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172 lines (144 loc) · 4.95 KB
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package main
import (
"archive/zip"
"context"
"io"
"os"
"path/filepath"
"time"
rcon "github.com/katnegermis/pocketmine-rcon"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"github.com/jameslaverack/kubernetes-minecraft-operator/api/v1alpha1"
)
func main() {
log, err := zap.NewProduction()
defer log.Sync()
serverObjectName := os.Getenv("SERVER_OBJECT_NAME")
serverObjectNamespace := os.Getenv("SERVER_OBJECT_NAME")
backupName := os.Getenv("BACKUP_NAME")
rconAddress := os.Getenv("RCON_ADDRESS")
backupSourceDIR := os.Getenv("BACKUP_SOURCE_DIR")
backupDestPath := os.Getenv("BACKUP_DEST_PATH")
log.With(zap.String("server-object-name", serverObjectName),
zap.String("server-object-namespace", serverObjectNamespace),
zap.String("backup-name", backupName),
zap.String("rcon-address", rconAddress),
zap.String("backup-source-dir", backupSourceDIR),
zap.String("backup-dest-path", backupDestPath)).Info("Starting backup")
config, err := rest.InClusterConfig()
if err != nil {
log.With(zap.Error(err)).Panic("Failed to get in-cluster config")
}
log.Info("Acquired in-cluster Kube connection")
v1alpha1.AddToScheme(scheme.Scheme)
crdConfig := *config
crdConfig.ContentConfig.GroupVersion = &schema.GroupVersion{Group: "minecraft.jameslaverack.com", Version: "v1alpha1"}
crdConfig.APIPath = "/apis"
crdConfig.NegotiatedSerializer = serializer.NewCodecFactory(scheme.Scheme)
crdConfig.UserAgent = rest.DefaultKubernetesUserAgent()
restClient, err := rest.UnversionedRESTClientFor(&crdConfig)
if err != nil {
log.With(zap.Error(err)).Panic("Failed to create REST Client")
}
ctx := context.Background()
log.Info("Acquiring lease")
err = acquireLease(ctx, restClient, serverObjectName, serverObjectNamespace, backupName)
if err != nil {
log.With(zap.Error(err)).Panic("Failed to acquire lease")
}
log.Info("Lease acquired")
// TODO make sure to time out after the lease expires!
// TODO Use a real password
conn, err := rcon.NewConnection(rconAddress, "password")
if err != nil {
log.With(zap.Error(err), zap.String("rcon-address", rconAddress)).Panic("Failed to connect to rcon")
}
_, err = conn.SendCommand("save-off")
if err != nil {
log.With(zap.Error(err), zap.String("rcon-address", rconAddress)).Panic("Failed to send save-off")
}
_, err = conn.SendCommand("save-all")
if err != nil {
log.With(zap.Error(err), zap.String("rcon-address", rconAddress)).Panic("Failed to send save-all")
}
file, err := os.Create(filepath.Join(backupDestPath, backupName+".zip"))
if err != nil {
log.With(zap.Error(err), zap.String("backup-dest-path", backupDestPath)).Panic("Failed to create backup destination")
}
defer file.Close()
w := zip.NewWriter(file)
defer w.Close()
walker := func(path string, info os.FileInfo, err error) error {
log.With(zap.String("path", path)).Debug("Crawling path")
if err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
f, err := w.Create(path)
if err != nil {
return err
}
_, err = io.Copy(f, file)
if err != nil {
return err
}
return nil
}
err = filepath.Walk(backupSourceDIR, walker)
if err != nil {
log.With(zap.Error(err), zap.String("backup-dest-path", backupDestPath)).Panic("Failed to create backup")
}
_, err = conn.SendCommand("save-on")
if err != nil {
log.With(zap.Error(err), zap.String("rcon-address", rconAddress)).Panic("Failed to send save-on")
}
// Done!
}
func acquireLease(ctx context.Context, client *rest.RESTClient, serverObjectName, serverObjectNamespace, name string) error {
for {
result := client.Get().Resource("minecraftservers").Name(serverObjectName).Namespace(serverObjectNamespace).Do(ctx)
if result.Error() != nil {
return result.Error()
}
var server v1alpha1.MinecraftServer
err := result.Into(&server)
if err != nil {
return err
}
// Is there a lease already?
const ownerAnnotation = "minecraft/backup-lease-owner"
const expiryAnnotation = "minecraft/backup-lease-expiry"
currentOwner, ok := server.Annotations[ownerAnnotation]
currentLeaseExpiry, err := time.Parse(time.RFC3339, server.Annotations[expiryAnnotation])
if ok && err != nil && currentLeaseExpiry.After(time.Now()) {
// There is already a valid lease
// Is it us?
if currentOwner == name {
// Hey that's us!
return nil
}
// Oh, not us, wait until it expires
time.Sleep(currentLeaseExpiry.Sub(time.Now()))
}
// Okay, the lease is expired or invalid, try to get it.
server.Annotations[ownerAnnotation] = name
server.Annotations[expiryAnnotation] = time.Now().Add(time.Minute * 10).Format(time.RFC3339)
result = client.Put().Resource("minecraftservers").Name(serverObjectName).Namespace(serverObjectNamespace).Body(&server).Do(ctx)
if result.Error() == nil {
// Done!
return nil
}
// Special case, just retry!
}
}