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👱🏻‍♀️ Cindy: iJUG's homebrewn event dispatcher ☕
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‎README.md‎

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# 👱🏻‍♀️ Monika: The iJUG's homebrewn Infrastructure Monitor
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# 👱🏻‍♀️ Cindy: iJUG's homebrewn event dispatcher ☕
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*Monika* is a Java-implemented RESTful Web Service serving as an agent for Uptime Kuma to read the local disk's free space.
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## Use
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* Disk Free: `/monika/status` responds status `100` on hardware failures, status `901` if volume has less than 20% free, status `2XX` in all other cases (where `XX` is the lowest free value in %). The status text contains the smallest free percentage of all monitored volumes. Example: `260 Smallest free volume is 60 %.`
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* Health Check: `/monika/health` responds status 204 always.
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*Cindy* is a Java-implemented RESTful Web Service for collecting events in [iCalender](https://www.rfc-editor.org/rfc/rfc5545.txt) format and publishing them on a Mastodon instance.
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## Administrate
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* `docker logs monika` - Contains one entry for each monitored path per `/status` request, like:
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```
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/home is 60 % free
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/var is 75 % free
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```
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* `docker logs cindy` - Contains (at least) one entry for each processed event.
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## Deploy
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* `docker run --name monika -d -e MONITORED_PATHS=/home:/var -e IP_PORT=8123 -P ghcr.io/ijug-ev/monika`: Monika will listen to requests on port 8123 and monitor paths `/home` and `/var`.
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- `MONITORED_PATH`: Monika will monitor each path in this list. The default is `/`, i. e. only the root file system is monitored.
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- `IP_PORT`: Monika will listen to this IP port. The default is `8080`.
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* `docker run --name cindy -d -e CINDY_IP_PORT=7231 -e ... -P ghcr.io/ijug-ev/cindy`: Cindy will listen to requests on port 7231.
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- `CINDY_IP_PORT`: Cindy will listen to this IP port. The default is `8080`.
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- `CINDY_MASTODON_HOST`: Cindy will publish events on this Mastodon host. There is no default.
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- `CINDY_MASTODON_ACCESS_TOKEN`: Cindy uses this access token to log in to the Mastodon host. There is no default.
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- `CINDY_LAST_RUN_FILE`: Cindy rembembers the instant when it last pulled calenders, so it understands which calender events are new/modified, and which are old. The default is `lastRun`
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- `CINDY_POLLING_SECONDS`: Time between two calendar polls. The default frequency is one minute, i. e. `60`.
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- `CINDY_CALENDAR_SOURCES`: Comma-separated list of download URLs of calendars to poll. There is no default.
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## Build
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mvn clean package
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cp src/main/docker/Dockerfile target
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pushd ./target
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docker build -t monika .
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docker build -t cindy .
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popd
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docker run -it --rm -P monika
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docker run -it --rm -P cindy
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```

‎build‎

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mvn clean package
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cp src/main/docker/Dockerfile target
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pushd ./target
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docker build -t monika .
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docker build -t cindy .
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popd
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docker run -it --rm -P -e OTEL_JAVA_GLOBAL_AUTOCONFIGURE_ENABLED=True -e OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf -e OTEL_EXPORTER_OTLP_ENDPOINT=https://grafana.ijug.eu:8080/otlp -e OTEL_SERVICE_NAME=Monika -e OTEL_METRIC_EXPORT_INTERVAL=15000 -e OTEL_METRICS_EXPORTER=otlp -e OTEL_LOGS_EXPORTER=none -e OTEL_TRACES_EXPORTER=none monika
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docker run -it --rm -P cindy
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‎pom.xml‎

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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>eu.headcrashing.eclipsecon.lightweightmicroservices</groupId>
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<artifactId>monika</artifactId>
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<groupId>eu.ijug.services</groupId>
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<artifactId>cindy</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.release>21</maven.compiler.release>
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<jaxrs.version>3.1.0</jaxrs.version>
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<jersey.version>3.1.9</jersey.version>
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<otelsdk.version>1.43.0</otelsdk.version>
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<jersey.version>3.1.10</jersey.version>
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<ical4j.version>4.1.0</ical4j.version>
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<bigbone.version>2.0.0-SNAPSHOT</bigbone.version>
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</properties>
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<dependencyManagement>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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<dependency>
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<groupId>io.opentelemetry</groupId>
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<artifactId>opentelemetry-bom</artifactId>
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<version>${otelsdk.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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</dependency>
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<dependency>
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<groupId>io.opentelemetry</groupId>
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<artifactId>opentelemetry-api</artifactId>
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</dependency>
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<dependency>
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<groupId>io.opentelemetry</groupId>
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<artifactId>opentelemetry-exporter-otlp</artifactId>
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</dependency>
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<dependency>
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<groupId>io.opentelemetry</groupId>
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<artifactId>opentelemetry-exporter-logging</artifactId>
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<groupId>org.mnode.ical4j</groupId>
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<artifactId>ical4j</artifactId>
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<version>${ical4j.version}</version>
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</dependency>
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<dependency>
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<groupId>io.opentelemetry</groupId>
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<artifactId>opentelemetry-sdk-extension-autoconfigure</artifactId>
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<groupId>social.bigbone</groupId>
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<artifactId>bigbone</artifactId>
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<version>${bigbone.version}</version>
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</dependency>
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</dependencies>
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<repositories>
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<repository>
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<id>maven-central-snapshots</id>
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<name>Maven Central Snapshot Repository</name>
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<url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url>
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<releases>
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<enabled>false</enabled>
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</releases>
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<snapshots>
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<enabled>true</enabled>
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</snapshots>
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</repository>
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</repositories>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.11.0</version>
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<version>3.13.0</version>
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</plugin>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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<version>3.1.0</version>
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<version>3.5.0</version>
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<configuration>
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<mainClass>MonikaBootstrap</mainClass>
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<mainClass>CindyBootstrap</mainClass>
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<systemProperties>
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<systemProperty>
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<key>java.util.logging.SimpleFormatter.format</key>
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<value>[%1$tF %1$tT.%1$tL] [%4$s] %5$s%n</value>
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</systemProperty>
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</systemProperties>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.3.0</version>
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<version>3.4.2</version>
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<configuration>
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<archive>
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<manifest>
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<addClasspath>true</addClasspath>
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<mainClass>MonikaBootstrap</mainClass>
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<mainClass>CindyBootstrap</mainClass>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-shade-plugin</artifactId>
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<version>3.5.1</version>
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<version>3.6.0</version>
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<executions>
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<execution>
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<phase>package</phase>
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</excludes>
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</filter>
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<filter>
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<artifact>io.opentelemetry:*</artifact>
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<artifact>*:ical4j</artifact>
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<includes>
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<include>**/*</include>
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</includes>
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<transformers>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<mainClass>MonikaBootstrap</mainClass>
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<mainClass>CindyBootstrap</mainClass>
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<manifestEntries>
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<Multi-Release>true</Multi-Release>
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</manifestEntries>
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</plugin>
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</plugins>
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</build>
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</project>
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</project>

‎src/main/docker/Dockerfile‎

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FROM gcr.io/distroless/java21-debian12:nonroot
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COPY monika-1.0-SNAPSHOT.jar /home
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RUN [ "java", "-XX:ArchiveClassesAtExit=monika.jsa", "-jar", "/home/monika-1.0-SNAPSHOT.jar", "--stop" ]
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RUN [ "java", "-XX:ArchiveClassesAtExit=healthcheck.jsa", "-jar", "/home/monika-1.0-SNAPSHOT.jar", "--check-health", "--ignore-errors" ]
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COPY cindy-1.0-SNAPSHOT.jar /home
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RUN [ "java", "-Djava.util.logging.SimpleFormatter.format=[%1$tF %1$tT.%1$tL] [%4$s] %5$s%n", "-XX:ArchiveClassesAtExit=cindy.jsa", "-jar", "/home/cindy-1.0-SNAPSHOT.jar", "--stop" ]
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RUN [ "java", "-Djava.util.logging.SimpleFormatter.format=[%1$tF %1$tT.%1$tL] [%4$s] %5$s%n", "-XX:ArchiveClassesAtExit=healthcheck.jsa", "-jar", "/home/cindy-1.0-SNAPSHOT.jar", "--check-health", "--ignore-errors" ]
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EXPOSE 8080
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ENTRYPOINT [ "java", "-XX:SharedArchiveFile=monika.jsa", "-jar", "/home/monika-1.0-SNAPSHOT.jar" ]
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HEALTHCHECK CMD [ "java", "-XX:SharedArchiveFile=healthcheck.jsa", "-jar", "/home/monika-1.0-SNAPSHOT.jar", "--check-health" ]
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ENTRYPOINT [ "java", "-Djava.util.logging.SimpleFormatter.format=[%1$tF %1$tT.%1$tL] [%4$s] %5$s%n", "-XX:SharedArchiveFile=cindy.jsa", "-jar", "/home/cindy-1.0-SNAPSHOT.jar" ]
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HEALTHCHECK CMD [ "java", "-Djava.util.logging.SimpleFormatter.format=[%1$tF %1$tT.%1$tL] [%4$s] %5$s%n", "-XX:SharedArchiveFile=healthcheck.jsa", "-jar", "/home/cindy-1.0-SNAPSHOT.jar", "--check-health" ]

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