[dev] [jira] [Created] (LIBCLOUD-275) Utility APIs for containers

["Mahendra M (JIRA)" <ji...@apache.org>]

Mahendra M created LIBCLOUD-275:
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             Summary: Utility APIs for containers
                 Key: LIBCLOUD-275
                 URL: https://issues.apache.org/jira/browse/LIBCLOUD-275
             Project: Libcloud
          Issue Type: New Feature
          Components: Storage
            Reporter: Mahendra M
            Assignee: Mahendra M
            Priority: Minor


While working with libcloud, I thought it will be good to have some utility APIs to containers, which will help in easier use. Some APIs will have a base class implementation, which can be easily over-written in each driver based on the storage provider.

Some APIs that I have in mind are:
1. container.copy_object(obj, target_container)
Copies an object from one container to another. Base class implementation can be
   target_container.upload_object_via_stream(container.download_object_as_stream(obj), obj.name)
In each driver, this can be over-written to use specific methods to do this (AWS, Azure etc. provide APIs for doing this).

2. container.move_object(obj, target_container)
 Base class implementation can be:
   container.copy_object(obj, target_container)
   obj.delete()
 Again, driver specific extensions can be done.

3. container.sync_to_local(local_path, only_missing=True, only_newer=False)
4. container.sync_from_local(local_path, followlinks=False, prefix='', only_missing=True, only_newer=False)
The above two functions are good for syncing local folder repos with cloud. The functions are ridiculously easy to implement and will provide good mechanism for sync. (For eg: syncing a folder which contains 500 HLS chunks of a video)

The parameters used are:
* only_missing - sync only files that missing in the target (container or folder)
* only_newer - sync only files that have last-modified (or m_time) more than the target
* prefix - A prefix to be prefixed to each object name while syncing from a local folder.

I am just opening a ticket so that we can discuss this and finalize it. Once everyone agree, I can submit/check-in a patch

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