[issue32251] Add asyncio.BufferedProtocol

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

>> Looks nice.  Can it speed up aiohttp too?

> Yes.
> aiohttp uses own streams but public API and internal implementation are pretty close to asyncio streams.
> Moreover C accelerated HTTP parser should work with proposed BufferedProtocol seamlessly.

I did some benchmarks, and it looks like BufferedProtocol can make httptools up to 5% faster for relatively small requests < 10Kb.  Don't expect big speedups there.

For asyncpg, benchmarks that fetch a lot of data (50-100Kb) get faster up to 15%.  So we'll definitely use the BufferedProtocol in asyncpg.

For applications that need to handle megabytes of data per request (like Antoine's benchmark) the speedup will be up to 2x.

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<https://bugs.python.org/issue32251>
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