On Thu, Sep 12, 2013 at 4:27 AM, Erik Steffl <[email protected]> wrote:
> On 09/09/2013 10:06 PM, David Lang wrote:
>
>> On Mon, 9 Sep 2013, Erik Steffl wrote:
>>
>> On 09/09/2013 08:00 PM, David Lang wrote:
>>>
>>>> On Mon, 9 Sep 2013, Erik Steffl wrote:
>>>>
>>>> On 09/09/2013 07:22 PM, David Lang wrote:
>>>>>
>>>>>> On Mon, 9 Sep 2013, Erik Steffl wrote:
>>>>>>
>>>>>> Using a property in template (after action(type="mmjsonparse")
>>>>>>> succeeds):
>>>>>>>
>>>>>>> property(name="$!key!**anotherKey")
>>>>>>>
>>>>>>> Is there a way to specify default value (just a string constant,
>>>>>>> nothing dynamic) that should be used in case incoming messages do not
>>>>>>> have $key!anotherKey element?
>>>>>>>
>>>>>>
>>>>>> not directly, but you can do:
>>>>>>
>>>>>> if isempty($!key!anotherKey) then $!key!anotherKey=default
>>>>>>
>>>>>
>>>>> that changes the parsed json structure though which I was hoping to
>>>>> avoid,
>>>>>
>>>>
>>>> huh? how does it change it any more than setting a default value for
>>>> $!key!anotherKey would?
>>>>
>>>
>>> I do not want to set $!key!anotherKey to the default value, I want to
>>> use a default value in template if there is no value in incoming
>>> message for $!key!anotherKey
>>>
>>> template(name="**dynamicFilename" type="list") {
>>> constant(value="/var/log/")
>>> property(name="$!key")
>>> }
>>>
>>> I would like to achieve:
>>>
>>> - if there is no "key" in icoming message, e.g. @cee:{"a":"b"}
>>> filename would be: /var/log/no-such-key
>>>
>>> - if there is "key" in incoming message, e.g. @cee:{"key":"got-a-key"}
>>> filename would be: /var/log/got-a-key
>>>
>>> I would like to achieve the above, preferably without changing the
>>> parsed incoming message. In other words I would like to use the
>>> property $!key if it exists, otherwise use a default value.
>>>
>>
>> Ok, one new feature that was recently added was a separate namespace
>> that you can use that won't show up in $!
>>
>> this is the $, namespace
>>
>> so you can do
>>
>> if isempty($!key) then
>> set $.filename="/var/log/no-such-**key";
>> else
>> set $.filename="/var/log/%$!key%";
>>
>> then you can use $.filename in your template.
>>
>
> Just tested this with new release 7.5.3 and the $.var part works but it
> seems that isempty is returning false even for $!key that does nto exists
> in json message (in fact there is no json message in this case.
>
> if isempty($!yummlyLogOrigin!**supportLevel) then
> set $.supportLevel = "noSupportLevel";
> else
> set $.supportLevel = "someSupportLevel";
>
> then I am using $.supportLevel in DynaFile template and end up with
> 'someSupportLevel' even thought this is in block where json parsing failed
> (and the message is not json).
>
> even tried:
>
> if isempty($!yummlyLogOrigin!**supportLevel) then
> set $.supportLevel = "noSupportLevel";
> else
> set $.supportLevel = $!yummlyLogOrigin!**supportLevel;
>
> in which case the $.supportLevel ends up being empty.
>
> running rsyslogd-dn reveals:
>
> 1929.256799878:7f86cdede700: scriptExec: batch of 1 elements, active
> 0x7f86c8000900, active[0]:1
> 1929.256805683:7f86cdede700: IF
> 1929.256817375:7f86cdede700: function 'isempty' (id:0, params:1)
> 1929.256836689:7f86cdede700: var '$!yummlyLogOrigin!**
> supportLevel'
> 1929.256855896:7f86cdede700: eval expr 0x1b1a570, type 'F[70]'
> 1929.256862685:7f86cdede700: rainerscript: executing function id 0
> 1929.256869302:7f86cdede700: rainerscript: invalid function id 0 (name
> 'isempty')
>
> it seems that I cannot use ismepty as a function. I don't see isempty
> mentioned in rainerscript docs at http://www.rsyslog.com/doc/**
> rainerscript.html <http://www.rsyslog.com/doc/rainerscript.html> but I
> see isempty documented here http://www.rsyslog.com/doc/**
> rsyslog_conf_filter.html<http://www.rsyslog.com/doc/rsyslog_conf_filter.html>but
> not sure if that means it can be used in if (and how).
>
That's the point - "isempty" is a property-based filter thing. Obviously,
you are right and having it as a function would make sense, but currently
there is no such function.
>
> also tried:
>
> if $!yummlyLogOrigin!supportLevel == "" then
>
> which seems to be working, is that the best way to test if there is no
> value for $!yummlyLogOrigin!**supportLevel?
>
>
I'd say that's the simplest work-around currently possible (assuming that
an empty string cannot occur validly).
Rainer
> thanks!
>
> erik
>
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