gradle-dropwizard

Gradle plugin to

• start/stop dropwizard manually
• start/stop dropwizard as part of your integration/acceptance test tasks (these tasks are created by the plugin)
• build a runnable jar file

WARNING: this plugin has only been tested on Debian/Linux and relies on java.lang.UNIXProcess. It is unknown if it works on a Mac but it will most definitely break on Windows! Hack away on your platforms and submit a pull request :)

related work

• dropwizard: Dropwizard itself, obviously
• dropwizard-utils: Various DW utils

For a sample project, have a look at stackmagic/gradle-dropwizard-sample

downloading

gradle

the jcenter() shortcut requires at least gradle 1.7

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'net.swisstech:gradle-dropwizard:+'
    }
}

usage

This plugin will add a dropwizardRun task which is similar to jettyRun: it starts the server and blocks until interrupted via Ctrl-C. It will also add a shadowJar task (reusing the plugin com.github.johnrengelman.shadow) to create a shaded jar with merged service files so the jar can be run with java -jar your.jar.

Usage in your project should roughly look like this. See also: gradle-dropwizard-sample.

// you *must* add a configuration for either int/acc tests.
// the naming must match the config below in the dropwizard closure

configurations {
	// dependency configuration for intTest task (task is added by dropwizard plugin)
	intTestCompile

	// dependency configuration for accTest task (task is added by dropwizard plugin)
	accTestCompile
}

// add your dependencies as usual

dependencies {
	// normal main classpath
	compile ...

	// classpath for normal unittests, nothing special here
	testCompile ...

	// classpath for integration tests
	intTestCompile ...

	// classpath for acceptance tests
	accTestCompile ...
}

// redis port (exemplary for starting more processes, see also further belo)
ext.redisPort = 63000

// apply the plugin, enable int/acc tests by assigning a name, if desired

apply plugin: 'net.swisstech.dropwizard'
dropwizard {
	// your implementation of the dropwizard application class
	mainClass               = 'net.swisstech.dropwizardsample.Main'

	// the config file to use when running the server manually or as part of the tests
	dropwizardConfigFile    = 'development.yml'

	// name of the integration tests task, note the matching 'configuration' above.
	// the tasks are only added when the value is set, if it remains null (the default)
	// this task will not be added and/or callable
	integrationTestTaskName = "intTest"

	// name of the acceptance tests task, note the matching 'configuration' above.
	// the tasks are only added when the value is set, if it remains null (the default)
	// this task will not be added and/or callable
	acceptanceTestTaskName  = "accTest"

	// list of jvmArgs to be added, same semantics as JavaExec.jvmArgs(), put your args
	// including '-D' and everything there
	// added in dropwizard-gradle 1.1.6
	jvmArgs                 = [
		  "-DSERVER_VERSION=${project.version}"
		, "-DREDIS_PORT=${project.redisPort}"
	]
}

// run in afterEvaluate since the plugin does the same, plus this must be
// run after the plugin has done it's thing.
// this example uses 2 start/stop tasks so each kind of test would start
// off with a fresh redis instance. if you are fine witch 1 instance for
// both then ditch one of the start and stop tasks and change the dependsOn
// and finalizedBy declarations
afterEvaluate {
	task "intRedisStart" << {
		project.ext.intRedisProcess = net.swisstech.swissarmyknife.sys.linux.BackgroundProcess
			.launch([ 'redis-server', '--port', project.redisPort as String ], null)
			.waitForOpenPorts([ project.redisPort ], 10000)
	}
	task "intRedisStop" << {
		project.intRedisProcess.shutdown()
	}
	tasks.intTest.dependsOn("intRedisStart")
	tasks.intTest.finalizedBy("intRedisStop")

	task "accRedisStart" << {
		project.ext.accRedisProcess = net.swisstech.swissarmyknife.sys.linux.BackgroundProcess
			.launch([ 'redis-server', '--port', project.redisPort as String ], null)
			.waitForOpenPorts([ project.redisPort ], 10000)
	}
	task "accRedisStop" << {
		project.accRedisProcess.shutdown()
	}
	tasks.accTest.dependsOn("accRedisStart")
	tasks.accTest.finalizedBy("accRedisStop")
}

The plugin will add 1 or 2 new test tasks for integration/acceptance testing with user-definable names. These tasks will start dropwizard, then run the tests from the appropriate source set and then stop dropwizard again. Both, integration and acceptance tests are optional.

writing tests

Please note: The test tasks are hard-wired to use TestNG.

Your actual test classes and resources go into src/xyzTests/{java|resources}. Where xyzTests corresponds to the name of your integration/acceptance tasks.

The plugin will read your dropwizard yaml config and parse/reconstruct the urls to access your app/admin ports. This information is added to your tests as a java system property. The available properties depend on your actual configuration. The maximum available properties are:

• DROPWIZARD_APP_HTTP
• DROPWIZARD_APP_HTTPS
• DROPWIZARD_APP_SPDY3
• DROPWIZARD_ADM_HTTP
• DROPWIZARD_ADM_HTTPS
• DROPWIZARD_ADM_SPDY3

An example test to call the hello-world service from the dropwizard getting started project looks something like this:

package net.swisstech;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;

import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

import dwtest.client.HelloWorld;
import dwtest.client.HelloWorldClientFactory;
import dwtest.model.Saying;

public class SomeIntTest {

	@Test
	@Parameters("DROPWIZARD_APP_HTTP")
	public void test(String dwUrl) {
		HelloWorld hw = HelloWorldClientFactory.newClient(dwUrl);
		Saying saying = hw.sayHello("INTEGRATION");
		assertNotNull(saying);
		assertEquals(saying.getContent(), "Hello, INTEGRATION!");
	}
}

When your integrationTestTaskName is configured as intTest, then the above test would be located in src/intTest/java/net/swisstech and can be called trough gradle intTest.

acceptance test jar

In case acceptance tests are enabled, a fat jar is built from the sourceSet/configuration for your acceptance Tests with the TestNG Main class as the jar's main. Simply add a testng.xml like below and you can run java -jar myproject-acceptance.jar testng.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="mysuite" verbose="2">
	<test name="myproject">
		<packages>
			<package name="myproject.acceptance.*" />
		</packages>
	</test>
</suite>

experimental spdy3 support

SPDY3 is supported, since this plugin adds the npn-boot library to the boot classpath of the dropwizard instance being started. However, this feature is not very well tested and it only adds a fairly recent version of the npn-boot library and not the one intended for your jdk (apparently npn-boot is picky about your jdk version). Use this with caution.

todo

• npn-boot jar version selector util
• make usage of TestNG vs. JUnit configurable (need to investigate if and how we can pass in urls to the tests like TestNG does)
• generate testng.xml and a script or Main wrapper that adds all the urls to the environment the same way as it's already done in the int/acc tests so you get a 'portable' jar with a script and can run the acceptance tests on any server as post-deployment tests.
• check if this plugin works on mac
• make this plugin work on windows
• env parameters such as SERVER_VERSION should be configurable and optional

known issues

• integration and acceptance tests are only run if there's at least 1 test class available in src/test/java so always run test intTest or build intTest or anything that includes the test task before your intTest and accTest tasks.