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From Scott Deboy <scott.de...@gmail.com>
Subject Re: Chainsaw log-parsing classes
Date Sat, 20 Jan 2018 18:00:37 GMT
Yeah - good idea.

Here's the code Chainsaw uses to grab a log4j XML config's
FileAppender definition, including the PatternLayout, and build what's
needed to process the log messages going in to the target file.

BTW this is also how the log4j2 Advertiser integrates with Chainsaw.

                  Map entries =
LogFilePatternLayoutBuilder.getAppenderConfiguration(log4jConfigFile);
                  for (Iterator iter =
entries.entrySet().iterator();iter.hasNext();) {
                    try {
                      Map.Entry entry = (Map.Entry)iter.next();
                      String name = (String) entry.getKey();
                      Map values = (Map) entry.getValue();
                      //values: conversion, file
                      String conversionPattern =
values.get("conversion").toString();
                      File file = new File(values.get("file").toString());
                      URL fileURL = file.toURI().toURL();
                      String timestampFormat =
LogFilePatternLayoutBuilder.getTimeStampFormat(conversionPattern);
                      String receiverPattern =
LogFilePatternLayoutBuilder.getLogFormatFromPatternLayout(conversionPattern);
                      VFSLogFilePatternReceiver fileReceiver = new
VFSLogFilePatternReceiver();
                      fileReceiver.setName(name);
                      fileReceiver.setAutoReconnect(true);
                      fileReceiver.setContainer(LogUI.this);
                      fileReceiver.setAppendNonMatches(true);
                      fileReceiver.setFileURL(fileURL.toURI().toString());
                      fileReceiver.setTailing(true);
                      fileReceiver.setLogFormat(receiverPattern);
                      fileReceiver.setTimestampFormat(timestampFormat);
                      fileReceiver.setThreshold(Level.TRACE);
                      pluginRegistry.addPlugin(fileReceiver);
                      fileReceiver.activateOptions();

Scott

On 1/20/18, Mikael Ståldal <mikes@apache.org> wrote:
> Maybe we could take some code from Chainsaw and implement a
> LogEventParser for Log4j 2?
>
> https://github.com/apache/logging-log4j2/blob/master/log4j-core/src/main/java/org/apache/logging/log4j/core/parser/TextLogEventParser.java
>
>
> On 2018-01-19 17:00, Scott Deboy wrote:
>> Here's info on how you can use the same Receiver Chainsaw uses in your
>> own
>> application - note this is not built in to log4j2:
>>
>> https://stackoverflow.com/questions/47605483/log4j-unstructured-log-parser-in-java-or-scala?rq=1
>>
>> Scott
>>
>> On Jan 19, 2018 7:32 AM, "Joseph Husby" <husby024@umn.edu> wrote:
>>
>> Hello!
>>
>>
>>
>> I’m working on a project where we need to take log4j2 output and
>> (offline)
>> load it into a Mongo database.  We can't use a mongo appender because the
>> database is not available where the software is running.  We could use
>> the
>> log4j2's JsonLayout to have an easily parsable log format, but would
>> prefer
>> not to as it makes the logs less human readable (especially timestamps).
>>
>>
>> Obviously Chainsaw has the capability to parse standard log4j output, but
>> is any of that exposed so we could use those classes in our application?
>> We don’t need the GUI component.
>>
>>
>>
>> Thank you for any help you’re able to provide!
>>
>>
>> ~ Joe ~
>>
>> p.s. resending this after subscribing to the list as I don't see my
>> original message in the archive, so assuming it was rejected.  Sorry if
>> I'm
>> double messaging!
>>
>
>
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