Add socket event handling foundations and an updateSands event in anticipation of hasty rolls

module/sockets/_index.mjs

@@ -0,0 +1,27 @@
+import { localizer } from "../utils/Localizer.mjs";
+import { Logger } from "../utils/Logger.mjs";
+import { updateSands } from "./updateSands.mjs";
+
+const events = {
+	updateSands,
+};
+
+export function registerSockets() {
+	Logger.info(`Setting up socket listener`);
+
+	game.socket.on(`system.${game.system.id}`, (data, userID) => {
+		const { event, payload } = data ?? {};
+		if (event == null || payload === undefined) {
+			ui.notifications.error(localizer(`RipCrypt.notifs.error.invalid-socket`));
+			return;
+		};
+
+		if (events[event] == null) {
+			ui.notifications.error(localizer(`RipCrypt.notifs.error.unknown-socket-event`, { event }));
+			return;
+		};
+
+		const user = game.users.get(userID);
+		events[event](payload, user);
+	});
+};

module/sockets/updateSands.mjs

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+import { clamp } from "../utils/clamp.mjs";
+import { localizer } from "../utils/Localizer.mjs";
+
+export function updateSands(payload) {
+	if (!game.user.isActiveGM) { return };
+
+	// Assert payload validity
+	const { value, delta } = payload;
+	if (value == null && delta == null) {
+		ui.notifications.error(localizer(
+			`RipCrypt.notifs.error.malformed-socket-payload`,
+			{
+				event: `updateSands`,
+				details: `Either value or delta must be provided`,
+			},
+		));
+		return;
+	};
+
+	// Take action
+	if (value != null) {
+		const initial = game.settings.get(game.system.id, `sandsOfFateInitial`);
+		let sands = clamp(0, value, initial);
+		if (sands === 0) {
+			ui.delveDice.alertCrypticEvent();
+			sands = initial;
+		};
+		game.settings.set(
+			game.system.id,
+			`sandsOfFate`,
+			sands,
+		);
+	} else if (delta != null) {
+		ui.delveDice.sandsOfFateDelta(delta);
+	};
+};