string) {
nsObject, exists, err := c.nsInf.GetStore().GetByKey(nsName)
if err != nil {
level.Error(c.logger).Log(
"msg", "get namespace to enqueue Prometheus instances failed",
"err", err,
)
return
}
if !exists {
level.Error(c.logger).Log(
"msg", fmt.Sprintf("get namespace to enqueue Prometheus instances failed: namespace %q does not exist", nsName),
"err", err,
)
return
}
ns := nsObject.(*v1.Namespace)
err = cache.ListAll(c.promInf.GetStore(), labels.Everything(), func(obj interface{}) {
// Check for Prometheus instances in the NS.
p := obj.(*monitoringv1.Prometheus)
if p.Namespace == nsName {
c.enqueue(p)
return
}
// Check for Prometheus instances selecting ServiceMonitors in
// the NS.
smNSSelector, err := metav1.LabelSelectorAsSelector(p.Spec.ServiceMonitorNamespaceSelector)
if err != nil {
level.Error(c.logger).Log(
"msg", fmt.Sprintf("failed to convert ServiceMonitorNamespaceSelector of %q to selector", p.Name),
"err", err,
)
return
}
if smNSSelector.Matches(labels.Set(ns.Labels)) {
c.enqueue(p)
return
}
// Check for Prometheus instances selecting PrometheusRules in
// the NS.
ruleNSSelector, err := metav1.LabelSelectorAsSelector(p.Spec.RuleNamespaceSelector)
if err != nil {
level.Error(c.logger).Log(
"msg", fmt.Sprintf("failed to convert RuleNamespaceSelector of %q to selector", p.Name),
"err", err,
)
return
}
if ruleNSSelector.Matches(labels.Set(ns.Labels)) {
c.enqueue(p)
return
}
})
if err != nil {
level.Error(c.logger).Log(
"msg", "listing all Prometheus instances from cache failed",
"err", err,
)
}
}
// worker runs a worker thread that just dequeues items, processes them, and
// marks them done. It enforces that the syncHandler is never invoked
// concurrently with the same key.
func (c *Operator) worker() {
for c.processNextWorkItem() {
}
}
func (c *Operator) processNextWorkItem() bool {
key, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(key)
err := c.sync(key.(string))
if err == nil {
c.queue.Forget(key)
return true
}
c.reconcileErrorsCounter.With(prometheus.Labels{}).Inc()
utilruntime.HandleError(errors.Wrap(err, fmt.Sprintf("Sync %q failed", key)))
c.queue.AddRateLimited(key)
return true
}
func (c *Operator) prometheusForStatefulSet(sset interface{}) *monitoringv1.Prometheus {
key, ok := c.keyFunc(sset)
if !ok {
return nil
}
promKey := statefulSetKeyToPrometheusKey(key)
p, exists, err := c.promInf.GetStore().GetByKey(promKey)
if err != nil {
level.Error(c.logger).Log("msg", "Prometheus lookup failed", "err", err)
return nil
}
if !exists {
return nil
}
return p.(*monitoringv1.Prometheus)
}
func prometheusNameFromStatefulSetName(name string) string {
return strings.TrimPrefix(name, "prometheus-")
}
func statefulSetNameFromPrometheusName(name string) string {
return "prometheus-" + name
}
func statefulSetKeyToPrometheusKey(key string) string {
keyParts := strings.Split(key, "/")
return keyParts[0] + "/" + strings.TrimPrefix(keyParts[1], "prometheus-")
}
func prometheusKeyToStatefulSetKey(key string) string {
keyParts := strings.Split(key, "/")
return keyParts[0] + "/prometheus-" + keyParts[1]
}
func (c *Operator) handleStatefulSetDelete(obj interface{}) {
if ps := c.prometheusForStatefulSet(obj); ps != nil {
level.Debug(c.logger).Log("msg", "StatefulSet delete")
c.triggerByCounter.WithLabelValues("StatefulSet", "delete").Inc()
c.enqueue(ps)
}
}
func (c *Operator) handleStatefulSetAdd(obj interface{}) {
if ps := c.prometheusForStatefulSet(obj); ps != nil {
level.Debug(c.logger).Log("msg", "StatefulSet added")
c.triggerByCounter.WithLabelValues("StatefulSet", "add").Inc()
c.enqueue(ps)
}
}
func (c *Operator) handleStatefulSetUpdate(oldo, curo interface{}) {
old := oldo.(*appsv1.StatefulSet)
cur := curo.(*appsv1.StatefulSet)
level.Debug(c.logger).Log("msg", "update handler", "old", old.ResourceVersion, "cur", cur.ResourceVersion)
// Periodic resync may resend the StatefulSet without changes
// in-between. Also breaks loops created by updating the resource
// ourselves.
if old.ResourceVersion == cur.ResourceVersion {
return
}
if ps := c.prometheusForStatefulSet(cur); ps != nil {
level.Debug(c.logger).Log("msg", "StatefulSet updated")
c.triggerByCounter.WithLabelValues("StatefulSet", "update").Inc()
c.enqueue(ps)
}
}
func (c *Operator) sync(key string) error {
obj, exists, err := c.promInf.GetIndexer().GetByKey(key)
if err != nil {
return err
}
if !exists {
// Dependent resources are cleaned up by K8s via OwnerReferences
return nil
}
p := obj.(*monitoringv1.Prometheus)
p = p.DeepCopy()
p.APIVersion = monitoringv1.SchemeGroupVersion.String()
p.Kind = monitoringv1.PrometheusesKind
if p.Spec.Paused {
return nil
}
level.Info(c.logger).Log("msg", "sync prometheus", "key", key)
ruleConfigMapNames, err := c.createOrUpdateRuleConfigMaps(p)
if err != nil {
return err
}
// If no service monitor selectors are configured, the user wants to
// manage configuration themselves.
if p.Spec.ServiceMonitorSelector != nil {
// We just always regenerate the configuration to be safe.
if err := c.createOrUpdateConfigurationSecret(p, ruleConfigMapNames); err != nil {
return errors.Wrap(err, "creating config failed")
}
}
// Create empty Secret if it doesn't exist. See comment above.
s, err := makeEmptyConfigurationSecret(p, c.config)
if err != nil {
return errors.Wrap(err, "generating empty config secret failed")
}
sClient := c.kclient.CoreV1().Secrets(p.Namespace)
_, err = sClient.Get(s.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
if _, err := c.kclient.Core().Secrets(p.Namespace).Create(s); err != nil && !apierrors.IsAlreadyExists(err) {
return errors.Wrap(err, "creating empty config file failed")
}
}
if !apierrors.IsNotFound(err) && err != nil {
return err
}