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lookup.go
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lookup.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package k8s
import (
log "github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"github.com/projectcalico/libcalico-go/lib/set"
)
func NewK8sAPI() *RealK8sAPI {
return &RealK8sAPI{}
}
type RealK8sAPI struct {
cachedClientSet *kubernetes.Clientset
}
func (r *RealK8sAPI) clientSet() (*kubernetes.Clientset, error) {
if r.cachedClientSet == nil {
// TODO Typha: support Typha lookup without using rest.InClusterConfig().
k8sconf, err := rest.InClusterConfig()
if err != nil {
log.WithError(err).Error("Unable to create Kubernetes config.")
return nil, err
}
clientSet, err := kubernetes.NewForConfig(k8sconf)
if err != nil {
log.WithError(err).Error("Unable to create Kubernetes client set.")
return nil, err
}
r.cachedClientSet = clientSet
}
return r.cachedClientSet, nil
}
func (r *RealK8sAPI) GetNumTyphas(namespace, serviceName, portName string) (int, error) {
clientSet, err := r.clientSet()
if err != nil {
return 0, err
}
epClient := clientSet.CoreV1().Endpoints(namespace)
ep, err := epClient.Get(serviceName, v1.GetOptions{})
if err != nil {
log.WithError(err).Error("Failed to get Typha endpoint from Kubernetes")
}
ips := set.New()
for _, s := range ep.Subsets {
found := false
for _, port := range s.Ports {
if port.Name == portName {
found = true
break
}
}
if found {
for _, ip := range s.Addresses {
ips.Add(ip.IP)
}
}
}
return ips.Len(), nil
}
func (r *RealK8sAPI) GetNumNodes() (int, error) {
clientSet, err := r.clientSet()
if err != nil {
return 0, err
}
noClient := clientSet.CoreV1().Nodes()
list, err := noClient.List(v1.ListOptions{})
if err != nil {
return 0, err
}
return len(list.Items), nil
}