mirror of
https://github.com/openhab/openhab-addons.git
synced 2025-01-10 15:11:59 +01:00
129 lines
6.5 KiB
Markdown
129 lines
6.5 KiB
Markdown
# 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 are 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
|
|
- 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 error events. |
|
|
| `errorBlacklistingPatterns` | String | no | | Search patterns for blacklisting unwanted error events separated by \| character. |
|
|
| `warningPatterns` | String | no | `WARN+` | Search patterns separated by \| character for warning 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](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/regex/Pattern.html).
|
|
Be aware that search patterns are case sensitive.
|
|
|
|
## Channels
|
|
|
|
List of channels
|
|
|
|
| Channel Type ID | Item Type | Description |
|
|
| ------------------ | ------------ | ----------------------------------------------------------- |
|
|
| `lastErrorEvent` | `String` | Displays content of last [ERROR] event |
|
|
| `lastWarningEvent` | `String` | Displays content of last [WARN] event |
|
|
| `lastCustomEvent` | `String` | Displays content 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
|
|
|
|
```java
|
|
|
|
logreader:reader:openhablog[ refreshRate=1000, errorPatterns="ERROR+", errorBlacklistingPatterns="annoying error which should be ignored|Another annoying error which should be ignored" ]
|
|
|
|
```
|
|
|
|
### example.items
|
|
|
|
```java
|
|
|
|
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
|
|
|
|
```perl
|
|
|
|
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
|
|
|
|
```java
|
|
rule "LogReader"
|
|
when
|
|
Channel "logreader:reader:openhablog:newErrorEvent" triggered
|
|
then
|
|
// do something
|
|
end
|
|
```
|
|
|
|
Use the rules with your Telegram Bot (need openHAB Telegram Binding installed and configured)
|
|
|
|
```java
|
|
rule "LogReader"
|
|
when
|
|
Channel 'logreader:reader:openhablog:newErrorEvent' triggered
|
|
then
|
|
val telegramAction = getActions("telegram","telegram:telegramBot:myBot")
|
|
telegramAction.sendTelegram("*ERROR* LogReader Event!\n%s Errors are in the log! Here is the last row of it:\n`%s`", logreaderErrors.state.toString, logreaderLastError.state.toString)
|
|
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](https://www.openhab.org/docs/administration/logging.html#defining-what-to-log) for more help.
|