WordDatabase 구현

+import { assert } from "console";
+const Database = require("better-sqlite3");
+
+export class WordDatabase {
+  private words: string[] = [];
+  constructor(db_path: string) {
+    const db = new Database("./database.db", {
+      readonly: true,
+    });
+    db.prepare(`SELECT * FROM words`)
+      .all()
+      .forEach((w: any) => {
+        this.words.push(w["word"]);
+      });
+    if (this.words.length < 3) {
+      throw new Error("Not enough words.");
+    }
+  }
+
+  public getWords(count: number): string[] {
+    let words: string[] = [];
+    let temp = this.words.slice();
+    for (let i = 0; i < count; i++) {
+      const idx = Math.floor(Math.random() * temp.length);
+      words.push(temp[idx]);
+      temp.splice(idx, 1);
+    }
+    return words;
+  }
+}

@@ -228,7 +228,7 @@ export class Game {
   }
 
   private pickWords(): string[] {
-    return ["장난감", "백화점", "파티"];
+    return this.room.roomManager.wordDatabase.getWords(3);
   }
 
   private startTimer(timeLeftMillis: number): void {

 {
   "dependencies": {
+    "@types/better-sqlite3": "^5.4.1",
     "@types/express": "^4.17.11",
     "@types/node": "^15.3.1",
     "@types/socket.io": "^3.0.2",
     "@types/socket.io-client": "^3.0.0",
     "@types/uuid": "^8.3.0",
+    "better-sqlite3": "^7.4.1",
     "express": "^4.17.1",
     "nodemon": "^2.0.7",
     "runtypes": "^6.3.0",

 import { RoomDescription } from "../../common/dataType";
+import { WordDatabase } from "../database/WordDatabase";
 import { User } from "../user/User";
 import { Room } from "./Room";
 
 export class RoomManager {
   private rooms: Map<string, Room>;
+  public wordDatabase: WordDatabase;
 
   constructor() {
     this.rooms = new Map<string, Room>();
+    this.wordDatabase = new WordDatabase("./database.db");
   }
 
   public create(name: string, maxConnections: number, admin?: User): Room {

+import { expect } from "chai";
+import { WordDatabase } from "../database/WordDatabase";
+
+describe("단어 데이터베이스", () => {
+  it("랜덤한 단어를 반환합니다", () => {
+    const wordDatabase = new WordDatabase("./database.db");
+    expect(wordDatabase.getWords(3).length).eq(3);
+  });
+});