javascript - Firebase 函数。https.onCall 返回 null

Question

我有以下用 node.js 编写的 firebase 云函数，我从 Android 应用程序调用该函数。该函数工作正常，但在尝试在 Android 中获取结果时得到 null。我需要返回到我的 Android 应用程序 console.log(result.data); 行，但该行在 firebase 函数完全完成后调用，因此我的 Android 应用程序为 null。

index.js

'use strict'

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const subcheck = require('./subcheck');
admin.initializeApp();


exports.subcheck = functions.https.onCall((data, context) => {
    subcheck.verifySubscription(data, context);
});

这是我的 subcheck.js

'use strict'
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const key =  require('./service-account-key.json'); // JSON key file
const {google} = require('googleapis');

const authClient = new google.auth.JWT({
    email: key.client_email,
    key: key.private_key,
    scopes: ["https://www.googleapis.com/auth/androidpublisher"]
});

const playDeveloperApiClient = google.androidpublisher({
    version: 'v3',
    auth: authClient
});

//admin.initializeApp(functions.config().firebase);

exports.verifySubscription = function(data, context) {
    const skuId = data.sku_id;
    const purchaseToken = data.purchase_token;
    const packageName = data.package_name;

    return authClient.authorize()
        .then(function(result) {
            return playDeveloperApiClient.purchases.subscriptions.get({
                packageName: packageName,
                subscriptionId: skuId,
                token: purchaseToken
            }).then(function(result) {
                if (result.status === 200) {
                    console.log(result.data);
                    return {
                        data: result.data,
                        status: 200,
                        message: "Verified Subscription"
                    };
                } else {
                    console.log("Failed to verify subscription, Try again!");
                    return {
                        data: result.data,
                        status: 500,
                        message: "Failed to verify subscription, Try again!"
                    };
                }
            })
            .catch(function(error) {
                console.log(error);
            });

        })
        .catch(function(error) {
            console.log(error);
        });

}

这是我的 firebase 函数控制台日志:

我尝试使用以下方法在 Android 中获取结果:

    private Task<String> checkUserSubscribed(PurchaseHistoryRecord purchase) {
    Map<String, Object> mapUserPurchase = new HashMap<>();
    mapUserPurchase.put("sku_id", purchase.getSku());
    mapUserPurchase.put("purchase_token", purchase.getPurchaseToken());
    mapUserPurchase.put("package_name", "xxxxxxx");

    return mFirebaseFunctions
            .getHttpsCallable("subcheck")
            .call(mapUserPurchase)
            .continueWith(new Continuation<HttpsCallableResult, String>() {
                @Override
                public String then(@NonNull Task<HttpsCallableResult> task) throws Exception {
                    String result = (String) task.getResult().getData();
                    return result;
                }
            }).addOnCompleteListener(new OnCompleteListener<String>() {
                @Override
                public void onComplete(@NonNull Task<String> task) {
                    String result = task.getResult();
                    Toast.makeText(MainActivity.this, "func results: " + result, Toast.LENGTH_SHORT).show();
                }
            });
}

Answer 1

问题很可能来自以下事实:您没有返回对 verifySubscription() 函数的调用结果:

exports.subcheck = functions.https.onCall((data, context) => {
    subcheck.verifySubscription(data, context);
});

你应该这样做:

exports.subcheck = functions.https.onCall((data, context) => {
    return subcheck.verifySubscription(data, context);
});

<小时/>

此外，您可能应该按如下方式重新组织 Promise 链，以避免嵌套对 then() 的调用，请参阅更多详细信息/说明 here .

exports.verifySubscription = function(data, context) {
    const skuId = data.sku_id;
    const purchaseToken = data.purchase_token;
    const packageName = data.package_name;

    return authClient.authorize()
        .then(result => {
            return playDeveloperApiClient.purchases.subscriptions.get({
                packageName: packageName,
                subscriptionId: skuId,
                token: purchaseToken
            })
        })
        .then(result => {
                if (result.status === 200) {
                    console.log(result.data);
                    return {
                        data: result.data,
                        status: 200,
                        message: "Verified Subscription"
                    };
                } else {
                    console.log("Failed to verify subscription, Try again!");
                    return {
                        data: result.data,
                        status: 500,
                        message: "Failed to verify subscription, Try again!"
                    };
                }
            })
        })
        .catch(function(error) {
            console.log(error);
        });

}

<小时/>

最后，您可以看看 documentation关于可调用云函数中的错误处理。您可以抛出 functions.https.HttpsError 的实例，而不是返回 {data: result.data,status: 500, ...};。