feat(story-1.1): implement walking skeleton with Go Chi and Docker Compose

cmd/server/main.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func main() {
+	// Load configuration from environment
+	port := getEnv("PORT", "8080")
+	dbURL := getEnv("DATABASE_URL", "postgres://flowreader:flowreader@db:5432/flowreader?sslmode=disable")
+
+	// Initialize database connection pool
+	ctx := context.Background()
+	pool, err := pgxpool.New(ctx, dbURL)
+	if err != nil {
+		log.Fatalf("Unable to create connection pool: %v", err)
+	}
+	defer pool.Close()
+
+	// Verify database connection
+	if err := pool.Ping(ctx); err != nil {
+		log.Fatalf("Unable to ping database: %v", err)
+	}
+	log.Println("Connected to database")
+
+	// Initialize router
+	r := chi.NewRouter()
+
+	// Middleware
+	r.Use(middleware.Logger)
+	r.Use(middleware.Recoverer)
+	r.Use(middleware.RequestID)
+	r.Use(middleware.RealIP)
+	r.Use(middleware.Timeout(30 * time.Second))
+
+	// Health check endpoint
+	r.Get("/health", func(w http.ResponseWriter, r *http.Request) {
+		// Check database connection
+		if err := pool.Ping(r.Context()); err != nil {
+			http.Error(w, "Database connection failed", http.StatusServiceUnavailable)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{"status":"ok","service":"flowreader"}`))
+	})
+
+	// API routes placeholder
+	r.Route("/api/v1", func(r chi.Router) {
+		r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+			w.Header().Set("Content-Type", "application/json")
+			w.Write([]byte(`{"message":"FlowReader API v1"}`))
+		})
+	})
+
+	// Create server
+	srv := &http.Server{
+		Addr:         ":" + port,
+		Handler:      r,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 15 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	// Graceful shutdown
+	go func() {
+		log.Printf("Server starting on port %s", port)
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("Server failed: %v", err)
+		}
+	}()
+
+	// Wait for interrupt signal
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+	<-quit
+
+	log.Println("Shutting down server...")
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	if err := srv.Shutdown(ctx); err != nil {
+		log.Fatalf("Server forced to shutdown: %v", err)
+	}
+
+	log.Println("Server exited properly")
+}
+
+// getEnv returns the value of an environment variable or a default value
+func getEnv(key, defaultValue string) string {
+	if value, exists := os.LookupEnv(key); exists {
+		return value
+	}
+	return defaultValue
+}