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endpoints.go
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/
endpoints.go
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package k8s
import (
"context"
"fmt"
"net/url"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// GetEndpointsFunc is a type that represents a function that can
// fetch endpoints
type GetEndpointsFunc func(
ctx context.Context,
namespace,
serviceName string,
) (*v1.Endpoints, error)
func EndpointsForService(
ctx context.Context,
ns,
serviceName,
servicePort string,
endpointsFn GetEndpointsFunc,
) ([]*url.URL, error) {
endpoints, err := endpointsFn(ctx, ns, serviceName)
if err != nil {
return nil, fmt.Errorf("pkg.k8s.EndpointsForService: %w", err)
}
ret := []*url.URL{}
for _, subset := range endpoints.Subsets {
for _, addr := range subset.Addresses {
u, err := url.Parse(
fmt.Sprintf("http://%s:%s", addr.IP, servicePort),
)
if err != nil {
return nil, err
}
ret = append(ret, u)
}
}
return ret, nil
}
// EndpointsFuncForControllerClient returns a new GetEndpointsFunc
// that uses the controller-runtime client.Client to fetch endpoints
func EndpointsFuncForControllerClient(
cl client.Client,
) GetEndpointsFunc {
return func(
ctx context.Context,
namespace,
serviceName string,
) (*v1.Endpoints, error) {
endpts := &v1.Endpoints{}
if err := cl.Get(ctx, client.ObjectKey{
Namespace: namespace,
Name: serviceName,
}, endpts); err != nil {
return nil, err
}
return endpts, nil
}
}
func EndpointsFuncForK8sClientset(
cl *kubernetes.Clientset,
) GetEndpointsFunc {
return func(
ctx context.Context,
namespace,
serviceName string,
) (*v1.Endpoints, error) {
endpointsCl := cl.CoreV1().Endpoints(namespace)
return endpointsCl.Get(ctx, serviceName, metav1.GetOptions{})
}
}