Re: [naviserver-devel] RFE: Expanding ns_log/ns_logctl

[Vlad S. <vl...@cr...>]

Go ahead if it will not break "simple" logging and ns_log behaviour

Zoran Vasiljevic wrote:
> Hi!
> 
> I have a need of adding more features to the existing
> ns_log facility.
> 
> We have tons of code emitting ns_log messages into the
> server logfile. But as everything ends up in one single
> file, it is somethimes extremely difficult to analyze it
> as you may end up in staring at 100'000s of lines.
> 
> Our application generates jobs. Each jobs uses modules
> and modules log things (i.e calls ns_log). What we'd
> need is a way to "teach" the ns_log command that it is
> emitting log in the context of the job X and perhaps
> route log data to a specific log file. This way we could
> group the log entries that correspond to one job into one
> per-job file. This is far easier to analyze and debug, of course.
> 
> What I have in mind is a kind of push/pop mechansim where
> I could do something like:
> 
>     ns_logctl push <mylogprocedure1>
>     ...
>     ns_logctl push <mylogprocedure2>
>     ...
>     ns_logctl pop
>     ...
>     ns_logctl pop
> 
> This would instruct the ns_log facility to invoke registered
> callbacks one by one. Each callback will do something and
> all will eventually end up at the low-level common-denominator
> being the current log file. Every callback might/could signalize
> two states: continue or break. According to that, the next
> registered call will be called (continue) or not (break).
> 
> The callbacks themselves would be just Tcl code which will be
> prepared by the caller and "ns_logctl push"'ed on the stack
> of registered handlers.
> 
> Now, in order to do that I will have to modify ns_logctl command
> and modify internal operation of ns_log to walk in LIFO fashion
> list of registered handlers and invoke each one of them in
> succession.
> 
> Are there any better ideas how to achieve this? If not, is everybody
> OK with the proposed change?
> 
> Cheers,
> Zoran
> 
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-- 
Vlad Seryakov
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vl...@cr...
http://www.crystalballinc.com/vlad/