From 1f101fe7cc5cc31c66146a1e226fa4bae805fdd4 Mon Sep 17 00:00:00 2001
From: Leonardo Bishop <me@leonardobishop.com>
Date: Thu, 9 Nov 2023 00:17:03 +0000
Subject: Refactor websockets

---
 backend/src/websocket/coop.ts | 142 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 backend/src/websocket/coop.ts

(limited to 'backend/src/websocket/coop.ts')

diff --git a/backend/src/websocket/coop.ts b/backend/src/websocket/coop.ts
new file mode 100644
index 0000000..ce8bfa0
--- /dev/null
+++ b/backend/src/websocket/coop.ts
@@ -0,0 +1,142 @@
+import {
+  addSessionClient,
+  createNewSession,
+  getSession,
+  setSessionState,
+} from "../config/coop-session-store.js";
+import { WebSocketServer } from "ws";
+import { v4 as uuidv4 } from "uuid";
+import { IncomingMessage } from "http";
+import { CoopWebSocket } from "../model/websocket.js";
+import { parse } from "url";
+import {
+  ClientJoinedCoopSessionMessage,
+  CoopSessionCreatedMessage,
+  CoopSessionMessage,
+  CoopSessionMoveMessage,
+  CoopSessionMoveTimeoutMessage,
+  CoopSessionStateChangeMessage,
+} from "../model/actions/coop.js";
+
+export const wss = new WebSocketServer({ noServer: true });
+
+const sendMessageToClient = (
+  client: CoopWebSocket,
+  message: CoopSessionMessage
+) => {
+  if (client.readyState === client.OPEN) {
+    client.send(JSON.stringify(message));
+    console.log(
+      `Sent message to client ${client.clientId}: ${JSON.stringify(message)}}`
+    );
+  }
+};
+
+wss.on("connection", (ws: CoopWebSocket, req: IncomingMessage) => {
+  ws.clientId = uuidv4();
+
+  const url = parse(req.url!, true);
+
+  if (url.query.action === "create") {
+    const session = createNewSession(ws);
+    sendMessageToClient(ws, <CoopSessionCreatedMessage>{
+      type: "create",
+      payload: {
+        sessionId: session.id,
+      },
+    });
+    ws.sessionId = session.id;
+  } else if (url.query.action === "join") {
+    const session = getSession(url.query.sessionId as string);
+    if (!session) {
+      ws.close();
+      return;
+    }
+
+    addSessionClient(url.query.sessionId as string, ws);
+
+    sendMessageToClient(session.host, <ClientJoinedCoopSessionMessage>{
+      type: "join",
+      payload: {
+        numberOfClients: session.clients.length,
+      },
+    });
+    sendMessageToClient(ws, <CoopSessionStateChangeMessage>{
+      type: "state",
+      payload: {
+        state: session.state,
+      },
+    });
+
+    ws.sessionId = session.id;
+  } else {
+    ws.close();
+    return;
+  }
+
+  ws.on("message", (message) => {
+    console.log(`Received message from client ${ws.clientId}: ${message}`);
+    let data: any;
+    try {
+      data = JSON.parse(message.toString());
+    } catch (e) {
+      return;
+    }
+
+    const session = getSession(ws.sessionId);
+    if (!session) {
+      return;
+    }
+
+    const type = data.type as string;
+    const payload = data.payload as any;
+
+    if (!type || !payload) {
+      return;
+    }
+
+    if (type === "move") {
+      if (Date.now() - ws.nextMoveTimestamp < 0) {
+        return;
+      }
+
+      sendMessageToClient(session.host, <CoopSessionMoveMessage>{
+        type: "move",
+        payload: {
+          move: payload.move,
+        },
+      });
+
+      ws.nextMoveTimestamp = Date.now() + 1000;
+
+      sendMessageToClient(ws, <CoopSessionMoveTimeoutMessage>{
+        type: "timeout",
+        payload: {
+          timeoutUntil: ws.nextMoveTimestamp,
+        },
+      });
+    } else if (type === "start") {
+      session.state = "playing";
+
+      [session.host, ...session.clients].forEach((client) => {
+        sendMessageToClient(client, <CoopSessionStateChangeMessage>{
+          type: "state",
+          payload: {
+            state: "playing",
+          },
+        });
+      });
+    } else if (type === "end") {
+      session.state = "finished";
+
+      [session.host, ...session.clients].forEach((client) => {
+        sendMessageToClient(client, <CoopSessionStateChangeMessage>{
+          type: "state",
+          payload: {
+            state: "finished",
+          },
+        });
+      });
+    }
+  });
+});
-- 
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