Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceGoObject InterfaceList ObjectsListing Objects (Go SDK)
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Listing Objects (Go SDK)
Copy pageDownload PDFListing Objects (Go SDK)
This article describes how to use ListObjects to enumerate all objects within a specified bucket, files with a specified prefix, as well as files and subdirectories within a specified directory.
Precautions
- The ListObjects interface has been updated to ListObjectsType2. It is strongly recommended that developers use ListObjectsType2. To ensure backward compatibility, TOS continues to support the ListObjects interface.
- To use the object listing feature, you must have the tos:ListBucket 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 | Character used to group object names. |
Marker | Specify the starting position of the object. Return a list of objects sorted alphabetically, starting after the specified value. This is typically the NextMarker value returned by the previous request. |
MaxKeys | Returns the maximum number of enumerated objects. 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 type of encoding. Default value: None |
Sample Code
Brief Enumeration
The following code enumerates 10 objects in 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)
output, err := client.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 10,
},
})
checkErr(err)
for _, obj := range output.Contents {
fmt.Println("Object Key:", obj.Key)
fmt.Println("Object LastModified:", obj.LastModified)
fmt.Println("Object ETag:", obj.ETag)
fmt.Println("Object Size:", obj.Size)
fmt.Println("Object Owner:", obj.Owner)
fmt.Println("Object StorageClass:", obj.StorageClass)
fmt.Println("Object HashCrc64ecma:", obj.HashCrc64ecma)
}
}
Paginated Listing
The following code is used to list objects in the specified bucket with pagination.
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 printObjectContent(contents []tos.ListedObjectV2) {
for _, obj := range contents {
fmt.Println("Object Key:", obj.Key)
fmt.Println("Object LastModified:", obj.LastModified)
fmt.Println("Object ETag:", obj.ETag)
fmt.Println("Object Size:", obj.Size)
fmt.Println("Object Owner:", obj.Owner)
fmt.Println("Object StorageClass:", obj.StorageClass)
fmt.Println("Object HashCrc64ecma:", obj.HashCrc64ecma)
}
}
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.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 1000,
},
})
checkErr(err)
printObjectContent(output.Contents)
output, err = client.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 1000,
Marker: output.NextMarker,
},
})
checkErr(err)
printObjectContent(output.Contents)
}
List all objects with the specified prefix
The following code is used to enumerate all objects in the bucket with the specified prefix.
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 := ""
for truncated {
output, err := client.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 1000,
Prefix: prefix,
Marker: marker,
},
})
checkErr(err)
for _, obj := range output.Contents {
fmt.Println("Object Key:", obj.Key)
fmt.Println("Object LastModified:", obj.LastModified)
fmt.Println("Object ETag:", obj.ETag)
fmt.Println("Object Size:", obj.Size)
fmt.Println("Object Owner:", obj.Owner)
fmt.Println("Object StorageClass:", obj.StorageClass)
fmt.Println("Object HashCrc64ecma:", obj.HashCrc64ecma)
}
truncated = output.IsTruncated
marker = output.NextMarker
}
}
List all objects in the bucket
The following code enumerates all objects 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 := ""
for truncated {
output, err := client.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 1000,
Marker: marker,
},
})
checkErr(err)
for _, obj := range output.Contents {
fmt.Println("Object Key:", obj.Key)
fmt.Println("Object LastModified:", obj.LastModified)
fmt.Println("Object ETag:", obj.ETag)
fmt.Println("Object Size:", obj.Size)
fmt.Println("Object Owner:", obj.Owner)
fmt.Println("Object StorageClass:", obj.StorageClass)
fmt.Println("Object HashCrc64ecma:", obj.HashCrc64ecma)
}
truncated = output.IsTruncated
marker = output.NextMarker
}
}
List files and subdirectories in the specified directory
TOS supports only the concept of objects; it is possible to create an object with a size of zero and a slash in its name./The object at the end simulates the functionality of a directory.
By using the Delimiter and Prefix parameters, you can simulate directory functionality:
- First, set Delimiter to/By simultaneously setting Prefix to empty, information about objects and subdirectories in the root directory can be returned.
- When setting the Delimiter to/When Prefix is simultaneously set to a subdirectory (subfiledir), objects and subdirectories within that subdirectory can be returned.
The following code is used to enumerate objects and subdirectories within a specified directory of a 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)
truncated := true
marker := ""
for truncated {
output, err := client.ListObjectsV2(ctx, &tos.ListObjectsV2Input{
Bucket: bucketName,
ListObjectsInput: tos.ListObjectsInput{
MaxKeys: 1000,
Delimiter: "/",
Marker: marker,
},
})
checkErr(err)
for _, prefix := range output.CommonPrefixes {
fmt.Println("Sub Dir:", prefix.Prefix)
}
for _, obj := range output.Contents {
fmt.Println("Obj:", obj.Key)
}
truncated = output.IsTruncated
marker = output.NextMarker
}
}
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Last updated: 2025.09.19 17:30:21
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