在 javascript-nodejs 中的 .then() 块内使用 async-await 块时出现问题

Problem:
我使用 ipManager 作为中间件。但由于某种原因，同一个 json 对象被添加到 firestore 两次。此外，许多其他线路也在重复。

Code:

//imports...
exports.ipManager = (req, res, next) => {
  const ip = req.clientIp;
  const fullUrl = req.protocol + "://" + req.get("host") + req.originalUrl;
  console.log(fullUrl)
  if ((ip == "::1") & req.get("host").includes("localhost")) {
    console.log(
      "[+] ipManager functionalities restricted due to server running in local machine"
    );
    console.info(`[+] method=GET path=${fullUrl}`);
    next();
    return;
  }
  const _URL = req.originalUrl
  if (_URL.includes("documentation") || _URL.includes("weather") || _URL=="/") {
    console.log(_URL)
  } else {
    next()
    return
  }

  console.log("IP address " + ip);
  axios
    .get(`http://ip-api.com/json/${ip}`)

    // Show response data
    .then((res) => {
      const info = res.data;
      console.info(JSON.stringify(res.data));
      (async () => {
        try {
          const docRef = await addDoc(collection(db, "req_info_2022.1.22"), {
            country: info.country,
            countryCode: info.countryCode,
            region: info.region,
            regionName: info.regionName,
            city: info.city,
            zip: info.zip,
            lat: info.lat,
            lon: info.lon,
            timezone: info.timezone,
            isp: info.isp,
            org: info.org,
            as: info.as,
            ip: info.query,
            path: fullUrl,
          });
          console.log("Document written with ID: ", docRef.id);
        } catch (e) {
          console.error("Error adding document: ", e);
        }
      })()
    })
    .catch((err) => console.log(err));

  next();
};

This is the console log statements:
Note: Observe that the console.logs are getting repeated two times. Due to this, two documents(which are same) are getting saved in the firebase collection.

Forec HTTPS 中间件

'use strict';
exports.redirectToHTTPS = (req,res,next) => {
  var schema = (req.headers['x-forwarded-proto'] || '').toLowerCase();
  if (req.headers.host.indexOf('localhost')<0 && schema!=='https') {
    res.redirect('https://' + req.headers.host + req.url);
  } else {
    next();
  }
}

您的代码有很多问题，但是使用 async/await 而不是 Promise 链和 IIFE，将使调试变得更容易。

//imports...
exports.ipManager = async (req, res, next) => {
  const ip = req.clientIp;
  const fullUrl = `${req.protocol}://${req.get("host")}${req.originalUrl}`;
  const isLocalMachineCalling =
    (ip == "::1") && req.get("host").includes("localhost");

  if (isLocalMachineCalling) {
    console.log(
      "[+] ipManager functionalities restricted due to server running in local machine"
    );
    console.info(`[+] method=GET path=${fullUrl}`);
    next();
    return;
  }
  if (["documentation", "weather", "/"].includes(req.originalUrl)) {
    console.log(req.originalUrl);
  } else {
    next();
    return;
  }

  console.log("IP address " + ip);
  const results = await axios.get(`http://ip-api.com/json/${ip}`);
  const info = results.data;

  try {
    const docRef = await addDoc(collection(db, "req_info_2022.1.22"), {
      country: info.country,
      countryCode: info.countryCode,
      region: info.region,
      regionName: info.regionName,
      city: info.city,
      zip: info.zip,
      lat: info.lat,
      lon: info.lon,
      timezone: info.timezone,
      isp: info.isp,
      org: info.org,
      as: info.as,
      ip: info.query,
      path: fullUrl,
    });
    console.log("Document written with ID: ", docRef.id);
  } catch (e) {
    console.error("Error adding document: ", e);
  }

  next();
};