230 lines
6.9 KiB
Go
230 lines
6.9 KiB
Go
// Copyright 2019 the Kilo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package k8s
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"path"
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"strings"
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"time"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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v1informers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/kubernetes"
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v1listers "k8s.io/client-go/listers/core/v1"
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"k8s.io/client-go/tools/cache"
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"github.com/squat/kilo/pkg/mesh"
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)
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const (
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// Backend is the name of this mesh backend.
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Backend = "kubernetes"
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externalIPAnnotationKey = "kilo.squat.ai/external-ip"
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forceExternalIPAnnotationKey = "kilo.squat.ai/force-external-ip"
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internalIPAnnotationKey = "kilo.squat.ai/internal-ip"
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keyAnnotationKey = "kilo.squat.ai/key"
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leaderAnnotationKey = "kilo.squat.ai/leader"
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locationAnnotationKey = "kilo.squat.ai/location"
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regionLabelKey = "failure-domain.beta.kubernetes.io/region"
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jsonPatchSlash = "~1"
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jsonRemovePatch = `{"op": "remove", "path": "%s"}`
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)
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type backend struct {
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client kubernetes.Interface
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events chan *mesh.Event
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informer cache.SharedIndexInformer
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lister v1listers.NodeLister
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}
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// New creates a new instance of a mesh.Backend.
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func New(client kubernetes.Interface) mesh.Backend {
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informer := v1informers.NewNodeInformer(client, 5*time.Minute, nil)
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b := &backend{
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client: client,
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events: make(chan *mesh.Event),
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informer: informer,
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lister: v1listers.NewNodeLister(informer.GetIndexer()),
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}
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return b
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}
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// CleanUp removes configuration applied to the backend.
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func (b *backend) CleanUp(name string) error {
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patch := []byte("[" + strings.Join([]string{
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fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(externalIPAnnotationKey, "/", jsonPatchSlash, 1))),
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fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(internalIPAnnotationKey, "/", jsonPatchSlash, 1))),
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fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(keyAnnotationKey, "/", jsonPatchSlash, 1))),
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}, ",") + "]")
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if _, err := b.client.CoreV1().Nodes().Patch(name, types.JSONPatchType, patch); err != nil {
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return fmt.Errorf("failed to patch node: %v", err)
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}
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return nil
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}
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// Get gets a single Node by name.
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func (b *backend) Get(name string) (*mesh.Node, error) {
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n, err := b.lister.Get(name)
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if err != nil {
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return nil, err
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}
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return translateNode(n), nil
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}
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// Init initializes the backend; for this backend that means
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// syncing the informer cache.
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func (b *backend) Init(stop <-chan struct{}) error {
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go b.informer.Run(stop)
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if ok := cache.WaitForCacheSync(stop, func() bool {
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return b.informer.HasSynced()
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}); !ok {
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return errors.New("failed to start sync node cache")
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}
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b.informer.AddEventHandler(
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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n, ok := obj.(*v1.Node)
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if !ok {
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// Failed to decode Node; ignoring...
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return
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}
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b.events <- &mesh.Event{Type: mesh.AddEvent, Node: translateNode(n)}
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},
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UpdateFunc: func(_, obj interface{}) {
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n, ok := obj.(*v1.Node)
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if !ok {
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// Failed to decode Node; ignoring...
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return
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}
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b.events <- &mesh.Event{Type: mesh.UpdateEvent, Node: translateNode(n)}
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},
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DeleteFunc: func(obj interface{}) {
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n, ok := obj.(*v1.Node)
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if !ok {
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// Failed to decode Node; ignoring...
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return
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}
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b.events <- &mesh.Event{Type: mesh.DeleteEvent, Node: translateNode(n)}
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},
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},
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)
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return nil
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}
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// List gets all the Nodes in the cluster.
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func (b *backend) List() ([]*mesh.Node, error) {
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ns, err := b.lister.List(labels.Everything())
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if err != nil {
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return nil, err
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}
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nodes := make([]*mesh.Node, len(ns))
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for i := range ns {
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nodes[i] = translateNode(ns[i])
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}
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return nodes, nil
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}
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// Set sets the fields of a node.
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func (b *backend) Set(name string, node *mesh.Node) error {
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old, err := b.lister.Get(name)
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if err != nil {
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return fmt.Errorf("failed to find node: %v", err)
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}
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n := old.DeepCopy()
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n.ObjectMeta.Annotations[externalIPAnnotationKey] = node.ExternalIP.String()
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n.ObjectMeta.Annotations[internalIPAnnotationKey] = node.InternalIP.String()
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n.ObjectMeta.Annotations[keyAnnotationKey] = string(node.Key)
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oldData, err := json.Marshal(old)
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if err != nil {
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return err
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}
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newData, err := json.Marshal(n)
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if err != nil {
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return err
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}
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patch, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Node{})
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if err != nil {
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return fmt.Errorf("failed to create patch for node %q: %v", n.Name, err)
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}
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if _, err = b.client.CoreV1().Nodes().Patch(name, types.StrategicMergePatchType, patch); err != nil {
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return fmt.Errorf("failed to patch node: %v", err)
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}
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return nil
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}
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// Watch returns a chan of node events.
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func (b *backend) Watch() <-chan *mesh.Event {
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return b.events
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}
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// translateNode translates a Kubernetes Node to a mesh.Node.
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func translateNode(node *v1.Node) *mesh.Node {
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if node == nil {
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return nil
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}
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_, subnet, err := net.ParseCIDR(node.Spec.PodCIDR)
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// The subnet should only ever fail to parse if the pod CIDR has not been set,
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// so in this case set the subnet to nil and let the node be updated.
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if err != nil {
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subnet = nil
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}
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_, leader := node.ObjectMeta.Annotations[leaderAnnotationKey]
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// Allow the region to be overridden by an explicit location.
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location, ok := node.ObjectMeta.Annotations[locationAnnotationKey]
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if !ok {
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location = node.ObjectMeta.Labels[regionLabelKey]
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}
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// Allow the external IP to be overridden.
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externalIP, ok := node.ObjectMeta.Annotations[forceExternalIPAnnotationKey]
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if !ok {
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externalIP = node.ObjectMeta.Annotations[externalIPAnnotationKey]
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}
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return &mesh.Node{
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// ExternalIP and InternalIP should only ever fail to parse if the
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// remote node's mesh has not yet set its IP address;
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// in this case the IP will be nil and
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// the mesh can wait for the node to be updated.
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ExternalIP: normalizeIP(externalIP),
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InternalIP: normalizeIP(node.ObjectMeta.Annotations[internalIPAnnotationKey]),
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Key: []byte(node.ObjectMeta.Annotations[keyAnnotationKey]),
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Leader: leader,
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Location: location,
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Name: node.Name,
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Subnet: subnet,
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}
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}
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func normalizeIP(ip string) *net.IPNet {
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i, ipNet, _ := net.ParseCIDR(ip)
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if ipNet == nil {
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return ipNet
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}
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if ip4 := i.To4(); ip4 != nil {
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ipNet.IP = ip4
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return ipNet
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}
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ipNet.IP = i.To16()
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return ipNet
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}
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