Question

我正在使用create-react-app样板使用reactjs实现pwa。我需要实现每分钟获取当前位置（lat，lng）的功能当pwa应用在后台运行时，更新Firebase实时数据库中的值。因此，我正在尝试在服务人员中实现该功能。我正在尝试使用SWPrecacheWebpackPlugin导入firebase实例的脚本。配置如下：

new SWPrecacheWebpackPlugin({
  dontCacheBustUrlsMatching: /\.\w{8}\./,
  filename: 'service-worker.js',
  importScripts: [
    '../src/firebase.js'
  ]
 ...
 })

firebase文件初始化firebaseApp.firebase.js文件如下：

import firebase from 'firebase';

var config = {
  apiKey: process.env.REACT_APP_FIREBASE_API_KEY,
  authDomain: process.env.REACT_APP_FIREBASE_AUTH_DOMAIN,
  databaseURL: process.env.REACT_APP_FIREBASE_DB_URL,
  projectId: process.env.REACT_APP_FIREBASE_PROJECT_ID,
  storageBucket: process.env.REACT_APP_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: process.env.REACT_APP_FIREBASE_MESSAGING_SENDER_ID
};

const fire = firebase.initializeApp(config);

export const setPersistence = (type = 'session') => {
  firebase.auth().setPersistence(type);
}

export const googleAuthProvider = new firebase.auth.GoogleAuthProvider();
export const facebookAuthProvider = new firebase.auth.FacebookAuthProvider();
export const twitterAuthProvider = new firebase.auth.TwitterAuthProvider();

export const auth = firebase.auth();
export const db = firebase.database();

export default fire;

我想在服务工作者文件中使用默认对象。服务工作者文件如下。

const isLocalhost = Boolean(
  window.location.hostname === 'localhost' ||
  // [::1] is the IPv6 localhost address.
  window.location.hostname === '[::1]' ||
  // 127.0.0.1/8 is considered localhost for IPv4.
  window.location.hostname.match(
    /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
  )
);

export default function register() {
  if (process.env.NODE_ENV === 'development' && 'serviceWorker' in navigator) {
    const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
    if (publicUrl.origin !== window.location.origin) {
      return;
    }

    window.addEventListener('load', () => {
      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;

      if (isLocalhost) {
        checkValidServiceWorker(swUrl);

        navigator.serviceWorker.ready.then(() => {
          getLocation();
          // invoke firebase instance and make a api call to store in firebase db
        });
      } else {
        // Is not local host. Just register service worker
        registerValidSW(swUrl);
      }
    });
  }
}

function registerValidSW(swUrl) {
  navigator.serviceWorker
    .register(swUrl)
    .then(registration => {
      registration.onupdatefound = () => {
        const installingWorker = registration.installing;
        installingWorker.onstatechange = () => {
          if (installingWorker.state === 'installed') {
            if (navigator.serviceWorker.controller) {
              console.log('New content is available; please refresh.');
              getLocation();
            } else {

              console.log('Content is cached for offline use.');
            }
          }
        };
      };
    })
    .catch(error => {
      console.error('Error during service worker registration:', error);
    });
}

function checkValidServiceWorker(swUrl) {
  // Check if the service worker can be found. If it can't reload the page.
  fetch(swUrl)
    .then(response => {
      // Ensure service worker exists, and that we really are getting a JS file.
      if (
        response.status === 404 ||
        response.headers.get('content-type').indexOf('javascript') === -1
      ) {
        // No service worker found. Probably a different app. Reload the page.
        navigator.serviceWorker.ready.then(registration => {
          registration.unregister().then(() => {
            window.location.reload();
          });
        });
      } else {
        // Service worker found. Proceed as normal.
        registerValidSW(swUrl);
      }
    })
    .catch(() => {
      console.log(
        'No internet connection found. App is running in offline mode.'
      );
    });
}

export function unregister() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.ready.then(registration => {
      registration.unregister();
    });
  }
}

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition);
  } else {
    console.log("Geo Location not supported by browser");
  }
}

function showPosition(position) {
  var location = {
    longitude: position.coords.longitude,
    latitude: position.coords.latitude
  }
  console.log(location)
}

谁能为我指出在Service Worker中导入Firebase实例以及如何在Service Worker中使用firebase.js中导出的函数的正确方向。

在Service Worker中将数据写入Firebase

0 个答案: