Object Storage Service:Use object tagging for lifecycle management

The following sample code provides an example on how to specify tags in a lifecycle rule:

package main

import (
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func main() {
	// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
	provider, err := oss.NewEnvironmentVariableCredentialsProvider()
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}
	// Create an OSSClient instance. 
	// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
	client, err := oss.New("yourEndpoint", "", "", oss.SetCredentialsProvider(&provider))
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}

	// Configure a lifecycle rule whose ID is rule1. This lifecyle rule applies to objects whose names contain the "one" prefix. 
	// The lifecycle rule moves objects whose names contain the "one" prefix to the IA storage class 3 days after the last modified time and then to the Archive storage class 30 days after the last modified time. 
	transitionIA := oss.LifecycleTransition{
		Days:         3,
		StorageClass: oss.StorageIA,
	}
	transitionArch := oss.LifecycleTransition{
		Days:         30,
		StorageClass: oss.StorageArchive,
	}

	// Configure tags. 
	tag1 := oss.Tag{
		Key:   "key1",
		Value: "value1",
	}
	tag2 := oss.Tag{
		Key:   "key2",
		Value: "value2",
	}

	// Configure a lifecycle rule for the bucket. The lifecycle rule contains the configured tags. 
	rule1 := oss.LifecycleRule{
		ID:          "rule1",
		Prefix:      "one",
		Status:      "Enabled",
		Transitions: []oss.LifecycleTransition{transitionIA, transitionArch},
		Tags:        []oss.Tag{tag1, tag2},
	}
	rules := []oss.LifecycleRule{rule1}
	err = client.SetBucketLifecycle("yourBucketName", rules)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}
}

The following code provides an example on how to query tags configured in a lifecycle rule:

package main

import (
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func main() {
	// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
	provider, err := oss.NewEnvironmentVariableCredentialsProvider()
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}
	// Create an OSSClient instance. 
	// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
	client, err := oss.New("yourEndpoint", "", "", oss.SetCredentialsProvider(&provider))
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}

	// Query the lifecycle rule that is configured for the bucket. 
	// Specify the name of the bucket. 
	lc, err := client.GetBucketLifecycle("yourBucketName")
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}

	// Display the lifecycle rule information, which includes tag information. 
	for i, v := range lc.Rules {
		fmt.Printf("Bucket %d Lifecycle: %v", i, v)
		if v.Expiration != nil {
			fmt.Printf(", Expiration:%v", *v.Expiration)
		}
		fmt.Printf("\n")
	}
}