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server.go
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server.go
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/*************************************************************************
* Copyright (C) [2019] by Cambricon, Inc. All rights reserved
*
* 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
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*************************************************************************/
package main
import (
"fmt"
"github.com/cambricon/cambricon-k8s-device-plugin/pkg/cndev"
"golang.org/x/net/context"
"google.golang.org/grpc"
pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
"log"
"net"
"os"
"path"
"strings"
"time"
)
const (
resourceName = "cambricon.com/mlu"
serverSock = pluginapi.DevicePluginPath + "cambricon.sock"
envDisableHealthChecks = "DP_DISABLE_HEALTHCHECKS"
)
// CambriconDevicePlugin implements the Kubernetes device plugin API
type CambriconDevicePlugin struct {
devs []*pluginapi.Device
socket string
devsMap []*cndev.Device
stop chan interface{}
health chan *pluginapi.Device
server *grpc.Server
}
// NewCambriconDevicePlugin returns an initialized CambriconDevicePlugin
func NewCambriconDevicePlugin() *CambriconDevicePlugin {
devs, devsMap := getDevicesAndMap()
return &CambriconDevicePlugin{
devs: devs,
devsMap: devsMap,
socket: serverSock,
stop: make(chan interface{}),
health: make(chan *pluginapi.Device),
}
}
func (m *CambriconDevicePlugin) GetDevicePluginOptions(context.Context, *pluginapi.Empty) (*pluginapi.DevicePluginOptions, error) {
return &pluginapi.DevicePluginOptions{}, 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
}
// Start starts the gRPC server of the device plugin
func (m *CambriconDevicePlugin) 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 *CambriconDevicePlugin) 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 *CambriconDevicePlugin) 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 *CambriconDevicePlugin) ListAndWatch(e *pluginapi.Empty, s pluginapi.DevicePlugin_ListAndWatchServer) error {
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
for {
select {
case <-m.stop:
return nil
case d := <-m.health:
// FIXME: there is no way to recover from the Unhealthy state.
d.Health = pluginapi.Unhealthy
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
}
}
}
func (m *CambriconDevicePlugin) unhealthy(dev *pluginapi.Device) {
m.health <- dev
}
func (m *CambriconDevicePlugin) PrepareResponse(req *pluginapi.ContainerAllocateRequest) pluginapi.ContainerAllocateResponse {
car := pluginapi.ContainerAllocateResponse{}
//check if card shared device like cnmon has been added into responses
hasMLU100ShareDevice := false
hasMLU270ShareDevice := false
devpaths := m.uuidToPath(req.DevicesIDs)
for _, devpath := range devpaths {
if isMLU270Device(devpath) {
if !hasMLU270ShareDevice {
addDevice(&car, mlu270MonitorDeviceName)
hasMLU270ShareDevice = true
}
var index int
_, err := fmt.Sscanf(devpath, mlu270DeviceName+"%d", &index)
if err != nil {
log.Printf("Failed to get device index for device path %v", err)
} else {
addDevice(&car, fmt.Sprintf(mlu270MSGQDeviceName+":%d", index))
addDevice(&car, fmt.Sprintf(mlu270RPCDeviceName+":%d", index))
addDevice(&car, fmt.Sprintf(mlu270CmsgDeviceName+"%d", index))
addDevice(&car, fmt.Sprintf(mlu270COMMUDeviceName+"%d", index))
}
} else {
if !hasMLU100ShareDevice {
addDevice(&car, mlu100MonitorDeviceName)
_, err := os.Stat(mlu100CodecDeviceName)
if err == nil {
addDevice(&car, mlu100CodecDeviceName)
}
hasMLU100ShareDevice = true
}
}
addDevice(&car, devpath)
}
return car
}
// Allocate which return list of devices.
func (m *CambriconDevicePlugin) Allocate(ctx context.Context, reqs *pluginapi.AllocateRequest) (*pluginapi.AllocateResponse, error) {
devs := m.devs
responses := pluginapi.AllocateResponse{}
for _, req := range reqs.ContainerRequests {
car := m.PrepareResponse(req)
responses.ContainerResponses = append(responses.ContainerResponses, &car)
for _, id := range req.DevicesIDs {
if !deviceExists(devs, id) {
return nil, fmt.Errorf("invalid allocation request: unknown device: %s", id)
}
}
}
return &responses, nil
}
func (m *CambriconDevicePlugin) uuidToPath(uuids []string) []string {
var paths []string
for _, uuid := range uuids {
for _, dev := range m.devsMap {
if dev.UUID == uuid {
paths = append(paths, dev.Path)
}
}
}
return paths
}
func (m *CambriconDevicePlugin) PreStartContainer(context.Context, *pluginapi.PreStartContainerRequest) (*pluginapi.PreStartContainerResponse, error) {
return &pluginapi.PreStartContainerResponse{}, nil
}
func (m *CambriconDevicePlugin) cleanup() error {
if err := os.Remove(m.socket); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (m *CambriconDevicePlugin) healthcheck() {
disableHealthChecks := strings.ToLower(os.Getenv(envDisableHealthChecks))
ctx, cancel := context.WithCancel(context.Background())
var unhealthy chan *pluginapi.Device
if !strings.Contains(disableHealthChecks, "all") {
unhealthy = make(chan *pluginapi.Device)
go watchUnhealthy(ctx, m.devs, m.devsMap, unhealthy)
}
for {
select {
case <-m.stop:
cancel()
return
case dev := <-unhealthy:
m.unhealthy(dev)
}
}
}
// Serve starts the gRPC server and register the device plugin to Kubelet
func (m *CambriconDevicePlugin) 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, 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
}
func addDevice(car *pluginapi.ContainerAllocateResponse, deviceName string) {
dev := new(pluginapi.DeviceSpec)
dev.HostPath = deviceName
dev.ContainerPath = deviceName
dev.Permissions = "rw"
car.Devices = append(car.Devices, dev)
}