云功能中的意外令牌数据库

Question

我正在使用 firebase 云功能，我想在 firebase 数据库中添加产品时发送通知。为此，我正在从 firestore 获取设备令牌。但是，当我运行 firebase deploy 时，我收到以下错误消息：

 error  Parsing error: Unexpected token db

这是 index.js 中的代码

/* eslint-disable */ 
const functions = require("firebase-functions");
const admin = require('firebase-admin');
const db = admin.firestore();

exports.sendToDevice = functions.database
  .ref('products/{productId}')
  .onCreate((snapshot, context) => {
   // const product = snapshot.val();
   
    const querySnapshot = await db
      .collection('users')
      .doc('abcdefgh1235678')
      .collection('tokens')
      .get();

    const tokens = querySnapshot.docs.map(snap => snap.id);
    admin.messaging().sendToDevice(tokens,{ 
        notification: {
            title: 'New Product!',
            body: `New product is  ${context.params.productId}`,
            click_action: 'FLUTTER_NOTIFICATION_CLICK'
          }
    });

    return;
});

更新答案后出现以下错误：

error 解析错误：Unexpected token =>

/* eslint-disable */ 
const functions = require("firebase-functions");
const admin = require('firebase-admin');
admin.initializeApp();  
const db = admin.firestore();

exports.printitemcreated = functions.database.ref('/products/{productId}')
    .onCreate(async(snapshot, context) => {
      const original = snapshot.val();     
      const querySnapshot = await db
            .collection('users')
            .doc('abcdefg123456')
            .collection('tokens')
            .get();
      
          const tokens = querySnapshot.docs.map(snap => snap.id);
          await admin.messaging().sendToDevice(tokens,{ 
              notification: {
                  title: 'New Product!',
                  body: `New product is  ${context.params.productId}`,
                  click_action: 'FLUTTER_NOTIFICATION_CLICK'
                }
          });
      return;
    });

Answer 1

AFAIK db 不是 Cloud Functions 的保留关键字。

问题很可能来自您没有initialize an admin app instance。你应该这样做admin.initializeApp();。

此外，您的 Cloud Function 包含其他（关键）错误：您使用 await 而不将处理程序声明为 async 并且您没有等待对 admin.messaging() 的调用。

以下代码应该可以工作：

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

admin.initializeApp(); // <- See here

const db = admin.firestore();

exports.sendToDevice = functions.database
  .ref('products/{productId}')
  .onCreate(async (snapshot, context) => {    // <- See async here
   // const product = snapshot.val();
   
    const querySnapshot = await db
      .collection('users')
      .doc('abcdefgh1235678')
      .collection('tokens')
      .get();

    const tokens = querySnapshot.docs.map(snap => snap.id);
    await admin.messaging().sendToDevice(tokens,{    // <- See await here
        notification: {
            title: 'New Product!',
            body: `New product is  ${context.params.productId}`,
            click_action: 'FLUTTER_NOTIFICATION_CLICK'
          }
    });

    return null;    // <- See null here
});