Phase 0: skeleton, config, chi router, /healthz

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/server/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+
+	"qbank/internal/config"
+)
+
+func main() {
+	cfg := config.Load()
+
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
+	slog.SetDefault(logger)
+
+	r := chi.NewRouter()
+	r.Use(middleware.RequestID)
+	r.Use(requestLogger(logger))
+	r.Use(middleware.Recoverer)
+
+	r.Get("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("OK"))
+	})
+
+	srv := &http.Server{
+		Addr:         ":" + cfg.Port,
+		Handler:      r,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 30 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	go func() {
+		slog.Info("server starting", "port", cfg.Port)
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			slog.Error("server error", "err", err)
+			os.Exit(1)
+		}
+	}()
+
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+	<-quit
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := srv.Shutdown(ctx); err != nil {
+		slog.Error("shutdown error", "err", err)
+	}
+	slog.Info("server stopped")
+}
+
+func requestLogger(logger *slog.Logger) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			start := time.Now()
+			ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
+			next.ServeHTTP(ww, r)
+			logger.Info("request",
+				"method", r.Method,
+				"path", r.URL.Path,
+				"status", ww.Status(),
+				"duration_ms", time.Since(start).Milliseconds(),
+				"request_id", middleware.GetReqID(r.Context()),
+			)
+		})
+	}
+}