whenever you have a parsing problem, log the messages with the template
RSYSLOG_DebugFormat
90%+ of the time, we find that the contents of the variables are not what you
are expecting, and the rest of the time, seeing the debug output lets us figure
out what is going wrong with the parser
Also, what version of rsyslog are you running?
David Lang
On Thu, 17 Jun 2021, John Chivian via
rsyslog wrote:
Date: Thu, 17 Jun 2021 11:05:21 -0500
From: John Chivian via rsyslog <[email protected]>
To: rsyslog-users <[email protected]>
Cc: John Chivian <[email protected]>
Subject: [rsyslog] Odd parse_json Behavior With imfile Input
I am using the parse_json function to determine whether or not the msg element
is a JSON object.
set $.isjson = parse_json($msg, "\$!parsed");
if ($.isjson == 0) then {
set $!jmsg = $msg;
set $!smsg = "";
} else {
set $!jmsg = "null";
set $!smsg = $msg;
}
For network input this seems to always work, but for file input we seeing odd
behavior where some strings that are not JSON objects are being identified as
if they were JSON objects.
Case in point is the msg "a,b,c,d,e,f”. If received over the network (imptcp)
with a proper syslog header, this msg is correctly identified as not being a JSON
object, and the value is applied to the $!smsg element in the if construct that
follows.
However, if that same string is received in file input (imfile), the message is
incorrectly identified as being a JSON object and the value is applied to the $!jmsg
element. The same is true if the fields are pipe delimited as "a|b|c|d|e|f".
If I modify the msg to be wrapped in parenthesis, i.e. "(a,b,c,d,e,f)” or
“(a|b|c|d|e|f)", then the string is identified properly in both cases.
Another thing that may be of significance is that if I add a syslog header to
each line of the file input, and specify needparse=“on” in the file input
definition, the issue goes away and the msg element is always identified
properly.
This is v8.2102. I’m not sure if this is a bug or if I’m missing something
fundamental about the differences between input types, so any advice or
guidance is greatly appreciated.
Thanks all!
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_______________________________________________
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https://lists.adiscon.net/mailman/listinfo/rsyslog
http://www.rsyslog.com/professional-services/
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NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad of
sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you DON'T LIKE
THAT.
