cryostat-reports

This project uses Quarkus, the Supersonic Subatomic Java Framework.

If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .

API

This microservice exposes only one API endpoint: POST /report. This expects multipart/form-data, with a form field named file containing a JFR binary file (application/octet-stream). The response is an Automated Analysis Report in text/html format. The uploaded file is not preserved and no caching is performed - this is expected to be handled by the "parent" Cryostat application that is sending the JFR binary data.

Running the application in dev mode

You can run your application in dev mode that enables live coding using:

./mvnw compile quarkus:dev

NOTE: Quarkus now ships with a Dev UI, which is available in dev mode only at http://localhost:8080/q/dev/.

Packaging and running the application

The application can be packaged using:

./mvnw package

It produces the quarkus-run.jar file in the target/quarkus-app/ directory. Be aware that it’s not an über-jar as the dependencies are copied into the target/quarkus-app/lib/ directory.

The application is now runnable using java -jar target/quarkus-app/quarkus-run.jar.

An OCI image tagged as quay.io/cryostatio/cryostat-reports will also be built using podman and loaded into your local podman image registry.

If a Quarkus build failure is encountered due to being unable to build a Docker image, then:

sudo dnf install podman-docker

Note: If docker is already installed, then starting the docker service will solve the issue.

Creating a native executable

You can create a native executable using:

./mvnw package -Pnative

Or, if you don't have GraalVM installed, you can run the native executable build in a container using:

./mvnw package -Pnative -Dquarkus.native.container-build=true

You can then execute your native executable with: ./target/cryostat-reports-*-runner

If you want to learn more about building native executables, please consult https://quarkus.io/guides/maven-tooling.

Native image mode requires registration of reflective classes and accesses. See this guide for detail: https://www.graalvm.org/reference-manual/native-image/Agent/

In short, download the GraalVM CE distribution. Then do:

# replace with actual path to downloaded and extracted GraalVM
export JAVA_HOME=~/workspace/graalvm-ce-java21-21.0.2/
# run the application JAR with the tracing agent attached. This is a JVM-mode JAR!
$JAVA_HOME/bin/java -agentlib:native-image-agent=config-output-dir=graal-config -jar target/cryostat-reports-*-runner.jar
# in another terminal, make a request to exercise the expected microservice code path. Some "fully-featured"
# JFR file should be used here - one that uses all possible event types used in rules analysis,
# so that all rule pathways execute
http -f :8080/report file@example.jfr
# ctrl-c to kill the running Quarkus application, then
# cp graal-config/* src/main/resources/