Storage Class

OBS allows you to set storage classes for buckets. The storage class of an object defaults to be that of its residing bucket. Different storage classes meet different needs for storage performance and costs. There are three types of storage class for buckets, as described in the following table:

Storage Class	Description	Value in OBS BrowserJS SDK
OBS Standard	Features low access latency and high throughput and is applicable to storing frequently-accessed (multiple times per month) hotspot or small objects (< 1 MB) requiring quick response.	ObsClient.enums.StorageClassStandard
OBS Warm	Is applicable to storing semi-frequently accessed (less than 12 times a year) data requiring quick response.	ObsClient.enums.StorageClassWarm
OBS Cold	Is applicable to archiving rarely-accessed (once a year) data.	ObsClient.enums.StorageClassCold
Intelligent Tiering	Is designed to optimize storage costs by automatically moving data to a more economical access tier when data access patterns change. This storage class is ideal for data with constantly changing or unpredictable access patterns.	ObsClient.enums.StorageClassINTELLIGENTTIERING

Setting the Storage Class for a Bucket

You can call ObsClient.setBucketStoragePolicy to set the storage class for a bucket. Sample code is as follows:

// Create an instance of ObsClient.
var obsClient = new ObsClient({
    // Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
    // The front-end code does not have the process environment variable, so you need to use a module bundler like webpack to define the process variable.
    // Obtain an AK/SK pair on the management console.
    access_key_id: process.env.AccessKeyID,
    secret_access_key: process.env.SecretAccessKey,
    server: 'https://your-endpoint'
});

obsClient.setBucketStoragePolicy({
       Bucket: 'bucketname',
       StorageClass: obsClient.enums.StorageClassWarm
}, function (err, result) {
       if(err){
              console.error('Error-->' + err);
       }else{
              console.log('Status-->' + result.CommonMsg.Status);
       }
});

Use the StorageClass parameter to set the storage class for a bucket.

Obtaining the Storage Class of a Bucket

You can call ObsClient.getBucketStoragePolicy to obtain the storage class of a bucket. Sample code is as follows:

// Create an instance of ObsClient.
var obsClient = new ObsClient({
    // Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
    // The front-end code does not have the process environment variable, so you need to use a module bundler like webpack to define the process variable.
    // Obtain an AK/SK pair on the management console.
    access_key_id: process.env.AccessKeyID,
    secret_access_key: process.env.SecretAccessKey,
    server: 'https://your-endpoint'
});

obsClient.getBucketStoragePolicy({
       Bucket: 'bucketname'
}, function (err, result) {
       if(err){
              console.error('Error-->' + err);
       }else{
              console.log('Status-->' + result.CommonMsg.Status);
              if(result.CommonMsg.Status < 300 && result.InterfaceResult){
                     console.log('StorageClass-->' + result.InterfaceResult.StorageClass);
              }
       }
});