Torjus Håkestad
5cc0e7eadd
Add two complementary features to reduce remote revision cache staleness: 1. Smart local cache: When current system revision matches cached remote revision, force an immediate cache refresh to check for newer revisions. 2. NATS integration: Share cache updates across hosts via NATS pub/sub. Hosts publish revision updates when they fetch new data, and subscribe to receive updates from other hosts. Features include: - Auto-reconnect with infinite retries - Graceful fallback when NATS unavailable - Filtering by flake URL and hostname New CLI flags: --flake.nats.enable --flake.nats.url --flake.nats.subject --flake.nats.credentials-file New NixOS module options under services.prometheus.exporters.nixos.flake.nats Bumps version to 0.3.0. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
package main
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import (
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"context"
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"log/slog"
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"net/http"
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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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"git.t-juice.club/torjus/nixos-exporter/collector"
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"git.t-juice.club/torjus/nixos-exporter/config"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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const version = "0.3.0"
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func main() {
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cfg, err := config.Parse()
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if err != nil {
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slog.Error("Failed to parse config", "error", err)
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os.Exit(1)
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}
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// Register generation collector
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genCollector := collector.NewGenerationCollector()
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prometheus.MustRegister(genCollector)
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slog.Info("Registered generation collector")
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// Register flake collector if enabled
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var flakeCollector *collector.FlakeCollector
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if cfg.FlakeCollector {
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var err error
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flakeCollector, err = collector.NewFlakeCollectorWithNATS(collector.FlakeCollectorConfig{
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FlakeURL: cfg.FlakeURL,
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CheckInterval: cfg.FlakeCheckInterval,
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NATSEnabled: cfg.FlakeNATSEnable,
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NATSURL: cfg.FlakeNATSURL,
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NATSSubject: cfg.FlakeNATSSubject,
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NATSCredentialsFile: cfg.FlakeNATSCredentialsFile,
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})
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if err != nil {
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slog.Error("Failed to create flake collector", "error", err)
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os.Exit(1)
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}
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prometheus.MustRegister(flakeCollector)
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slog.Info("Registered flake collector", "url", cfg.FlakeURL, "check_interval", cfg.FlakeCheckInterval, "nats_enabled", cfg.FlakeNATSEnable)
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}
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.Handler())
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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_, _ = w.Write([]byte(`<html>
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<head><title>NixOS Exporter</title></head>
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<body>
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<h1>NixOS Exporter</h1>
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<p><a href="/metrics">Metrics</a></p>
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</body>
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</html>`))
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})
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server := &http.Server{
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Addr: cfg.ListenAddr,
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Handler: mux,
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ReadTimeout: 10 * time.Second,
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WriteTimeout: 10 * time.Second,
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IdleTimeout: 60 * time.Second,
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}
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// Handle shutdown gracefully
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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defer stop()
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go func() {
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slog.Info("Starting server", "version", version, "addr", cfg.ListenAddr)
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if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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slog.Error("Server error", "error", err)
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os.Exit(1)
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}
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}()
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<-ctx.Done()
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slog.Info("Shutting down server")
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// Close flake collector (NATS connection)
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if flakeCollector != nil {
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if err := flakeCollector.Close(); err != nil {
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slog.Error("Failed to close flake collector", "error", err)
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}
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}
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := server.Shutdown(shutdownCtx); err != nil {
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slog.Error("Failed to shutdown server", "error", err)
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}
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}
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