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This article will explain in detail how to carry out weather API practice in ServerLess. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Preface

Cloud computing is the trend of the times.

Serverless architecture, namely "service provider" architecture, is a brand-new architecture and a fatal architecture model in the era of cloud computing.

FaaS (Function as a Service-function as a Service) is an execution model for event-driven computing that runs in a stateless container.

Cloud function is a specific form of FaaS. Cloud service providers provide computing platform. Developers only need to pay attention to the implementation of function logic and leave all the configuration management work related to the server to the cloud service provider, instead of spending a lot of energy on server management.

We only need to provide a piece of code, and the FaaS scheme developed by the cloud provider helps us select the best practices of the language corresponding technology stack, dynamically expand computing resources according to actual needs based on the built-in expansion mechanism, easily deploy services to the public network, and provide reliable monitoring and alarm protection, without the need for server resources to be idle most of the time, or to meet large browsing and need emergency capacity expansion.

Give FaaS a function and you can launch a highly available service.

The professional requirements for simple service interface development are reduced, and the front end has more room to play, including, but not limited to:

BFF (Backend For Frontend)

SSR (Server-Side Rendering)

Above a brief introduction to the "cloud function", a little abstract, the following combined with practical operations, to create a "practical"

☁️ makes a simple weather query API.

It's like this: click my experience.

Parameters: cityId region reference table

Technologies and platforms used

Node.js (JavaScript language is selected for cloud function)

Tencent Cloud-free cloud function service

Aliyun-Free Ink Weather query Service

Let's start the hands-on tutorial.

Tencent Cloud side

1. Registered account

Register a Tencent Cloud account and log in

Https://cloud.tencent.com/

two。 Enter the console

Click the upper right corner to enter the console

3. Cloud function-function service

Select cloud product in the upper left corner, enter cloud function, and select cloud function-function service.

4. Create a new cloud function

Create a new cloud function

5. Enter basic information

Function name that conforms to the specification

Environment choose a Node.js environment

Select a blank function

And then the next step

6. Complete creation

Click finish directly and don't change anything

7. Trigger

Then come to this interface and click on trigger Management.

8. Create trigger

Create a trigger and fill in the relevant information

Trigger mode-triggered by API gateway

Request method-GET

Authentication method-exemption from authentication

9. The great task has been completed

Try the generated trigger link

10. Observation interface

Observe the response result and our code

Response result

Our cloud function code

Pay attention to the content in the red box

Execution method: index.main_handler

Index corresponds to index.jsmain_handler, which is the main_handler method exposed in index.js.

Look at the code again.

'use strict'

Exports.main_handler = async (event, context) = > {

Console.log ("Hello World")

Console.log (event)

Console.log (event ["non-exist"])

Console.log (context)

Return event

}

According to the result returned from the above figure, we can see that it corresponds to the content in event: that is, we can get the parameters, header,body and other information we requested in event, so that we can execute the subsequent logic.

Where to see the content of context (the content of console.log)?

11. Log query

In the log query panel, you can query the call information of our interface, the response status and the content of log.

twelve。 Install dependent modules

This is similar to a local installation, with a command and a button.

We use the local terminal to create a package.json file

Npm init-y

Package.json

{

"name": "faas"

"version": "1.0.0"

"description":

"main": "index.js"

"scripts": {

"test": "echo\" Error: no test specified\ "& exit 1"

}

"keywords": []

"author":

"license": "ISC"

}

If you install axios, perform the installation locally.

Yarn add axios

# or

Npm i axios

Package.json at this time

{

"name": "faas"

"version": "1.0.0"

"description":

"main": "index.js"

"scripts": {

"test": "echo\" Error: no test specified\ "& exit 1"

}

"keywords": []

"author":

"license": "ISC"

"dependencies": {

"axios": "^ 0.21.0"

}

}

Create a package.json file on the platform, paste the above content into it, and ctrl/command + S save the modified content.

Select to install dependencies online, and then click Save

The node_modules directory appears after the installation is complete

The process related to the creation of JS cloud functions has been stated.

Let's start with our coding.

Compilation of weather cloud function

The way the code is synchronized online

Files can be uploaded after local editing

Upload using Tencent Cloud's cli tool

Copy and paste

It's easy here, so we copied and pasted it.

First, simply write the general structure, then click Save, and then visit the trigger link just now to observe the result returned.

Index.js

'use strict'

Const http = require ('axios'). Default

Function getNowWeather (cityId = 3) {

/ / to be written

Return {

Data: {

CityId

}

}

}

Exports.main_handler = async (event, context) = > {

/ / structure to get the parameters passed in url

Const {queryString: {cityId}} = event

Return getNowWeather (cityId)

}

The next logic to implement getNowWeather is to use Aliyun's service.

Ali cloud side

Whoring for nothing first.

Aliyun-Free Weather Service (cityid)-Ink Weather

Based on the request example in its documentation, we first build the Node version of the method

Const http = require ('axios'). Default

Function getNowWeather (cityId = 3) {

Const token =''

Const appcode =''

Const nowStatusURL = 'http://freecityid.market.alicloudapi.com/whapi/json/alicityweather/briefcondition' / / streamlined live request URL

Const data = `cityId=$ {cityId} & token=$ {token} `/ / request parameters

Const headers = {/ / header

'Authorization': `APPCODE ${appcode} `

'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'

}

/ / send request

Return http.post (nowStatusURL, data, {

Headers

}) .then (res = > res.data)

}

After purchasing the service, you can find token and appcode according to the documentation.

Console-> API Gateway-> North China 2 (Beijing)

To save time in finding token and appcode, the following steps are listed below (complain that Aliyun's documents are too blocked to locate information)

Token and appcode

API Gateway Page address

Token: application Management-> Select an Application-> authorized API list-> Select the API- you want to view > Click Debug API- > Debug panel token parameter is the required parameter

Appcode: application Management-> Select an application-> AppCode panel

How much does it cost to be a man in Zhengzhou http://www.hnzzxb.com/

Final code

Http://www.zztjyyfk.com/ of Zhengzhou abortion Hospital

Index.js

'use strict'

Const http = require ('axios'). Default

Function getNowWeather (cityId = 3) {

Const token =''

Const appcode =''

Const nowStatusURL = 'http://freecityid.market.alicloudapi.com/whapi/json/alicityweather/briefcondition' / / streamlined live request URL

Const data = `cityId=$ {cityId} & token=$ {token} `/ / request parameters

Const headers = {/ / header

'Authorization': `APPCODE ${appcode} `

'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'

}

/ / send request

Return http.post (nowStatusURL, data, {

Headers

}) .then (res = > res.data)

}

Exports.main_handler = async (event, context) = > {

Const {queryString: {cityId}} = event

Return await getNowWeather (cityId)

}

Trigger link

Last

At this point, a cloud function has been developed.

You can feel that if you are familiar with the creation process, it only takes a few minutes to create an API that provides services, resulting in great cost savings.

Developers who do not understand server deployment, server operation and maintenance, and Linux can quickly build a back-end service through cloud function + cloud database (relational database, non-relational database).

The file storage service can use OSS

Developers only need to call the API provided by each service through the cloud function to complete the construction of a back-end service.

This is the end of the practice of weather API in ServerLess. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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