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watcher.go
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watcher.go
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package main
import (
"log"
//"reflect"
"github.com/prometheus/client_golang/prometheus"
core "k8s.io/api/core/v1"
watch "k8s.io/apimachinery/pkg/watch"
)
// Metrics
var (
WatcherCommonLabels = []string{"Service"}
eventsSeen = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: "Watcher",
Name: "events",
Help: "Number of Events seen by this Service",
},
WatcherCommonLabels,
)
channelClosed = prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: "Watcher",
Name: "channelClosed",
Help: "Number of times the watch has closed",
},
WatcherCommonLabels,
)
readyIPs = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: "Watcher",
Name: "readyIPs",
Help: "Number of IPs that are ready from this service",
},
WatcherCommonLabels,
)
lastWatchEvent = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: "Watcher",
Name: "lastUpdated",
Help: "Last event from this service",
},
WatcherCommonLabels,
)
)
func init() {
prometheus.MustRegister(eventsSeen, readyIPs, lastWatchEvent)
}
// A Watcher observes changes to a kubernetes service (Endpoints) and updates a TargetGroup with the healthy hosts.
type Watcher struct {
Service string
port int64
portName string
tg *TargetGroup
isOtherVpc bool
}
func (w *Watcher) GetReadyIPsFromEndpoint(e *core.Endpoints) (ips TargetSet) {
ips = make(TargetSet)
for _, subset := range e.Subsets {
// Check if we're in the right port. Uncertain if a port can show up in multiple subsets, but we should deal with that possibility.
var thisPort bool
for _, port := range subset.Ports {
if port.Name == w.portName || int64(port.Port) == w.port {
thisPort = true
}
}
thisPort = true
if thisPort {
for _, address := range subset.Addresses {
ips[address.IP] = true
}
}
}
readyIPs.With(w.MetricLabels()).Set(float64(len(ips)))
return
}
func (w *Watcher) Watch(events <-chan watch.Event) {
for event := range events {
endpoint := event.Object.(*core.Endpoints)
if endpoint.Name == w.Service {
eventsSeen.With(w.MetricLabels()).Inc()
log.Println(endpoint.Name, w.GetReadyIPsFromEndpoint(endpoint))
w.tg.Update(w.GetReadyIPsFromEndpoint(endpoint), w.isOtherVpc)
lastWatchEvent.With(w.MetricLabels()).SetToCurrentTime()
}
}
log.Println("Watch channel closed")
}
func (w *Watcher) MetricLabels() (l prometheus.Labels) {
l = make(prometheus.Labels)
l["Service"] = w.Service
return
}