Torch Object Storage
Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceHarmonyObject InterfaceUpload ObjectStandard Upload (Harmony SDK)
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Standard Upload (Harmony SDK)
Copy pageDownload PDFStandard Upload (Harmony SDK)
Standard upload refers to uploading a single object (Object) via the putObject method. It supports uploading strings (character streams), uploading bytes (byte streams), and uploading local files.
Precautions
- Before uploading an object, you must have the tos:PutObject permission.
- When uploading an object, the object name must comply with specific requirements. For more information, please refer to Object Naming Guidelines.
- TOS is a distributed object storage product designed for large-scale storage, with internal partitions that store object index data. To horizontally scale the maximum throughput for uploading and downloading objects and to reduce the probability of hot partitions, please avoid using lexicographically incremental object naming. For more information, see Performance Optimization.
- If an object with the same name already exists in the bucket, the new object will overwrite the existing one. If versioning is enabled for your bucket, the original object will be retained, and a new version number will be generated to identify the newly uploaded object.
Sample Code
Upload String
You can use the following sample code and the putObject API to upload string data to the example_dir directory's example.txt file in TOS.
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);
}
}
async function main() {
try {
const bucketName = 'harmony-sdk-test-bucket';
const objectName = 'example_dir/example.txt';
await client.putObject({
Bucket: bucketName,
Key: objectName,
Content: buffer.from('Hello TOS').buffer,
});
const res = await client.headObject({
Bucket: bucketName,
Key: objectName,
});
// object size: 9
console.log('object size:', res.ContentLength);
} catch (error) {
handleError(error);
}
}
main();
Upload Local File Stream
You can use the following example code and the putObject interface to upload a file from a specified path to example.txt in the example_dir directory of TOS.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
import fs from 'fs';
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);
}
}
async function main() {
try {
const bucketName = 'harmony-sdk-test-bucket';
const objectName = 'example_dir/example.txt';
const filePath = './example_dir/example.txt'
const uploadFromStream = new rcp.UploadFromStream(fs.createStreamSync(filePath, 'r+'))
await client.putObject({
Bucket: bucketName,
Key: objectName,
Content: uploadFromStream,
});
const res = await client.headObject({
Bucket: bucketName,
Key: objectName,
});
// object size: 9
console.log('object size:', res.ContentLength);
} catch (error) {
handleError(error);
}
}
main();
Upload from Local File
The following sample code demonstrates how to use the putObjectFromFile interface to upload a file by specifying its file path. The file will be uploaded to the specified example_dir directory in TOS as example.txt.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
import fs from 'fs';
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);
}
}
async function main() {
try {
const bucketName = 'harmony-sdk-test-bucket';
const objectName = 'example_dir/example.txt';
await client.putObjectFromFile({
Bucket: bucketName,
Key: objectName,
FilePath: './example.txt',
});
const res = await client.headObject({
Bucket: bucketName,
Key: objectName,
});
// object size: 9
console.log('object size:', res.ContentLength);
} catch (error) {
handleError(error);
}
}
main();
Configuring object metadata during upload
You can use the following sample code to upload string data to the example.txt file under the example_dir directory using the putObject interface. During the upload, specify the object storage type as infrequent access, set the access permission to private, and configure the file metadata.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
import fs from 'fs';
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);
}
}
async function main() {
const meta: Record<string, string> = {};
meta.key = 'value'
try {
const bucketName = 'harmony-sdk-test-bucket';
const objectName = 'example_dir/example.txt';
await client.putObject({
Bucket: bucketName,
Key: objectName,
Content: buffer.from('Hello TOS').buffer,
StorageClass: StorageClassType.StorageClassIa,
ACL: ACLType.ACLPrivate,
Meta: meta,
});
const res = await client.headObject({
Bucket: bucketName,
Key: objectName,
});
console.log('object size:', res.ContentLength);
console.log('storage class:', res.StorageClass);
console.log('x-tos-meta-key:', res.Meta?.['key']);
} catch (error) {
handleError(error);
}
}
Relevant Documentation
Last updated: 2025.09.26 19:05:14
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