Update template

main.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"log/slog"
+	"net/http"
+	"os"
+	"time"
+
+	"git.clustercockpit.org/moebiusband/go-http-skeleton/internal/handlers"
+	"git.clustercockpit.org/moebiusband/go-http-skeleton/internal/middleware"
+)
+
+//go:embed web/static/*
+var static embed.FS
+
+func init() {
+	_, jsonLogger := os.LookupEnv("JSON_LOGGER")
+	_, debug := os.LookupEnv("DEBUG")
+
+	var programLevel slog.Level
+	if debug {
+		programLevel = slog.LevelDebug
+	}
+
+	if jsonLogger {
+		jsonHandler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+			Level: programLevel,
+		})
+		slog.SetDefault(slog.New(jsonHandler))
+	} else {
+		textHandler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+			Level: programLevel,
+		})
+		slog.SetDefault(slog.New(textHandler))
+	}
+
+	slog.Info("Logger initialized", slog.Bool("debug", debug))
+}
+
+func main() {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+	addr := ":" + port
+
+	mux := http.NewServeMux()
+
+	// Use an embedded filesystem rooted at "web/static"
+	fs, err := fs.Sub(static, "web/static")
+	if err != nil {
+		slog.Error("Failed to create sub filesystem", "error", err)
+		return
+	}
+	// Serve files from the embedded /web/static directory at /static
+	fileServer := http.FileServer(http.FS(fs))
+	mux.Handle("GET /static/", http.StripPrefix("/static/", fileServer))
+
+	mux.HandleFunc("GET /favicon.ico", func(w http.ResponseWriter, r *http.Request) {
+		data, err := static.ReadFile("web/static/img/favicon.ico")
+		if err != nil {
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("Content-Type", "text/plain")
+		w.Write(data)
+	})
+	mux.HandleFunc("GET /robots.txt", func(w http.ResponseWriter, r *http.Request) {
+		data, err := static.ReadFile("web/static/robots.txt")
+		if err != nil {
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("Content-Type", "text/plain")
+		w.Write(data)
+	})
+
+	mux.HandleFunc("GET /health", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain")
+		w.Write([]byte(`OK`))
+	})
+
+	mux.HandleFunc("GET /", handlers.RootHandler())
+
+	chain := &middleware.Chain{}
+	chain.Use(middleware.RecoverMiddleware)
+	wrappedMux := chain.Then(mux)
+
+	server := &http.Server{
+		Addr:    fmt.Sprintf(":%s", port),
+		Handler: wrappedMux,
+		// Recommended timeouts from
+		// https://blog.cloudflare.com/exposing-go-on-the-internet/
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 10 * time.Second,
+		IdleTimeout:  120 * time.Second,
+	}
+
+	slog.Info("Server listening", "addr", addr)
+
+	if err := server.ListenAndServe(); err != nil {
+		slog.Error("Server failed to start", "error", err)
+	}
+}