Object Storage Service:Manage symbolic links using OSS SDK for Go 2.0

Below is a code example for creating a symbolic link that points to the current version of an object.

package main

import (
	"context"
	"flag"
	"log"

	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
)

// Define global variables.
var (
	region     string // Region in which the bucket is located.
	bucketName string // Name of the bucket.
	objectName string // Name of the object.
)

// Specify the init function used to initialize command line parameters.
func init() {
	flag.StringVar(&region, "region", "", "The region in which the bucket is located.")
	flag.StringVar(&bucketName, "bucket", "", "The name of the bucket.")
	flag.StringVar(&objectName, "object", "", "The name of the object.")
}

func main() {
	// Parse command line parameters.
	flag.Parse()

	// Specify the name of the symbolic link.
	var (
		symlinkName = "testsymlink" // Name of the symbolic link.
	)

	// Check whether the region is specified.
	if len(region) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, region required")
	}

	// Check whether the name of the bucket is specified.
	if len(bucketName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, bucket name required")
	}

	// Check whether the name of the object is specified.
	if len(objectName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, object name required")
	}

	// Check whether the name of the symbolic link is specified.
	if len(symlinkName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, symlink name required")
	}

	// Load the default configurations and specify the credential provider and region.
	cfg := oss.LoadDefaultConfig().
		WithCredentialsProvider(credentials.NewEnvironmentVariableCredentialsProvider()).
		WithRegion(region)

	// Create an OSS client.
	client := oss.NewClient(cfg)

	// Create a request for symbolic link creation.
	putRequest := &oss.PutSymlinkRequest{
		Bucket: oss.Ptr(bucketName),  // Name of the bucket.
		Key:    oss.Ptr(symlinkName), // Name of the symbolic link.
		Target: oss.Ptr(objectName),  // Name of the target object.
	}

	// Execute the request.
	putResult, err := client.PutSymlink(context.TODO(), putRequest)
	if err != nil {
		log.Fatalf("failed to put symlink %v", err)
	}

	// Display the result.
	log.Printf("put symlink result:%#v\n", putResult)
}

Below is a code example for querying a symbolic link.

package main

import (
	"context"
	"flag"
	"log"

	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
)

// Define global variables.
var (
	region      string // Region in which the bucket is located.
	bucketName  string // Name of the bucket.
	symlinkName string // Name of the symbolic link.
)

// Specify the init function used to initialize command line parameters.
func init() {
	flag.StringVar(&region, "region", "", "The region in which the bucket is located.")
	flag.StringVar(&bucketName, "bucket", "", "The name of the bucket.")
	flag.StringVar(&symlinkName, "symlink", "", "The name of the symlink.")
}

func main() {
	// Parse command line parameters.
	flag.Parse()

	// Check whether the region is specified.
	if len(region) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, region required")
	}

	// Check whether the name of the bucket is specified.
	if len(bucketName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, bucket name required")
	}

	// Check whether the name of the symbolic link is specified.
	if len(symlinkName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, symlink name required")
	}

	// Load the default configurations and specify the credential provider and region.
	cfg := oss.LoadDefaultConfig().
		WithCredentialsProvider(credentials.NewEnvironmentVariableCredentialsProvider()).
		WithRegion(region)

	// Create an OSS client.
	client := oss.NewClient(cfg)

	// Create a query request for the symbolic link.
	getRequest := &oss.GetSymlinkRequest{
		Bucket:    oss.Ptr(bucketName),  // Name of the bucket.
		Key:       oss.Ptr(symlinkName), // Name of the symbolic link.
		VersionId: oss.Ptr("versionId"), // Specify the actual version ID.
	}

	// Execute the query operation and process the result.
	getResult, err := client.GetSymlink(context.TODO(), getRequest)
	if err != nil {
		log.Fatalf("failed to get symlink %v", err)
	}

	// Display the name of the target object to which the symbolic link points.
	log.Printf("get symlink target object name:%#v\n", *getResult.Target)
}