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node.go
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node.go
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//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// 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
//
// https://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 node provides kubernetes node information and preriodically update
package node
import (
"context"
"time"
"github.com/vdaas/vald/internal/k8s"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
metrics "k8s.io/metrics/pkg/apis/metrics/v1beta1"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
type NodeWatcher k8s.ResourceController
type reconciler struct {
ctx context.Context
mgr manager.Manager
name string
onError func(err error)
onReconcile func(nodeList map[string]Node)
}
type Node struct {
Name string
CPU float64
Mem float64
Pods int64
Storage int64
}
func New(opts ...Option) NodeWatcher {
r := new(reconciler)
for _, opt := range opts {
opt(r)
}
return r
}
func (r *reconciler) Reconcile(req reconcile.Request) (res reconcile.Result, err error) {
m := &metrics.NodeMetricsList{}
err = r.mgr.GetClient().List(r.ctx, m)
if err != nil {
if r.onError != nil {
r.onError(err)
}
res = reconcile.Result{
Requeue: true,
RequeueAfter: time.Millisecond * 100,
}
if errors.IsNotFound(err) {
res = reconcile.Result{
Requeue: true,
RequeueAfter: time.Second,
}
}
return
}
nodes := make(map[string]Node, len(m.Items))
for _, node := range m.Items {
nodeName := node.GetName()
nodes[nodeName] = Node{
Name: nodeName,
CPU: float64(node.Usage.Cpu().Value()),
Mem: float64(node.Usage.Memory().Value()),
Storage: node.Usage.StorageEphemeral().Value(),
Pods: node.Usage.Pods().Value(),
}
}
if r.onReconcile != nil {
r.onReconcile(nodes)
}
return
}
func (r *reconciler) GetName() string {
return r.name
}
func (r *reconciler) NewReconciler(ctx context.Context, mgr manager.Manager) reconcile.Reconciler {
if r.ctx == nil && ctx != nil {
r.ctx = ctx
}
if r.mgr == nil && mgr != nil {
r.mgr = mgr
}
metrics.AddToScheme(r.mgr.GetScheme())
return r
}
func (r *reconciler) For() runtime.Object {
// WARN: metrics should be renew
// https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/resource-metrics-api.md#further-improvements
return new(metrics.NodeMetrics)
}
func (r *reconciler) Owns() runtime.Object {
// return new(metrics.PodMetrics)
return nil
}
func (r *reconciler) Watches() (*source.Kind, handler.EventHandler) {
// return &source.Kind{Type: new(metrics.NodeMetrics)}, &handler.EnqueueRequestForObject{}
return nil, nil
}