Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceGoObject InterfaceList ObjectsListing Multi-Version Objects (Go SDK)
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Listing Multi-Version Objects (Go SDK)
Copy pageDownload PDFListing Multi-Version Objects (Go SDK)
This interface is used to list multi-version objects in a bucket. Each request returns a subset of multi-version objects from the bucket, with a maximum of 1,000 objects per request. Request parameters can be used as selection criteria to return a specific subset of objects within the bucket.
Precautions
Before listing multi-version objects, you must have the tos:ListBucketVersions permission. For specific instructions, refer to the IAM Policy Overview.
Parameter Description
Parameters | Description |
Parameters | Description |
Prefix | The prefix of the current query results. |
Delimiter | The character used to group object names. |
MaxKeys | Returns the maximum number of objects to be listed; the default value is 1000. Value range: greater than 0 and less than or equal to 1000. |
EncodingType | Encode the returned content and specify the encoding type. Default value: None |
KeyMarker | List the starting positions of multi-version objects. Configure the system to return a list of objects sorted alphabetically, starting after the specified value. This is typically the value of NextKeyMarker returned by the previous request. |
VersionIdMarker | Used in conjunction with KeyMarker, this sets the point after which a lexicographically sorted list of multi-version objects is returned. Obtain NextVersionIDMarker from the results of the previous listing. |
Sample Code
A brief enumeration
The following code is used to list up to 10 multi-version objects in the specified storage bucket.
package main
import (
"context"
"fmt"
"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 ***"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
output, err := client.ListObjectVersionsV2(ctx, &tos.ListObjectVersionsV2Input{
Bucket: bucketName,
ListObjectVersionsInput: tos.ListObjectVersionsInput{
MaxKeys: 10,
},
})
checkErr(err)
for _, obj := range output.Versions {
fmt.Println("Obj Key:", obj.Key)
fmt.Println("Obj Version ID:", obj.VersionID)
fmt.Println("Obj Last Modified:", obj.LastModified)
fmt.Println("Obj Is Latest Version:", obj.IsLatest)
}
for _, deleteMarker := range output.DeleteMarkers {
fmt.Println("Delete Maker Key:", deleteMarker.Key)
fmt.Println("Delete Maker Version ID:", deleteMarker.VersionID)
fmt.Println("Delete Maker Last Modified:", deleteMarker.LastModified)
fmt.Println("Delete Maker Is Latest Version:", deleteMarker.IsLatest)
}
}
List all objects with the specified prefix
The following code enumerates all multi-version objects and delete markers under the specified prefix in the designated bucket.
package main
import (
"context"
"fmt"
"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 ***"
prefix = "*** Provide your object key prefix ***"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
truncated := true
marker := ""
versionIdMarker := ""
for truncated {
output, err := client.ListObjectVersionsV2(ctx, &tos.ListObjectVersionsV2Input{
Bucket: bucketName,
ListObjectVersionsInput: tos.ListObjectVersionsInput{
MaxKeys: 10,
Prefix: prefix,
KeyMarker: marker,
VersionIDMarker: versionIdMarker,
},
})
checkErr(err)
for _, obj := range output.Versions {
fmt.Println("Obj Key:", obj.Key)
fmt.Println("Obj Version ID:", obj.VersionID)
fmt.Println("Obj Last Modified:", obj.LastModified)
fmt.Println("Obj Is Latest Version:", obj.IsLatest)
}
for _, deleteMarker := range output.DeleteMarkers {
fmt.Println("Delete Maker Key:", deleteMarker.Key)
fmt.Println("Delete Maker Version ID:", deleteMarker.VersionID)
fmt.Println("Delete Maker Last Modified:", deleteMarker.LastModified)
fmt.Println("Delete Maker Is Latest Version:", deleteMarker.IsLatest)
}
truncated = output.IsTruncated
marker = output.NextKeyMarker
versionIdMarker = output.NextVersionIDMarker
}
}
Enumerate all objects
The following code is used to enumerate all multi-version objects and delete markers within the specified bucket.
package main
import (
"context"
"fmt"
"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 ***"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
truncated := true
marker := ""
versionIdMarker := ""
for truncated {
output, err := client.ListObjectVersionsV2(ctx, &tos.ListObjectVersionsV2Input{
Bucket: bucketName,
ListObjectVersionsInput: tos.ListObjectVersionsInput{
MaxKeys: 1000,
KeyMarker: marker,
VersionIDMarker: versionIdMarker,
},
})
checkErr(err)
for _, obj := range output.Versions {
fmt.Println("Obj Key:", obj.Key)
fmt.Println("Obj Version ID:", obj.VersionID)
fmt.Println("Obj Last Modified:", obj.LastModified)
fmt.Println("Obj Is Latest Version:", obj.IsLatest)
}
for _, deleteMarker := range output.DeleteMarkers {
fmt.Println("Delete Maker Key:", deleteMarker.Key)
fmt.Println("Delete Maker Version ID:", deleteMarker.VersionID)
fmt.Println("Delete Maker Last Modified:", deleteMarker.LastModified)
fmt.Println("Delete Maker Is Latest Version:", deleteMarker.IsLatest)
}
truncated = output.IsTruncated
marker = output.NextKeyMarker
versionIdMarker = output.NextVersionIDMarker
}
}
Recursively enumerate objects and subdirectories within a directory
TOS defines only the concept of objects; it is possible to create an object with a size of zero and a name consisting of a slash (/)./The object at the end simulates the function of a directory.
The functionality of a directory can be simulated using the Delimiter and Prefix parameters:
- First, set the Delimiter to/At the same time, when Prefix is set to empty, objects and subdirectory information in the root directory can be returned.
- When setting Delimiter to/By simultaneously setting the Prefix to a subdirectory (subfiledir), objects and subdirectories of that subdirectory can be returned.
The following code recursively enumerates objects and subdirectories within a directory. For objects, information on all versions is returned; for directories, only the latest version information is provided.
package main
import (
"context"
"fmt"
"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 ***"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
truncated := true
marker := ""
versionIdMarker := ""
delimiter := "/"
for truncated {
output, err := client.ListObjectVersionsV2(ctx, &tos.ListObjectVersionsV2Input{
Bucket: bucketName,
ListObjectVersionsInput: tos.ListObjectVersionsInput{
MaxKeys: 1000,
KeyMarker: marker,
VersionIDMarker: versionIdMarker,
Delimiter: delimiter,
},
})
checkErr(err)
for _, prefix := range output.CommonPrefixes {
fmt.Println("Sub Dir:", prefix.Prefix)
}
for _, obj := range output.Versions {
fmt.Println("Obj Key:", obj.Key)
fmt.Println("Obj Version ID:", obj.VersionID)
fmt.Println("Obj Last Modified:", obj.LastModified)
fmt.Println("Obj Is Latest Version:", obj.IsLatest)
}
for _, deleteMarker := range output.DeleteMarkers {
fmt.Println("Delete Maker Key:", deleteMarker.Key)
fmt.Println("Delete Maker Version ID:", deleteMarker.VersionID)
fmt.Println("Delete Maker Last Modified:", deleteMarker.LastModified)
fmt.Println("Delete Maker Is Latest Version:", deleteMarker.IsLatest)
}
truncated = output.IsTruncated
marker = output.NextKeyMarker
versionIdMarker = output.NextVersionIDMarker
}
}
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Last updated: 2025.09.19 17:30:21
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