Send data to asyncio coroutine

Marko Rauhamaa marko at
Sat Aug 1 21:14:54 CEST 2015

Javier <jcarmena at>:

> My intention now is to use the asyncio.StreamReader passed as argument
> to the asyncio.start_server callback to read objects serialized with
> pickle. The problems are that pickle cant read from it (because dont
> yield from the full stack) and that I don't know the exact length of
> each serialized object, so I can't extract data manually.
> Knows anybody the steps to follow?

You probably need to frame your pickled encoding. A simple thing would
be to use struct.pack/unpack to encode the length of the pickle encoding
in front of the pickle encoding. When decoding, you first read out the
length, then the pickle encoding, and finally you unpickle the payload.


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