从Firebase Function返回数据到Android [英] Return data to Android from Firebase Function

问题描述

我要做什么:只需从Firebase Cloud Function返回数据即可.

What I am trying to do: Simply return data from Firebase Cloud Function.

此功能用于在付款网关的服务器中创建付款订单.

The function is used to create a payment order in the payment gateway's server.

我需要的有关订单详细信息的数据显示在 function(err，data)中(请参见下文)，但是我需要将此数据发送回我的A​​ndroid应用.

My required data about the order's details are present in the function(err,data) (see below), but I need this data sent back to my Android app.

我遇到的问题:我可以在Firebase控制台的日志中看到打印的数据，但不会返回到我的Android应用.

Problem I faced: I could see the data printed in the Firebase console's log but it doesn't return to my Android app.

我的Firebase云功能:

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

exports.order = functions.https.onCall((amnt, response) => {
  const Ippopay = require('node-ippopay');

  const ippopay_instance = new Ippopay({
    public_key: 'YOUR_PUBLIC_KEY',
    secret_key: 'YOUR_SECRET_KEY',
  });
    
  ippopay_instance.createOrder({
    amount: amnt, 
    currency: 'DOLLAR',
    payment_modes: "cc,dc,nb,cheque",
    customer: {
      name: "Test",
      email: "[e-mail]",
      phone: {
        country_code: "42",
        national_number: "4376543210"
      }
    }
  }, function (err, data) {
    return data.order.order_id;
  });
});

我的Android客户端代码:

public class Payment extends AppCompatActivity implements IppoPayListener {
    Button pay;
    EditText amount;
    private FirebaseFunctions mFunctions;

    TextView order_data;
    String data;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_payment);
    }
    
    @Override
    protected void onPostCreate(@Nullable Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        pay=findViewById(R.id.pay_button);
        amount=findViewById(R.id.user_amount);
        order_data=findViewById(R.id.data_text);
        pay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("PAY Button clicked", "yes");
                mFunctions = FirebaseFunctions.getInstance("us-central1");
               
                mFunctions.getHttpsCallable("order").call(5).continueWith(new Continuation<HttpsCallableResult, Object>() {
                    @Override
                    public Object then(@NonNull Task<HttpsCallableResult> task) throws Exception {
                        HttpsCallableResult result=task.getResult();
                        if(result !=null)
                        {
                            data=result.getData().toString();
                            return result.getData().toString();

                        }
                        return null;
                    }
                });
                order_data.setText(data);
                onPaymentClick();
            }
        });
    }
    
    /* ... */
}

我是一个初学者，因此很可能会出现一些致命的愚蠢错误.:)

I'm a Beginner so there's a high possibility of some dead silly mistakes. :)

推荐答案

根据当前代码的样子，您可以混合使用

Based on what your code looks like at the moment, you have a mix of code from a Callable Cloud Function and the older HTTP Request Cloud Function.

要从可调用的Cloud Function返回数据，您应该返回 Promise ，一种运行异步代码并返回值的方法.较早的JavaScript和许多其他语言改用回调，这就是您在这里使用的.

To return data from a callable Cloud Function, you should return a Promise, a method of running asynchronous code that returns a value. Older JavaScript and many other languages use callbacks instead, which is what you have here.

最简单的一种基于回调的方法:

In it's simplest form, this callback-based method:

someModule.doSomething(input, function (err, result) {
  // check for errors and handle result
});

将通过以下方式转换为使用Promises:

would be converted to use Promises using:

new Promise((resolve, reject) => {
  someModule.doSomething(
    input,
    (err, result) => err ? reject(err) : resolve(result) // short form of "if error, reject with an error, otherwise resolve (succeed) with result"
  )
});

要让客户端正确处理错误，您需要包裹所有错误 functions.https.HttpsError 中的a>a>.

For errors to be handled correctly by clients, you need to wrap any errors in a functions.https.HttpsError.

将其组合在一起可以得到:

Combining this together gives:

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

exports.order = functions.https.onCall((amnt, context) => {
  const Ippopay = require('node-ippopay');
  return new Promise((resolve, reject) => {

    const ippopay_instance = new Ippopay({
      public_key: 'YOUR_PUBLIC_KEY',
      secret_key: 'YOUR_SECRET_KEY',
    });
    
    ippopay_instance.createOrder({
      amount: amnt, 
      currency: 'DOLLAR',
      payment_modes: "cc,dc,nb,cheque",
      customer: {
        name: "Test",
        email: "[e-mail]",
        phone: {
          country_code: "42",
          national_number: "4376543210"
        }
      }
    }, function (err, data) {
      if (err) {
        // something went wrong, send error back to caller
        reject(new functions.https.HttpsError('unknown', 'Ippopay threw an unexpected error', err));
        return;
      }
     
      // successful, send data back to caller
      resolve(data.order.order_id);
    }); 
  });
});

您还应该确保使用 context.auth 来限制对此功能的访问.您不想向错误的客户收费.

You should also make sure you make use of context.auth to restrict access to this function. You wouldn't want to bill the wrong customer.

这篇关于从Firebase Function返回数据到Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！