Difference between revisions of "Application:Lumberjack"

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|version=0.1.1 Beta

Revision as of 22:22, 18 October 2010

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Lumberjack ss1.png

Lumberjack - 0.3.1


Icon WebOSInternals Lumberjack.png

Lumberjack is an on-device logging tool. It allows you to view and follow the logs for specific applications from the /var/log/messages file.

Its goal is to make debugging apps without a workstation better and easier.


Main screen.png
Lumberjack logView.png

How is the "Retrieve Log" different from the "Follow Log"?

Applications are always logging, the Retrieve Log button gets the entire log since it was last cleared. Where as the Follow Log displays the log in real-time.

• The Follow Log displays logs in real-time.

• The Retrieve Log displays a static once look, but this can be updated by selecting the refresh button.

What is DBus Capture?

The DBus Capture button is to follow service requests in real time. It will show which applications are sending out requests and what the service returns.

For example an application will request GPS services, the log will show this request and what data the service responds to the request.

How do you write to logs?

• Mojo.log events to document and debug their apps. For more information on this technique see Palm's API documentation here Mojo.Log

• Logging can also be displayed with javascripts alert() function, and can by viewed in lumberjack by selecting "Alerts" in the "What to look for" list.

What's the difference between cleaned and raw log scene formats?

• Raw log, copies the exact row from the messages file

2010-10-17T10:51:20.712188Z [1070190] palm-webos-device user.crit LunaSysMgr: {LunaSysMgrJS}: org.webosinternals.lumberjack: Error: Test Error Message, palmInitFramework346:2520

• Cleaned log is formatted

[2010-10-17 10:51:20] (Lumberjack) Error: Test Error Message


By default webOS devices has their logging level set at the "Mojo.log.error" level. Lumberjack changes the logging level from error to debug in the LunaSysMgrJS when it starts. When Lumberjack is closed the logging level reverts back to error when it closes. It is best to test your applications with lumberjack already open.


Preferences screen.png

The Lumberjack preferences screen can be accessed by tapping the menu button on the top left corner of your device.

The "GLOBAL" group:

  • THEME - Changes the applications viewing theme between the standard Palm default (light) theme or the Palm Dark theme.
  • Palm Default
  • Palm Dark
  • LOG LEVEL - Sets the type of log events you want Lumberjack to display.
  • Don't Change - default
  • Alert
  • Error - example: Mojo.Log.error("I have", 3, "eggs.");
  • Warning - example: Mojo.Log.warn("I have", 3, "eggs.");
  • Info - example: Mojo.Log.info("I have", 3, "eggs.");
  • Debug

The "MAIN SCENE" group:

  • Customizes the Lumberjack main scene's behavior
  • List Stock Apps - default set to NO
  • Log in New Card - default set to NO

The "LOG SCENES" group:

  • Customizes Lumberjack's output display
  • Raw Log
  • Cleaned