Chetan Mehrotra created SLING-3048:
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Summary: Filter to populate SLF4J MDC with request details
Key: SLING-3048
URL: https://issues.apache.org/jira/browse/SLING-3048
Project: Sling
Issue Type: Improvement
Components: Extensions
Reporter: Chetan Mehrotra
Attachments: org.apache.sling.extensions.mdc-0.0.1-SNAPSHOT-src.zip
With Commons Log moving to Logback its possible to use MDC [1] support of SLF4J
in Sling to get better logs and also enable better filtering of logs. The patch
adds a new extension module which registers a {{MDCInsertingFilter}}. This
filter can extract information from incoming request and add them to the MDC
Features supported
1. By default expose details like Request path, Query String etc based on [3]
2. Exposes OSGi config where one can define what HTTP Header, Parameter or
Cookie needs to be added to MDC
3. Exposes Session ID, USer Information from RequestResolver associated with
current thread of execution
This information can then later be exposed via logs like shown below. Here we
expose the SessionID as part of log
---
%d{dd.MM.yyyy HH:mm:ss.SSS} *%level* [%thread] %logger [%X{jcr.sessionId}]
%msg%n
---
The same information can also be used to filter logs based on user,url etc or
used in custom Logging event evaluator
For more details refer to [2]
[1] http://www.slf4j.org/manual.html#mdc
[2] https://github.com/chetanmeh/sling-logback/tree/master/mdc
[3] http://logback.qos.ch/manual/mdc.html#mis
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