insurance-spider/byd.js

import axios from "axios";
import fs from "fs";
import path from "path";
import { timestampToDate, loopCall, keywordsInclude } from "./utils.js";
import config from "./config.js";
import { SQLiteMessageQueue } from "./sqlite.js";

class BYD {
  constructor() {
    this.info = [];
    console.log("比亚迪 爬虫启动...");
    this.queue = new SQLiteMessageQueue();
    this.start();
  }

  async start() {
    try {
      await this.init();
    } catch (err) {
      console.error("启动失败:", err);
    }
  }
  async init() {
    let announcements = this.queue.getAnnouncementsBySpider("比亚迪");
    if (announcements.length > 0) {
      await this.increment();
    } else {
      await this.fullFetch();
    }
  }
  // 全量爬取
  async fullFetch() {
    console.log("开始全量爬取...");
    try {
      await loopCall(this.getInfo.bind(this), {
        time: config.fullFetchTime,
        pagenumber: 1,
        stopWhen: (pagenumber, result) => {
          return (
            pagenumber >= result.pages || pagenumber >= config.pageNumberLimit
          );
        },
        readyForNext: (pagenumber, result) => {
          this.info.push(...result.info);
          return pagenumber + 1;
        },
        complete: (result) => {
          this.info.push(...result.info);
          console.log(`爬取完成，共获取 ${this.info.length} 条有效数据`);
          try {
            if (this.info.length > 0) {
              this.queue.saveAnnouncements("比亚迪", this.info);
              // this.writeFile(this.info);
              this.queue.addMessage("比亚迪", this.info);
            }
          } catch (error) {
            console.error("数据库操作失败:", error);
          }
        },
      });
    } catch (error) {
      console.error("全量爬取失败:", error);
    }
    console.log("开始增量爬取...");
    this.increment();
  }

  // 增量爬取
  async increment() {
    console.log("开始增量爬取模式，每5分钟检查一次新数据...");
    try {
      await loopCall(this.getInfo.bind(this), {
        time: config.incrementFetchTime, // 5分钟间隔
        pagenumber: 1,
        readyForNext: (pagenumber, result) => {
          try {
            let newInfo = this.queue.filterNewAnnouncements(
              "比亚迪",
              result.info
            );
            // 存在新数据
            if (newInfo.length > 0) {
              console.log(`发现 ${newInfo.length} 条新数据`);
              // this.info.push(...newInfo);
              this.queue.saveAnnouncements("比亚迪", newInfo);
              // this.writeFile(this.info);
              this.queue.addMessage("比亚迪", newInfo);
              // 全是新数据，继续下一页
              if (newInfo.length === result.info.length) {
                return pagenumber + 1;
              } else {
                // 有部分重复数据，重新从第一页开始
                return 1;
              }
            } else {
              console.log("没有发现新数据，继续监控...");
              return 1; // 重新从第一页开始
            }
          } catch (error) {
            console.error("数据库操作失败:", error);
          }
        },
      });
    } catch (error) {
      console.error("增量爬取失败:", error);
    }
  }
  async getInfo(pagenumber = 1) {
    let info = [];
    console.log(`正在获取第 ${pagenumber} 页数据...`);
    let result = await this.getList(pagenumber);
    if (result[0]) {
      // 出错, 记录错误日志
      console.error("获取页面数据失败:", result[0]);
      return { pages: 0, info: [] };
    } else {
      let total = result[1].data.total;
      let pages = Math.ceil(total / 10);
      let arr = result[1].data.records;

      for (let i = 0; i < arr.length; i++) {
        let item = arr[i];
        let endTime = timestampToDate(
          new Date(item.signUpEndTime).getTime(),
          true
        );
        // 命中关键词
        if (
          keywordsInclude(item.title) &&
          endTime &&
          +new Date(endTime) >= Date.now()
        ) {
          // console.log("处理项目:", item.sourcingId, item.title);
          info.push({
            id: item.sourcingId,
            name: item.title,
            publishTime: timestampToDate(
              new Date(item.tenderNoticePublishTime).getTime(),
              true
            ),
            endTime: endTime,
            urls: `https://spcn.byd.com/#/tender-detail?sourcingId=${item.sourcingId}`,
          });
        }
      }
      return { pages, info };
    }
  }
  // 分页获取数据
  getList(pagenumber) {
    return axios({
      url: "https://spcn.byd.com/api/srm-sou-sp/supplier/supplier/getTenderAnnouncementInfo",
      data: {
        pageNo: pagenumber,
        pageSize: 10,
      },
      method: "post",
    })
      .then((res) => {
        let result = res.data;
        if (result.msg === "成功" && result.code === "000000") {
          return [null, result];
        } else {
          return ["err", null];
        }
      })
      .catch((err) => {
        return [err, null];
      });
  }
}

new BYD();