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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"log"
"log/slog"
"net/http"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
metalgo "github.com/metal-stack/metal-go"
synclister "github.com/metal-stack/metal-image-cache-sync/cmd/internal/determine-sync-images"
"github.com/metal-stack/metal-image-cache-sync/cmd/internal/metrics"
"github.com/metal-stack/metal-image-cache-sync/cmd/internal/sync"
"github.com/metal-stack/metal-image-cache-sync/pkg/api"
"github.com/metal-stack/metal-image-cache-sync/pkg/utils"
"github.com/metal-stack/v"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/robfig/cron/v3"
"github.com/spf13/afero"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
)
const (
moduleName = "metal-image-cache-sync"
cfgFileType = "yaml"
)
var (
cfgFile string
lister *synclister.SyncLister
syncer *sync.Syncer
logger *slog.Logger
stop context.Context
)
var rootCmd = &cobra.Command{
Use: moduleName,
Short: "a service that sync latest metal-stack images to a partition local image cache",
Version: v.V.String(),
SilenceErrors: true,
SilenceUsage: true,
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
initConfig()
initLogging()
initSignalHandlers()
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
return run()
},
}
func main() {
if err := rootCmd.Execute(); err != nil {
log.Fatal(err)
}
}
func init() {
rootCmd.Flags().String("log-level", "info", "sets the application log level")
rootCmd.Flags().String("image-store", "metal-stack.io", "url to the image store")
rootCmd.Flags().String("image-store-bucket", "images", "bucket of the image store")
rootCmd.Flags().String("metal-api-endpoint", "", "endpoint of the metal-api")
rootCmd.Flags().String("metal-api-hmac", "", "hmac of the metal-api (requires view access)")
rootCmd.Flags().String("schedule", "*/10 * * * *", "cron sync schedule")
rootCmd.Flags().Bool("dry-run", false, "does not download any images, useful for development purposes")
rootCmd.Flags().String("max-cache-size", "10G", "maximum size that the cache should have in the end (can exceed if min amount of images for all image variants is reached)")
rootCmd.Flags().Int("min-images-per-name", 3, "minimum amount of images to keep of an image variant")
rootCmd.Flags().Int("max-images-per-name", -1, "maximum amount of images to cache for an image variant, unlimited if less than zero")
rootCmd.Flags().Uint("expiration-grace-period", 0, "the amount of days to still sync images even if they have already expired in the metal-api (defaults to zero)")
rootCmd.Flags().String("cache-root-path", "/var/lib/metal-image-cache-sync", "root path of where to store the cached entities")
rootCmd.Flags().String("image-cache-bind-address", "0.0.0.0:3000", "image cache http server bind address")
rootCmd.Flags().Bool("enable-kernel-cache", true, "enables caching kernels used for PXE booting inside partitions")
rootCmd.Flags().String("kernel-cache-bind-address", "0.0.0.0:3001", "kernel cache http server bind address")
rootCmd.Flags().Bool("enable-boot-image-cache", true, "enables caching initrd images used for PXE booting inside partitions")
rootCmd.Flags().String("boot-image-cache-bind-address", "0.0.0.0:3002", "kernel cache http server bind address")
rootCmd.Flags().StringSlice("excludes", []string{"/pull_requests/"}, "url paths to exclude from the sync")
err := viper.BindPFlags(rootCmd.Flags())
if err != nil {
log.Fatalf("error setup root cmd: %v", err)
}
}
func initLogging() {
level := slog.LevelInfo
if viper.IsSet("log-level") {
levelVar := slog.LevelVar{}
err := levelVar.UnmarshalText([]byte(viper.GetString("log-level")))
if err != nil {
log.Fatalf("can't initialize logger: %v", err)
}
level = levelVar.Level()
}
jsonHandler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})
logger = slog.New(jsonHandler)
}
func initConfig() {
viper.SetEnvPrefix("METAL_IMAGE_CACHE_SYNC")
viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
viper.AutomaticEnv()
viper.SetConfigType(cfgFileType)
if cfgFile != "" {
viper.SetConfigFile(cfgFile)
if err := viper.ReadInConfig(); err != nil {
log.Fatalf("config file path set explicitly, but unreadable: %v", err)
}
} else {
viper.SetConfigName("config")
viper.AddConfigPath("/etc/" + moduleName)
viper.AddConfigPath("$HOME/." + moduleName)
viper.AddConfigPath(".")
if err := viper.ReadInConfig(); err != nil {
usedCfg := viper.ConfigFileUsed()
if usedCfg != "" {
log.Fatalf("config file %s unreadable: %v", usedCfg, err)
}
}
}
}
func initSignalHandlers() {
stop = signals.SetupSignalHandler()
}
func run() error {
fs := afero.NewOsFs()
c, err := api.NewConfig()
if err != nil {
logger.Error("error reading config", "error", err)
return err
}
err = c.Validate(fs)
if err != nil {
logger.Error("error validating config", "error", err)
return err
}
mc, err := metalgo.NewDriver(c.MetalAPIEndpoint, "", c.MetalAPIHMAC, metalgo.AuthType("Metal-View"))
if err != nil {
logger.Error("cannot create metal-api client", "error", err)
return err
}
imageCollector := metrics.MustImageMetrics(logger.WithGroup("metrics"), c.GetImageRootPath())
kernelCollector := metrics.MustKernelMetrics(logger.WithGroup("metrics"), c.GetKernelRootPath())
bootImageCollector := metrics.MustBootImageMetrics(logger.WithGroup("metrics"), c.GetBootImageRootPath())
dummyRegion := "dummy" // we don't use AWS S3, we don't need a proper region
ss, err := session.NewSession(&aws.Config{
Endpoint: &c.ImageStore,
Region: &dummyRegion,
Credentials: credentials.AnonymousCredentials,
Retryer: client.DefaultRetryer{
NumMaxRetries: 3,
MinRetryDelay: 10 * time.Second,
},
})
if err != nil {
logger.Error("cannot create s3 client", "error", err)
return err
}
s3Client := s3.New(ss)
s3Downloader := s3manager.NewDownloader(ss)
lister = synclister.NewSyncLister(logger.WithGroup("sync-lister"), mc, s3Client, imageCollector, c, stop)
syncer, err = sync.NewSyncer(logger.WithGroup("syncer"), fs, s3Downloader, c, imageCollector, stop)
if err != nil {
logger.Error("cannot create syncer", "error", err)
return err
}
cronjob := cron.New(cron.WithChain(
cron.SkipIfStillRunning(utils.NewCronLogger(logger.WithGroup("cron"))),
))
id, err := cronjob.AddFunc(c.SyncSchedule, func() {
err := runSync(c)
if err != nil {
logger.Error("error during sync", "error", err)
}
for _, e := range cronjob.Entries() {
logger.Info("scheduling next sync", "at", e.Next.String())
}
})
if err != nil {
return fmt.Errorf("could not initialize cron schedule:%w", err)
}
handlers := []cacheFileHandler{newCacheFileHandler(c.ImageCacheBindAddress, c.GetImageRootPath(), imageCollector)}
if c.KernelCacheEnabled {
handlers = append(handlers, newCacheFileHandler(c.KernelCacheBindAddress, c.GetKernelRootPath(), kernelCollector))
}
if c.BootImageCacheEnabled {
handlers = append(handlers, newCacheFileHandler(c.BootImageCacheBindAddress, c.GetBootImageRootPath(), bootImageCollector))
}
logger.Info("start metal stack image sync", "version", v.V.String())
var srvs []*http.Server
for _, h := range handlers {
h := h
router := http.NewServeMux()
router.Handle("/metrics", promhttp.HandlerFor(h.collector.GetGatherer(), promhttp.HandlerOpts{}))
router.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("HEALTHY"))
if err != nil {
logger.Error("health endpoint could not write response body", "error", err)
}
})
router.HandleFunc("/", h.handle)
srv := http.Server{
Addr: h.bindAddress,
Handler: router,
ReadHeaderTimeout: 1 * time.Minute,
}
srvs = append(srvs, &srv)
go func() {
logger.Info("starting to serve files", "bind-address", h.bindAddress, "directory", h.serveDir)
err := srv.ListenAndServe()
if err != nil {
if errors.Is(err, http.ErrServerClosed) {
log.Fatalf("error starting http server, shutting down... %v", err)
}
}
}()
}
err = runSync(c)
if err != nil {
logger.Error("error during initial sync", "error", err)
}
cronjob.Start()
logger.Info("scheduling next sync", "at", cronjob.Entry(id).Next.String())
<-stop.Done()
logger.Info("received stop signal, shutting down...")
cronjob.Stop()
for _, srv := range srvs {
err = srv.Close()
if err != nil {
logger.Error("error shutting down http server", "error", err)
}
}
return nil
}
type cacheFileHandler struct {
serveDir string
serveHandler http.Handler
collector metrics.DownloadCollector
bindAddress string
}
func newCacheFileHandler(bindAddr, serveDir string, collector metrics.DownloadCollector) cacheFileHandler {
return cacheFileHandler{
serveDir: serveDir,
serveHandler: http.FileServer(http.Dir(serveDir)),
collector: collector,
bindAddress: bindAddr,
}
}
func (c *cacheFileHandler) handle(w http.ResponseWriter, r *http.Request) {
logger.Info("serving cache download request", "url", r.URL.String(), "from", r.RemoteAddr)
hw := utils.NewHTTPRedirectResponseWriter(w, r)
c.serveHandler.ServeHTTP(hw, r)
switch code := hw.GetStatus(); code {
case http.StatusTemporaryRedirect:
logger.Info("cache miss", "url", r.URL.String())
c.collector.IncrementCacheMiss()
case http.StatusOK:
c.collector.IncrementDownloads()
case 0:
// occurs when just visting directories through browser, swallow
default:
logger.Info("responded with error code for download", "url", r.URL.String(), "code", code)
}
}
func runSync(c *api.Config) error {
var errs []error
err := func() error {
syncImages, err := lister.DetermineImageSyncList()
if err != nil {
return fmt.Errorf("cannot gather images:%w", err)
}
var converted api.CacheEntities
for _, s := range syncImages {
converted = append(converted, s)
}
err = syncer.Sync(c.GetImageRootPath(), converted)
if err != nil {
return fmt.Errorf("error during image sync:%w", err)
}
return nil
}()
if err != nil {
errs = append(errs, err)
}
err = func() error {
syncKernels, err := lister.DetermineKernelSyncList()
if err != nil {
return fmt.Errorf("cannot kernel images:%w", err)
}
var converted api.CacheEntities
for _, s := range syncKernels {
converted = append(converted, s)
}
err = syncer.Sync(c.GetKernelRootPath(), converted)
if err != nil {
return fmt.Errorf("error during kernel sync:%w", err)
}
return nil
}()
if err != nil {
errs = append(errs, err)
}
err = func() error {
syncImages, err := lister.DetermineBootImageSyncList()
if err != nil {
return fmt.Errorf("cannot gather boot images:%w", err)
}
var converted api.CacheEntities
for _, s := range syncImages {
converted = append(converted, s)
}
err = syncer.Sync(c.GetBootImageRootPath(), converted)
if err != nil {
return fmt.Errorf("error during boot image sync:%w", err)
}
return nil
}()
if err != nil {
errs = append(errs, err)
}
if len(errs) > 0 {
return fmt.Errorf("errors occurred during sync: %v", errs)
}
return nil
}