You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
go-zero/zrpc/resolver/internal/kubebuilder.go

87 lines
2.1 KiB
Go

package internal
import (
"context"
"fmt"
"time"
"github.com/zeromicro/go-zero/core/logx"
"github.com/zeromicro/go-zero/core/proc"
"github.com/zeromicro/go-zero/core/threading"
"github.com/zeromicro/go-zero/zrpc/resolver/internal/kube"
"google.golang.org/grpc/resolver"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
const (
resyncInterval = 5 * time.Minute
nameSelector = "metadata.name="
)
type kubeBuilder struct{}
func (b *kubeBuilder) Build(target resolver.Target, cc resolver.ClientConn,
_ resolver.BuildOptions) (resolver.Resolver, error) {
svc, err := kube.ParseTarget(target)
if err != nil {
return nil, err
}
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
cs, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
if svc.Port == 0 {
endpoints, err := cs.CoreV1().Endpoints(svc.Namespace).Get(context.Background(), svc.Name, v1.GetOptions{})
if err != nil {
return nil, err
}
svc.Port = int(endpoints.Subsets[0].Ports[0].Port)
}
handler := kube.NewEventHandler(func(endpoints []string) {
var addrs []resolver.Address
for _, val := range subset(endpoints, subsetSize) {
addrs = append(addrs, resolver.Address{
Addr: fmt.Sprintf("%s:%d", val, svc.Port),
})
}
if err := cc.UpdateState(resolver.State{
Addresses: addrs,
}); err != nil {
logx.Error(err)
}
})
inf := informers.NewSharedInformerFactoryWithOptions(cs, resyncInterval,
informers.WithNamespace(svc.Namespace),
informers.WithTweakListOptions(func(options *v1.ListOptions) {
options.FieldSelector = nameSelector + svc.Name
}))
in := inf.Core().V1().Endpoints()
in.Informer().AddEventHandler(handler)
threading.GoSafe(func() {
inf.Start(proc.Done())
})
endpoints, err := cs.CoreV1().Endpoints(svc.Namespace).Get(context.Background(), svc.Name, v1.GetOptions{})
if err != nil {
return nil, err
}
handler.Update(endpoints)
return &nopResolver{cc: cc}, nil
}
func (b *kubeBuilder) Scheme() string {
return KubernetesScheme
}