Question

当用户登录我的应用程序时，我想将初始详细信息（如用户联系人列表）发送到后端以处理用户创建。由于这是一项很长的工作，我想分成单独的HTTPs调用。

为简单起见，这是应用程序端请求：

exports.sandbox = functions.https.onCall((data, context) => {
    console.log("In, data.val is " + data.val);
});

和HTTPs函数（在Node.js中）：

firebase functions:shell

如果我通过for (let i = 0; i < 3; ++i) { sandbox.post('').json({"data": {"val": "" + i}}); } shell调用该函数，如下所示：

In, data.val is 0
In, data.val is 1
In, data.val is 2

我得到了输出：

2018-05-16T10:09:02.080247334Z D sandbox: Function execution started
2018-05-16T10:09:02.080333313Z D sandbox: Billing account not configured. 
    External network is not accessible and quotas are severely limited. 
    Configure billing account to remove these restrictions
2018-05-16T10:09:03.051Z I sandbox: In, data.val is 2
2018-05-16T10:09:03.135023272Z D sandbox: Function execution took 1056 ms, finished with status code: 200
2018-05-16T10:09:04.073804790Z D sandbox: Function execution started
2018-05-16T10:09:04.073930247Z D sandbox: Billing account not configured. 
    External network is not accessible and quotas are severely limited. 
    Configure billing account to remove these restrictions
2018-05-16T10:09:04.236Z I sandbox: In, data.val is 2
2018-05-16T10:09:04.239244077Z D sandbox: Function execution took 166 ms, finished with status code: 200
2018-05-16T10:09:06.722270621Z D sandbox: Function execution started
2018-05-16T10:09:06.722387172Z D sandbox: Billing account not configured. 
    External network is not accessible and quotas are severely limited. 
    Configure billing account to remove these restrictions
2018-05-16T10:09:09.963Z I sandbox: In, data.val is 2
2018-05-16T10:09:09.971406186Z D sandbox: Function execution took 3250 ms, finished with status code: 200

但是，如果应用代码运行，Firebase控制台会显示以下日志：

In, data.val is 2

我看了{{1}}三次。发生了什么事？

Answer 1

请记住firebaseFunctions.getHttpsCallable("sandbox").call(data)是异步的，这意味着它会立即返回。您的代码将快速连续启动三个电话。

另请注意，他们都共享相同的data对象。这里可能发生的是，数据的“最终”静止值包含值为2的val键。这很可能是三个调用中的每个调用最终都会发送到函数，因为循环将完成执行在每个请求发出之前。

不是在循环的每次迭代中修改相同的data，而是创建 new 数据对象，并使用每个请求所需的所有数据填充它（不要重复使用请求之间的数据对象。）

在循环中查询firebase HTTPs函数只会多次调用最后一次调用

1 个答案: