Create question services

Author: lsyurea

question-service/src/app.ts

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+import express from 'express';
+
+import * as dotenv from 'dotenv';
+import questionsRouter from './routes/questionsController';
+import userQuestionsRouter from './routes/userQuestionsController';
+
+dotenv.config({ path: '.env.dev' });
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+app.use(express.json());
+
+// different routes
+app.use('/questions', questionsRouter);
+app.use('/userquestions', userQuestionsRouter);
+
+app.listen(PORT, () => {
+    console.log(`Server is running on port ${PORT}`);
+});

question-service/src/db/mongoClient.ts

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+import { MongoClient, ServerApiVersion, Db } from 'mongodb';
+import * as dotenv from 'dotenv';
+// configure env variables
+dotenv.config({ path: '.env.dev' });
+
+const MONGODB_URI = process.env.MONGODB_CONNECTION_STRING || '';
+// console.log(MONGODB_URI);
+
+let db: Db;
+
+const client = new MongoClient(MONGODB_URI, {
+  serverApi: {
+    version: ServerApiVersion.v1,
+    strict: true,
+    deprecationErrors: true,
+
+  }
+});
+
+export async function connectToDB(): Promise<Db> {
+  try {
+    // Connect the client to the server	(optional starting in v4.7)
+    if (!db) {
+      await client.connect();
+      db = client.db('Database1');
+    }
+    return db;
+  } catch (err) {
+    throw new Error(`Error connecting to the database: ${err}`);
+  }
+}

question-service/src/models/types.ts

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+import { UUID } from "crypto";
+
+export interface Questions {
+    _question_id: number;
+    difficulty: number; // 1, 2, 3
+    description: string;
+    examples: string[];
+    constraints: string;
+    tags: string[];
+    title_slug: string;
+    title: string;
+    pictures?: File[];
+}
+
+export interface UserQuestions {
+    _user_id: UUID;
+    _question_id: UUID;
+    status: string; // 'completed', 'in-progress', 'not-started'
+}

question-service/src/routes/questionsController.ts

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+// src/routes/items.ts
+import express, { Request, Response } from 'express';
+import { Collection } from 'mongodb';
+import { connectToDB } from '../db/mongoClient';
+import { Questions } from '../models/types';
+
+const router = express.Router();
+let questionsCollection: Collection<Questions>;
+
+// Middleware to connect to MongoDB and get the collection
+router.use(async (_, res, next) => {
+  try {
+    const db = await connectToDB();
+    questionsCollection = db.collection<Questions>('questions');
+    next();
+  } catch (err) {
+    res.status(500).json({ error: `Failed to connect to MongoDB, ${err}` });
+  }
+});
+
+// GET all items
+router.get('/', async (req: Request, res: Response) => {
+  try {
+    const items = await questionsCollection.find().toArray();
+    res.status(200).json(items);
+  } catch (error) {
+    res.status(500).json({ error: "Failed to fetch items" });
+  }
+});
+
+export default router;

question-service/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES6", // Specify ECMAScript target version
+    "module": "commonjs", // Specify module code generation
+    "outDir": "./dist", // Redirect output structure to the directory
+    "rootDir": "./src", // Specify the root directory of input files
+    "strict": true, // Enable all strict type-checking options
+    "esModuleInterop": true, // Enables emit interoperability between CommonJS and ES Modules
+    "skipLibCheck": true, // Skip type checking of declaration files
+    "forceConsistentCasingInFileNames": true // Disallow inconsistently-cased references
+  },
+  "include": ["src/**/*"], // Include all files in the src directory
+  "exclude": ["node_modules", "**/*.spec.ts"] // Exclude node_modules and test files
+}