AW: Processing all messages with NEB

[Andreas Ericsson]

Mohr James wrote:
> Hi Andreas!
> 
> Thank you very much for your prompt and very useful response. There are
> a few comments below:
> 
> <SNIP>
> 
>>>>int helloworld_handle_status(int event_type, void *data){ char 
>>>>temp_buffer[1024]; service * tmp_service; 
>>>>nebstruct_service_status_data * service_status_data; if( 
>>>>(service_status_data=(nebstruct_service_status_data *)data) ){ 
>>>>tmp_service = (service *) service_status_data->object_ptr;
>>>>snprintf(temp_buffer,sizeof(temp_buffer)-1,"EVENT: %d MESSAGE:
>>>>%s",event_type,tmp_service->plugin_output); } 
>>>>write_to_all_logs(temp_buffer,NSLOG_INFO_MESSAGE); /*
>>>>write_to_all_logs("inside:
>>>>helloworld_handle_status",NSLOG_INFO_MESSAGE); */ }
>>>>
>>>>However, when use tmp_service->plugin_output, it says 
>>>
>>>"structure has 
>>>
>>>>no member named `plugin_output'". Inside of 
>>>
>>>../include/ojects.h, there 
>>>
>>>>is the definition of the service_struct, which shows me
>>>>
>>>>char    *plugin_output;
>>>>
>>>>However, this is within an the block #ifdef NSCORE.
>>>
>>>Which is correct. All NEB-modules must #define NSCORE, since 
>>>that's where they'll be running. #ifndef NSCORE is for the cgi's.
>>>
>>>
>>>>Moving the line
>>>>outside of the block, it will compile but when I send 
>>>
>>>something to a 
>>>
>>>>service with send_nsca  the value of plugin_output ends up 
>>>
>>>being null. 
>>>
>>>>So, I am at a loss how to get the text of the plugin_output.
>>>>
>>>
>>>This is because you're fetching it from 
>>>service_status_data->object_ptr->plugin_output which isn't 
>>>filled in by the time you get the data.
>>>
>>>You need to reference service_status_data->output instead.
> 
> 
> 
> After I sent the email, I moved the #define NSCORE to the very beginning
> of the source file (before *all* of the includes. This seemed to catch
> everything and there were no compile errors even after moving
> tmp_service->plugin_output back to the right place in objects.h. I'll
> try it with service_status_data->output and see how that works.
> 
> 
>>>Please keep in mind that the neb-code is to be considered 
>>>fairly volatile. It's possible (and quite likely) that some 
>>>of the variables of the nebstruct_*_data structs will 
>>>disappear in the next overhaul.
> 
> 
> Thanks for the warning! ;-) Is there an announcement mailing list or
> something?
> 

That would be the nagios-devel and nagios-cvs mailing lists (nagios-cvs 
for commit messages).

> 
>>>>I have looked at th code for the mysql inserter module. 
>>>
>>>However, I get 
>>>
>>>>stuck here as well.One thing that is unclear is whether **all** 
>>>>messages get sent through here or just the status changes. 
>>>
>>>I need all 
>>>
>>>>of the messages and not just the status changes.
>>>>
>>>
>>>All results of all checks are passed through the modules. 
>>>Once before the plugin is executed and once after.
> 
> 
> I figured as much. I managed to change the message text (see below), but
> it was getting changed twiced.
> 
> 
>>>>An additional goal is to be able to process and change the 
>>>
>>>messages 
>>>
>>>>before being sent to the GUI. For example, the text 
>>>
>>>contains a code 
>>>
>>>>number which tells the system to change the text to a 
>>>
>>>specific URL so 
>>>
>>>>all you need to do is click on the message text to  get 
>>>
>>>instructions 
>>>
>>>>on what to do in a specific case. However, I have not yet 
>>>
>>>figured out 
>>>
>>>>how to change the message that appears in the GUI.
>>>>
>>>
>>>You can rewrite it with a module. Make sure you take care 
>>>not to leak any memory.
> 
> 
> Thanks for the tip. The last time I did any C code at this level was 10
> years ago so I can use all the help I can get.
>  
> 
>>>You're on your own when it comes to writing new code. I'll 
>>>gladly answer neb-module questions though, so it at least 
>>>gets documented somewhere.
> 
> 
> "In the next world, you're on your own."
> 
> Well then, you will probably be hearing a lot from me. ;-)
> 
> In addition to my "real" job I am a professional writer and I love to
> write. What I can do it to take the material that is passed back and
> forth in the mailing list and try to put it together in something
> coherent. I have already started putting my notes together and will post
> them  on my web site as I progress (I hope).
> 

Cool. It's about time someone wrote up a doc on the neb-abi. Make sure 
to keep a note on the website that the interface is subject to change 
without notice.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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