Summary of practical experience: Using Go language to connect Huawei Cloud interface from scratch

Summary of practical experience: Using Go language to connect Huawei Cloud interface from scratch

Introduction:
With the rapid development of cloud computing, more and more enterprises have begun to migrate their business to the cloud. In this process, the interface to connect to cloud services has become an essential link. As an international cloud computing service provider, Huawei Cloud has attracted much attention for its powerful, stable and reliable cloud products. This article will introduce how to use Go language to connect to Huawei Cloud interfaces from scratch, and provide corresponding code examples.

1. Preparation

1. Register a Huawei Cloud account
   Before we start, we need to register a Huawei Cloud account. If you already have a Huawei Cloud account, you can skip this step directly.
2. Create Huawei Cloud Project
   Log in to the Huawei Cloud console and create a new project in the project list. In order to facilitate management, we can set an independent Access Key for each project.
3. Get Access Key
   In the project settings, find the API key management page and create a new Access Key. This Access Key will serve as our credential for accessing the Huawei Cloud interface.
4. Install the Go language environment
   Before we start writing code, we need to install the Go language environment. You can download the installation package suitable for your operating system from the official website (https://golang.org/dl/), and then follow the installation wizard to install it.

2. Introducing dependency libraries
The Go language has a rich open source community. We can simplify the work of connecting to Huawei Cloud interfaces by introducing third-party dependency libraries. The following are some commonly used dependent libraries:

1. Golang SDK
   Huawei Cloud provides a specialized Golang SDK. By introducing this library, we can easily use various functional interfaces of Huawei Cloud.
2. gin
   gin is a lightweight Go language web framework that can help us quickly build an HTTP server and conveniently handle HTTP requests and responses.

3. Sample code
Next we use a specific function to demonstrate how to connect to Huawei Cloud interface. Taking Huawei Cloud's OBS object storage service as an example, we will create a simple web application to implement file upload and download functions.

First of all, we need to use the obs library in Golang SDK, which can be imported through the following command:

import (
    "github.com/huaweicloud/huaweicloud-sdk-go-obs/obs"
)

In the code, we need to initialize an obsClient:

obsClient, err := obs.New(obsConfig)

where , obsConfig is an instance of obs.Config, which can set Access Key and other parameters.

Next, we can write the interface for uploading files:

router.POST("/upload", func(c *gin.Context) {
    file, _ := c.FormFile("file")
    
    src, _ := file.Open()
    
    obsClient.PutObject(bucketName, file.Filename, src, nil)
    
    c.JSON(http.StatusOK, gin.H{
        "message": "上传成功",
    })
})

In this code, we use the POST method of the gin framework to handle the request to upload files. First, obtain the uploaded file through c.FormFile("file"). Then, upload the file to OBS object storage through the obsClient.PutObject method.

Similarly, we can also write an interface for downloading files:

router.GET("/download", func(c *gin.Context) {
    filename := c.Query("filename")
    
    buffer := &bytes.Buffer{}
    
    obsClient.GetObject(bucketName, filename, nil, buffer)
    
    c.Header("Content-Disposition", "attachment; filename="+filename)
    c.Data(http.StatusOK, "application/octet-stream", buffer.Bytes())
})

In this code, we use the GET method of the gin framework to handle the request to download files. Obtain the file name to be downloaded through c.Query("filename"), then read the file in the OBS object storage into memory through the obsClient.GetObject method, and finally return the file to the user in the form of a stream.

4. Summary
This article uses a specific example to introduce how to use Go language to connect Huawei Cloud interface from scratch. We implemented the file upload and download functions by introducing dependent libraries and using Golang SDK. Through this practical experience, I believe readers can better understand and master the method of using Go language to connect to Huawei Cloud interfaces.

However, it should be noted that the actual development may involve more functions and interfaces, and readers can expand and optimize according to their own needs. I hope this article can be helpful to readers when connecting to Huawei Cloud interfaces.

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