initial project setup

cmd/arcline-email/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log/slog"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"arcline-email/config"
+)
+
+func main() {
+	cfgPath := flag.String("config", "arcline-email.toml", "path to config file")
+	flag.Parse()
+
+	cfg, err := config.Load(*cfgPath)
+	if err != nil {
+		slog.Error("failed to load config", "err", err)
+		os.Exit(1)
+	}
+
+	logger := newLogger(cfg.Logging)
+	slog.SetDefault(logger)
+
+	slog.Info("arcline-email starting", "hostname", cfg.Server.Hostname)
+
+	// TODO: initialize and start servers (SMTP, IMAP)
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	<-ctx.Done()
+	slog.Info("shutdown signal received")
+	stop() // release signal resources before shutdown
+
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// TODO: call server.Shutdown(shutdownCtx) for each listener
+	_ = shutdownCtx
+
+	slog.Info("shutdown complete")
+}
+
+func newLogger(cfg config.LoggingConfig) *slog.Logger {
+	var level slog.Level
+	if err := level.UnmarshalText([]byte(cfg.Level)); err != nil {
+		level = slog.LevelInfo
+	}
+
+	opts := &slog.HandlerOptions{Level: level}
+
+	if cfg.Format == "text" {
+		return slog.New(slog.NewTextHandler(os.Stdout, opts))
+	}
+	return slog.New(slog.NewJSONHandler(os.Stdout, opts))
+}