Re: CADET: obtaining the channel closure

Christian Grothoff <[email protected]> Sun, 28 Jun 2020 11:26:51 +0200

Newsgroups	gmane.network.gnunet.general
Message-ID	<[email protected]>

Hi Aliessio,

I would assume that you are storing the 'struct GNUNET_CADET_Channel' in
one of your application's data structures. Simply store the closure in
the same data structure (or: make it that data structure -- that's
actually the usual design pattern to use).

That way, when _you_ call GNUNET_CADET_channel_destroy(), you can get
the closure from your data structure (just like you got the 'struct
GNUNET_CADET_Channel' from your data structure at that time).

If the other peer closes the channel, _then_ the DisconnectEventHandler
is called with your closure.

I hope this helps!

-Christian

On 6/27/20 3:40 PM, Alessio Vanni wrote:
> Hello,
> 
> I have a service which opens CADET channels when a client requests them
> and "assigns" them to the client, so that each client can have a set of
> multiple channels opened.  Of course clients can also request for the
> associated channels to be closed.
> 
> When a channel is opened, a closure is passed to the create function
> containing some local informations, like which client requested its
> creation and so on.  The closure is allocated dynamically with
> `GNUNET_new'.
> 
> The problem I'm facing is that since this closure is local, when it's
> time to close the channel and free its associated resources, I have no
> way to obtain said closure.  The handler called when a disconnect event
> happens is called correctly and I'm able to clean up there, but the
> documentation says that this function is not called when
> `GNUNET_CADET_channel_destroy' is called, which is used by the service
> to close down channels when requested or when the client disconnects.
> 
> How can I get this closure so that I can free it when the channel is
> closed?
> 
> Thanks,
> A.V.
>

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