在 Cloud Functions 中使用 Cloud Firestore 数据

Question

我正在尝试创建从 Cloud Firestore 获取数据的 Cloud Functions，并使用从 Cloud Firestore 获取的值向支付网关 API 发送支付请求。

我可以使用这个函数从 Firestore 中获取我需要的文档：

exports.getData = functions.https.onRequest((req, res) => {
  const docRef = db.collection('requests').doc('vsFyJ5lisBgYNwQEzOLa');
  const getDoc = docRef.get()
    .then(doc => {
      if (!doc.exists) {
        console.log('No such document!');
        return res.send('Not Found')
      } 
        console.log(doc.data());
        return res.send(doc.data());
    })
    .catch(err => {
      console.log('Error getting document', err);
      
    });
    
 });

但是，这个函数只打印文档值；我需要在另一个函数中使用这些值，如下所示：

exports.pay = functions.https.onRequest((req, res) => {
  var Iyzipay = require('iyzipay');
  const doc = db.collection('requests').doc('vsFyJ5lisBgYNwQEzOLa');
  const iyzipay = new Iyzipay({
    apiKey: 'apiKey',
    secretKey: 'secretKey',
      uri: 'https://sandbox-api.iyzipay.com'
  });
  var request = {
    locale: Iyzipay.LOCALE.TR,
    conversationId: '123456789',
    price: doc.price,
    paidPrice: doc.paidPrice,
    currency: Iyzipay.CURRENCY.TRY,
    installment: '1',
    basketId: 'B67832',
    paymentChannel: Iyzipay.PAYMENT_CHANNEL.WEB,
    paymentGroup: Iyzipay.PAYMENT_GROUP.PRODUCT,
    paymentCard: {
        cardHolderName: doc.cardHolderName,
        cardNumber: doc.cardNumber,
        expireMonth: doc.expireMonth,
        expireYear: doc.expireYear,
        cvc: doc.cvc,
        registerCard: '0'
    },
  };
iyzipay.payment.create(request, function (err, result) {
  console.log(err, result);
});
});

我尝试组合如下功能：

exports.pay = functions.https.onRequest((req, res) => {
  var Iyzipay = require('iyzipay');
  const doc = db.collection('requests').doc('vsFyJ5lisBgYNwQEzOLa');
  const iyzipay = new Iyzipay({
    apiKey: 'sandbox-afXhZPW0MQlE4dCUUlHcEopnMBgXnAZI',
    secretKey: 'sandbox-wbwpzKIiplZxI3hh5ALI4FJyAcZKL6kq',
      uri: 'https://sandbox-api.iyzipay.com'
  });
  const docRef = db.collection('requests').doc('vsFyJ5lisBgYNwQEzOLa');
  const getDoc = docRef.get()
    .then(doc => {
      if (!doc.exists) {
        console.log('No such document!');
        return res.send('Not Found')
      } 
        console.log(doc.data());
        return res.send(doc.data());
    })
    .catch(err => {
      console.log('Error getting document', err);
      
    });
  var request = {
    locale: Iyzipay.LOCALE.TR,
    conversationId: '123456789',
    price: '1',
    paidPrice: '1.2',
    currency: Iyzipay.CURRENCY.TRY,
    installment: '1',
    basketId: 'B67832',
    paymentChannel: Iyzipay.PAYMENT_CHANNEL.WEB,
    paymentGroup: Iyzipay.PAYMENT_GROUP.PRODUCT,
    paymentCard: {
        cardHolderName: doc.cardHolderName,
        cardNumber: doc.cardNumber,
        expireMonth: doc.expireMonth,
        expireYear: doc.expireYear,
        cvc: doc.cvc,
        registerCard: '0'
    }        
  };
iyzipay.payment.create(request, function (err, result) {
  console.log(err, result);
});
});

当 Firestore 查询像以前一样打印在控制台上时，支付处理器返回错误。

然后我尝试使用如下静态值调用支付处理器：

var request = {
    locale: Iyzipay.LOCALE.TR,
    conversationId: '123456789',
    price: '1',
    paidPrice: '1.2',
    currency: Iyzipay.CURRENCY.TRY,
    installment: '1',
    basketId: 'B67832',
    paymentChannel: Iyzipay.PAYMENT_CHANNEL.WEB,
    paymentGroup: Iyzipay.PAYMENT_GROUP.LISTING,
    paymentCard: {
        cardHolderName: 'John Doe',
        cardNumber: '5528790000000008',
        expireMonth: '12',
        expireYear: '2030',
        cvc: '123',
        registerCard: '0'
}
}

支付处理器返回成功，所以我获取或使用 Firestore 文档值的方式一定有问题。

为了再次测试它是否确实使用了 Firestore 值，我只将一个字段切换为 cardNumber: doc.cardNumber。控制台返回：

✔  functions[pay]: http function initialized (http://localhost:5000/highmidlow1/us-central1/pay).
i  functions: Beginning execution of "pay"
⚠  External network resource requested!
   - URL: "https://sandbox-api.iyzipay.com/payment/auth"
 - Be careful, this may be a production service.
⚠  Google API requested!
   - URL: "https://oauth2.googleapis.com/token"
   - Be careful, this may be a production service.
>  null {
>    status: 'failure',
>    errorCode: '12',
>    errorMessage: 'Invalid card number',
>    locale: 'tr',
>    systemTime: 1608311421424,
>    conversationId: '123456789'
>  }
>  {
>    expireYear: '2030',
>    paidPrice: 1.2,
>    cardNumber: '5528790000000008',
>    cvc: '123',
>    price: 1,
>    expireMonth: '12',  }

那么如何从 Firestore 中获取文档并在 Cloud Function 中使用其值，例如 price: doc.price？

Answer 1

我认为您需要将您的请求逻辑移动到 .then(...) 块中，因为现在看起来您正试图在实际返回的块之外使用文档结果，这可能就是您为什么收到“无效卡号”错误。

Firestore API 将 Promises 用于大多数/所有 fetch 操作，因此您始终需要等待结果才能使用它。

// ...
docRef.get().then(doc => {
    if (!doc.exists) {
        console.log('No such document!');
        return res.send('Not Found')
    }
    console.log(doc.data());
    res.send(doc.data());

    const request = { ... }
})

如果您使用支持async/await 的节点版本，则可能更容易发现这些类型的错误。

const doc = await docRef.get()
if (!doc.exists) {
    console.log('No such document!');
    return res.send('Not Found')
}
console.log(doc.data());
res.send(doc.data());

const request = { ... }