Teach you how to use Go language to connect to Huawei Cloud interface

Teach you how to use Go language to connect to Huawei Cloud interface

As a leading global cloud service provider, Huawei Cloud provides a wealth of API interfaces for developers to use. During the development process, we often need to use these interfaces to complete various tasks, such as creating and managing cloud servers, storing files, etc. This article will introduce how to use the Go language to connect to Huawei Cloud interfaces and provide some sample codes.

1. Preliminary preparations
Before starting to use Go language to connect to Huawei Cloud interface, we need to do some preparations first.

1. Register a Huawei Cloud account and activate corresponding services
   If you do not have a Huawei Cloud account yet, you need to register an account and log in first. After logging in, activate corresponding services according to your needs, such as ECS (Elastic Cloud Server), OBS (Object Storage Service), etc.
2. Create API key
   In order to use Huawei Cloud's API interface, we need to create an API key. In the Huawei Cloud Console, enter the "My Credentials" page, click the "Create New Key" button, and follow the prompts to generate a key pair (Access Key and Secret Key).
3. Install the Go language environment
   Before we start writing code, we need to install the Go language environment. You can download and install the appropriate Go language version from the Go official website (https://golang.org).

2. Basic steps for using Go language to connect to Huawei Cloud interface

1. Introducing dependency packages
   First, we need to introduce some Go language dependency packages , used for operations such as sending HTTP requests and parsing JSON data. Add the following lines to the code:

   import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
   )

2. Constructing the request URL and parameters
   Next, we need to construct the request URL and parameters. Taking ECS ​​(Elastic Cloud Server) as an example, assuming we want to query the list of all cloud servers, we can construct the following URL and parameters:

   accessKey := "your-access-key"
   secretKey := "your-secret-key"
   projectID := "your-project-id"
   
   url := fmt.Sprintf("https://ecs.%s.myhuaweicloud.com/v1/%s/servers", region, projectID)
   params := map[string]string{
    "limit": 50,
   }

   Among them, accessKey and secretKey are the API keys you created, and projectID is The project ID you created on the Huawei Cloud Console, region is the region where the cloud server you want to access is located.

3. Send HTTP request
   Next, we need to send an HTTP request to access Huawei Cloud's API interface and obtain the returned data. Add the following lines to the code:

   req, _ := http.NewRequest("GET", url, nil)
   req.Header.Add("Content-Type", "application/json")
   req.Header.Add("X-Auth-Token", accessToken)
   
   client := &http.Client{}
   resp, _ := client.Do(req)
   defer resp.Body.Close()
   
   body, _ := ioutil.ReadAll(resp.Body)

   Among them, we use http.NewRequest to create a GET request and set the request headers, including Content-Type and X-Auth-Token. Send a request through http.Client and read the returned data.

4. Parse JSON data
   Finally, we need to parse the returned JSON data. Taking ECS ​​(Elastic Cloud Server) as an example, assume that the returned JSON data format is as follows:

   {
    "servers": [
        {
            "id": "server-id-1",
            "name": "server-1",
            "status": "ACTIVE"
        },
        {
            "id": "server-id-2",
            "name": "server-2",
            "status": "SHUTOFF"
        }
    ]
   }

   We can define a structure to represent the server information:

   type Server struct {
    ID     string `json:"id"`
    Name   string `json:"name"`
    Status string `json:"status"`
   }

   Then, through json.Unmarshal Parse the returned JSON data and convert it into a structure object:

   var data struct {
    Servers []Server `json:"servers"`
   }
   
   json.Unmarshal(body, &data)

At this point, we have completed the basic steps of using the Go language to connect to Huawei Cloud interfaces. According to different interfaces and needs, we can make corresponding adjustments according to the above steps.

3. Sample code

The following is a complete sample code for querying the ECS (elastic cloud server) list:

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

type Server struct {
    ID     string `json:"id"`
    Name   string `json:"name"`
    Status string `json:"status"`
}

func main() {
    accessKey := "your-access-key"
    secretKey := "your-secret-key"
    projectID := "your-project-id"
    region := "cn-north-1"

    url := fmt.Sprintf("https://ecs.%s.myhuaweicloud.com/v1/%s/servers", region, projectID)
    params := map[string]string{
        "limit": "50",
    }

    req, _ := http.NewRequest("GET", url, nil)
    req.Header.Add("Content-Type", "application/json")
    req.Header.Add("X-Auth-Token", accessToken)

    client := &http.Client{}
    resp, _ := client.Do(req)
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)

    var data struct {
        Servers []Server `json:"servers"`
    }

    json.Unmarshal(body, &data)

    for _, server := range data.Servers {
        fmt.Printf("Server ID: %s, Name: %s, Status: %s
", server.ID, server.Name, server.Status)
    }
}

The above is a simple example. From this example, we can learn that the basic steps for using Go language to connect to Huawei Cloud interfaces are: introducing dependency packages, constructing request URLs and parameters, sending HTTP requests, and parsing the returned JSON data. According to the specific interfaces and needs, we can make corresponding expansions and adjustments.

Summary
This article introduces how to use Go language to connect to Huawei Cloud interface, and provides a sample code for querying the ECS (Elastic Cloud Server) list. Through this example, we can learn how to construct the request URL and parameters, send HTTP requests, parse the returned JSON data and other basic steps. I hope this article can help developers who are using Go language to develop Huawei Cloud applications. If you have any questions or doubts, please leave a message for discussion.

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