Pickled objects over the network

Jean-Paul Calderone exarkun at divmod.com
Fri Jul 20 17:55:36 CEST 2007


On Fri, 20 Jul 2007 08:27:13 -0700, Walker Lindley <brotherjenos at gmail.com> wrote:
>It doesn't interface well because the string you end up with often doesn't
>fit into a single packet. Therefore you have to add a layer of protocol on
>top of it that allows you to check to make sure you have the whole string
>received before trying to unpickle it. This the case even if you use
>socket's makefile() method to make a file descriptor.

This is somewhat misleading. TCP doesn't guarantee any minimum packet size
larger than a single byte.  Any messaging system which uses strings longer
than one byte must have a framing protocol to be reliable.  So, this isn't
really specific to pickle.  Basically, all protocols have to address this.

Jean-Paul



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