Google Cloud函数调用托管在Google App Engine上的URL [英] Google Cloud functions call URL hosted on Google App Engine

问题描述

我有一个Firebase数据库，我希望创建一个云函数，该函数在将子节点添加到父节点时触发，该函数应使用在父节点中添加的子节点的参数来调用url.

I have a firebase database that I wish to create a cloud function that triggers when adding a child node to the parent node , which should call a url with the parameters of the child node added in the parent node.

将要调用的URL是Google App Engine中托管的NodeJS Express应用.

The URL which would be called is a NodeJS Express app hosted in Google App Engine.

如果可能的话，我该怎么办?

How do I do that, if it is even possible?

推荐答案

您可以使用node.js request 库.

You can use the node.js request library to do so.

由于在Cloud Function中，执行异步任务时必须返回Promise，因此需要使用接口包装进行请求，例如

Since, inside your Cloud Function, you must return a Promise when performing asynchronous tasks, you will need to use an interface wrapper for request, like request-promise.

您可以按照以下方式进行操作:

You could do something along these lines:

.....
var rp = require('request-promise');
.....

exports.yourCloudFucntion = functions.database.ref('/parent/{childId}')
    .onCreate((snapshot, context) => {
      // Grab the current value of what was written to the Realtime Database.
      const createdData = snapshot.val();

      var options = {
          url: 'https://.......',
          method: 'POST',
          body: ....
          json: true // Automatically stringifies the body to JSON
      };

      return rp(options);

    });

---

如果要将参数传递给所调用的HTTP(S)服务/端点，则可以通过请求的正文来完成，例如:

---

If you want to pass parameters to the HTTP(S) service/endpoint you are calling, you can do it through the body of the request, like:

      .....
      const createdData = snapshot.val();

      var options = {
          url: 'https://.......',
          method: 'POST',
          body: {
              some: createdData.someFieldName
          },
          json: true // Automatically stringifies the body to JSON
      };
      .....

或通过一些查询字符串键值对，例如:

or through some query string key-value pairs, like:

      .....
      const createdData = snapshot.val();
      const queryStringObject = { 
         some: createdData.someFieldName,
         another: createdData.anotherFieldName
      };

      var options = {
          url: 'https://.......',
          method: 'POST',
          qs: queryStringObject
      };
      .....

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