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main.go
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main.go
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// Copyright (c) 2019, Arm Ltd
package main
import (
"flag"
"fmt"
"os"
"regexp"
"syscall"
"io/ioutil"
"github.com/fsnotify/fsnotify"
"github.com/golang/glog"
"gopkg.in/yaml.v2"
pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
)
var confFileName string
type DeviceInstance struct {
devicePlugin *SmarterDevicePlugin
deviceName string
socketName string
deviceFile string
numDevices uint
}
type DesiredDevice struct {
DeviceMatch string
NumMaxDevices uint
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: smarter-device-manager\n")
flag.PrintDefaults()
os.Exit(2)
}
func init() {
flag.Usage = usage
// NOTE: This next line is key you have to call flag.Parse() for the command line
// options or "flags" that are defined in the glog module to be picked up.
flag.StringVar(&confFileName,"config","config/conf.yaml","set the configuration file to use")
flag.Parse()
}
func readDevDirectory() (files []string, err error) {
f, err := os.Open("/dev")
if err != nil {
return nil, err
}
files, err = f.Readdirnames(-1)
f.Close()
if err != nil {
return nil, err
}
return files, nil
}
func findDevicesPattern(listDevices []string, pattern string) ([]string,error) {
var found []string
for _, file := range listDevices {
res,err := regexp.MatchString(pattern, file)
if err != nil {
return nil, err
}
if res {
found = append(found, file)
}
}
return found,nil
}
func main() {
defer glog.Flush()
glog.V(0).Info("Loading smarter-device-manager")
// Setting up the devices to check
var desiredDevices []DesiredDevice
glog.V(0).Info("Reading configuration file ",confFileName)
yamlFile, err := ioutil.ReadFile(confFileName)
if err != nil {
glog.Fatal("yamlFile.Get err #%v ", err)
}
err = yaml.Unmarshal(yamlFile, &desiredDevices)
if err != nil {
glog.Fatal("Unmarshal: %v", err)
os.Exit(-1)
}
glog.V(0).Info("Reading existing devices on /dev")
ExistingDevices, err := readDevDirectory()
if err != nil {
glog.Errorf(err.Error())
os.Exit(1)
}
var listDevicesAvailable []DeviceInstance
for _, deviceToTest := range desiredDevices {
glog.V(0).Infof("Checking devices %s on /dev",deviceToTest.DeviceMatch)
foundDevices,err := findDevicesPattern(ExistingDevices, deviceToTest.DeviceMatch)
if err != nil {
glog.Errorf(err.Error())
os.Exit(1)
}
// If found some create the devices entry
if len(foundDevices) > 0 {
for _, deviceToCreate := range foundDevices {
var newDevice DeviceInstance
newDevice.deviceName = "smarter-devices/" + deviceToCreate
newDevice.socketName = pluginapi.DevicePluginPath + "smarter-" + deviceToCreate + ".sock"
newDevice.deviceFile = "/dev/" + deviceToCreate
newDevice.numDevices = deviceToTest.NumMaxDevices
listDevicesAvailable = append(listDevicesAvailable, newDevice)
glog.V(0).Infof("Creating device %s socket and %s name for %s",newDevice.deviceName,newDevice.deviceFile,deviceToTest.DeviceMatch)
}
}
}
glog.V(0).Info("Starting FS watcher.")
watcher, err := newFSWatcher(pluginapi.DevicePluginPath)
if err != nil {
glog.V(0).Info("Failed to created FS watcher.")
os.Exit(1)
}
defer watcher.Close()
glog.V(0).Info("Starting OS watcher.")
sigs := newOSWatcher(syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
restart := true
L:
for {
if restart {
for _, devicesInUse := range listDevicesAvailable {
if devicesInUse.devicePlugin != nil {
devicesInUse.devicePlugin.Stop()
}
}
var err error
for _, devicesInUse := range listDevicesAvailable {
devicesInUse.devicePlugin = NewSmarterDevicePlugin(devicesInUse.numDevices, devicesInUse.deviceFile, devicesInUse.deviceName, devicesInUse.socketName)
if err = devicesInUse.devicePlugin.Serve(); err != nil {
glog.V(0).Info("Could not contact Kubelet, retrying. Did you enable the device plugin feature gate?")
break
}
}
if err != nil {
continue
}
restart = false
}
select {
case event := <-watcher.Events:
if event.Name == pluginapi.KubeletSocket && event.Op&fsnotify.Create == fsnotify.Create {
glog.V(0).Infof("inotify: %s created, restarting.", pluginapi.KubeletSocket)
restart = true
}
case err := <-watcher.Errors:
glog.V(0).Infof("inotify: %s", err)
case s := <-sigs:
switch s {
case syscall.SIGHUP:
glog.V(0).Info("Received SIGHUP, restarting.")
restart = true
default:
glog.V(0).Infof("Received signal \"%v\", shutting down.", s)
for _, devicesInUse := range listDevicesAvailable {
if devicesInUse.devicePlugin != nil {
devicesInUse.devicePlugin.Stop()
}
}
break L
}
}
}
}