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generic_device.go
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generic_device.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package device_manager
import (
"fmt"
"net"
"os"
"path"
"path/filepath"
"strconv"
"time"
"github.com/fsnotify/fsnotify"
"golang.org/x/net/context"
"google.golang.org/grpc"
"kubevirt.io/kubevirt/pkg/log"
pluginapi "kubevirt.io/kubevirt/pkg/virt-handler/device-manager/deviceplugin/v1beta1"
)
const (
DeviceNamespace = "devices.kubevirt.io"
connectionTimeout = 5 * time.Second
)
type GenericDevice interface {
Start(chan struct{}) error
GetDevicePath() string
GetDeviceName() string
}
type GenericDevicePlugin struct {
counter int
devs []*pluginapi.Device
server *grpc.Server
socketPath string
stop chan struct{}
health chan string
devicePath string
deviceName string
}
func NewGenericDevicePlugin(deviceName string, devicePath string, maxDevices int) *GenericDevicePlugin {
serverSock := fmt.Sprintf(pluginapi.DevicePluginPath+"kubevirt-%s.sock", deviceName)
dpi := &GenericDevicePlugin{
counter: 0,
devs: []*pluginapi.Device{},
socketPath: serverSock,
health: make(chan string),
deviceName: deviceName,
devicePath: devicePath,
}
for i := 0; i < maxDevices; i++ {
dpi.addNewGenericDevice()
}
return dpi
}
func waitForGrpcServer(socketPath string, timeout time.Duration) error {
conn, err := connect(socketPath, timeout)
if err != nil {
return err
}
conn.Close()
return nil
}
// dial establishes the gRPC communication with the registered device plugin.
func connect(socketPath string, timeout time.Duration) (*grpc.ClientConn, error) {
c, err := grpc.Dial(socketPath,
grpc.WithInsecure(),
grpc.WithBlock(),
grpc.WithTimeout(timeout),
grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", addr, timeout)
}),
)
if err != nil {
return nil, err
}
return c, nil
}
func (dpi *GenericDevicePlugin) GetDevicePath() string {
return dpi.devicePath
}
func (dpi *GenericDevicePlugin) GetDeviceName() string {
return dpi.deviceName
}
// Start starts the gRPC server of the device plugin
func (dpi *GenericDevicePlugin) Start(stop chan struct{}) error {
if dpi.server != nil {
return fmt.Errorf("gRPC server already started")
}
logger := log.DefaultLogger()
dpi.stop = stop
err := dpi.cleanup()
if err != nil {
return err
}
sock, err := net.Listen("unix", dpi.socketPath)
if err != nil {
logger.Errorf("[%s] Error creating GRPC server socket: %v", dpi.deviceName, err)
return err
}
dpi.server = grpc.NewServer([]grpc.ServerOption{}...)
pluginapi.RegisterDevicePluginServer(dpi.server, dpi)
err = dpi.Register()
if err != nil {
logger.Errorf("[%s] Error registering with device plugin manager: %v", dpi.deviceName, err)
return err
}
go dpi.server.Serve(sock)
err = waitForGrpcServer(dpi.socketPath, connectionTimeout)
if err != nil {
// this err is returned at the end of the Start function
logger.Errorf("[%s] Error connecting to GRPC server: %v", dpi.deviceName, err)
}
go dpi.healthCheck()
logger.V(3).Infof("[%s] Device plugin server ready", dpi.deviceName)
return err
}
// Stop stops the gRPC server
func (dpi *GenericDevicePlugin) Stop() error {
if dpi.server == nil {
return nil
}
dpi.server.Stop()
dpi.server = nil
return dpi.cleanup()
}
// Register registers the device plugin for the given resourceName with Kubelet.
func (dpi *GenericDevicePlugin) Register() error {
conn, err := connect(pluginapi.KubeletSocket, connectionTimeout)
if err != nil {
return err
}
defer conn.Close()
client := pluginapi.NewRegistrationClient(conn)
reqt := &pluginapi.RegisterRequest{
Version: pluginapi.Version,
Endpoint: path.Base(dpi.socketPath),
ResourceName: fmt.Sprintf("%s/%s", DeviceNamespace, dpi.deviceName),
}
_, err = client.Register(context.Background(), reqt)
if err != nil {
return err
}
return nil
}
func (dpi *GenericDevicePlugin) addNewGenericDevice() {
deviceId := dpi.deviceName + strconv.Itoa(dpi.counter)
dpi.devs = append(dpi.devs, &pluginapi.Device{
ID: deviceId,
Health: pluginapi.Healthy,
})
dpi.counter += 1
}
func (dpi *GenericDevicePlugin) ListAndWatch(e *pluginapi.Empty, s pluginapi.DevicePlugin_ListAndWatchServer) error {
// FIXME: sending an empty list up front should not be needed. This is a workaround for:
// https://github.com/kubevirt/kubevirt/issues/1196
// This can safely be removed once supported upstream Kubernetes is 1.10.3 or higher.
emptyList := []*pluginapi.Device{}
s.Send(&pluginapi.ListAndWatchResponse{Devices: emptyList})
s.Send(&pluginapi.ListAndWatchResponse{Devices: dpi.devs})
for {
select {
case health := <-dpi.health:
// There's only one shared generic device
// so update each plugin device to reflect overall device health
for _, dev := range dpi.devs {
dev.Health = health
}
s.Send(&pluginapi.ListAndWatchResponse{Devices: dpi.devs})
case <-dpi.stop:
return nil
}
}
}
func (dpi *GenericDevicePlugin) Allocate(ctx context.Context, r *pluginapi.AllocateRequest) (*pluginapi.AllocateResponse, error) {
response := pluginapi.AllocateResponse{}
containerResponse := new(pluginapi.ContainerAllocateResponse)
dev := new(pluginapi.DeviceSpec)
dev.HostPath = dpi.devicePath
dev.ContainerPath = dpi.devicePath
dev.Permissions = "rw"
containerResponse.Devices = []*pluginapi.DeviceSpec{dev}
response.ContainerResponses = []*pluginapi.ContainerAllocateResponse{containerResponse}
return &response, nil
}
func (dpi *GenericDevicePlugin) cleanup() error {
if err := os.Remove(dpi.socketPath); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (dpi *GenericDevicePlugin) GetDevicePluginOptions(ctx context.Context, e *pluginapi.Empty) (*pluginapi.DevicePluginOptions, error) {
options := &pluginapi.DevicePluginOptions{
PreStartRequired: false,
}
return options, nil
}
func (dpi *GenericDevicePlugin) PreStartContainer(ctx context.Context, in *pluginapi.PreStartContainerRequest) (*pluginapi.PreStartContainerResponse, error) {
res := &pluginapi.PreStartContainerResponse{}
return res, nil
}
func (dpi *GenericDevicePlugin) healthCheck() error {
logger := log.DefaultLogger()
watcher, err := fsnotify.NewWatcher()
if err != nil {
logger.Errorf("Unable to create fsnotify watcher: %v", err)
return nil
}
defer watcher.Close()
healthy := pluginapi.Healthy
_, err = os.Stat(dpi.devicePath)
if err != nil {
if !os.IsNotExist(err) {
logger.Errorf("Unable to stat device: %v", err)
return err
}
healthy = pluginapi.Unhealthy
}
dirName := filepath.Dir(dpi.devicePath)
err = watcher.Add(dirName)
if err != nil {
logger.Errorf("Unable to add path to fsnotify watcher: %v", err)
return err
}
for {
select {
case <-dpi.stop:
return nil
case event := <-watcher.Events:
logger.Infof("health Event: %v", event)
logger.Infof("health Event Name: %s", event.Name)
if event.Name == dpi.devicePath {
// Health in this case is if the device path actually exists
if event.Op == fsnotify.Create {
healthy = pluginapi.Healthy
} else if (event.Op == fsnotify.Remove) || (event.Op == fsnotify.Rename) {
healthy = pluginapi.Unhealthy
}
dpi.health <- healthy
}
}
}
}