add GameCrashManager

.gitignore

@@ -39,3 +39,5 @@ dist/**/*
 
 # ignore yarn.lock
 yarn.lock
+
+crashes

src/GameCrashManager.ts

@@ -0,0 +1,37 @@
+import { MancalaGame } from "mancala.js";
+import fs from "fs";
+const crashFolder = "./crashes";
+export class GameCrashManager {
+  constructor() {}
+
+  static createCrashFolderIfNotExist(): void {
+    if (!fs.existsSync(crashFolder)) {
+      fs.mkdirSync(crashFolder);
+    }
+  }
+
+  static getTime(): string {
+    let date_ob = new Date();
+    let date = ("0" + date_ob.getDate()).slice(-2);
+    let month = ("0" + (date_ob.getMonth() + 1)).slice(-2);
+    let year = date_ob.getFullYear();
+    let hours = date_ob.getHours();
+    let minutes = date_ob.getMinutes();
+    let seconds = date_ob.getSeconds();
+    let miliSeconds = date_ob.getMilliseconds();
+    return `${year}-${month}-${date}-${hours}:${minutes}:${seconds}:${miliSeconds}`;
+  }
+
+  public static logGameCrash(error: Error, game: MancalaGame): string {
+    this.createCrashFolderIfNotExist();
+    const crash = {
+      message: error.message,
+      stack: error.stack,
+      game,
+    };
+    const crashStr = JSON.stringify(crash);
+    const crashFileName = `${game.id}::${this.getTime()}`;
+    fs.writeFile(`${crashFolder}/${crashFileName}`, crashStr, () => {});
+    return crashFileName;
+  }
+}

src/index.ts

@@ -17,6 +17,7 @@ import {
 } from "./channel_names";
 import morgan from "morgan";
 import { GameMove } from "./models/GameMove";
+import { GameCrashManager } from "./GameCrashManager";
 
 const app = express();
 
@@ -77,13 +78,14 @@ rtmt.listenMessage(channel_game_move, (userKey: string, message: Object) => {
       game.moveByPlayerPit(userKey, gameMove.index);
       rtmt.sendMessage(game.player1Id, channel_on_game_update, game);
       rtmt.sendMessage(game.player2Id, channel_on_game_update, game);
-
       if (game.state == "ended") {
         gameStore.delete(game.player1Id);
         gameStore.delete(game.player2Id);
       }
     } catch (err: any) {
       console.error(err);
+      const crashFileName = GameCrashManager.logGameCrash(err, game);
+      console.info(`Game crash saved to file : ${crashFileName}`);
       rtmt.sendMessage(game.player1Id, channel_on_game_crashed, err);
       rtmt.sendMessage(game.player2Id, channel_on_game_crashed, err);
     }