236 lines
9.4 KiB
Go
236 lines
9.4 KiB
Go
package main
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import (
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"context"
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"errors"
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"fmt"
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"log/slog"
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"net"
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"net/http"
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"net/http/pprof"
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"net/url"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/alexflint/go-arg"
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"github.com/go-logr/logr"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/spf13/afero"
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"golang.org/x/sync/errgroup"
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"k8s.io/klog/v2"
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"github.com/spegel-org/spegel/internal/kubernetes"
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"github.com/spegel-org/spegel/pkg/metrics"
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"github.com/spegel-org/spegel/pkg/oci"
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"github.com/spegel-org/spegel/pkg/registry"
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"github.com/spegel-org/spegel/pkg/routing"
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"github.com/spegel-org/spegel/pkg/state"
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)
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type ConfigurationCmd struct {
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ContainerdRegistryConfigPath string `arg:"--containerd-registry-config-path,env:CONTAINERD_REGISTRY_CONFIG_PATH" default:"/etc/containerd/certs.d" help:"Directory where mirror configuration is written."`
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Registries []url.URL `arg:"--registries,required,env:REGISTRIES" help:"registries that are configured to be mirrored."`
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MirrorRegistries []url.URL `arg:"--mirror-registries,env:MIRROR_REGISTRIES,required" help:"registries that are configured to act as mirrors."`
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ResolveTags bool `arg:"--resolve-tags,env:RESOLVE_TAGS" default:"true" help:"When true Spegel will resolve tags to digests."`
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PrependExisting bool `arg:"--prepend-existing,env:PREPEND_EXISTING" default:"false" help:"When true existing mirror configuration will be kept and Spegel will prepend it's configuration."`
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}
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type BootstrapConfig struct {
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BootstrapKind string `arg:"--bootstrap-kind,env:BOOTSTRAP_KIND" help:"Kind of bootsrapper to use."`
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KubeconfigPath string `arg:"--kubeconfig-path,env:KUBECONFIG_PATH" help:"Path to the kubeconfig file."`
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LeaderElectionName string `arg:"--leader-election-name,env:LEADER_ELECTION_NAME" default:"spegel-leader-election" help:"Name of leader election."`
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LeaderElectionNamespace string `arg:"--leader-election-namespace,env:LEADER_ELECTION_NAMESPACE" default:"spegel" help:"Kubernetes namespace to write leader election data."`
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DNSBootstrapDomain string `arg:"--dns-bootstrap-domain,env:DNS_BOOTSTRAP_DOMAIN" help:"Domain to use when bootstrapping using DNS."`
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HTTPBootstrapAddr string `arg:"--http-bootstrap-addr,env:HTTP_BOOTSTRAP_ADDR" help:"Address to serve for HTTP bootstrap."`
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HTTPBootstrapPeer string `arg:"--http-bootstrap-peer,env:HTTP_BOOTSTRAP_PEER" help:"Peer to HTTP bootstrap with."`
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}
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type RegistryCmd struct {
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BootstrapConfig
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ContainerdRegistryConfigPath string `arg:"--containerd-registry-config-path,env:CONTAINERD_REGISTRY_CONFIG_PATH" default:"/etc/containerd/certs.d" help:"Directory where mirror configuration is written."`
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MetricsAddr string `arg:"--metrics-addr,required,env:METRICS_ADDR" help:"address to serve metrics."`
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LocalAddr string `arg:"--local-addr,required,env:LOCAL_ADDR" help:"Address that the local Spegel instance will be reached at."`
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ContainerdSock string `arg:"--containerd-sock,env:CONTAINERD_SOCK" default:"/run/containerd/containerd.sock" help:"Endpoint of containerd service."`
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ContainerdNamespace string `arg:"--containerd-namespace,env:CONTAINERD_NAMESPACE" default:"k8s.io" help:"Containerd namespace to fetch images from."`
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ContainerdContentPath string `arg:"--containerd-content-path,env:CONTAINERD_CONTENT_PATH" default:"/var/lib/containerd/io.containerd.content.v1.content" help:"Path to Containerd content store"`
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RouterAddr string `arg:"--router-addr,env:ROUTER_ADDR,required" help:"address to serve router."`
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RegistryAddr string `arg:"--registry-addr,env:REGISTRY_ADDR,required" help:"address to server image registry."`
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Registries []url.URL `arg:"--registries,env:REGISTRIES,required" help:"registries that are configured to be mirrored."`
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MirrorResolveTimeout time.Duration `arg:"--mirror-resolve-timeout,env:MIRROR_RESOLVE_TIMEOUT" default:"20ms" help:"Max duration spent finding a mirror."`
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MirrorResolveRetries int `arg:"--mirror-resolve-retries,env:MIRROR_RESOLVE_RETRIES" default:"3" help:"Max amount of mirrors to attempt."`
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ResolveLatestTag bool `arg:"--resolve-latest-tag,env:RESOLVE_LATEST_TAG" default:"true" help:"When true latest tags will be resolved to digests."`
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}
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type Arguments struct {
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Configuration *ConfigurationCmd `arg:"subcommand:configuration"`
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Registry *RegistryCmd `arg:"subcommand:registry"`
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LogLevel slog.Level `arg:"--log-level,env:LOG_LEVEL" default:"INFO" help:"Minimum log level to output. Value should be DEBUG, INFO, WARN, or ERROR."`
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}
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func main() {
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args := &Arguments{}
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arg.MustParse(args)
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opts := slog.HandlerOptions{
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AddSource: true,
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Level: args.LogLevel,
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}
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handler := slog.NewJSONHandler(os.Stderr, &opts)
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log := logr.FromSlogHandler(handler)
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klog.SetLogger(log)
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ctx := logr.NewContext(context.Background(), log)
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err := run(ctx, args)
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if err != nil {
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log.Error(err, "run exit with error")
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os.Exit(1)
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}
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log.Info("gracefully shutdown")
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}
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func run(ctx context.Context, args *Arguments) error {
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ctx, cancel := signal.NotifyContext(ctx, syscall.SIGTERM)
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defer cancel()
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switch {
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case args.Configuration != nil:
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return configurationCommand(ctx, args.Configuration)
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case args.Registry != nil:
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return registryCommand(ctx, args.Registry)
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default:
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return errors.New("unknown subcommand")
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}
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}
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func configurationCommand(ctx context.Context, args *ConfigurationCmd) error {
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fs := afero.NewOsFs()
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err := oci.AddMirrorConfiguration(ctx, fs, args.ContainerdRegistryConfigPath, args.Registries, args.MirrorRegistries, args.ResolveTags, args.PrependExisting)
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if err != nil {
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return err
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}
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return nil
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}
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func registryCommand(ctx context.Context, args *RegistryCmd) (err error) {
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log := logr.FromContextOrDiscard(ctx)
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g, ctx := errgroup.WithContext(ctx)
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// OCI Client
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ociClient, err := oci.NewContainerd(args.ContainerdSock, args.ContainerdNamespace, args.ContainerdRegistryConfigPath, args.Registries, oci.WithContentPath(args.ContainerdContentPath))
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if err != nil {
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return err
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}
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err = ociClient.Verify(ctx)
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if err != nil {
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return err
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}
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// Metrics
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metrics.Register()
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.HandlerFor(metrics.DefaultGatherer, promhttp.HandlerOpts{}))
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mux.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
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mux.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
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mux.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
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mux.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
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mux.Handle("/debug/pprof/heap", pprof.Handler("heap"))
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mux.Handle("/debug/pprof/allocs", pprof.Handler("allocs"))
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mux.Handle("/debug/pprof/goroutine", pprof.Handler("goroutine"))
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mux.Handle("/debug/pprof/threadcreate", pprof.Handler("threadcreate"))
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mux.Handle("/debug/pprof/block", pprof.Handler("block"))
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mux.Handle("/debug/pprof/mutex", pprof.Handler("mutex"))
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metricsSrv := &http.Server{
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Addr: args.MetricsAddr,
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Handler: mux,
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}
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g.Go(func() error {
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if err := metricsSrv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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return err
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}
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return nil
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})
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g.Go(func() error {
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<-ctx.Done()
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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return metricsSrv.Shutdown(shutdownCtx)
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})
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// Router
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_, registryPort, err := net.SplitHostPort(args.RegistryAddr)
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if err != nil {
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return err
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}
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bootstrapper, err := getBootstrapper(args.BootstrapConfig)
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if err != nil {
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return err
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}
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router, err := routing.NewP2PRouter(ctx, args.RouterAddr, bootstrapper, registryPort)
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if err != nil {
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return err
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}
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g.Go(func() error {
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return router.Run(ctx)
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})
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// State tracking
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g.Go(func() error {
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err := state.Track(ctx, ociClient, router, args.ResolveLatestTag)
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if err != nil {
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return err
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}
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return nil
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})
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// Registry
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registryOpts := []registry.Option{
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registry.WithResolveLatestTag(args.ResolveLatestTag),
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registry.WithResolveRetries(args.MirrorResolveRetries),
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registry.WithResolveTimeout(args.MirrorResolveTimeout),
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registry.WithLocalAddress(args.LocalAddr),
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registry.WithLogger(log),
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}
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reg := registry.NewRegistry(ociClient, router, registryOpts...)
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regSrv, err := reg.Server(args.RegistryAddr)
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if err != nil {
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return err
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}
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g.Go(func() error {
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if err := regSrv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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return err
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}
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return nil
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})
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g.Go(func() error {
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<-ctx.Done()
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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return regSrv.Shutdown(shutdownCtx)
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})
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log.Info("running Spegel", "registry", args.RegistryAddr, "router", args.RouterAddr)
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err = g.Wait()
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if err != nil {
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return err
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}
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return nil
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}
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func getBootstrapper(cfg BootstrapConfig) (routing.Bootstrapper, error) { //nolint: ireturn // Return type can be different structs.
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switch cfg.BootstrapKind {
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case "kubernetes":
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cs, err := kubernetes.GetClientset(cfg.KubeconfigPath)
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if err != nil {
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return nil, err
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}
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return routing.NewKubernetesBootstrapper(cs, cfg.LeaderElectionNamespace, cfg.LeaderElectionName), nil
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case "dns":
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return routing.NewDNSBootstrapper(cfg.DNSBootstrapDomain, 10), nil
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case "http":
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return routing.NewHTTPBootstrapper(cfg.HTTPBootstrapAddr, cfg.HTTPBootstrapPeer), nil
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default:
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return nil, fmt.Errorf("unknown bootstrap kind %s", cfg.BootstrapKind)
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}
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}
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