/
endpoints.go
174 lines (148 loc) · 4.74 KB
/
endpoints.go
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package snapshot
import (
"context"
"fmt"
"sort"
corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
endpointv3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
"github.com/envoyproxy/go-control-plane/pkg/cache/types"
"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
"github.com/wongnai/xds/meter"
"go.opentelemetry.io/otel/metric"
"google.golang.org/protobuf/types/known/wrapperspb"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
k8scache "k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
)
type endpointCacheItem struct {
version string
resources []types.Resource
}
func (s *Snapshotter) startEndpoints(ctx context.Context) error {
emit := func() {}
store := k8scache.NewUndeltaStore(func(v []interface{}) {
emit()
}, k8scache.DeletionHandlingMetaNamespaceKeyFunc)
reflector := k8scache.NewReflector(&k8scache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return s.client.CoreV1().Endpoints("").List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return s.client.CoreV1().Endpoints("").Watch(ctx, options)
},
}, &corev1.Endpoints{}, store, s.ResyncPeriod)
var lastSnapshotHash uint64
emit = func() {
version := reflector.LastSyncResourceVersion()
s.kubeEventCounter.Add(ctx, 1, metric.WithAttributes(meter.ResourceAttrKey.String("endpoints")))
endpoints := sliceToEndpoints(store.List())
endpointsResources := s.kubeEndpointsToResources(endpoints)
hash, err := resourcesHash(endpointsResources)
if err == nil {
if hash == lastSnapshotHash {
klog.V(4).Info("new snapshot is equivalent to the previous one")
return
}
lastSnapshotHash = hash
} else {
klog.Errorf("fail to hash snapshot: %s", err)
}
resourcesByType := resourcesToMap(endpointsResources)
s.setEndpointResourcesByType(resourcesByType)
snapshot, err := cache.NewSnapshot(version, resourcesByType)
if err != nil {
panic(err)
}
s.endpointsCache.SetSnapshot(ctx, "", snapshot)
}
reflector.Run(ctx.Done())
return nil
}
func sliceToEndpoints(s []interface{}) []*corev1.Endpoints {
out := make([]*corev1.Endpoints, len(s))
for i, v := range s {
out[i] = v.(*corev1.Endpoints)
}
return out
}
// kubeServicesToResources convert list of Kubernetes endpoints to Endpoint
func (s *Snapshotter) kubeEndpointsToResources(endpoints []*corev1.Endpoints) []types.Resource {
var out []types.Resource
for _, ep := range endpoints {
out = append(out, s.kubeEndpointToResources(ep)...)
}
return out
}
func (s *Snapshotter) kubeEndpointToResources(ep *corev1.Endpoints) []types.Resource {
name, err := k8scache.MetaNamespaceKeyFunc(ep)
if err != nil {
klog.Errorf("fail to get object key: %s", err)
return nil
}
if val, ok := s.endpointResourceCache[name]; ok && val.version == ep.ResourceVersion {
return val.resources
}
var out []types.Resource
for _, subset := range ep.Subsets {
for _, port := range subset.Ports {
var portName string
if port.Name == "" {
portName = fmt.Sprintf("%s.%s:%d", ep.Name, ep.Namespace, port.Port)
} else {
portName = fmt.Sprintf("%s.%s:%s", ep.Name, ep.Namespace, port.Name)
}
cla := &endpointv3.ClusterLoadAssignment{
ClusterName: portName,
Endpoints: []*endpointv3.LocalityLbEndpoints{
{
LoadBalancingWeight: wrapperspb.UInt32(1),
Locality: &corev3.Locality{},
LbEndpoints: []*endpointv3.LbEndpoint{},
},
},
}
out = append(out, cla)
sortedAddresses := subset.Addresses
sort.SliceStable(sortedAddresses, func(i, j int) bool {
l := sortedAddresses[i].IP
r := sortedAddresses[j].IP
return l < r
})
for _, addr := range sortedAddresses {
hostname := addr.Hostname
if hostname == "" && addr.TargetRef != nil {
hostname = fmt.Sprintf("%s.%s", addr.TargetRef.Name, addr.TargetRef.Namespace)
}
if hostname == "" && addr.NodeName != nil {
hostname = *addr.NodeName
}
cla.Endpoints[0].LbEndpoints = append(cla.Endpoints[0].LbEndpoints, &endpointv3.LbEndpoint{
HostIdentifier: &endpointv3.LbEndpoint_Endpoint{
Endpoint: &endpointv3.Endpoint{
Address: &corev3.Address{
Address: &corev3.Address_SocketAddress{
SocketAddress: &corev3.SocketAddress{
Protocol: corev3.SocketAddress_TCP,
Address: addr.IP,
PortSpecifier: &corev3.SocketAddress_PortValue{
PortValue: uint32(port.Port),
},
},
},
},
Hostname: hostname,
},
},
})
}
}
}
s.endpointResourceCache[name] = endpointCacheItem{
version: ep.ResourceVersion,
resources: out,
}
return out
}