/
manager.go
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/
manager.go
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// Copyright 2023 The Cello Authors
//
// 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 deviceplugin
import (
"context"
"net"
"os"
"path"
"time"
"github.com/fsnotify/fsnotify"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
pluginapi "k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1"
"github.com/volcengine/cello/pkg/deviceplugin/mock"
"github.com/volcengine/cello/pkg/utils/logger"
)
var log = logger.GetLogger().WithFields(logger.Fields{"subsys": "deviceplugin"})
// Manager is the interface of device plugin manager.
type Manager interface {
Serve(stopCh chan struct{}) error
Stop()
Update(count int)
}
// PluginManager manages all device plugins.
type PluginManager struct {
plugins []*ENIDevicePlugin
res *resource
cancel context.CancelFunc
ctx context.Context
}
type PluginManagerOption struct {
useExclusiveENI bool
useSharedENI bool
useBranchENI bool
ctx context.Context
eniLister func() int
eniIPLister func() int
branchENILister func() int
dryRun bool
}
// NewPluginManagerWithOptions creates a new PluginManager with given options.
func NewPluginManagerWithOptions(option *PluginManagerOption) *PluginManager {
var ctx context.Context
var cancel context.CancelFunc
if option.ctx == nil {
ctx, cancel = context.WithCancel(context.Background())
} else {
ctx, cancel = context.WithCancel(option.ctx)
}
manager := PluginManager{
plugins: []*ENIDevicePlugin{},
cancel: cancel,
res: &resource{},
}
if option.useExclusiveENI {
manager.res.updateSignal = make(chan struct{})
manager.plugins = append(manager.plugins, NewENIDevicePlugin(Exclusive, manager.res, option.eniLister))
manager.ctx = ctx
}
if option.useSharedENI {
manager.res.updateSignal = make(chan struct{})
manager.plugins = append(manager.plugins, NewENIDevicePlugin(Shared, manager.res, option.eniIPLister))
manager.ctx = ctx
}
if option.useBranchENI {
resNumCh := resource{
updateSignal: make(chan struct{}),
}
manager.plugins = append(manager.plugins, NewENIDevicePlugin(Trunk, &resNumCh, option.branchENILister))
manager.ctx = ctx
}
return &manager
}
// register registers device plugins grpc endpoints to kubelet
// should be called after start().
func (manager *PluginManager) register() error {
conn, err := dailUnix(manager.ctx, KubeletSocket)
if err != nil {
return err
}
defer conn.Close()
client := pluginapi.NewRegistrationClient(conn)
for _, plugin := range manager.plugins {
_, err = client.Register(manager.ctx, &pluginapi.RegisterRequest{
Version: pluginapi.Version,
Endpoint: path.Base(plugin.endPoint),
ResourceName: plugin.name,
})
if err != nil {
return err
}
}
return nil
}
// Serve starts device plugins server and watch kubelet restarts.
func (manager *PluginManager) Serve(stopCh chan struct{}) error {
err := manager.start()
if err != nil {
log.Errorf("Device plugin start failed: %v", err)
return err
}
err = manager.register()
if err != nil {
log.Errorf("Device plugin register failed: %v", err)
return err
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Errorf("Create watcher failed: %v", err)
return err
}
err = watcher.Add(path.Clean(DevicePluginPath))
if err != nil {
log.Errorf("Watch kubelet failed")
return err
}
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Name == KubeletSocket && event.Has(fsnotify.Create) {
log.Infof(" %s created, restarting.", pluginapi.KubeletSocket)
manager.Stop()
manager.ctx, manager.cancel = context.WithCancel(context.Background())
_ = manager.start()
err = manager.register()
if err != nil {
log.Errorf("Register failed after kubelet restart", err)
}
if err != nil {
log.Errorf("register failed after kubelet restart")
}
} else if event.Name == "kubelet.sock" && event.Op&fsnotify.Remove == fsnotify.Remove {
log.Infof("Kubelet stopped")
}
case err := <-watcher.Errors:
if err != nil {
log.Errorf("Watch kubelet failed:v%", err.Error())
}
case <-stopCh:
break
case <-manager.ctx.Done():
break
}
}
}()
return nil
}
// Stop all grpc server and delete endpoints.
func (manager *PluginManager) Stop() {
manager.stop()
_ = manager.cleanUp()
}
// Update will emit count to res channel asynchronously.
func (manager *PluginManager) Update(count int) {
go func() {
t := time.NewTimer(5 * time.Second)
manager.res.count = count
select {
case manager.res.updateSignal <- struct{}{}:
return
case <-t.C:
log.Errorf("Failed to update resource count: %v ", count)
return
}
}()
}
// start will boot grpc service and listen on /var/lib/kubelet/device-plugin/<res>.sock.
func (manager *PluginManager) start() error {
if err := manager.cleanUp(); err != nil {
return err
}
for _, eniPlugin := range manager.plugins {
sock, err := net.Listen("unix", eniPlugin.endPoint)
if err != nil {
return err
}
eniPlugin.server = grpc.NewServer()
eniPlugin.ctx = manager.ctx
pluginapi.RegisterDevicePluginServer(eniPlugin.server, eniPlugin)
go func() {
err := eniPlugin.server.Serve(sock)
if err != nil {
log.Errorf("Failed to serve deviceplugin grpc server.")
}
}()
conn, err := dailUnix(manager.ctx, eniPlugin.endPoint)
if err != nil {
return err
}
err = conn.Close()
if err != nil {
return err
}
log.Infof("Start device plugin for %v", eniPlugin.name)
}
return nil
}
// stop will stop all grpc server and delete endpoints.
func (manager *PluginManager) stop() {
manager.cancel()
for _, eniPlugin := range manager.plugins {
if eniPlugin.server == nil {
return
}
eniPlugin.server.Stop()
eniPlugin.server = nil
}
}
// cleanUp delete all resource.
func (manager *PluginManager) cleanUp() error {
for _, res := range manager.plugins {
if err := os.Remove(res.endPoint); err != nil && !os.IsNotExist(err) {
return err
}
}
return nil
}
func NewPluginManagerOption() *PluginManagerOption {
return &PluginManagerOption{}
}
func (option *PluginManagerOption) WithDryRun() *PluginManagerOption {
option.dryRun = true
return option
}
func (option *PluginManagerOption) UseExclusiveENI() *PluginManagerOption {
option.useExclusiveENI = true
return option
}
func (option *PluginManagerOption) WithENILister(lister func() int) *PluginManagerOption {
option.eniLister = lister
return option
}
func (option *PluginManagerOption) UseSharedENI() *PluginManagerOption {
option.useSharedENI = true
return option
}
func (option *PluginManagerOption) WithIPLister(lister func() int) *PluginManagerOption {
option.eniIPLister = lister
return option
}
func (option *PluginManagerOption) UseBranchENI() *PluginManagerOption {
option.useBranchENI = true
return option
}
func (option *PluginManagerOption) WithBranchENILister(lister func() int) *PluginManagerOption {
option.branchENILister = lister
return option
}
func (option *PluginManagerOption) WithContext(ctx context.Context) *PluginManagerOption {
option.ctx = ctx
return option
}
func (option *PluginManagerOption) BuildManager() Manager {
if option.dryRun {
return mock.New()
}
return NewPluginManagerWithOptions(option)
}
func dailUnix(ctx context.Context, path string) (*grpc.ClientConn, error) {
conn, err := grpc.DialContext(ctx, path,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithBlock(),
grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
return net.DialTimeout("unix", path, time.Second*10)
}),
)
return conn, err
}