fetcher.ts

import * as graphql from "graphql-request";

// queries
export class Queries {
  // 所有题目列表 Query 语句
  public static questionsQuery: string = `query allQuestions {
  allQuestions {
    ...questionSummaryFields
  }
}

fragment questionSummaryFields on QuestionNode {
  title
  titleSlug
  translatedTitle
  questionId
  questionFrontendId
  topicTags {
      name
      translatedName
  }
  difficulty
  isPaidOnly
}`;

  // 根据名称获取题目详情 Query 语句
  public static questionDataQuery: string =
    `query questionData($titleSlug: String!) {
  question(titleSlug: $titleSlug) {
    questionId
    questionFrontendId
    title
    titleSlug
    content
    translatedTitle
    translatedContent
    isPaidOnly
    difficulty
    likes
    dislikes
    isLiked
    codeSnippets {
      lang
      langSlug
      code
    }
  }
}`;
}

/**
 * fetcher
 * @author yalda
 * @date 2019.08
 */
export class Fetcher<T> {
  private client: graphql.GraphQLClient;

  constructor() {
    this.client = new graphql.GraphQLClient("https://leetcode-cn.com/graphql", {
      headers: {
        accept: "*/*",
        "content-type": "application/json",
        "user-agent":
          "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36",
        "x-newrelic-id": "UAQDVFVRGwEAXVlbBAg=",
      },
    });
  }

  async fetch(query: string): Promise<T> {
    let data: T;
    try {
      data = await this.client.request(query);
    } catch (e) {
      // throw new Error("throw new Error()");
      return Promise.reject("Fetcher#fetch");
    } finally {
      return Promise.resolve(data);
    }
  }
}