mirror of https://github.com/prometheus/prometheus
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
203 lines
5.5 KiB
203 lines
5.5 KiB
// Copyright 2016 The Prometheus 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 kubernetes |
|
|
|
import ( |
|
"context" |
|
"errors" |
|
"fmt" |
|
"net" |
|
"strconv" |
|
|
|
"github.com/go-kit/log" |
|
"github.com/go-kit/log/level" |
|
"github.com/prometheus/client_golang/prometheus" |
|
"github.com/prometheus/common/model" |
|
apiv1 "k8s.io/api/core/v1" |
|
"k8s.io/client-go/tools/cache" |
|
"k8s.io/client-go/util/workqueue" |
|
|
|
"github.com/prometheus/prometheus/discovery/targetgroup" |
|
) |
|
|
|
// Service implements discovery of Kubernetes services. |
|
type Service struct { |
|
logger log.Logger |
|
informer cache.SharedInformer |
|
store cache.Store |
|
queue *workqueue.Type |
|
} |
|
|
|
// NewService returns a new service discovery. |
|
func NewService(l log.Logger, inf cache.SharedInformer, eventCount *prometheus.CounterVec) *Service { |
|
if l == nil { |
|
l = log.NewNopLogger() |
|
} |
|
|
|
svcAddCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleAdd) |
|
svcUpdateCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleUpdate) |
|
svcDeleteCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleDelete) |
|
|
|
s := &Service{ |
|
logger: l, |
|
informer: inf, |
|
store: inf.GetStore(), |
|
queue: workqueue.NewNamed(RoleService.String()), |
|
} |
|
|
|
_, err := s.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{ |
|
AddFunc: func(o interface{}) { |
|
svcAddCount.Inc() |
|
s.enqueue(o) |
|
}, |
|
DeleteFunc: func(o interface{}) { |
|
svcDeleteCount.Inc() |
|
s.enqueue(o) |
|
}, |
|
UpdateFunc: func(_, o interface{}) { |
|
svcUpdateCount.Inc() |
|
s.enqueue(o) |
|
}, |
|
}) |
|
if err != nil { |
|
level.Error(l).Log("msg", "Error adding services event handler.", "err", err) |
|
} |
|
return s |
|
} |
|
|
|
func (s *Service) enqueue(obj interface{}) { |
|
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj) |
|
if err != nil { |
|
return |
|
} |
|
|
|
s.queue.Add(key) |
|
} |
|
|
|
// Run implements the Discoverer interface. |
|
func (s *Service) Run(ctx context.Context, ch chan<- []*targetgroup.Group) { |
|
defer s.queue.ShutDown() |
|
|
|
if !cache.WaitForCacheSync(ctx.Done(), s.informer.HasSynced) { |
|
if !errors.Is(ctx.Err(), context.Canceled) { |
|
level.Error(s.logger).Log("msg", "service informer unable to sync cache") |
|
} |
|
return |
|
} |
|
|
|
go func() { |
|
for s.process(ctx, ch) { |
|
} |
|
}() |
|
|
|
// Block until the target provider is explicitly canceled. |
|
<-ctx.Done() |
|
} |
|
|
|
func (s *Service) process(ctx context.Context, ch chan<- []*targetgroup.Group) bool { |
|
keyObj, quit := s.queue.Get() |
|
if quit { |
|
return false |
|
} |
|
defer s.queue.Done(keyObj) |
|
key := keyObj.(string) |
|
|
|
namespace, name, err := cache.SplitMetaNamespaceKey(key) |
|
if err != nil { |
|
return true |
|
} |
|
|
|
o, exists, err := s.store.GetByKey(key) |
|
if err != nil { |
|
return true |
|
} |
|
if !exists { |
|
send(ctx, ch, &targetgroup.Group{Source: serviceSourceFromNamespaceAndName(namespace, name)}) |
|
return true |
|
} |
|
eps, err := convertToService(o) |
|
if err != nil { |
|
level.Error(s.logger).Log("msg", "converting to Service object failed", "err", err) |
|
return true |
|
} |
|
send(ctx, ch, s.buildService(eps)) |
|
return true |
|
} |
|
|
|
func convertToService(o interface{}) (*apiv1.Service, error) { |
|
service, ok := o.(*apiv1.Service) |
|
if ok { |
|
return service, nil |
|
} |
|
return nil, fmt.Errorf("received unexpected object: %v", o) |
|
} |
|
|
|
func serviceSource(s *apiv1.Service) string { |
|
return serviceSourceFromNamespaceAndName(s.Namespace, s.Name) |
|
} |
|
|
|
func serviceSourceFromNamespaceAndName(namespace, name string) string { |
|
return "svc/" + namespace + "/" + name |
|
} |
|
|
|
const ( |
|
servicePortNameLabel = metaLabelPrefix + "service_port_name" |
|
servicePortNumberLabel = metaLabelPrefix + "service_port_number" |
|
servicePortProtocolLabel = metaLabelPrefix + "service_port_protocol" |
|
serviceClusterIPLabel = metaLabelPrefix + "service_cluster_ip" |
|
serviceLoadBalancerIP = metaLabelPrefix + "service_loadbalancer_ip" |
|
serviceExternalNameLabel = metaLabelPrefix + "service_external_name" |
|
serviceType = metaLabelPrefix + "service_type" |
|
) |
|
|
|
func serviceLabels(svc *apiv1.Service) model.LabelSet { |
|
ls := make(model.LabelSet) |
|
ls[namespaceLabel] = lv(svc.Namespace) |
|
addObjectMetaLabels(ls, svc.ObjectMeta, RoleService) |
|
|
|
return ls |
|
} |
|
|
|
func (s *Service) buildService(svc *apiv1.Service) *targetgroup.Group { |
|
tg := &targetgroup.Group{ |
|
Source: serviceSource(svc), |
|
} |
|
tg.Labels = serviceLabels(svc) |
|
|
|
for _, port := range svc.Spec.Ports { |
|
addr := net.JoinHostPort(svc.Name+"."+svc.Namespace+".svc", strconv.FormatInt(int64(port.Port), 10)) |
|
|
|
labelSet := model.LabelSet{ |
|
model.AddressLabel: lv(addr), |
|
servicePortNameLabel: lv(port.Name), |
|
servicePortNumberLabel: lv(strconv.FormatInt(int64(port.Port), 10)), |
|
servicePortProtocolLabel: lv(string(port.Protocol)), |
|
serviceType: lv(string(svc.Spec.Type)), |
|
} |
|
|
|
if svc.Spec.Type == apiv1.ServiceTypeExternalName { |
|
labelSet[serviceExternalNameLabel] = lv(svc.Spec.ExternalName) |
|
} else { |
|
labelSet[serviceClusterIPLabel] = lv(svc.Spec.ClusterIP) |
|
} |
|
|
|
if svc.Spec.Type == apiv1.ServiceTypeLoadBalancer { |
|
labelSet[serviceLoadBalancerIP] = lv(svc.Spec.LoadBalancerIP) |
|
} |
|
|
|
tg.Targets = append(tg.Targets, labelSet) |
|
} |
|
|
|
return tg |
|
}
|
|
|