breakout server/main.go

cmd/server/server.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+
+	"github.com/coder/websocket"
+	"golang.org/x/time/rate"
+)
+
+type S struct {
+	ctx     context.Context
+	limiter *rate.Limiter
+	config  Config
+}
+
+func (s *S) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := s.serveHTTP(w, r); err != nil {
+		log.Println(s.Session(r.Context()), "//", r.URL.Path, "//", err.Error())
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (s *S) serveHTTP(w http.ResponseWriter, r *http.Request) error {
+	if isV1(r) || isWS(r) {
+		return s.serveAPI(w, r)
+	}
+	return s.serveStatic(w, r)
+}
+
+func isV1(r *http.Request) bool {
+	return strings.HasPrefix(r.URL.Path, "/v1/")
+}
+
+func isWS(r *http.Request) bool {
+	return r.URL.Path == "/ws" || strings.HasPrefix(r.URL.Path, "/ws/")
+}
+
+func (s *S) serveStatic(w http.ResponseWriter, r *http.Request) error {
+	return fmt.Errorf("not impl static")
+}
+
+func (s *S) serveAPI(w http.ResponseWriter, r *http.Request) error {
+	if err := s.injectContext(w, r); err == io.EOF {
+		http.Redirect(w, r, "/", http.StatusSeeOther)
+		return nil
+	} else if err != nil {
+		return err
+	}
+
+	if isWS(r) {
+		return s.serveWS(w, r)
+	} else if isV1(r) {
+		return s.serveV1(w, r)
+	}
+
+	http.NotFound(w, r)
+	return nil
+}
+
+type Session struct {
+	ID string
+}
+
+func (s *S) injectContext(w http.ResponseWriter, r *http.Request) error {
+	id, err := r.Cookie("uuid")
+	if err != nil || id.Value == "" {
+		return io.EOF
+	}
+	ctx := r.Context()
+	ctx = context.WithValue(ctx, "session", Session{
+		ID: id.Value,
+	})
+	*r = *r.WithContext(ctx)
+	return nil
+}
+
+func (s *S) Session(ctx context.Context) Session {
+	v, _ := ctx.Value("session").(Session)
+	return v
+}
+
+func (s *S) serveWS(httpw http.ResponseWriter, httpr *http.Request) error {
+	ctx := httpr.Context()
+
+	c, err := websocket.Accept(httpw, httpr, nil)
+	if err != nil {
+		return err
+	}
+	defer c.CloseNow()
+
+	if err := c.Write(ctx, 1, []byte("hello world")); err != nil {
+		return err
+	}
+
+	return fmt.Errorf("not impl")
+}
+
+func (s *S) serveV1(w http.ResponseWriter, r *http.Request) error {
+	return fmt.Errorf("not impl: v1")
+}