|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "net/http" |
| 7 | + _ "net/http/pprof" |
| 8 | + "os" |
| 9 | + "os/signal" |
| 10 | + "syscall" |
| 11 | + "time" |
| 12 | + |
| 13 | + "github.com/go-logr/logr" |
| 14 | + "github.com/go-logr/zerologr" |
| 15 | + "github.com/rs/zerolog" |
| 16 | + "github.com/spf13/cobra" |
| 17 | + "k8s.io/client-go/discovery" |
| 18 | + controllerruntime "sigs.k8s.io/controller-runtime" |
| 19 | + |
| 20 | + "github.com/stakater/Reloader/internal/pkg/config" |
| 21 | + "github.com/stakater/Reloader/internal/pkg/controller" |
| 22 | + "github.com/stakater/Reloader/internal/pkg/metadata" |
| 23 | + "github.com/stakater/Reloader/internal/pkg/metrics" |
| 24 | + "github.com/stakater/Reloader/internal/pkg/openshift" |
| 25 | +) |
| 26 | + |
| 27 | +// Environment variable names for pod identity in HA mode. |
| 28 | +const ( |
| 29 | + podNameEnv = "POD_NAME" |
| 30 | + podNamespaceEnv = "POD_NAMESPACE" |
| 31 | +) |
| 32 | + |
| 33 | +// cfg holds the configuration for this reloader instance. |
| 34 | +var cfg *config.Config |
| 35 | + |
| 36 | +func main() { |
| 37 | + if err := newReloaderCommand().Execute(); err != nil { |
| 38 | + os.Exit(1) |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +func newReloaderCommand() *cobra.Command { |
| 43 | + cfg = config.NewDefault() |
| 44 | + |
| 45 | + cmd := &cobra.Command{ |
| 46 | + Use: "reloader", |
| 47 | + Short: "A watcher for your Kubernetes cluster", |
| 48 | + RunE: run, |
| 49 | + } |
| 50 | + |
| 51 | + config.BindFlags(cmd.PersistentFlags(), cfg) |
| 52 | + return cmd |
| 53 | +} |
| 54 | + |
| 55 | +func run(cmd *cobra.Command, args []string) error { |
| 56 | + if err := config.ApplyFlags(cfg); err != nil { |
| 57 | + return fmt.Errorf("applying flags: %w", err) |
| 58 | + } |
| 59 | + |
| 60 | + if err := cfg.Validate(); err != nil { |
| 61 | + return fmt.Errorf("validating config: %w", err) |
| 62 | + } |
| 63 | + |
| 64 | + if cfg.EnableHA { |
| 65 | + if err := validateHAEnvs(); err != nil { |
| 66 | + return err |
| 67 | + } |
| 68 | + cfg.LeaderElection.Identity = os.Getenv(podNameEnv) |
| 69 | + if cfg.LeaderElection.Namespace == "" { |
| 70 | + cfg.LeaderElection.Namespace = os.Getenv(podNamespaceEnv) |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + log, err := configureLogging(cfg.LogFormat, cfg.LogLevel) |
| 75 | + if err != nil { |
| 76 | + return fmt.Errorf("configuring logging: %w", err) |
| 77 | + } |
| 78 | + |
| 79 | + controllerruntime.SetLogger(log) |
| 80 | + |
| 81 | + log.Info("Starting Reloader") |
| 82 | + |
| 83 | + if cfg.WatchedNamespace != "" { |
| 84 | + log.Info("watching single namespace", "namespace", cfg.WatchedNamespace) |
| 85 | + } else { |
| 86 | + log.Info("watching all namespaces") |
| 87 | + } |
| 88 | + |
| 89 | + if len(cfg.NamespaceSelectors) > 0 { |
| 90 | + log.Info("namespace-selector is set", "selectors", cfg.NamespaceSelectorStrings) |
| 91 | + } |
| 92 | + |
| 93 | + if len(cfg.ResourceSelectors) > 0 { |
| 94 | + log.Info("resource-label-selector is set", "selectors", cfg.ResourceSelectorStrings) |
| 95 | + } |
| 96 | + |
| 97 | + if cfg.WebhookURL != "" { |
| 98 | + log.Info("webhook-url is set, will only send webhook, no resources will be reloaded", "url", cfg.WebhookURL) |
| 99 | + } |
| 100 | + |
| 101 | + if cfg.EnableHA { |
| 102 | + log.Info( |
| 103 | + "high-availability mode enabled", |
| 104 | + "leaderElectionID", cfg.LeaderElection.LockName, |
| 105 | + "leaderElectionNamespace", cfg.LeaderElection.Namespace, |
| 106 | + ) |
| 107 | + } |
| 108 | + |
| 109 | + collectors := metrics.SetupPrometheusEndpoint() |
| 110 | + |
| 111 | + if config.ShouldAutoDetectOpenShift() { |
| 112 | + restConfig := controllerruntime.GetConfigOrDie() |
| 113 | + discoveryClient, err := discovery.NewDiscoveryClientForConfig(restConfig) |
| 114 | + if err != nil { |
| 115 | + log.V(1).Info("Failed to create discovery client for DeploymentConfig detection", "error", err) |
| 116 | + } else if openshift.HasDeploymentConfigSupport(discoveryClient, log) { |
| 117 | + cfg.DeploymentConfigEnabled = true |
| 118 | + } |
| 119 | + } |
| 120 | + |
| 121 | + controller.AddOptionalSchemes(cfg.ArgoRolloutsEnabled, cfg.DeploymentConfigEnabled) |
| 122 | + |
| 123 | + mgr, err := controller.NewManager( |
| 124 | + controller.ManagerOptions{ |
| 125 | + Config: cfg, |
| 126 | + Log: log, |
| 127 | + Collectors: &collectors, |
| 128 | + }, |
| 129 | + ) |
| 130 | + if err != nil { |
| 131 | + return fmt.Errorf("creating manager: %w", err) |
| 132 | + } |
| 133 | + |
| 134 | + if err := controller.SetupReconcilers(mgr, cfg, log, &collectors); err != nil { |
| 135 | + return fmt.Errorf("setting up reconcilers: %w", err) |
| 136 | + } |
| 137 | + |
| 138 | + // Skip metadata publisher when ConfigMaps are ignored (no RBAC permissions) |
| 139 | + if !cfg.IsResourceIgnored("configmaps") { |
| 140 | + if err := mgr.Add(metadata.Runnable(mgr.GetClient(), cfg, log)); err != nil { |
| 141 | + log.Error(err, "Failed to add metadata publisher") |
| 142 | + // Non-fatal, continue starting |
| 143 | + } |
| 144 | + } else { |
| 145 | + log.Info("skipping metadata publisher (configmaps ignored)") |
| 146 | + } |
| 147 | + |
| 148 | + if cfg.EnablePProf { |
| 149 | + go startPProfServer(log) |
| 150 | + } |
| 151 | + |
| 152 | + ctx, cancel := context.WithCancel(context.Background()) |
| 153 | + defer cancel() |
| 154 | + |
| 155 | + sigCh := make(chan os.Signal, 1) |
| 156 | + signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM) |
| 157 | + go func() { |
| 158 | + sig := <-sigCh |
| 159 | + log.Info("Received signal, shutting down", "signal", sig) |
| 160 | + cancel() |
| 161 | + }() |
| 162 | + |
| 163 | + log.Info("Starting controller manager") |
| 164 | + if err := controller.RunManager(ctx, mgr, log); err != nil { |
| 165 | + return fmt.Errorf("manager exited with error: %w", err) |
| 166 | + } |
| 167 | + |
| 168 | + log.Info("Reloader shutdown complete") |
| 169 | + return nil |
| 170 | +} |
| 171 | + |
| 172 | +func configureLogging(logFormat, logLevel string) (logr.Logger, error) { |
| 173 | + // Parse log level |
| 174 | + var level zerolog.Level |
| 175 | + switch logLevel { |
| 176 | + case "trace": |
| 177 | + level = zerolog.TraceLevel |
| 178 | + case "debug": |
| 179 | + level = zerolog.DebugLevel |
| 180 | + case "info", "": |
| 181 | + level = zerolog.InfoLevel |
| 182 | + case "warn", "warning": |
| 183 | + level = zerolog.WarnLevel |
| 184 | + case "error": |
| 185 | + level = zerolog.ErrorLevel |
| 186 | + default: |
| 187 | + return logr.Logger{}, fmt.Errorf("unsupported log level: %q", logLevel) |
| 188 | + } |
| 189 | + |
| 190 | + var zl zerolog.Logger |
| 191 | + switch logFormat { |
| 192 | + case "json": |
| 193 | + zl = zerolog.New(os.Stdout).Level(level).With().Timestamp().Logger() |
| 194 | + case "": |
| 195 | + // Human-readable console output |
| 196 | + zl = zerolog.New( |
| 197 | + zerolog.ConsoleWriter{ |
| 198 | + Out: os.Stdout, |
| 199 | + TimeFormat: time.RFC3339, |
| 200 | + }, |
| 201 | + ).Level(level).With().Timestamp().Logger() |
| 202 | + default: |
| 203 | + return logr.Logger{}, fmt.Errorf("unsupported log format: %q", logFormat) |
| 204 | + } |
| 205 | + |
| 206 | + return zerologr.New(&zl), nil |
| 207 | +} |
| 208 | + |
| 209 | +func validateHAEnvs() error { |
| 210 | + podName := os.Getenv(podNameEnv) |
| 211 | + podNamespace := os.Getenv(podNamespaceEnv) |
| 212 | + |
| 213 | + if podName == "" { |
| 214 | + return fmt.Errorf("%s not set, cannot run in HA mode", podNameEnv) |
| 215 | + } |
| 216 | + if podNamespace == "" { |
| 217 | + return fmt.Errorf("%s not set, cannot run in HA mode", podNamespaceEnv) |
| 218 | + } |
| 219 | + return nil |
| 220 | +} |
| 221 | + |
| 222 | +func startPProfServer(log logr.Logger) { |
| 223 | + log.Info("Starting pprof server", "addr", cfg.PProfAddr) |
| 224 | + if err := http.ListenAndServe(cfg.PProfAddr, nil); err != nil { |
| 225 | + log.Error(err, "Failed to start pprof server") |
| 226 | + } |
| 227 | +} |
0 commit comments