Question

您好，我想向那些将商品添加到购物车并且在7天内没有购买的用户触发通知。

我想自动做。在firebase上实现此功能的正确方法是什么？

Answer 1

const functions = require('firebase-functions');
var admin = require("firebase-admin");
admin.initializeApp();

// timestamp the cart with last item added date/time
exports.timestampCartItem =
  functions.database.ref('/users/{uid}/cart/{item}')
    .onCreate((snapshot, context) => {
      return snapshot.ref.parent('timestamp').set((new Date()).getTime()); // milliseconds
    })



// Call this function every hour using https://cron-job.org/en/
const CART_EXPIRE_TIME = Number(7 * 24 * 60 * 60 * 1000); // days * hours * minutes * seconds * milliseconds
exports.scanZombieCarts = functions.https.onRequest((request, response) => {

  const server_time = Number((new Date()).getTime());
  const usersDBRef = admin.database().ref('users');
  const notifyDBRef = admin.database().ref('notify'); // queue to send notifications with FCM

  return usersDBRef.once('value')
    .then(users => {
      let zombie_promises = [];
      users.forEach(usersnap => {
        let userid = usersnap.key;
        let user = usersnap.val();
        if (user.hasOwnProperty('cart')) {
          let cart_timestamp = Number(user.cart.timestamp || 0) + CART_EXPIRE_TIME;
          if (cart_timestamp < server_time) {
            zombie_promises.push(
              notifyDBRef.push({
                'notification': {
                  'body': `You have ${Object.keys(user.cart).length} items in your Cart.`,
                  'title': 'Sales end soon!'
                },
                'token': user.devicetoken
              })
            );
          }
        }
      })

      return Promise.all(zombie_promises);
    })
    .then(() => {
      let elapsed_time = ((new Date()).getTime() - (server_time)) / 1000;
      response.status(200);
      response.send(`<h2>Finished scan of Zombie Carts...${elapsed_time} seconds</h2>`);
      return null;
    })
    .catch(err => {
      response.status(500);
      response.send(`<h2>Scan failed</h2>`);
      console.log(err);
    })
});

// IMPORTANT:
// https://console.developers.google.com/apis search for and enable FCM
exports.sendReminder =
  functions.database.ref('/notify/{message}')
    .onCreate((snapshot, context) => {
      let message = snapshot.val();

      let send_and_consume = [
        admin.messaging().send(message), // send message to device
        snapshot.ref.remove()            // consumes message from queue
      ]

      return Promise.all(send_and_consume)
        .catch(err => {
          console.log(err); // probably bad token
        })
    })

注释假设用户打开应用程序时，该应用程序会使用从Messages获取的设备令牌编写一个'users / {uid} / devicetoken'键。

请参阅有关启用FCM和CRON触发器的内部注释。

测试将所有这些添加到您的index.js文件中，使用firebase deploy上载到服务器。

在控制台中手动编辑Firebase数据库，以查看触发器自动添加/更新时间戳。

使用firebase serve --only functions从您的计算机本地测试/调试https触发器。它将为您提供一个本地主机链接来运行，并且您可以在控制台中捕获错误。

Answer 2

不幸的是，现在FCM中没有类似的东西，但是您可以使用AlarmManager在自己的服务器或应用程序中实现计划推送，如下所示：在你的清单上

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

在您看来

Calendar sevendayalarm = Calendar.getInstance();

                sevendayalarm.add(Calendar.DATE, 7);

                Intent intent = new Intent(this, AlarmReciever.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 001, intent, 0);

                AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
                am.set(AlarmManager.RTC_WAKEUP, sevendayalarm.getTimeInMillis(), pendingIntent);

您的警报接收者

public  class AlarmReciever extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            // push notification
        }
    }

别忘了在清单中声明收货人

<receiver android:name=".AlarmReceiver" >
         <intent-filter>
           <action android:name="NOTIFICATION_SERVICE" />
         </intent-filter>
     </receiver>

在特定条件下触发触发器通知在Firebase上满足

2 个答案: