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server.go
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server.go
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package main
import (
"log"
"net"
"os"
"path"
"strings"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
"github.com/google/uuid"
pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
)
const (
resourceName = "takmatsu/fake"
serverSock = pluginapi.DevicePluginPath + "fake.sock"
)
type FakeDevicePlugin struct {
devs []*pluginapi.Device
socket string
stop chan interface{}
health chan *pluginapi.Device
server *grpc.Server
}
func NewFakeDevicePlugin() *FakeDevicePlugin {
return &FakeDevicePlugin {
devs: getDevices(),
socket: serverSock,
}
}
func (m *FakeDevicePlugin) GetDevicePluginOptions(context.Context, *pluginapi.Empty) (*pluginapi.DevicePluginOptions, error) {
return &pluginapi.DevicePluginOptions{}, nil
}
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 getDevices() []*pluginapi.Device {
var devs []*pluginapi.Device
for i := uint(0); i < 8; i++ {
u, _ := uuid.NewRandom()
devs = append(devs, &pluginapi.Device{
ID: u.String(),
Health: pluginapi.Healthy,
})
}
return devs
}
func (m *FakeDevicePlugin) 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()
return nil
}
func (m *FakeDevicePlugin) Stop() error {
if m.server == nil {
return nil
}
m.server.Stop()
m.server = nil
close(m.stop)
return m.cleanup()
}
func (m *FakeDevicePlugin) 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
}
func (m *FakeDevicePlugin) 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 *FakeDevicePlugin) Allocate(ctx context.Context, reqs *pluginapi.AllocateRequest) (*pluginapi.AllocateResponse, error) {
responses := pluginapi.AllocateResponse{}
for _, req := range reqs.ContainerRequests {
response := pluginapi.ContainerAllocateResponse{
Envs: map[string]string{
"FAKE_DEVICES": strings.Join(req.DevicesIDs, ","),
},
}
responses.ContainerResponses = append(responses.ContainerResponses, &response)
}
return &responses, nil
}
func (m *FakeDevicePlugin) PreStartContainer(context.Context, *pluginapi.PreStartContainerRequest) (*pluginapi.PreStartContainerResponse, error) {
return &pluginapi.PreStartContainerResponse{}, nil
}
func (m *FakeDevicePlugin) cleanup() error {
if err := os.Remove(m.socket); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (m *FakeDevicePlugin) 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
}