First commit, done on M6 from the PLAN.MD

server/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+
+	"countrygame/web"
+)
+
+func main() {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	// Used by the compose healthcheck: the distroless image has no curl.
+	if len(os.Args) > 1 && os.Args[1] == "-healthcheck" {
+		resp, err := http.Get("http://127.0.0.1:" + port + "/healthz")
+		if err != nil || resp.StatusCode != http.StatusOK {
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+
+	root, err := fs.Sub(web.Files, ".")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("ok"))
+	})
+	mux.Handle("/", noCache(http.FileServer(http.FS(root))))
+
+	log.Printf("country game listening on :%s", port)
+	log.Fatal(http.ListenAndServe(":"+port, mux))
+}
+
+// noCache keeps iteration simple: data and scripts are always revalidated.
+func noCache(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Cache-Control", "no-cache")
+		next.ServeHTTP(w, r)
+	})
+}