Server authority

server/game/worker.ts

@@ -0,0 +1,57 @@
+/// <reference lib="deno.worker" />
+
+// runs the game in a worker without any permissions, the host does files and networking
+import { GameServer, TICK_MS } from "./game_server.ts";
+import { GameToHost, HostToGame } from "./host_protocol.ts";
+
+const SAVE_INTERVAL_MS = 30_000;
+
+let game: GameServer | undefined;
+
+function post(message: GameToHost) {
+	self.postMessage(message);
+}
+
+self.onmessage = (event: MessageEvent<HostToGame>) => {
+	const message = event.data;
+
+	if (message.type === "init") {
+		game = new GameServer(
+			{
+				send: (conn, data) => post({ type: "send", conn, data }),
+				close: (conn) => post({ type: "close", conn }),
+			},
+			message.save,
+			message.default_seed,
+		);
+
+		setInterval(() => game!.tick(), TICK_MS);
+		setInterval(() => {
+			if (game!.world.dirty) {
+				post({ type: "save", data: game!.save(), final: false });
+			}
+		}, SAVE_INTERVAL_MS);
+
+		post({ type: "ready", seed: game.world.seed });
+		return;
+	}
+
+	if (!game) {
+		return;
+	}
+
+	switch (message.type) {
+		case "connect":
+			game.on_connect(message.conn);
+			break;
+		case "message":
+			game.on_message(message.conn, message.data);
+			break;
+		case "disconnect":
+			game.on_disconnect(message.conn);
+			break;
+		case "shutdown":
+			post({ type: "save", data: game.save(), final: true });
+			break;
+	}
+};