[wildfly-dev] Reading Logs from Web Console

Wed Sep 25 11:36:33 EDT 2013

Right, by "current" I meant to read the logging setup and if there's 
just one file appender, take it as default. Or, if that would be 
inappropriate mixing of abstraction layers, just "server.log".

On 25.9.2013 12:06, Kabir Khan wrote:
> Current log could be the server.log in a standard setup. If someone has done something more advanced in their logging setup, the name becomes necessary
> On 25 Sep 2013, at 08:34, Jaikiran Pai wrote:
>
>> On Wednesday 25 September 2013 09:25 AM, Ondrej Zizka wrote:
>>> 1) Could it have a "read-log-file()" without name= specified, which would read the "current" log file?
>> Given the way logger categories and appenders/handlers interact, within a logging framework, I don't think there's any notion of "current log file". It's a very valid scenario where a single logging category can be backed by different appenders (some of them file appenders) with different attributes and each such appender writing out to a different file. So having a name of the log file you want to view, becomes necessary.
>>
>> -Jaikiran
>>
>>> 2) Regarding security - what, besides logs, do we expect to be in the log dir? Could the admin block it by setting write-only rights?
>>>
>>> Ondra
>>>
>>> On 25.9.2013 02:40, James R. Perkins wrote:
>>>> 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.
>>>>
>>>> What I've done is added two new operations list-log-files and read-log-file.
>>>>
>>>> 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.
>>>>
>>>> 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;
>>>> 	• name (required): the name of the log file to read
>>>> 	• encoding: the encoding for the log file
>>>> 	• lines: the number of lines to read, defaults to 10
>>>> 	• skip: the number of lines to skip before adding the results
>>>> 	• tail: true to read from the bottom up, default is true
>>>> 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.
>>>>
>>>> So this begs the question, will this work for what we want? What concerns does anyone else have?
>>>>
>>>> I have not yet submitted a PR yet as I wanted to get some feedback before we bake it in.
>>>>
>>>>
>>>> [1]: https://github.com/jamezp/wildfly/compare/WFLY-280-read
>>>>
>>>>
>>>> On 08/14/2013 10:03 AM, James R. Perkins wrote:
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> 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.
>>>>>
>>>>> [1]: https://issues.jboss.org/browse/WFLY-280
>>>>> -- 
>>>>> James R. Perkins
>>>>> Red Hat JBoss Middleware
>>>>>
>>>>   
>>>> -- 
>>>> James R. Perkins
>>>> Red Hat JBoss Middleware
>>>>
>>>>
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