Object Storage Service:Adicionar tags a objetos usando o OSS SDK for Go 2.0

O código a seguir mostra como adicionar tags ao fazer upload do objeto.

package main

import (
	"context"
	"flag"
	"log"
	"strings"

	"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()

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

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

	// Specify the content that you want to upload.
	content := "hi oss"

	// 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 to upload the object.
	request := &oss.PutObjectRequest{
		Bucket:  oss.Ptr(bucketName),                // Name of the bucket.
		Key:     oss.Ptr(objectName),                // Name of the object.
		Body:    strings.NewReader(content),         // Content to upload.
		Tagging: oss.Ptr("tag1=value1&tag2=value2"), // Specify the tags of the object.
	}

	// Execute the request.
	result, err := client.PutObject(context.TODO(), request)
	if err != nil {
		log.Fatalf("failed to put object %v", err)
	}

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

O código a seguir mostra como adicionar tags ao fazer upload multipart.

package main

import (
	"bufio"
	"bytes"
	"context"
	"flag"
	"io"
	"log"
	"os"
	"sync"

	"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 source bucket.
	objectName string // Name of the source 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 source bucket.")
	flag.StringVar(&objectName, "object", "", "The name of the source object.")
}

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

	// Specify the upload ID.
	var uploadId string

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

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

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

	// Initialize the multipart upload request.
	initRequest := &oss.InitiateMultipartUploadRequest{
		Bucket:  oss.Ptr(bucketName),
		Key:     oss.Ptr(objectName),
		Tagging: oss.Ptr("tag1=value1&tag2=value2"), // Specify the tags of the object.
	}

	// Execute the request to initiate the multipart upload task.
	initResult, err := client.InitiateMultipartUpload(context.TODO(), initRequest)
	if err != nil {
		log.Fatalf("failed to initiate multipart upload %v", err)
	}

	// Display the result of initialisation.
	log.Printf("initiate multipart upload result:%#v\n", *initResult.UploadId)
	uploadId = *initResult.UploadId

	// Initialize the wait group and mutex.
	var wg sync.WaitGroup
	var parts []oss.UploadPart
	count := 3
	var mu sync.Mutex

	// Read data from the local file to the memory and replace yourLocalFile with the actual path of the local file that contains the file name.
	file, err := os.Open("/Users/leyinhui/Downloads/iTerm2")
	if err != nil {
		log.Fatalf("failed to open local file %v", err)
	}
	defer file.Close()

	bufReader := bufio.NewReader(file)
	content, err := io.ReadAll(bufReader)
	if err != nil {
		log.Fatalf("failed to read local file %v", err)
	}
	log.Printf("file size: %d\n", len(content))

	// Calculate the size of each part.
	chunkSize := len(content) / count
	if chunkSize == 0 {
		chunkSize = 1
	}

	// Start multiple goroutines for the multipart upload task.
	for i := 0; i < count; i++ {
		start := i * chunkSize
		end := start + chunkSize
		if i == count-1 {
			end = len(content)
		}

		wg.Add(1)
		go func(partNumber int, start, end int) {
			defer wg.Done()

			// Create the multipart upload request.
			partRequest := &oss.UploadPartRequest{
				Bucket:     oss.Ptr(bucketName),                 // Name of the destination bucket.
				Key:        oss.Ptr(objectName),                 // Name of the destination object.
				PartNumber: int32(partNumber),                   // Number of the part.
				UploadId:   oss.Ptr(uploadId),                   // Upload ID.
				Body:       bytes.NewReader(content[start:end]), // Content of the part.
			}

			// Send the request to upload the part.
			partResult, err := client.UploadPart(context.TODO(), partRequest)
			if err != nil {
				log.Fatalf("failed to upload part %d: %v", partNumber, err)
			}

			// Display the result of the request.
			part := oss.UploadPart{
				PartNumber: partRequest.PartNumber,
				ETag:       partResult.ETag,
			}

			// Use the mutex to protect shared data.
			mu.Lock()
			parts = append(parts, part)
			mu.Unlock()
		}(i+1, start, end)
	}

	// Wait until all goroutines are complete.
	wg.Wait()

	// Complete the multipart upload task.
	request := &oss.CompleteMultipartUploadRequest{
		Bucket:   oss.Ptr(bucketName),
		Key:      oss.Ptr(objectName),
		UploadId: oss.Ptr(uploadId),
		CompleteMultipartUpload: &oss.CompleteMultipartUpload{
			Parts: parts,
		},
	}
	result, err := client.CompleteMultipartUpload(context.TODO(), request)
	if err != nil {
		log.Fatalf("failed to complete multipart upload %v", err)
	}

	// Display the results.
	log.Printf("complete multipart upload result:%#v\n", result)
}

O código a seguir mostra como adicionar tags ao fazer upload de append.

package main

import (
	"context"
	"flag"
	"log"
	"strings"

	"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
	bucketName string
	objectName string
)

// 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 position from which the append operation starts.
	var (
		position = int64(0)
	)

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

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

	// Specify the content that you want to append.
	content := "hi append object"

	// Create an AppendObject request to perform the first append operation.
	request := &oss.AppendObjectRequest{
		Bucket:   oss.Ptr(bucketName),
		Key:      oss.Ptr(objectName),
		Position: oss.Ptr(position),
		Body:     strings.NewReader(content),
		Tagging:  oss.Ptr("tag1=value1&tag2=value2"), // Specify the tags of the object.
	}

	// Perform the first append operation and process the results.
	// The first time an object is appended, the append operation starts at 0. The position for the next append operation is included in the response.
	result, err := client.AppendObject(context.TODO(), request)
	if err != nil {
		log.Fatalf("failed to append object %v", err)
	}

	// Create an AppendObject request to perform the second append operation.
	request = &oss.AppendObjectRequest{
		Bucket:   oss.Ptr(bucketName),
		Key:      oss.Ptr(objectName),
		Position: oss.Ptr(result.NextPosition), // Obtain NextPosition from the return value of the first AppendObject
		Body:     strings.NewReader("hi append object"),
	}

	// Perform the second append operation and process the results.
	result, err = client.AppendObject(context.TODO(), request)
	if err != nil {
		log.Fatalf("failed to append object %v", err)
	}

	log.Printf("append object result:%#v\n", result)
}

O código a seguir mostra como adicionar tags ao copiar um objeto.

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.
	srcBucketName  string // Name of the source bucket.
	srcObjectName  string // Name of the source object.
	destBucketName string // Name of the destination bucket.
	destObjectName string // Name of the destination 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(&srcBucketName, "src-bucket", "", "The name of the source bucket.")
	flag.StringVar(&srcObjectName, "src-object", "", "The name of the source object.")
	flag.StringVar(&destBucketName, "dest-bucket", "", "The name of the destination bucket.")
	flag.StringVar(&destObjectName, "dest-object", "", "The name of the destination object.")
}

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

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

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

	// If the destination bucket name is not specified, the source bucket name is used.
	if len(destBucketName) == 0 {
		destBucketName = srcBucketName
	}

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

	// Check whether the name of the destination object is specified.
	if len(destObjectName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, destination object 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 to copy the object.
	copyRequest := &oss.CopyObjectRequest{
		Bucket:           oss.Ptr(destBucketName),            // Name of the destination bucket.
		Key:              oss.Ptr(destObjectName),            // Name of the destination object.
		SourceKey:        oss.Ptr(srcObjectName),             // Name of the source object.
		SourceBucket:     oss.Ptr(srcBucketName),             // Name of the source bucket.
		StorageClass:     oss.StorageClassStandard,           // Set the storage class to Standard.
		TaggingDirective: oss.Ptr("Replace"),                 // Ignore the tags of the source object.
		Tagging:          oss.Ptr("tag1=value1&tag2=value2"), // Specify the tags of the object.
	}

	// Copy the source object and process the results.
	copyResult, err := client.CopyObject(context.TODO(), copyRequest)
	if err != nil {
		log.Fatalf("failed to copy object: %v", err)
	}

	// Display the results.
	log.Printf("copy object result:%#v\n", copyResult)

}

Se um objeto existente não tiver tags ou se as tags adicionadas não atenderem aos seus requisitos, adicione novas tags ou modifique as existentes.

O código a seguir mostra como adicionar ou modificar as tags de um objeto existente.

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()

	// 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")
	}

	// 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 to add tags.
	putRequest := &oss.PutObjectTaggingRequest{
		Bucket: oss.Ptr(bucketName), // Name of the bucket.
		Key:    oss.Ptr(objectName), // Name of the object.
		Tagging: &oss.Tagging{
			TagSet: &oss.TagSet{
				Tags: []oss.Tag{
					{
						Key:   oss.Ptr("k1"), // Tag key.
						Value: oss.Ptr("v1"), // Tag value.
					},
					{
						Key:   oss.Ptr("k2"), // Tag key.
						Value: oss.Ptr("v2"), // Tag value.
					},
				},
			},
		},
	}

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

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