add server and websocket comms

1 files changed, 79 insertions, 0 deletions

diff --git a/server/api/game.go b/server/api/game.go
new file mode 100644
index 0000000..bccf12a
--- /dev/null
+++ b/server/api/game.go
@@ -0,0 +1,79 @@
+package api
+
+import (
+	"github.com/gorilla/websocket"
+	"net/http"
+	"sakura/engine"
+	"slices"
+	"uuid"
+)
+
+type Conn struct {
+	Socket *websocket.Conn
+}
+
+var upgrader = websocket.Upgrader{}
+
+var games = make(map[uuid.UUID]*engine.Game)
+var connections = make(map[uuid.UUID][]*Conn)
+
+func GameCreate(w http.ResponseWriter, r *http.Request) {
+	id := uuid.NewV7()
+	games[id] = engine.NewGame()
+	w.Write([]byte(id.String()))
+}
+
+func GameConnect(w http.ResponseWriter, r *http.Request) {
+	id := r.PathValue("id")
+	uid, err := uuid.Parse(id)
+	if err != nil {
+		http.Error(w, "unable to parse game uuid "+err.Error(), http.StatusBadRequest)
+		return
+	}
+	game := games[uid]
+	if game == nil {
+		http.Error(w, "game not found", http.StatusNotFound)
+		return
+	}
+	wsConn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if wsConn == nil {
+		http.Error(w, "unable to initialize websocket", http.StatusInternalServerError)
+		return
+	}
+	conn := &Conn{wsConn}
+	connections[uid] = append(connections[uid], conn)
+	wsConn.SetCloseHandler(func(code int, text string) error {
+		connections[uid] = slices.DeleteFunc(connections[uid], func(potential *Conn) bool {
+			return potential == conn
+		})
+		return nil
+	})
+	err = wsConn.WriteJSON(game)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	go PumpRead(uid, game, wsConn)
+}
+
+func Update(id uuid.UUID, g *engine.Game) {
+	for _, c := range connections[id] {
+		_ = c.Socket.WriteJSON(g)
+	}
+}
+
+func PumpRead(id uuid.UUID, g *engine.Game, conn *websocket.Conn) {
+	var interaction engine.InteractionID
+	for {
+		err := conn.ReadJSON(&interaction)
+		if err != nil {
+			break
+		}
+		g.Actions[interaction].Then(g)
+		Update(id, g)
+	}
+}