外贸邮件模板_官网网站建设方案书_微信广告投放收费标准_国内永久免费云服务器

原仓库代码：/select?titleSlug=selected-question 这个端点函数的调用关系是？
The /select?titleSlug=selected-question endpoint in the alfaarghya/alfa-leetcode-api repository is implemented using a GraphQL query defined in src/GQLQueries/selectProblem.ts. The query fetches detailed information about a specific question based on the titleSlug.

Here is the source code for the implementation.

The code in src/GQLQueries is imported and used in src/GQLQueries/index.ts. You can view the details here.

解释export { default as selectProblemQuery } from ‘./selectProblem’;

This line of code in src/GQLQueries/index.ts re-exports the default export from the ./selectProblem module and names it selectProblemQuery. This allows other modules to import selectProblemQuery directly from src/GQLQueries/index.ts instead of importing from ./selectProblem directly.

export const selectProblem = (req: Request, res: Response) => {const title = req.query.titleSlug as string;if (title !== undefined) {controllers.fetchSingleProblem(res,formatUtils.formatQuestionData,gqlQueries.selectProblemQuery,title);} else {res.status(400).json({error: 'Missing or invalid query parameter: titleSlug',solution: 'put query after select',example: 'localhost:3000/select?titleSlug=two-sum',});}
};

This code defines and exports a function named selectProblem which acts as a route handler for an Express.js application. Here’s what it does:

• It extracts the titleSlug query parameter from the request (req).
• If titleSlug is defined, it calls the fetchSingleProblem function from the controllers module, passing it the response object (res), a format function (formatUtils.formatQuestionData), a GraphQL query (gqlQueries.selectProblemQuery), and the titleSlug.
• If titleSlug is not defined, it responds with a 400 status and a JSON error message indicating the missing or invalid query parameter. The response includes an example of the correct usage.

import { Response } from 'express';
import { DailyProblemData, SelectProblemData } from '../types';const fetchSingleProblem = async (res: Response,formatData: (data: DailyProblemData & SelectProblemData) => void,query: string,titleSlug: string | null
) => {try {const response = await fetch('https://leetcode.com/graphql', {method: 'POST',headers: {'Content-Type': 'application/json',Referer: 'https://leetcode.com',},body: JSON.stringify({query: query,variables: {titleSlug, //search question using titleSlug},}),});const result = await response.json();if (result.errors) {return res.send(result);}return res.json(formatData(result.data));} catch (err) {console.error('Error: ', err);return res.send(err);}
};export default fetchSingleProblem;

This code defines and exports an asynchronous function fetchSingleProblem which performs the following actions:

• Imports Response from express and two types, DailyProblemData and SelectProblemData, from ../types.
• The function fetchSingleProblem takes four parameters: res (Express response object), formatData (a function to format the fetched data), query (a GraphQL query string), and titleSlug (the title slug of the problem).
• It sends a POST request to the LeetCode GraphQL API with the provided query and titleSlug.
• If the request is successful and there are no errors, it formats the data using formatData and sends it in the response.
• If an error occurs, it logs the error and sends the error in the response.

总结

要实现一个独立的 /select?titleSlug=selected-question 端点，下面是一个完整的项目结构、运行和测试步骤。

项目结构

my-leetcode-api/
├── src/
│   ├── GQLQueries/
│   │   ├── selectProblem.ts
│   ├── controllers/
│   │   ├── fetchSingleProblem.ts
│   │   └── problemController.ts
│   ├── routes/
│   │   └── problemRoutes.ts
│   ├── types/
│   │   └── index.ts
│   ├── app.ts
│   └── server.ts
├── package.json
├── tsconfig.json
└── README.md

代码实现

src/GQLQueries/selectProblem.ts

const query = `#graphql
query selectProblem($titleSlug: String!) {question(titleSlug: $titleSlug) {questionIdquestionFrontendIdboundTopicIdtitletitleSlugcontenttranslatedTitletranslatedContentisPaidOnlydifficultylikesdislikesisLikedsimilarQuestionsexampleTestcasescontributors {usernameprofileUrlavatarUrl}topicTags {nameslugtranslatedName}companyTagStatscodeSnippets {langlangSlugcode}statshintssolution {idcanSeeDetailpaidOnlyhasVideoSolutionpaidOnlyVideo}statussampleTestCasemetaDatajudgerAvailablejudgeTypemysqlSchemasenableRunCodeenableTestModeenableDebuggerenvInfolibraryUrladminUrlchallengeQuestion {iddateincompleteChallengeCountstreakCounttype}note}
}`;
export default query;

src/controllers/fetchSingleProblem.ts

import { Response } from 'express';
import { DailyProblemData, SelectProblemData } from '../types';const fetchSingleProblem = async (res: Response,formatData: (data: DailyProblemData & SelectProblemData) => void,query: string,titleSlug: string | null
) => {try {const response = await fetch('https://leetcode.com/graphql', {method: 'POST',headers: {'Content-Type': 'application/json',Referer: 'https://leetcode.com',},body: JSON.stringify({query: query,variables: {titleSlug,},}),});const result = await response.json();if (result.errors) {return res.send(result);}return res.json(formatData(result.data));} catch (err) {console.error('Error: ', err);return res.send(err);}
};export default fetchSingleProblem;

src/controllers/problemController.ts

import { Request, Response } from 'express';
import fetchSingleProblem from './fetchSingleProblem';
import { formatQuestionData } from '../utils/formatUtils';
import selectProblemQuery from '../GQLQueries/selectProblem';export const selectProblem = (req: Request, res: Response) => {const title = req.query.titleSlug as string;if (title !== undefined) {fetchSingleProblem(res,formatQuestionData,selectProblemQuery,title);} else {res.status(400).json({error: 'Missing or invalid query parameter: titleSlug',solution: 'put query after select',example: 'localhost:3000/select?titleSlug=two-sum',});}
};

src/routes/problemRoutes.ts

import express from 'express';
import { selectProblem } from '../controllers/problemController';const router = express.Router();router.get('/select', selectProblem);export default router;

src/types/index.ts

export interface DailyProblemData {// Define your DailyProblemData properties here
}export interface SelectProblemData {// Define your SelectProblemData properties here
}

src/app.ts

import express from 'express';
import problemRoutes from './routes/problemRoutes';const app = express();app.use(express.json());
app.use('/api/problems', problemRoutes);export default app;

src/server.ts

import app from './app';const PORT = process.env.PORT || 3000;app.listen(PORT, () => {console.log(`Server is running on port ${PORT}`);
});

运行项目

1. 初始化项目：

   npm init -y
   npm install express typescript ts-node @types/node @types/express
   

2. 创建 tsconfig.json 文件：

   {"compilerOptions": {"target": "ES6","module": "commonjs","outDir": "./dist","rootDir": "./src","strict": true,"esModuleInterop": true},"include": ["src"],"exclude": ["node_modules"]
   }
   

3. 在 package.json 中添加脚本：

   "scripts": {"start": "ts-node src/server.ts"
   }
   

4. 运行项目：

   npm start
   

测试

1. 使用 Postman 或 cURL 测试端点：

   curl -X GET "http://localhost:3000/api/problems/select?titleSlug=two-sum"
   

2. 确保返回正确的数据格式和内容。

以上便是实现独立的 /select?titleSlug=selected-question 端点的完整项目结构、代码实现、运行步骤和测试方法。