JarCastingvertx lambda
Run native Lambda's with Vert.x
Disclaimer - This project should be considered a POC and has not been tested or verified for production use. If you decided to run this on production systems you do so at your own risk.
Building this Runtime
This runtime should give you all the boilerplate code for:
- AWS Lambda
- Knative
- OpenFaaS
Compile the Runtime Classes
$ mvn package
Writing your lambda
Create a project and add the dependency:
<dependency>
<groupId>xyz.jetdrone</groupId>
<artifactId>vertx.lambda</artifactId>
<version>LATEST</version>
</dependency>
Create a lambda as:
package com.example;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.eventbus.Message;
import io.vertx.core.json.JsonObject;
import xyz.jetdrone.vertx.lambda.Lambda;
public class MyLambda implements Lambda<Buffer> {
@Override
public void handle(Message<Buffer> event) {
System.out.println("HEADERS: " + event.headers());
System.out.println("BODY: " + event.body());
// Here your business logic...
event.reply("OK");
}
}
And register your class in the service loader src/main/resources/META-INF/services/xyz.jetdrone.vertx.lambda.Lambda:
# List all available Lambdas here
com.example.knativelambda.MyLambda
Build
AWS Lambda
In your pom.xml add the plugins:
<build>
<plugins>
<plugin>
<groupId>com.oracle.substratevm</groupId>
<artifactId>native-image-maven-plugin</artifactId>
<version>${graal.version}</version>
<executions>
<execution>
<goals>
<goal>native-image</goal>
</goals>
<phase>package</phase>
</execution>
</executions>
<configuration>
<mainClass>xyz.jetdrone.vertx.lambda.knative.Bootstrap</mainClass>
<imageName>bootstrap</imageName>
<buildArgs>--report-unsupported-elements-at-runtime --allow-incomplete-classpath --no-server</buildArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<dependencies>
<dependency>
<groupId>xyz.jetdrone</groupId>
<artifactId>vertx.lambda</artifactId>
<version>LATEST</version>
</dependency>
</dependencies>
<configuration>
<descriptorRefs>
<descriptorRef>aws-function</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
The first plugin will compile your code to a native-image and the second will zip your function as required by AWS.
Knative
In your pom.xml add the plugins:
<build>
<plugins>
<plugin>
<groupId>com.oracle.substratevm</groupId>
<artifactId>native-image-maven-plugin</artifactId>
<version>${graal.version}</version>
<executions>
<execution>
<goals>
<goal>native-image</goal>
</goals>
<phase>package</phase>
</execution>
</executions>
<configuration>
<mainClass>xyz.jetdrone.vertx.lambda.knative.Bootstrap</mainClass>
<imageName>bootstrap</imageName>
<buildArgs>--report-unsupported-elements-at-runtime --allow-incomplete-classpath --no-server</buildArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.1.1</version>
<executions>
<execution>
<id>unpack</id>
<phase>package</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>xyz.jetdrone</groupId>
<artifactId>vertx.lambda</artifactId>
<version>LATEST</version>
<type>jar</type>
<overWrite>false</overWrite>
<outputDirectory>${project.build.directory}</outputDirectory>
<includes>**/knative/*</includes>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
The first plugin will compile your code to a native-image and the second will unpack a default service.yaml to be used to deploy your lambda.
OpenFaaS
In your pom.xml add the plugin:
<build>
<plugins>
<plugin>
<groupId>com.oracle.substratevm</groupId>
<artifactId>native-image-maven-plugin</artifactId>
<version>${graal.version}</version>
<executions>
<execution>
<goals>
<goal>native-image</goal>
</goals>
<phase>package</phase>
</execution>
</executions>
<configuration>
<mainClass>xyz.jetdrone.vertx.lambda.knative.Bootstrap</mainClass>
<imageName>bootstrap</imageName>
<buildArgs>--report-unsupported-elements-at-runtime --allow-incomplete-classpath --no-server</buildArgs>
</configuration>
</plugin>
</plugins>
</build>
The plugin will compile your code to a native-image.
Next steps
Lambdas are exposed to vert.x event bus, however for knative and openFaaS you might need to map the functions to URLs too. In this case you can override the method alias:
public class MyLambda implements Lambda<Buffer> {
@Override
public String alias() {
return "/";
}
}
In this case the mapping is not base on the fully qualified class name, but on the given alias.
Finally
Deploy and profit!