package main
import (
"context"
"log/slog"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"code.t-juice.club/torjus/nixos-exporter/collector"
"code.t-juice.club/torjus/nixos-exporter/config"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const version = "0.4.0"
func main() {
cfg, err := config.Parse()
if err != nil {
slog.Error("Failed to parse config", "error", err)
os.Exit(1)
}
// Register generation collector
genCollector := collector.NewGenerationCollector()
prometheus.MustRegister(genCollector)
slog.Info("Registered generation collector")
// Register flake collector if enabled
var flakeCollector *collector.FlakeCollector
if cfg.FlakeCollector {
var err error
flakeCollector, err = collector.NewFlakeCollectorWithNATS(collector.FlakeCollectorConfig{
FlakeURL: cfg.FlakeURL,
CheckInterval: cfg.FlakeCheckInterval,
NATSEnabled: cfg.FlakeNATSEnable,
NATSURL: cfg.FlakeNATSURL,
NATSSubject: cfg.FlakeNATSSubject,
NATSCredentialsFile: cfg.FlakeNATSCredentialsFile,
NATSNkeySeedFile: cfg.FlakeNATSNkeySeedFile,
})
if err != nil {
slog.Error("Failed to create flake collector", "error", err)
os.Exit(1)
}
prometheus.MustRegister(flakeCollector)
slog.Info("Registered flake collector", "url", cfg.FlakeURL, "check_interval", cfg.FlakeCheckInterval, "nats_enabled", cfg.FlakeNATSEnable)
}
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, _ = w.Write([]byte(`
NixOS Exporter
NixOS Exporter
Metrics
`))
})
server := &http.Server{
Addr: cfg.ListenAddr,
Handler: mux,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 60 * time.Second,
}
// Handle shutdown gracefully
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
go func() {
slog.Info("Starting server", "version", version, "addr", cfg.ListenAddr)
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
slog.Error("Server error", "error", err)
os.Exit(1)
}
}()
<-ctx.Done()
slog.Info("Shutting down server")
// Close flake collector (NATS connection)
if flakeCollector != nil {
if err := flakeCollector.Close(); err != nil {
slog.Error("Failed to close flake collector", "error", err)
}
}
shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := server.Shutdown(shutdownCtx); err != nil {
slog.Error("Failed to shutdown server", "error", err)
}
}