adding main.go

cmd/go-loose/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"io"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/danyel/go-loose/internal/config"
+	"github.com/danyel/go-loose/internal/database"
+	"github.com/danyel/go-loose/internal/server"
+)
+
+func main() {
+	if len(os.Args) == 2 && os.Args[1] == "-healthcheck" {
+		runHealthcheck()
+		return
+	}
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
+	cfg, err := config.Load()
+	if err != nil {
+		logger.Error("invalid configuration", "error", err)
+		os.Exit(1)
+	}
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+	db, err := database.Open(ctx, cfg.DatabaseURL)
+	if err != nil {
+		logger.Error("database connection failed", "error", err)
+		os.Exit(1)
+	}
+	defer db.Close()
+	if err := database.Migrate(ctx, db); err != nil {
+		logger.Error("database migration failed", "error", err)
+		os.Exit(1)
+	}
+	app, err := server.New(ctx, cfg, db, logger)
+	if err != nil {
+		logger.Error("server initialization failed", "error", err)
+		os.Exit(1)
+	}
+	httpServer := &http.Server{
+		Addr: cfg.Addr, Handler: app.Handler(), ReadHeaderTimeout: 5 * time.Second,
+		ReadTimeout: 15 * time.Second, WriteTimeout: 30 * time.Second, IdleTimeout: 90 * time.Second,
+	}
+	go func() {
+		logger.Info("Go Loose listening", "address", cfg.Addr)
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			logger.Error("HTTP server failed", "error", err)
+			stop()
+		}
+	}()
+	<-ctx.Done()
+	shutdownContext, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := httpServer.Shutdown(shutdownContext); err != nil {
+		logger.Error("graceful shutdown failed", "error", err)
+	}
+}
+
+func runHealthcheck() {
+	client := &http.Client{Timeout: 2 * time.Second}
+	response, err := client.Get("http://127.0.0.1:8080/healthz")
+	if err != nil {
+		os.Exit(1)
+	}
+	defer response.Body.Close()
+	_, _ = io.Copy(io.Discard, response.Body)
+	if response.StatusCode != http.StatusOK {
+		os.Exit(1)
+	}
+}