[kea-dev] Suggestion for new hooks: server startup, shutdown, reload

Marcin Siodelski marcin at isc.org
Mon Nov 24 17:09:25 UTC 2014


Nicolas,

At present, hook libraries have no means to access the configuration
manager or the lease database. However, we plan to implement it. Please
see: http://kea.isc.org/ticket/3456 and some other tickets it references.

Marcin



On 11/20/14 16:37, Chaigneau, Nicolas wrote:
> 
> Woops... I've just realized that there are already "load" and "unload" functions for hook libraries!
> My bad.
> 
> 
> Still, I've got some questions:
> 
> I'm not sure what can be done with the "LibraryHandle" argument ? (apart from registering and deregistering callouts)
> 
> Would it possible in the "load" function to access the subnets, leases, etc, managed by the server ?
> 
> 
> 
> 
> Regards,
> Nicolas.
> 
> 
> -----Message d'origine-----
> De : kea-dev-bounces at lists.isc.org [mailto:kea-dev-bounces at lists.isc.org] De la part de Chaigneau, Nicolas
> Envoyé : mercredi 19 novembre 2014 17:05
> À : kea-dev at lists.isc.org
> Objet : [kea-dev] Suggestion for new hooks: server startup, shutdown, reload
> 
> Hello again,
> 
> 
> The hook mechanism provided within Kea looks very handy.
> I think it could be extended with new hook points. What do you think of the following proposal ?
> 
> 
> - "server startup" hook:
> Triggered after server has been started, configuration read, subnets initialized, leases loaded from backend; and just before the server actually starts processing DHCP packets.
> This would allow a hook library to:
> - Read its configuration (if it has one)
> - Perform the initialization steps it requires
> - If something wrong happens it could report through an output error code, which would cause the server to stop (as when the main configuration is incorrect, for instance).
> 
> The hook should provide access to anything the hook library needs.
> For my needs, I can think of the subnets collection and the leases collection. The list is open though.
> 
> 
> - "server shutdown" hook:
> Triggered just before the server is about to be shut down.
> This would give a hook library a chance to perform some termination steps, if need be. Close handles, etc.
> (although on Linux it's not strictly needed, it's still cleaner to do so).
> 
> 
> - "library reload" hook:
> Triggered after the hook library is reloaded (after the server has processed the "libreload" command) I think the same possibilities as in "server startup" should be provided.
> 
> 
> 
> 
> Regards,
> Nicolas.
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