Cloud function pressure measurement based on wechat applet

During the pressure measurement of a project , The wechat applet cloud function needs to be pressure tested , However, cloud functions are called through wechat applets instead of http request , It is not possible to simulate user access through the pressure test tool , So how to measure the cloud function ？

What is a cloud function ？

Official document of wechat applet That's how it's described ：

The cloud function is in the cloud （ Server side ） Running functions . No need to buy 、 Set up server , Just write the function code and deploy it to the cloud to call on the applet side , At the same time, cloud functions can also call each other .

Let's look at an example of a cloud function ：

// ...
exports.main = async (event, context) => {
  // ...
  return {
    sum: event.a + event.b
  }
}

The above code implements ： Will the incoming a and b Add as sum Field is returned to the caller .

Before calling this cloud function in a small program , You need to deploy the cloud function to the cloud first . After deployment , The cloud function can be called in the applet ：

wx.cloud.callFunction({
  //  Cloud function name 
  name: 'add',
  //  Parameters passed to cloud function 
  data: {
    a: 1,
    b: 2,
  },
  success: function(res) {
    console.log(res.result.sum) // 3
  },
  fail: console.error
})

This successfully creates a simple cloud function , And successfully call... In the applet .

How to realize cloud function pressure measurement ？

As can be seen from the above section , Cloud functions are called through wechat applets , The general pressure measurement pursues commonality , Will be based on http Request for pressure test . Is it possible for the cloud function to pass http Request to third party （ Non wechat applet ） To call ？

Here are three options to try ：

Method 1 according to appid and secret obtain access_token To trigger the cloud function

Step 1 ： call auth.getAccessToken Interface , According to the applet unique credentials appid and Applet unique credential key secret Get the globally unique background interface call credentials of the applet access_token（ appid and secret It can be obtained when the applet is registered ）

Request address ：GET https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

Request parameters ：

Return value ：

adopt postman Call the interface to get access_token

See ：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/access-token/auth.getAccessToken.html

Step 2 ： call invokeCloudFunction Interface , With https Method to request cloud functions

Request address ：POST https://api.weixin.qq.com/tcb/invokecloudfunction?access_token=ACCESS_TOKEN&env=ENV&name=FUNCTION_NAME

Request parameters ：

Return value ：

adopt postman Call the interface to trigger the cloud function

See ：https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-http-api/functions/invokeCloudFunction.html

This method of accessing cloud functions Checkpoint lie in ：

The cloud functions developed by the cloud are seamlessly integrated with wechat login authentication . When the applet calls the cloud function , The incoming parameters of the cloud function will be injected into the applet end users openid, And by http api Method to trigger cloud functions without user information , therefore , This method Is not workable .

See ：https://developers.weixin.qq.com/minigame/dev/wxcloud/guide/functions/userinfo.html

Method 2 Manually realize concurrent pressure measurement 、 The logic of the calculation results

Pressure measurement is divided into pressure measurement end （ hereinafter referred to as A End ）, Service under pressure test （ hereinafter referred to as B End ）.

Process implementation to be updated ...

Method 3 Create a new cloud function http Trigger path

Add cloud functions to the cloud development module of Tencent cloud Trigger path , Get the... Corresponding to the cloud function http request URL, be used for jmeter The isobaric tool configuration script performs pressure testing on cloud functions , The specific steps are as follows ：

1. Get into Development of cloud CloudBase modular , Click on Cloud functions

1. Cloud function /test For example , If you want to test Cloud function for pressure measurement ： Request parameters ：
2. Get into http Access the service interface ：
3. choice “ Click the jump ”
4. Click on “ newly build ”
5. Create a trigger path for the required pressure measurement cloud function ：
6. After setting up the trigger path , Click the corresponding function , You can trigger the request cloud function in the browser ：
7. Copy the browser address bar URL, You can get the cloud function http request URL, be used for jmeter Script configuration .

In contrast , Adopting method 3 can quickly realize cloud function pressure measurement .

summary

If necessary Cloud function for pressure measurement , You can add pressure test in Tencent cloud function module Trigger path of cloud function , obtain http Request to implement the pressure test of cloud functions .