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server.go
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server.go
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package restic
import (
"context"
"fmt"
"os"
"strings"
"sync"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubeinformers "k8s.io/client-go/informers"
corev1informers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"github.com/heptio/ark/pkg/buildinfo"
"github.com/heptio/ark/pkg/client"
"github.com/heptio/ark/pkg/cmd"
"github.com/heptio/ark/pkg/cmd/util/signals"
"github.com/heptio/ark/pkg/controller"
clientset "github.com/heptio/ark/pkg/generated/clientset/versioned"
informers "github.com/heptio/ark/pkg/generated/informers/externalversions"
"github.com/heptio/ark/pkg/util/logging"
)
func NewServerCommand(f client.Factory) *cobra.Command {
var logLevelFlag = logging.LogLevelFlag(logrus.InfoLevel)
var command = &cobra.Command{
Use: "server",
Short: "Run the ark restic server",
Long: "Run the ark restic server",
Run: func(c *cobra.Command, args []string) {
logLevel := logLevelFlag.Parse()
logrus.Infof("Setting log-level to %s", strings.ToUpper(logLevel.String()))
logger := logging.DefaultLogger(logLevel)
logger.Infof("Starting Ark restic server %s", buildinfo.FormattedGitSHA())
s, err := newResticServer(logger, fmt.Sprintf("%s-%s", c.Parent().Name(), c.Name()))
cmd.CheckError(err)
s.run()
},
}
command.Flags().Var(logLevelFlag, "log-level", fmt.Sprintf("the level at which to log. Valid values are %s.", strings.Join(logLevelFlag.AllowedValues(), ", ")))
return command
}
type resticServer struct {
kubeClient kubernetes.Interface
arkClient clientset.Interface
arkInformerFactory informers.SharedInformerFactory
kubeInformerFactory kubeinformers.SharedInformerFactory
podInformer cache.SharedIndexInformer
logger logrus.FieldLogger
ctx context.Context
cancelFunc context.CancelFunc
}
func newResticServer(logger logrus.FieldLogger, baseName string) (*resticServer, error) {
clientConfig, err := client.Config("", "", baseName)
if err != nil {
return nil, err
}
kubeClient, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
return nil, errors.WithStack(err)
}
arkClient, err := clientset.NewForConfig(clientConfig)
if err != nil {
return nil, errors.WithStack(err)
}
// use a stand-alone pod informer because we want to use a field selector to
// filter to only pods scheduled on this node.
podInformer := corev1informers.NewFilteredPodInformer(
kubeClient,
"",
0,
cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
func(opts *metav1.ListOptions) {
opts.FieldSelector = fmt.Sprintf("spec.nodeName=%s", os.Getenv("NODE_NAME"))
},
)
ctx, cancelFunc := context.WithCancel(context.Background())
return &resticServer{
kubeClient: kubeClient,
arkClient: arkClient,
arkInformerFactory: informers.NewFilteredSharedInformerFactory(arkClient, 0, os.Getenv("HEPTIO_ARK_NAMESPACE"), nil),
kubeInformerFactory: kubeinformers.NewSharedInformerFactory(kubeClient, 0),
podInformer: podInformer,
logger: logger,
ctx: ctx,
cancelFunc: cancelFunc,
}, nil
}
func (s *resticServer) run() {
signals.CancelOnShutdown(s.cancelFunc, s.logger)
s.logger.Info("Starting controllers")
var wg sync.WaitGroup
backupController := controller.NewPodVolumeBackupController(
s.logger,
s.arkInformerFactory.Ark().V1().PodVolumeBackups(),
s.arkClient.ArkV1(),
s.podInformer,
s.kubeInformerFactory.Core().V1().Secrets(),
s.kubeInformerFactory.Core().V1().PersistentVolumeClaims(),
os.Getenv("NODE_NAME"),
)
wg.Add(1)
go func() {
defer wg.Done()
backupController.Run(s.ctx, 1)
}()
restoreController := controller.NewPodVolumeRestoreController(
s.logger,
s.arkInformerFactory.Ark().V1().PodVolumeRestores(),
s.arkClient.ArkV1(),
s.podInformer,
s.kubeInformerFactory.Core().V1().Secrets(),
s.kubeInformerFactory.Core().V1().PersistentVolumeClaims(),
os.Getenv("NODE_NAME"),
)
wg.Add(1)
go func() {
defer wg.Done()
restoreController.Run(s.ctx, 1)
}()
go s.arkInformerFactory.Start(s.ctx.Done())
go s.kubeInformerFactory.Start(s.ctx.Done())
go s.podInformer.Run(s.ctx.Done())
s.logger.Info("Controllers started successfully")
<-s.ctx.Done()
s.logger.Info("Waiting for all controllers to shut down gracefully")
wg.Wait()
}