Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceGoObject InterfaceManage ObjectsProhibit Overwriting Files with Identical Names (Go SDK)
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Download PDFManage Objects
Prohibit Overwriting Files with Identical Names (Go SDK)
Copy pageDownload PDFProhibit Overwriting Files with Identical Names (Go SDK)
This article describes how to prevent overwriting files with identical names during upload, copy, and multipart upload operations in the Go SDK by setting the x-tos-forbid-overwrite request header.
Simple Upload
The following code is used to prevent overwriting files with identical names during simple upload:
package main
import (
"context"
"fmt"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
"os"
"strings"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "*** Provide your object key ***"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
body := strings.NewReader("Hello TOS")
output, err := client.PutObjectV2(ctx, &tos.PutObjectV2Input{
PutObjectBasicInput: tos.PutObjectBasicInput{
Bucket: bucketName,
Key: objectKey,
ForbidOverwrite: true,
},
Content: body,
})
checkErr(err)
fmt.Println("PutObjectV2 Request ID:", output.RequestID)
}
Copying Files
The following code is used to prevent overwriting files with identical names during file copying:
package main
import (
"context"
"fmt"
"os"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
srcObjectKey = "srcObjectKey"
dstObjectKey = "objectKey"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
output, err := client.CopyObject(ctx, &tos.CopyObjectInput{
Bucket: bucketName,
Key: dstObjectKey,
SrcBucket: bucketName,
SrcKey: srcObjectKey,
ForbidOverwrite: true,
})
checkErr(err)
fmt.Println("CopyObject Request ID:", output.RequestID)
}
Multipart Upload
The following code is used to prevent overwriting files with identical names during chunked upload:
package main
import (
"context"
"fmt"
"io"
"os"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "*** Provide your object name ***"
ctx = context.Background()
)
localFile := "/root/example.txt"
fd, err := os.Open(localFile)
checkErr(err)
defer fd.Close()
stat, err := os.Stat(localFile)
checkErr(err)
fileSize := stat.Size()
partNumber := 1
partSize := int64(20 * 1024 * 1024)
offset := int64(0)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
createMultipartOutput, err := client.CreateMultipartUploadV2(ctx, &tos.CreateMultipartUploadV2Input{
Bucket: bucketName,
Key: objectKey,
ForbidOverwrite: true,
})
checkErr(err)
fmt.Println("CreateMultipartUploadV2 Request ID:", createMultipartOutput.RequestID)
fmt.Println("CreateMultipartUploadV2 Upload ID:", createMultipartOutput.UploadID)
var parts []tos.UploadedPartV2
for offset < fileSize {
uploadSize := partSize
if fileSize-offset < partSize {
uploadSize = fileSize - offset
}
fd.Seek(offset, io.SeekStart)
partOutput, err := client.UploadPartV2(ctx, &tos.UploadPartV2Input{
UploadPartBasicInput: tos.UploadPartBasicInput{
Bucket: bucketName,
Key: objectKey,
UploadID: createMultipartOutput.UploadID,
PartNumber: partNumber,
},
Content: io.LimitReader(fd, uploadSize),
ContentLength: uploadSize,
})
checkErr(err)
fmt.Println("upload Request ID:", partOutput.RequestID)
parts = append(parts, tos.UploadedPartV2{PartNumber: partNumber, ETag: partOutput.ETag})
offset += uploadSize
partNumber++
}
completeOutput, err := client.CompleteMultipartUploadV2(ctx, &tos.CompleteMultipartUploadV2Input{
Bucket: bucketName,
Key: objectKey,
UploadID: createMultipartOutput.UploadID,
Parts: parts,
ForbidOverwrite: true,
})
checkErr(err)
fmt.Println("CompleteMultipartUploadV2 Request ID:", completeOutput.RequestID)
}
Last updated: 2025.09.19 17:30:21
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