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server.go
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server.go
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package main
import (
"fmt"
"log"
"net"
"os"
"path"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
pluginapi "k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1"
)
const (
defaultHealthCheckIntervalSeconds = time.Duration(60)
)
// HostDevicePlugin implements the Kubernetes device plugin API
type HostDevicePluginConfig struct {
ResourceName string `json:"resourceName"`
SocketName string `json:"socketName"`
HostDevices []*HostDevice `json:"hostDevices"`
NumDevices int `json:"numDevices"`
HealthCheckIntervalSeconds time.Duration `json:"healthCheckIntervalSeconds"`
}
type HostDevicePlugin struct {
resourceName string
socket string
healthCheckIntervalSeconds time.Duration
devs []*pluginapi.Device
stop chan interface{}
health chan string
// this device files will be mounted to container
hostDevices []*ExpandedHostDevice
server *grpc.Server
}
var (
_ pluginapi.DevicePluginServer = &HostDevicePlugin{}
)
// NewHostDevicePlugin returns an initialized HostDevicePlugin
func NewHostDevicePlugin(config HostDevicePluginConfig) (*HostDevicePlugin, error) {
expandedHostDevices := []*ExpandedHostDevice{}
for _, hd := range config.HostDevices {
expanded, err := hd.Expand()
if err != nil {
return nil, err
}
expandedHostDevices = append(expandedHostDevices, expanded...)
}
var devs = make([]*pluginapi.Device, config.NumDevices)
health := getHostDevicesHealth(expandedHostDevices)
for i, _ := range devs {
devs[i] = &pluginapi.Device{
ID: fmt.Sprint(i),
Health: health,
}
}
healthCheckIntervalSeconds := defaultHealthCheckIntervalSeconds
if config.HealthCheckIntervalSeconds > 0 {
healthCheckIntervalSeconds = config.HealthCheckIntervalSeconds
}
return &HostDevicePlugin{
resourceName: config.ResourceName,
socket: pluginapi.DevicePluginPath + config.SocketName,
healthCheckIntervalSeconds: healthCheckIntervalSeconds,
devs: devs,
hostDevices: expandedHostDevices,
stop: make(chan interface{}),
health: make(chan string),
}, nil
}
// dial establishes the gRPC communication with the registered device plugin.
func dial(unixSocketPath string, timeout time.Duration) (*grpc.ClientConn, error) {
c, err := grpc.Dial(unixSocketPath, 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 getHostDevicesHealth(hostDevices []*ExpandedHostDevice) string {
health := pluginapi.Healthy
for _, device := range hostDevices {
if _, err := os.Stat(device.HostPath); os.IsNotExist(err) {
health = pluginapi.Unhealthy
log.Printf("HostPath not found: %s", device.HostPath)
}
}
return health
}
// Start starts the gRPC server of the device plugin
func (m *HostDevicePlugin) Start() error {
err := m.cleanup()
if err != nil {
return err
}
sock, err := net.Listen("unix", m.socket)
if err != nil {
return err
}
m.server = grpc.NewServer([]grpc.ServerOption{}...)
pluginapi.RegisterDevicePluginServer(m.server, m)
go m.server.Serve(sock)
// Wait for server to start by launching a blocking connexion
conn, err := dial(m.socket, 5*time.Second)
if err != nil {
return err
}
conn.Close()
go m.healthCheck()
return nil
}
// Stop stops the gRPC server
func (m *HostDevicePlugin) Stop() error {
if m.server == nil {
return nil
}
m.server.Stop()
m.server = nil
close(m.stop)
return m.cleanup()
}
// Register registers the device plugin for the given resourceName with Kubelet.
func (m *HostDevicePlugin) Register(kubeletEndpoint, resourceName string) error {
conn, err := dial(kubeletEndpoint, 5*time.Second)
if err != nil {
return err
}
defer conn.Close()
client := pluginapi.NewRegistrationClient(conn)
reqt := &pluginapi.RegisterRequest{
Version: pluginapi.Version,
Endpoint: path.Base(m.socket),
ResourceName: resourceName,
}
_, err = client.Register(context.Background(), reqt)
if err != nil {
return err
}
return nil
}
// ListAndWatch lists devices and update that list according to the health status
func (m *HostDevicePlugin) ListAndWatch(e *pluginapi.Empty, s pluginapi.DevicePlugin_ListAndWatchServer) error {
fmt.Println("exposing devices: ", m.devs)
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
for {
select {
case <-m.stop:
return nil
case health := <-m.health:
// Update health of devices only in this thread.
for _, dev := range m.devs {
dev.Health = health
}
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
}
}
}
func (m *HostDevicePlugin) healthCheck() {
log.Printf("Starting health check every %d seconds", m.healthCheckIntervalSeconds)
ticker := time.NewTicker(m.healthCheckIntervalSeconds * time.Second)
lastHealth := ""
for {
select {
case <-ticker.C:
health := getHostDevicesHealth(m.hostDevices)
if lastHealth != health {
log.Printf("Health is changed: %s -> %s", lastHealth, health)
m.health <- health
}
lastHealth = health
case <-m.stop:
ticker.Stop()
return
}
}
}
// Allocate which return list of devices.
func (m *HostDevicePlugin) Allocate(ctx context.Context, r *pluginapi.AllocateRequest) (*pluginapi.AllocateResponse, error) {
log.Println("allocate request:", r)
ress := make([]*pluginapi.ContainerAllocateResponse, len(r.GetContainerRequests()))
for i, _ := range r.GetContainerRequests() {
ds := make([]*pluginapi.DeviceSpec, len(m.hostDevices))
for j, _ := range m.hostDevices {
ds[j] = &pluginapi.DeviceSpec{
HostPath: m.hostDevices[j].HostPath,
ContainerPath: m.hostDevices[j].ContainerPath,
Permissions: m.hostDevices[j].Permission,
}
ress[i] = &pluginapi.ContainerAllocateResponse{
Devices: ds,
}
}
}
response := pluginapi.AllocateResponse{
ContainerResponses: ress,
}
log.Println("allocate response: ", response)
return &response, nil
}
func (m *HostDevicePlugin) GetDevicePluginOptions(context.Context, *pluginapi.Empty) (*pluginapi.DevicePluginOptions, error) {
return &pluginapi.DevicePluginOptions{
PreStartRequired: false,
}, nil
}
func (m *HostDevicePlugin) PreStartContainer(context.Context, *pluginapi.PreStartContainerRequest) (*pluginapi.PreStartContainerResponse, error) {
return &pluginapi.PreStartContainerResponse{}, nil
}
func (m *HostDevicePlugin) GetPreferredAllocation(context.Context, *pluginapi.PreferredAllocationRequest) (*pluginapi.PreferredAllocationResponse, error) {
return &pluginapi.PreferredAllocationResponse{}, nil
}
func (m *HostDevicePlugin) cleanup() error {
if err := os.Remove(m.socket); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Serve starts the gRPC server and register the device plugin to Kubelet
func (m *HostDevicePlugin) Serve() error {
err := m.Start()
if err != nil {
log.Printf("Could not start device plugin: %s", err)
return err
}
log.Println("Starting to serve on", m.socket)
err = m.Register(pluginapi.KubeletSocket, m.resourceName)
if err != nil {
log.Printf("Could not register device plugin: %s", err)
m.Stop()
return err
}
log.Println("Registered device plugin with Kubelet")
return nil
}