/
kube_refresher.go
128 lines (109 loc) · 3.32 KB
/
kube_refresher.go
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package kube
import (
"context"
"time"
"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
xlog "github.com/envoyproxy/go-control-plane/pkg/log"
"github.com/envoyproxy/go-control-plane/pkg/resource/v3"
"github.com/rs/zerolog/log"
"github.com/xmlking/toolkit/xds/api"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/global"
"go.opentelemetry.io/otel/metric/unit"
"golang.org/x/sync/errgroup"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
type kubeRefresher struct {
refreshInterval time.Duration
ctx context.Context
nodeID string
client kubernetes.Interface
namespace string
servicesCache cache.SnapshotCache
endpointsCache cache.SnapshotCache
muxCache cache.Cache
telemetry bool
snapshots metric.Int64Counter
errors metric.Int64Counter
}
var _ api.Refresher = (*kubeRefresher)(nil)
func mapTypeURL(typeURL string) string {
switch typeURL {
case resource.ListenerType, resource.RouteType, resource.ClusterType:
return "services"
case resource.EndpointType:
return "endpoints"
default:
return ""
}
}
func NewKubeRefresher(ctx context.Context, refreshInterval time.Duration, nodeID string, namespace string, logger xlog.Logger) api.Refresher {
meter := global.Meter("otel-dns-refresher")
clientConfig, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(clientcmd.NewDefaultClientConfigLoadingRules(), nil).ClientConfig()
if err != nil {
log.Fatal().Stack().Err(err).Str("component", "xds").Msg("Fail to create Kubernetes client config")
}
k8sClient, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
log.Fatal().Stack().Err(err).Str("component", "xds").Msg("Fail to create Kubernetes client")
}
servicesCache := cache.NewSnapshotCache(false, cache.IDHash{}, logger)
endpointsCache := cache.NewSnapshotCache(false, cache.IDHash{}, logger)
muxCache := cache.MuxCache{
Classify: func(r *cache.Request) string {
return mapTypeURL(r.TypeUrl)
},
ClassifyDelta: func(r *cache.DeltaRequest) string {
return mapTypeURL(r.TypeUrl)
},
Caches: map[string]cache.Cache{
"services": servicesCache,
"endpoints": endpointsCache,
},
}
k8r := &kubeRefresher{
ctx: ctx,
refreshInterval: refreshInterval,
nodeID: nodeID,
client: k8sClient,
namespace: namespace,
servicesCache: servicesCache,
endpointsCache: endpointsCache,
muxCache: &muxCache,
}
k8r.snapshots, err = meter.NewInt64Counter(
"snapshots",
metric.WithDescription("Number of snapshots generated by xds-controller"),
metric.WithUnit(unit.Dimensionless),
)
if err != nil {
log.Warn().Err(err).Str("component", "xds").Msg("Telemetry not enabled")
} else {
k8r.telemetry = true
}
k8r.errors, err = meter.NewInt64Counter(
"errors",
metric.WithDescription("Number of errors happened in xds-controller"),
metric.WithUnit(unit.Dimensionless),
)
if err != nil {
log.Warn().Err(err).Str("component", "xds").Msg("Telemetry not enabled")
} else {
k8r.telemetry = true
}
return k8r
}
func (k *kubeRefresher) GetCache() cache.Cache {
return k.muxCache
}
func (k *kubeRefresher) Start() error {
group, groupCtx := errgroup.WithContext(k.ctx)
group.Go(func() error {
return k.startServices(groupCtx)
})
group.Go(func() error {
return k.startEndpoints(groupCtx)
})
return group.Wait()
}