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Task #2951

Updated by bmbouter over 3 years ago

The way we offer concurrency in the plugin API is with the Batch() object which is built on code that we have to carry and maintain. Concurrent I/O (such as concurrent downloads) is a great fit for "asyncio":https://docs.python.org/3/library/asyncio.html and we should:

* Create a ConcurrentHTTPDownloader which is designed to be managed by an asyncio event loop created by the plugin writer. This writer
* Create a ConcurrentFTPDownloader which
is described some on designed to be managed by an asyncio event loop created by the wiki as the "ConcurrentDownloader":https://pulp.plan.io/projects/pulp/wiki/Pulp3_Plugin_Brainstorming. plugin writer
* Delete the Batch() object and it's supporting machinery. I think that is effectively everything in "batch.py":https://github.com/pulp/pulp/blob/3.0-dev/platform/pulpcore/download/batch.py
* Add a ContentUnitDownloader


One side-effect of this switch is that we may need
to switch from the download API, which is described "here":https://pulp.plan.io/projects/pulp/wiki/Pulp3_Plugin_Brainstorming as requests library to the Content Unit Downloader "aiohttp":http://aiohttp.readthedocs.io/en/stable/ library. Whatever we use needs to be "asyncio" aware. In other words it needs to support to co-routine pattern required by asyncio. This "SO post":https://stackoverflow.com/questions/22190403/how-could-i-use-requests-in-asyncio#22414756 claims that you *could* use requests if you wanted to.

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