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Huawei Cloud Go Software Development Kit (Go SDK)
The Huawei Cloud Go SDK allows you to easily work with Huawei Cloud services such as Elastic Compute Service (ECS) and
Virtual Private Cloud (VPC) without the need to handle API related tasks.
This document introduces how to obtain and use Huawei Cloud Go SDK.
Requirements
-
To use Huawei Cloud Go SDK, you must have Huawei Cloud account as well as the Access Key (AK) and Secret key (SK) of the Huawei
Cloud account. You can create an AccessKey in the Huawei Cloud console. For more information,
see My Credentials.
-
To use Huawei Cloud Go SDK to access the APIs of specific service, please make sure you do have activated the service
in Huawei Cloud console if needed.
-
Huawei Cloud Go SDK requires go 1.14 or later, run command go version
to check the version of Go.
Install Go SDK
Run the following command to install Huawei Cloud Go SDK:
# Install the library of Huawei Cloud Go SDK
go get github.com/huaweicloud/huaweicloud-sdk-go-v3
Code Example
- The following example shows how to query a list of VPCs in a specific region, you need to substitute your
real
{service} "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/{service}/{version}"
for vpc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2"
in actual use, and initialize the client
as {service}.New{Service}Client
.
- Substitute the values for
{your ak string}
and {your sk string}
ใ
Simplified Demo
package main
import (
"fmt"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
vpc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2"
vpcModel "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2/model"
vpcRegion "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2/region"
)
func main() {
// Configure authentication
auth := basic.NewCredentialsBuilder().
WithAk("{your ak string}").
WithSk("{your sk string}").
Build()
// Create a service client
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithRegion(vpcRegion.ValueOf("cn-north-4")).
WithCredential(auth).
Build())
// Send the request and get the response
request := &vpcModel.ListVpcsRequest{}
response, err := client.ListVpcs(request)
if err == nil {
fmt.Printf("%+v\n", response)
} else {
fmt.Println(err)
}
}
Detailed Demo
package main
import (
"context"
"fmt"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/config"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/httphandler"
vpc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2"
vpcModel "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2/model"
vpcRegion "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2/region"
"net"
"net/http"
)
func main() {
// Configure authentication
auth := basic.NewCredentialsBuilder().
// Access Key and Secret Access Key used for authentication
WithAk("{your ak string}").
WithSk("{your sk string}").
// If ProjectId is not filled in, the SDK will automatically call the IAM service to query the project id corresponding to the region.
WithProjectId("{your projectId string}").
// Configure the SDK built-in IAM service endpoint, default is https://iam.myhuaweicloud.com
WithIamEndpointOverride("https://iam.cn-north-4.myhuaweicloud.com").
Build()
// Use default configuration
httpConfig := config.DefaultHttpConfig()
// Configure whether to ignore the SSL certificate verification, default is false
httpConfig.WithIgnoreSSLVerification(true)
// Configure timeout as needed, default timeout is 120 seconds
httpConfig.WithTimeout(120)
// Configure proxy as needed
proxy := config.NewProxy().
WithSchema("http").
WithHost("proxy.huaweicloud.com").
WithPort(80).
WithUsername("testuser").
WithPassword("password")
httpConfig.WithProxy(proxy)
// Configure how to create network connections as needed
dialContext := func(ctx context.Context, network string, addr string) (net.Conn, error) {
return net.Dial(network, addr)
}
httpConfig.WithDialContext(dialContext)
// Configure HTTP handler for debugging, do not use in production environment
requestHandler := func(request http.Request) {
fmt.Println(request)
}
responseHandler := func(response http.Response) {
fmt.Println(response)
}
httpHandler := httphandler.NewHttpHandler().AddRequestHandler(requestHandler).AddResponseHandler(responseHandler)
httpConfig.WithHttpHandler(httpHandler)
// Create a service client
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
// Configure region, it will cause a panic if the region does not exist
WithRegion(vpcRegion.ValueOf("cn-north-4")).
// Configure authentication
WithCredential(auth).
// Configure HTTP
WithHttpConfig(httpConfig).
Build())
// Create a request
request := &vpcModel.ListVpcsRequest{}
// Configure the number of records on each page
limit := int32(1)
request.Limit = &limit
// Send the request and get the response
response, err := client.ListVpcs(request)
// Handle error and print response
if err == nil {
fmt.Printf("%+v\n", response)
} else {
fmt.Println(err)
}
}
Online Debugging
API Explorer provides api retrieval and online debugging, supports full fast retrieval, visual debugging, help document viewing, and online consultation.
Changelog
Detailed changes for each released version are documented in
the CHANGELOG.md.
User Manual ๐
1. Client Configuration ๐
1.1 Default Configuration ๐
import "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/config"
// Use default configuration
httpConfig := config.DefaultHttpConfig()
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
1.2 Network Proxy ๐
// Use proxy if needed
proxy := config.NewProxy().
WithSchema("http").
WithHost("proxy.huaweicloud.com").
WithPort(80).
WithUsername("testuser").
WithPassword("password")
httpConfig := config.DefaultHttpConfig().WithProxy(proxy)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
1.3 Timeout Configuration ๐
// The default timeout is 120 seconds, which can be adjusted as needed
httpConfig := config.DefaultHttpConfig().WithTimeout(120)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
1.4 SSL Certification ๐
// Skip SSL certification checking while using https protocol if needed
httpConfig := config.DefaultHttpConfig().WithIgnoreSSLVerification(true)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
1.5 Custom Network Connection ๐
// Config network connection dial function if needed
func DialContext(ctx context.Context, network string, addr string) (net.Conn, error) {
return net.Dial(network, addr)
}
httpConfig := config.DefaultHttpConfig().WithDialContext(DialContext)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
1.6 Custom HTTP Transport ๐
NOTE: The configuration has the highest priority.
Specifying the custom HTTP transport will invalidate the configurations 1.2 Network Proxy, 1.4 SSL Certification, 1.5 Custom Network Connection.
transport := &http.Transport{}
httpConfig := config.DefaultHttpConfig().WithHttpTransport(transport)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
2. Credentials Configuration ๐
There are two types of Huawei Cloud services, regional
services and global
services.
Global services contain BSS, DevStar, EPS, IAM, RMS.
For regional
services' authentication, projectId is required to initialize basic.NewCredentialsBuilder().
For global
services' authentication, domainId is required to initialize global.NewCredentialsBuilder().
The following authentications are supported:
- permanent AK&SK
- temporary AK&SK + SecurityToken
- IdpId&IdTokenFile
2.1 Use Permanent AK&SK ๐
Parameter description:
ak
is the access key ID for your account.
sk
is the secret access key for your account.
projectId
is the ID of your project depending on your region which you want to operate.
domainId
is the account ID of Huawei Cloud.
// Regional Services
basicCredentials := basic.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithProjectId(projectId).
Build()
// Global Services
globalCredentials := global.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithDomainId(domainId).
Build()
Notice:
- projectId/domainId supports automatic acquisition in version
0.0.26-beta
or later, if you want to use this
feature, you need to provide the ak and sk of your account and the id of the region, and then build your client
instance with method WithRegion()
, detailed example could refer
to 3.2 Initialize client with specified Region
.
2.2 Use Temporary AK&SK ๐
It's required to obtain temporary AK&SK and security token first, which could be obtained through
permanent AK&SK or through an agency.A temporary access key and securityToken are issued by the system to IAM users, and can be valid for 15 minutes to 24 hours.
Parameter description:
ak
is the access key ID for your account.
sk
is the secret access key for your account.
securityToken
is the security token when using temporary AK/SK.
projectId
is the ID of your project depending on your region which you want to operate.
domainId
is the account ID of Huawei Cloud.
// Regional Services
basicCredentials := basic.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithProjectId(projectId).
WithSecurityToken(securityToken).
Build()
// Global Services
globalCredentials := global.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithDomainId(domainId).
WithSecurityToken(securityToken).
Build()
In the following two cases, the temporary AK/SK and securitytoken will be obtained from the metadata of the instance:
- basic.Credentials or global.Credentials were not explicitly specified when creating the client.
- AK/SK was not explicitly specified when creating basic.Credentials or global.Credentials.
Refer to the Obtaining Metadata for more information.
// Regional Services
basicAuth := basic.NewCredentialsBuilder().WithProjectId(projectId).Build()
// Global Services
globalAuth := global.NewCredentialsBuilder().WithDomainId(domainId).Build()
2.3 Use IdpId&IdTokenFile ๐
Obtain a federated identity authentication token using an OpenID Connect ID token, refer to the Obtaining a Token with an OpenID Connect ID Token
Parameter description:
idpId
Identity provider ID.
idTokenFile
Id token file path. Id token is constructed by the enterprise IdP to carry the identity information of federated users.
projectId
is the ID of your project depending on your region which you want to operate.
domainId
is the account ID of Huawei Cloud.
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/global"
)
// Regional service
basicAuth := basic.NewCredentialsBuilder().
WithIdpId(idpId).
WithIdTokenFile(idTokenFile).
WithProjectId(projectId).
Build()
// Global service
globalAuth := global.NewCredentialsBuilder().
WithIdpId(idpId).
WithIdTokenFile(idTokenFile).
WithDomainId(domainId).
Build()
2.4 Authentication Management ๐
Getting Authentication from providers is supported since v0.0.96
Regional services use BasicCredentialXxxProvider
, Global services use GlobalCredentialXxxProvider
2.4.1 Environment Variables ๐
AK/SK Auth
Environment Variables |
Notice |
HUAWEICLOUD_SDK_AK |
Required๏ผAccessKey |
HUAWEICLOUD_SDK_SK |
Required๏ผSecretKey |
HUAWEICLOUD_SDK_SECURITY_TOKEN |
Optional, this parameter needs to be specified when using temporary ak/sk |
HUAWEICLOUD_SDK_PROJECT_ID |
Optional, used for regional services, required in multi-ProjectId scenarios |
HUAWEICLOUD_SDK_DOMAIN_ID |
Optional, used for global services |
Configure environment variables:
// Linux
export HUAWEICLOUD_SDK_AK=YOUR_AK
export HUAWEICLOUD_SDK_SK=YOUR_SK
// Windows
set HUAWEICLOUD_SDK_AK=YOUR_AK
set HUAWEICLOUD_SDK_SK=YOUR_SK
Get the credentials from configured environment variables:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicProvider := provider.BasicCredentialEnvProvider()
basicCred, err := basicProvider.GetCredentials()
// global
globalProvider := provider.GlobalCredentialEnvProvider()
globalCred, err := globalProvider.GetCredentials()
IdpId/IdTokenFile Auth
Environment Variables |
Notice |
HUAWEICLOUD_SDK_IDP_ID |
Required, identity provider Id |
HUAWEICLOUD_SDK_ID_TOKEN_FILE |
Required, id token file path |
HUAWEICLOUD_SDK_PROJECT_ID |
For basic credentials, this parameter is required |
HUAWEICLOUD_SDK_DOMAIN_ID |
For global credentials, this parameter is required |
Configure environment variables:
// Linux
export HUAWEICLOUD_SDK_IDP_ID=YOUR_IDP_ID
export HUAWEICLOUD_SDK_ID_TOKEN_FILE=/some_path/your_token_file
export HUAWEICLOUD_SDK_PROJECT_ID=YOUR_PROJECT_ID // For basic credentials, this parameter is required
export HUAWEICLOUD_SDK_DOMAIN_ID=YOUR_DOMAIN_ID // For global credentials, this parameter is required
// Windows
set HUAWEICLOUD_SDK_IDP_ID=YOUR_IDP_ID
set HUAWEICLOUD_SDK_ID_TOKEN_FILE=/some_path/your_token_file
set HUAWEICLOUD_SDK_PROJECT_ID=YOUR_PROJECT_ID // For basic credentials, this parameter is required
set HUAWEICLOUD_SDK_DOMAIN_ID=YOUR_DOMAIN_ID // For global credentials, this parameter is required
Get the credentials from configured environment variables:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicProvider := provider.BasicCredentialEnvProvider()
basicCred, err := basicProvider.GetCredentials()
// global
globalProvider := provider.GlobalCredentialEnvProvider()
globalCred, err := globalProvider.GetCredentials()
2.4.2 Profile ๐
The profile will be read from the user's home directory by default, linux~/.huaweicloud/credentials
,windowsC:\Users\USER_NAME\.huaweicloud\credentials
, the path to the profile can be modified by configuring the environment variable HUAWEICLOUD_SDK_CREDENTIALS_FILE
AK/SK Auth
Configuration Parameters |
Notice |
ak |
Required๏ผAccessKey |
sk |
Required๏ผSecretKey |
security_token |
Optional, this parameter needs to be specified when using temporary ak/sk |
project_id |
Optional, used for regional services, required in multi-ProjectId scenarios |
domain_id |
Optional, used for global services |
iam_endpoint |
optional, endpoint for authentication, default is https://iam.myhuaweicloud.com |
The content of the profile is as follows:
[basic]
ak = your_ak
sk = your_sk
[global]
ak = your_ak
sk = your_sk
Get the credentials from profile:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicProvider := provider.BasicCredentialProfileProvider()
basicCred, err := basicProvider.GetCredentials()
// global
globalProvider := provider.GlobalCredentialProfileProvider()
globalCred, err := globalProvider.GetCredentials()
IdpId/IdTokenFile Auth
Configuration Parameters |
Notice |
idp_id |
Required, identity provider Id |
id_token_file |
Required, id token file path |
project_id |
For basic credentials, this parameter is required |
domain_id |
For global credentials, this parameter is required |
iam_endpoint |
optional, endpoint for authentication, default is https://iam.myhuaweicloud.com |
The content of the profile is as follows:
[basic]
idp_id = your_idp_id
id_token_file = /some_path/your_token_file
project_id = your_project_id
[global]
idp_id = your_idp_id
id_token_file = /some_path/your_token_file
domainId = your_domain_id
Get the credentials from profile:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicProvider := provider.BasicCredentialProfileProvider()
basicCred, err := basicProvider.GetCredentials()
// global
globalProvider := provider.GlobalCredentialProfileProvider()
globalCred, err := globalProvider.GetCredentials()
Get temporary AK/SK and securitytoken from instance's metadata. Refer to the Obtaining Metadata for more information.
Manually obtain authentication from instance metadata:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicProvider := provider.BasicCredentialMetadataProvider()
basicCred, err := basicProvider.GetCredentials()
// global
globalProvider := provider.GlobalCredentialMetadataProvider()
globalCred, err := globalProvider.GetCredentials()
2.4.4 Provider Chain ๐
When creating a service client without credentials, try to load authentication in the order Environment Variables -> Profile -> Metadata
Get authentication from provider chain:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
// basic
basicChain := provider.BasicCredentialProviderChain()
basicCred, err := basicChain.GetCredentials()
// global
globalChain := provider.GlobalCredentialProviderChain()
globalCred, err := globalChain.GetCredentials()
Custom credentials provider chain is supported:
import (
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/provider"
)
providers := []provider.ICredentialProvider{
provider.BasicCredentialMetadataProvider(),
provider.BasicCredentialProfileProvider(),
}
chain := provider.NewCredentialProviderChain(providers)
cred, err := chain.GetCredentials()
3. Client Initialization ๐
There are two ways to initialize the {Service}Client, you could choose one you preferred.
3.1 Initialize the {Service}Client with specified Endpoint ๐
// Specify the endpoint, take the endpoint of VPC service in region of cn-north-4 for example
endpoint := "https://vpc.cn-north-4.myhuaweicloud.com"
// Initialize the credentials, you should provide projectId or domainId in this way, take initializing BasicCredentials for example
basicAuth := basic.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithProjectId(projectId).
Build()
// Initialize specified New{Service}Client, take initializing the regional service VPC's VpcClient for example
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithEndpoint(endpoint).
WithCredential(basicCredentials).
WithHttpConfig(config.DefaultHttpConfig()).
Build())
where:
-
endpoint
varies with services and regions,
see Regions and Endpoints to obtain correct endpoint.
-
When you meet some trouble in getting projectId using the specified region way, you could use this way instead.
3.2 Initialize the {Service}Client with specified Region (Recommended) ๐
import (
// dependency for region module
"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/iam/v3/region"
)
// Initialize the credentials, projectId or domainId could be unassigned in this situation, take initializing GlobalCredentials for example
globalCredentials := global.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
// domainId could be unassigned in this situation
Build()
// Initialize specified New{Service}Client, take initializing the global service IAM's NewIamClient for example
client := iam.NewIamClient(
iam.IamClientBuilder().
WithRegion(region.CN_NORTH_4).
WithCredential(globalCredentials).
WithHttpConfig(config.DefaultHttpConfig()).
Build())
Notice:
-
If you use region
to initialize {Service}Client, projectId/domainId supports automatic acquisition, you don't need
to configure it when initializing Credentials.
-
Multiple ProjectId situation is not supported.
-
Supported region list: af-south-1, ap-southeast-1, ap-southeast-2, ap-southeast-3, cn-east-2, cn-east-3, cn-north-1,
cn-north-4, cn-south-1, cn-southwest-2, ru-northwest-2. You may get exception such as Unsupported regionId
if your
region don't in the list above.
Comparison of the two ways:
Initialization |
Advantages |
Disadvantage |
Specified Endpoint |
The API can be invoked successfully once it has been published in the environment. |
You need to prepare projectId and endpoint yourself. |
Specified Region |
No need for projectId and endpoint, it supports automatic acquisition if you configure it in the right way. |
The supported services and regions are limited. |
3.3 Custom Configuration ๐
Notice: Supported since v0.0.92
3.3.1 IAM endpoint configuration ๐
Automatically acquiring projectId/domainId will invoke the KeystoneListProjects /KeystoneListAuthDomains interface of IAM service. The default iam endpoint is https://iam.myhuaweicloud.com
, European station users need to specify the endpoint as https://iam.eu-west-101.myhuaweicloud.com, you can modify the endpoint in the following two ways:
3.3.1.1 Global scope
๐
This configuration takes effect globally, specified by environment variable HUAWEICLOUD_SDK_IAM_ENDPOINT
//linux
export HUAWEICLOUD_SDK_IAM_ENDPOINT=https://iam.cn-north-4.myhuaweicloud.com
//windows
set HUAWEICLOUD_SDK_IAM_ENDPOINT=https://iam.cn-north-4.myhuaweicloud.com
3.3.1.2 Credentials scope
๐
This configuration is only valid for a credential, and it will override the global configuration
import "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
iamEndpoint := "https://iam.cn-north-4.myhuaweicloud.com"
cred := basic.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithIamEndpointOverride(iamEndpoint).
Build()
3.3.2 Region configuration ๐
3.3.2.1 Environment variable
๐
Specified by environment variable, the format is HUAWEICLOUD_SDK_REGION_{SERVICE_NAME}_{REGION_ID}={endpoint}
Notice: the name of environment variable is UPPER-CASE, replacing hyphens with underscores.
// Take ECS and IoTDA services as examples
// linux
export HUAWEICLOUD_SDK_REGION_ECS_CN_NORTH_9=https://ecs.cn-north-9.myhuaweicloud.com
export HUAWEICLOUD_SDK_REGION_IOTDA_AP_SOUTHEAST_1=https://iotda.ap-southwest-1.myhuaweicloud.com
// windows
set HUAWEICLOUD_SDK_REGION_ECS_CN_NORTH_9=https://ecs.cn-north-9.myhuaweicloud.com
set HUAWEICLOUD_SDK_REGION_IOTDA_AP_SOUTHEAST_1=https://iotda.ap-southwest-1.myhuaweicloud.com
A region corresponding to multiple endpoints is supported since v0.1.60, if the main endpoint cannot be connected, it will automatically switch to the backup endpoint.
The format is HUAWEICLOUD_SDK_REGION_{SERVICE_NAME}_{REGION_ID}={endpoint1},{endpoint2}
, separate multiple endpoints with commas, such as HUAWEICLOUD_SDK_REGION_ECS_CN_NORTH_9=https://ecs.cn-north-9.myhuaweicloud.com,https://ecs.cn-north-9.myhuaweicloud.cn
The profile will be read from the user's home directory by default, linux~/.huaweicloud/regions.yaml
, windowsC:\Users\USER_NAME\.huaweicloud\regions.yaml
, the default file may not exist, but if the file exists and the content format is incorrect, an exception will be thrown for parsing errors.
The path to the profile can be modified by configuring the environment variable HUAWEICLOUD_SDK_REGIONS_FILE
, like HUAWEICLOUD_SDK_REGIONS_FILE=/tmp/my_regions.yml
The file content format is as follows:
# Serivce name is case-insensitive
ECS:
- id: 'cn-north-1'
endpoint: 'https://ecs.cn-north-1.myhuaweicloud.com'
- id: 'cn-north-9'
endpoint: 'https://ecs.cn-north-9.myhuaweicloud.com'
IoTDA:
- id: 'ap-southwest-1'
endpoint: 'https://iotda.ap-southwest-1.myhuaweicloud.com'
A region corresponding to multiple endpoints is supported since v0.1.62, if the main endpoint cannot be connected, it will automatically switch to the backup endpoint.
ECS:
- id: 'cn-north-1'
endpoints:
- 'https://ecs.cn-north-1.myhuaweicloud.com'
- 'https://ecs.cn-north-1.myhuaweicloud.cn'
3.3.2.3 Region supply chain
๐
The default order is environment variables -> profile -> region defined in SDK, if the region is not found in the above ways, an exception will be thrown.
import "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ecs/v2/region"
var (
region1 = region.ValueOf("cn-north-1")
region2 = region.ValueOf("cn-north-9")
)
4. Send Requests and Handle Responses ๐
// send a request and print response, take interface of ListVpcs for example
limit := int32(1)
request := &model.ListVpcsRequest{
Limit: &limit,
}
response, err := client.ListVpcs(request)
if err == nil {
fmt.Printf("%+v\n\n", response.Vpcs)
} else {
fmt.Println(err)
}
4.1 Exceptions ๐
Level 1 |
Notice |
ServiceResponseError |
service response error |
url.Error |
connect endpoint error |
response, err := client.ListVpcs(request)
if err == nil {
fmt.Printf("%+v\n\n", response.Vpcs)
} else {
fmt.Println(err)
}
5. Troubleshooting ๐
5.1 Original HTTP Listener ๐
In some situation, you may need to debug your http requests, original http request and response information will be
needed. The SDK provides a listener function to obtain the original encrypted http request and response information.
โ Warning: The original http log information is used in debugging stage only, please do not print the original http header or body in the production environment. This log information is not encrypted and contains sensitive data such as the password of your ECS virtual machine, or the password of your IAM user account, etc. When the response body is binary content, the body will be printed as "***" without detailed information.
import (
"fmt"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/config"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/httphandler"
vpc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/vpc/v2"
"net/http"
)
func RequestHandler(request http.Request) {
fmt.Println(request)
}
func ResponseHandler(response http.Response) {
fmt.Println(response)
}
handler := httphandler.NewHttpHandler().
AddRequestHandler(RequestHandler).
AddResponseHandler(ResponseHandler)
httpConfig := config.DefaultHttpConfig().WithHttpHandler(handler)
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithHttpConfig(httpConfig).
Build())
6. Upload and download files ๐
Take the interface CreateImageWatermark
of the service Data Security Center
as an example, this interface needs to upload an image file and return the watermarked image file stream:
package main
import (
"fmt"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/def"
dsc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dsc/v1"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dsc/v1/model"
"os"
)
func createImageWatermark(client *dsc.DscClient) {
// Open the file.
file, err := os.Open("demo.jpg")
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
body := &model.CreateImageWatermarkRequestBody{
File: def.NewFilePart(file),
BlindWatermark: def.NewMultiPart("test_watermark"),
}
request := &model.CreateImageWatermarkRequest{Body: body}
response, err := client.CreateImageWatermark(request)
if err == nil {
fmt.Printf("%+v\n", response)
} else {
fmt.Println(err)
return
}
// Download the file.
result, err := os.Create("result.jpg")
if err != nil {
fmt.Println(err)
return
}
response.Consume(result)
}
func main() {
ak := "{your ak string}"
sk := "{your sk string}"
endpoint := "{your endpoint string}"
projectId := "{your project id}"
credentials := basic.NewCredentialsBuilder().
WithAk(ak).
WithSk(sk).
WithProjectId(projectId).
Build()
client := dsc.NewDscClient(
dsc.DscClientBuilder().
WithEndpoint(endpoint).
WithCredential(credentials).
Build())
createImageWatermark(client)
}
7. Retry For Request ๐
When a request encounters a network exception or flow control on the interface, the request needs to be retried. The
Go SDK provides the retry method for our users which could be used to the requests of GET
HTTP method.
If you want to use the retry method, the following parameters are required:
- maxRetryTimes: the max retry times
- retryCondition: a function, which determine the condition of when to retry
- backoffStrategy: calculate the wait duration before next retry
Take the interface ListVpcs
of VPC service for example, assume the request would retry at most 3 times,
retry when service responses an error, the code would be like the following:
// initialize the client
client := vpc.NewVpcClient(
vpc.VpcClientBuilder().
WithEndpoint("<input your endpoint>").
WithCredential(
basic.NewCredentialsBuilder().
WithAk("<input your ak>").
WithSk("<input your sk>").
WithProjectId("<input your project id>").
Build()).
Build())
// initialize the request
request := &model.ListVpcsRequest{}
// send the requet and retry when service responses an error
response, err := client.ListVpcsInvoker(request).WithRetry(3, func(i interface{}, err error) bool {
return err != nil
}, new(retry.None)).Invoke()
if err == nil {
fmt.Printf("%+v\n", response)
} else {
fmt.Printf("%+v\n", err)
}