I am trying to use IBM Cloud Object Storage to store images uploaded to my site by users. I have this functionality working just fine.
However, based on the documentation here (link) it appears as though only one object can be downloaded from a bucket at a time.
Is there any way a list of objects could all be downloaded from the bucket? Is there a different approach to requesting multiple objects from a COS bucket?
Via the REST API, no, you can only download a single object at a time. But most tools (like the AWS CLI, or Minio Client) allow downloading all objects that share a prefix (eg foo/bar and foo/bas). The IBM forks of the S3 libraries also are now integrated with Aspera, and can transfer large directories all at once. What are you trying to do?
According to S3 spec (https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectGET.html), you can only download one object at a time.
There are various tools which may help to download multiple objects at a time from COS. I used AWS CLI tool to download and upload the objects from/to COS.
So install aws-cli tool and configure it by supplying access_key_id and secret_access_key here.
Recursively copying S3 objects to a local directory: When passed with the parameter --recursive, the following cp command recursively copies all objects under a specified prefix and bucket to a specified directory.
C:\Users\Shashank>aws s3 cp s3://yourBucketName . --recursive
for example:
C:\Users\Shashank>aws --endpoint-url http://s3.us-east.cloud-object-storage.appdomain.cloud s3 cp s3://yourBucketName D:\s3\ --recursive
In my case having endpoint based on us-east region and I am copying objects into D:\s3 directory.
Recursively copying local files to S3: When passed with the parameter --recursive, the following cp command recursively copies all files under a specified directory to a specified bucket.
C:\Users\Shashank>aws s3 cp myDir s3://yourBucketName/ --recursive
for example:
C:\Users\Shashank>aws --endpoint-url http://s3.us-east.cloud-object-storage.appdomain.cloud s3 cp D:\s3 s3://yourBucketName/ --recursive
I am copying objects from D:\s3 directory to COS.
For more reference, you can see the link here.
I hope it works for you.
