init

server.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type Server struct {
+	addr string
+	mux  *http.ServeMux
+}
+
+func NewServer(addr string) *Server {
+	return &Server{
+		addr: addr,
+		mux:  http.NewServeMux(),
+	}
+}
+
+func (s *Server) Handle(pattern string, handler func(w http.ResponseWriter, r *http.Request) error) {
+	s.mux.HandleFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
+		if err := handler(w, r); err != nil {
+			s.Error(w, "something bad happened", err, 500)
+		}
+	})
+}
+
+func (s *Server) JSON(w http.ResponseWriter, data any, status int) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	return json.NewEncoder(w).Encode(data)
+}
+
+func (s *Server) Error(w http.ResponseWriter, msg string, err error, status int) {
+	var e *string
+	if err != nil {
+		e = new(err.Error())
+	}
+
+	s.JSON(w, struct {
+		Message string  `json:"message"`
+		Error   *string `json:"error"`
+	}{
+		Message: msg,
+		Error:   e,
+	}, status)
+}
+
+func (s *Server) ListenAndServe() error {
+	return http.ListenAndServe(s.addr, s.mux)
+}