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pod.go
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pod.go
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// 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 (
"fmt"
"net"
"strconv"
"strings"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/util/strutil"
"golang.org/x/net/context"
"k8s.io/client-go/1.5/pkg/api"
apiv1 "k8s.io/client-go/1.5/pkg/api/v1"
"k8s.io/client-go/1.5/tools/cache"
)
// Pod discovers new pod targets.
type Pod struct {
informer cache.SharedInformer
store cache.Store
logger log.Logger
}
// NewPod creates a new pod discovery.
func NewPod(l log.Logger, pods cache.SharedInformer) *Pod {
return &Pod{
informer: pods,
store: pods.GetStore(),
logger: l,
}
}
// Run implements the TargetProvider interface.
func (p *Pod) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
// Send full initial set of pod targets.
var initial []*config.TargetGroup
for _, o := range p.store.List() {
tg := p.buildPod(o.(*apiv1.Pod))
initial = append(initial, tg)
p.logger.With("tg", fmt.Sprintf("%#v", tg)).Debugln("initial pod")
}
select {
case <-ctx.Done():
return
case ch <- initial:
}
// Send target groups for pod updates.
send := func(tg *config.TargetGroup) {
p.logger.With("tg", fmt.Sprintf("%#v", tg)).Debugln("pod update")
select {
case <-ctx.Done():
case ch <- []*config.TargetGroup{tg}:
}
}
p.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(o interface{}) {
send(p.buildPod(o.(*apiv1.Pod)))
},
DeleteFunc: func(o interface{}) {
send(&config.TargetGroup{Source: podSource(o.(*apiv1.Pod))})
},
UpdateFunc: func(_, o interface{}) {
send(p.buildPod(o.(*apiv1.Pod)))
},
})
// Block until the target provider is explicitly canceled.
<-ctx.Done()
}
const (
podNameLabel = metaLabelPrefix + "pod_name"
podIPLabel = metaLabelPrefix + "pod_ip"
podContainerNameLabel = metaLabelPrefix + "pod_container_name"
podContainerPortNameLabel = metaLabelPrefix + "pod_container_port_name"
podContainerPortNumberLabel = metaLabelPrefix + "pod_container_port_number"
podContainerPortProtocolLabel = metaLabelPrefix + "pod_container_port_protocol"
podReadyLabel = metaLabelPrefix + "pod_ready"
podLabelPrefix = metaLabelPrefix + "pod_label_"
podAnnotationPrefix = metaLabelPrefix + "pod_annotation_"
podNodeNameLabel = metaLabelPrefix + "pod_node_name"
podHostIPLabel = metaLabelPrefix + "pod_host_ip"
)
func podLabels(pod *apiv1.Pod) model.LabelSet {
ls := model.LabelSet{
podNameLabel: lv(pod.ObjectMeta.Name),
podIPLabel: lv(pod.Status.PodIP),
podReadyLabel: podReady(pod),
podNodeNameLabel: lv(pod.Spec.NodeName),
podHostIPLabel: lv(pod.Status.HostIP),
}
for k, v := range pod.Labels {
ln := strutil.SanitizeLabelName(podLabelPrefix + k)
ls[model.LabelName(ln)] = lv(v)
}
for k, v := range pod.Annotations {
ln := strutil.SanitizeLabelName(podAnnotationPrefix + k)
ls[model.LabelName(ln)] = lv(v)
}
return ls
}
func (p *Pod) buildPod(pod *apiv1.Pod) *config.TargetGroup {
// During startup the pod may not have an IP yet. This does not even allow
// for an up metric, so we skip the target.
if len(pod.Status.PodIP) == 0 {
return nil
}
tg := &config.TargetGroup{
Source: podSource(pod),
}
tg.Labels = podLabels(pod)
tg.Labels[namespaceLabel] = lv(pod.Namespace)
for _, c := range pod.Spec.Containers {
// If no ports are defined for the container, create an anonymous
// target per container.
if len(c.Ports) == 0 {
// We don't have a port so we just set the address label to the pod IP.
// The user has to add a port manually.
tg.Targets = append(tg.Targets, model.LabelSet{
model.AddressLabel: lv(pod.Status.PodIP),
podContainerNameLabel: lv(c.Name),
})
continue
}
// Otherwise create one target for each container/port combination.
for _, port := range c.Ports {
ports := strconv.FormatUint(uint64(port.ContainerPort), 10)
addr := net.JoinHostPort(pod.Status.PodIP, ports)
tg.Targets = append(tg.Targets, model.LabelSet{
model.AddressLabel: lv(addr),
podContainerNameLabel: lv(c.Name),
podContainerPortNumberLabel: lv(ports),
podContainerPortNameLabel: lv(port.Name),
podContainerPortProtocolLabel: lv(string(port.Protocol)),
})
}
}
return tg
}
func podSource(pod *apiv1.Pod) string {
return "pod/" + pod.Namespace + "/" + pod.Name
}
func podReady(pod *apiv1.Pod) model.LabelValue {
for _, cond := range pod.Status.Conditions {
if cond.Type == apiv1.PodReady {
return lv(strings.ToLower(string(cond.Status)))
}
}
return lv(strings.ToLower(string(api.ConditionUnknown)))
}