<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
I'm replying to this old thread to reopen this conversation about
reading log files. I've complete some work [1] on reading log files
via an operation. This is not exactly like the JIRA suggests where
it would only read the last 10 error messages. All this change
allows is the raw contents of the file to be read. The idea is this
could be used to read the entire contents of the log file as a
whole, or in chunks.<br>
<br>
What I've done is added two new operations list-log-files and
read-log-file.<br>
<br>
The list-log-files simply lists all files in the
jboss.server.log.dir. This may or may not be a good idea really. I
can see some potential security risks here mainly just seeing files
that may contain sensitive data. One way I've thought of to get
around that is read the logging subsystem model and only show files
from known types like the file-handlers. The main issue with that is
there is no good way to get this to work for custom-handlers.<br>
<br>
The read-log-file simple does what it says and reads the contents of
a log file line by line. Reading line by line should work for the
most part unless the an non-standard line delimiter is used. There
are 5 options for this option;<br>
<ul>
<li>name (required): the name of the log file to read</li>
<li>encoding: the encoding for the log file</li>
<li>lines: the number of lines to read, defaults to 10</li>
<li>skip: the number of lines to skip before adding the results</li>
<li>tail: true to read from the bottom up, default is true</li>
</ul>
<p>The result of this is just a list of lines with the \n or \r\n
stripped. Just to clarify too a line means a line in the file, not
a log record e.g. stack traces are generally composed of multiple
lines.<br>
</p>
<p>So this begs the question, will this work for what we want? What
concerns does anyone else have?<br>
</p>
<p>I have not yet submitted a PR yet as I wanted to get some
feedback before we bake it in.<br>
</p>
<br>
[1]:
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<a href="https://github.com/jamezp/wildfly/compare/WFLY-280-read">https://github.com/jamezp/wildfly/compare/WFLY-280-read</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 08/14/2013 10:03 AM, James R.
Perkins wrote:<br>
</div>
<blockquote cite="mid:520BB865.6000102@redhat.com" type="cite">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
I had posted this to another list, but this is a more appropriate
place for it. I think there needs to be a general discussion
around this as it's been mentioned, at least to me, a few times
here and there and I know Heiko raised the issue some time a go
now.<br>
<br>
The original JIRA, WFLY-280[1], is to display the last 10 error
messages only. To be honest I wouldn't find that very useful. To
me if I'm looking for logs I want to see all logs, but that's not
always so easy. Like the syslog-handler which doesn't log to a
file so there is no way to read those messages back. <br>
<br>
The current plan for the last 10 error messages is we store
messages in a queue that can be accessed via an operation. This
works fine until the error message you're interested in is 11 or
you want to see warning messages. <br>
<br>
Another option I had come up with is reading back the contents of
the file, for example the server.log. This could be problematic
too in that there is no way to filter information like only see
error messages or only see warning messages. To solve this I have
considered creating a JSON formatter so the results could be
queried, but I don't think it should be a default which would mean
it's not reliable for the console to assume it's getting back
JSON. <br>
<br>
I've also thought about, haven't tested this and it may not work
at all, creating a handler that uses websockets to send messages.
I'm not sure how well this would work and it's possible it may not
even work for bootstrap logging. <br>
<br>
With regards to audit logging, we're probably going to have to do
something totally different from what we'll do in the logging
subsystem since it doesn't use standard logging. <br>
<br>
I guess the bottom line is what does the console want to see? Do
you want to see all raw text log messages? Do you want all
messages but in a format like JSON that you can query/filter? Do
you really want only the last 10 error messages only? All or none
of these might be possible, but I really need to understand the
needs before I can explore more in depth what the best option
would be.<br>
<br>
[1]:
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<a moz-do-not-send="true"
href="https://issues.jboss.org/browse/WFLY-280">https://issues.jboss.org/browse/WFLY-280</a>
<pre class="moz-signature" cols="72">--
James R. Perkins
Red Hat JBoss Middleware</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
James R. Perkins
Red Hat JBoss Middleware</pre>
</body>
</html>