Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceHarmonyIntroduction to Typical ScenariosDirectory Scenario (Harmony SDK)
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Download PDFIntroduction to Typical Scenarios
Directory Scenario (Harmony SDK)
Copy pageDownload PDFDirectory Scenario (Harmony SDK)
In TOS, only the concept of objects is defined, and data is stored internally using a flat structure. To facilitate object grouping and simplify permission management, you can organize objects using a directory hierarchy.
Create Directory
The following code is used to create the directory 'exampledir'.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
const bucketName = 'harmonyos-sdk-test-bucket';
async function main() {
try {
const key = 'exampledir/';
const res = await client.putObject({
Bucket: bucketName,
Key: key,
});
console.log('putObject Request ID: ', res.RequestId);
const key2 = 'exampledir/test/';
const res2 = await client.putObject({
Bucket: bucketName,
Key: key2,
});
console.log('putObject Request ID: ', res2.RequestId);
} catch (error) {
handleError(error);
}
}
main();
Simulated Directory Query
TOS only has the concept of objects; it is possible to create an object with a size of zero and a trailing slash./The object at the end simulates the functionality of a directory.
The functionality of a directory can be simulated using the delimiter and prefix parameters:
- First, set delimiter to/By also setting prefix to empty, you can return objects and subdirectory information in the root directory.
- When setting the delimiter to/By setting prefix to a subdirectory (subfiledir), objects within the subdirectory and its subordinate directories can be returned.
The following code is used to enumerate objects and subdirectories in the root directory.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
function printObjectContents(contents: ListedObject[]) {
console.log('Contents Length:', contents.length);
for (const obj of contents) {
console.log('Object Key:', obj.Key);
console.log('Object LastModified:', obj.LastModified);
console.log('Object ETag:', obj.ETag);
console.log('Object Size:', obj.Size);
console.log('Object Owner:', obj.Owner);
console.log('Object StorageClass:', obj.StorageClass);
console.log('Object HashCrc64ecma:', obj.HashCrc64ecma);
}
}
const bucketName = 'harmonyos-sdk-test-bucket';
async function main() {
try {
let continuationToken = '';
while (true) {
const res = await client.listObjectsType2({
Bucket: bucketName,
MaxKeys: 1000,
ContinuationToken: continuationToken,
Delimiter: '/',
});
console.log('Sub Dir Length:', res.CommonPrefixes.length);
for (const prefix of res.CommonPrefixes) {
console.log('Sub Dir:', prefix.Prefix);
}
if (!res.NextContinuationToken) {
break
}
continuationToken = res.NextContinuationToken;
}
} catch (error) {
handleError(error);
}
}
main();
Delete files in the directory.
The following code is used to delete all files located in the exampledir/ directory within the storage bucket.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
function printObjectContents(contents: ListedObject[]) {
console.log('Contents Length:', contents.length);
for (const obj of contents) {
console.log('Object Key:', obj.Key);
console.log('Object LastModified:', obj.LastModified);
console.log('Object ETag:', obj.ETag);
console.log('Object Size:', obj.Size);
console.log('Object Owner:', obj.Owner);
console.log('Object StorageClass:', obj.StorageClass);
console.log('Object HashCrc64ecma:', obj.HashCrc64ecma);
}
}
const bucketName = 'harmonyos-sdk-test-bucket';
async function main() {
try {
const dir = 'exampledir/';
let continuationToken = '';
while (true) {
const res = await client.listObjectsType2({
Bucket: bucketName,
MaxKeys: 1000,
ContinuationToken: continuationToken,
Prefix: dir,
});
for (const obj of res.Contents) {
const res = await client.deleteObject({
Bucket: bucketName,
Key: obj.Key,
});
console.log('deleteObject %s Request ID:', obj.Key, res.RequestId);
}
if (!res.IsTruncated || !res.NextContinuationToken) {
break;
}
continuationToken = res.NextContinuationToken;
}
} catch (error) {
handleError(error);
}
}
main();
Last updated: 2025.09.26 19:05:17
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