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discover_apiserver_endpoints.go
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discover_apiserver_endpoints.go
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/*
Copyright 2021 Flant JSC
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 hooks
import (
"errors"
"fmt"
"net"
"strconv"
"github.com/flant/addon-operator/pkg/module_manager/go_hook"
"github.com/flant/addon-operator/sdk"
"github.com/flant/shell-operator/pkg/kube_events_manager/types"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"github.com/deckhouse/deckhouse/go_lib/set"
)
const apiserverPort = 6443
var _ = sdk.RegisterFunc(&go_hook.HookConfig{
Queue: "/modules/node-manager",
Kubernetes: []go_hook.KubernetesConfig{
{
Name: "kube_apiserver",
ApiVersion: "v1",
Kind: "Pod",
LabelSelector: &metav1.LabelSelector{
MatchLabels: map[string]string{
"component": "kube-apiserver",
"tier": "control-plane",
},
},
NamespaceSelector: &types.NamespaceSelector{
NameSelector: &types.NameSelector{
MatchNames: []string{"kube-system"},
},
},
FilterFunc: apiserverPodFilter,
},
{
Name: "apiserver_endpoints",
ApiVersion: "v1",
Kind: "Endpoints",
NamespaceSelector: &types.NamespaceSelector{
NameSelector: &types.NameSelector{
MatchNames: []string{"default"},
},
},
NameSelector: &types.NameSelector{
MatchNames: []string{"kubernetes"},
},
FilterFunc: apiEndpointsFilter,
},
},
}, handleAPIEndpoints)
func apiserverPodFilter(obj *unstructured.Unstructured) (go_hook.FilterResult, error) {
var isReady bool
pod := &corev1.Pod{}
err := sdk.FromUnstructured(obj, pod)
if err != nil {
return nil, fmt.Errorf("cannot parse pod object from unstructured: %v", err)
}
for _, cond := range pod.Status.Conditions {
if cond.Type == corev1.PodReady && cond.Status == corev1.ConditionTrue {
isReady = true
break
}
}
if !isReady {
return "", nil
}
return fmt.Sprintf("%s:%d", pod.Status.PodIP, apiserverPort), nil
}
func apiEndpointsFilter(obj *unstructured.Unstructured) (go_hook.FilterResult, error) {
var endpoints corev1.Endpoints
err := sdk.FromUnstructured(obj, &endpoints)
if err != nil {
return nil, err
}
addresses := make([]string, 0)
for _, s := range endpoints.Subsets {
ports := make([]int32, 0)
for _, port := range s.Ports {
if port.Name == "https" {
ports = append(ports, port.Port)
}
}
for _, addrObj := range s.Addresses {
for _, port := range ports {
addr := net.JoinHostPort(addrObj.IP, strconv.Itoa(int(port)))
addresses = append(addresses, addr)
}
}
}
return addresses, nil
}
func handleAPIEndpoints(input *go_hook.HookInput) error {
endpointsSet := set.NewFromSnapshot(input.Snapshots["kube_apiserver"])
for _, ep := range input.Snapshots["apiserver_endpoints"] {
endpointsSet.Add(ep.([]string)...)
}
endpointsSet.Delete("") // clean faulty pods
endpointsList := endpointsSet.Slice() // sorted
if len(endpointsList) == 0 {
return errors.New("no kubernetes apiserver endpoints host:port specified")
}
input.Values.Set("nodeManager.internal.clusterMasterAddresses", endpointsList)
return nil
}