Log Reader Binding

This binding reads and analyzes log files. Search patterns are fully configurable, therefore different kind of log files should be possible to monitor by this binding. When certain log events is recognized, openHAB rules can be used to send notification about the event e.g by email for further analysis.

Supported Things

This binding supports one ThingType: reader. A reader supports 3 separate channels; One for errors, one for warnings and one custom channel for other purposes.

Thing Configuration

The reader Thing has the following configuration parameters:

Parameter Type Required Default if omitted Description
filePath String yes ${OPENHAB_LOGDIR}/openhab.log Path to log file. ${OPENHAB_LOGDIR} is automatically replaced by the correct directory.
refreshRate integer no 1000 Time in milliseconds between individual log reads.
errorPatterns String no ERROR+ Search patterns separated by | character for warning events.
errorBlacklistingPatterns String no Search patterns for blacklisting unwanted error events separated by | character.
warningPatterns String no WARN+ Search patterns separated by | character for error events.
warningBlacklistingPatterns String no Search patterns for blacklisting unwanted warning events separated by | character.
customPatterns String no Search patterns separated by | character for custom events.
customBlacklistingPatterns String no Search patterns for blacklisting unwanted custom events separated by | character.

Search patterns follows Java regular expression syntax. See https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html.

Channels

List of channels

Channel Type ID Item Type Description
lastErrorEvent String Displays contents of last [ERROR] event
lastWarningEvent String Displays contents of last [WARN] event
lastCustomEvent String Displays contents of last [CUSTOM] event
errorEvents Number Displays number of [ERROR] lines matched to search pattern
warningEvents Number Displays number of [WARN] lines matched to search pattern
customEvents Number Displays number of [CUSTOM] lines matched to search pattern
logRotated DateTime Last time when log rotated recognized
newErrorEvent - Trigger channel for last [ERROR] line
newWarningEvent - Trigger channel for last [WARN] line
newCustomEvent - Trigger channel for last [CUSTOM] line

Examples

example.things


logreader:reader:openhablog[ refreshRate=1000, errorPatterns="ERROR+", errorBlacklistingPatterns="annoying error which should ignored|Another annoying error which should ignored" ]

example.items


DateTime logreaderLogRotated        "Last Log Rotation [%1$tY.%1$tm.%1$te %1$tR]"   <time>  { channel="logreader:reader:openhablog:logRotated" }
Number   logreaderErrors            "Error events matched [%d]"                     <alarm> { channel="logreader:reader:openhablog:errorEvents" }
String   logreaderLastError         "Last error [%s]"                                       { channel="logreader:reader:openhablog:lastErrorEvent" }
Number   logreaderWarnings          "Warning events matched [%d]"                   <alarm> { channel="logreader:reader:openhablog:warningEvents" }
String   logreaderLastWarning       "Last warning [%s]"                                     { channel="logreader:reader:openhablog:lastWarningEvent" }
Number   logreaderCustoms           "Custom events matched [%d]"                    <alarm> { channel="logreader:reader:openhablog:customEvents" }
String   logreaderLastCustom        "Last Custom [%s]"                                      { channel="logreader:reader:openhablog:lastCustomEvent" }

example.sitemap


sitemap logreader_example label="Example" {
	Frame label="openHAB Log Reader" {
		Text item=logreaderErrors
		Text item=logreaderLastError
		Text item=logreaderWarnings
		Text item=logreaderLastWarning
		Text item=logreaderCustoms
		Text item=logreaderLastCustom
		Text item=logreaderLogRotated
	}
}

example.rules

rule "LogReader"
    when
        Channel "logreader:reader:openhablog:newErrorEvent" triggered
    then
        // do something
    end

Be careful when sending e.g. email notifications. You could easily send thousand of spam emails in short period if e.g. one binding is in error loop.

Thing status

Check thing status for errors.

Verbose logging

Enable DEBUG logging in karaf console to see more precise error messages:

log:set DEBUG org.openhab.binding.logreader

See openHAB2 logging docs for more help.