94. Customization

Tip

本部分仅对 Groovy DSL 有效

您可以通过扩展 DSL 来定制 Spring Cloud Contract Verifier,如本节其余部分所示。

94.1 扩展 DSL

您可以为 DSL 提供自己的功能。此功能的关键要求是保持静态兼容性。在本文档的后面,您可以看到以下示例:

  • 创建具有可重用类的 JAR。

  • 在 DSL 中引用这些类。

您可以找到完整的示例here

94.1.1 通用 JAR

以下示例显示了可以在 DSL 中重用的三个类。

PatternUtils 包含 consumerproducer 所使用的函数。

package com.example;

import java.util.regex.Pattern;

/**
 * If you want to use {@link Pattern} directly in your tests
 * then you can create a class resembling this one. It can
 * contain all the {@link Pattern} you want to use in the DSL.
 *
 * <pre>
 * {@code
 * request {
 *     body(
 *         [ age: $(c(PatternUtils.oldEnough()))]
 *     )
 * }
 * </pre>
 *
 * Notice that we're using both {@code $()} for dynamic values
 * and {@code c()} for the consumer side.
 *
 * @author Marcin Grzejszczak
 */
//tag::impl[]
public class PatternUtils {

	public static String tooYoung() {
		//remove::start[]
		return "[0-1][0-9]";
		//remove::end[return]
	}

	public static Pattern oldEnough() {
		//remove::start[]
		return Pattern.compile("[2-9][0-9]");
		//remove::end[return]
	}

	/**
	 * Makes little sense but it's just an example ;)
	 */
	public static Pattern ok() {
		//remove::start[]
		return Pattern.compile("OK");
		//remove::end[return]
	}
}
//end::impl[]

ConsumerUtils 包含 consumer 使用的功能。

package com.example;

import org.springframework.cloud.contract.spec.internal.ClientDslProperty;

/**
 * DSL Properties passed to the DSL from the consumer's perspective.
 * That means that on the input side {@code Request} for HTTP
 * or {@code Input} for messaging you can have a regular expression.
 * On the {@code Response} for HTTP or {@code Output} for messaging
 * you have to have a concrete value.
 *
 * @author Marcin Grzejszczak
 */
//tag::impl[]
public class ConsumerUtils {
	/**
	 * Consumer side property. By using the {@link ClientDslProperty}
	 * you can omit most of boilerplate code from the perspective
	 * of dynamic values. Example
	 *
	 * <pre>
	 * {@code
	 * request {
	 *     body(
	 *         [ age: $(ConsumerUtils.oldEnough())]
	 *     )
	 * }
	 * </pre>
	 *
	 * That way it's in the implementation that we decide what value we will pass to the consumer
	 * and which one to the producer.
	 *
	 * @author Marcin Grzejszczak
	 */
	public static ClientDslProperty oldEnough() {
		//remove::start[]
		// this example is not the best one and
		// theoretically you could just pass the regex instead of `ServerDslProperty` but
		// it's just to show some new tricks :)
		return new ClientDslProperty(PatternUtils.oldEnough(), 40);
		//remove::end[return]
	}

}
//end::impl[]

ProducerUtils 包含 producer 使用的功能。

package com.example;

import org.springframework.cloud.contract.spec.internal.ServerDslProperty;

/**
 * DSL Properties passed to the DSL from the producer's perspective.
 * That means that on the input side {@code Request} for HTTP
 * or {@code Input} for messaging you have to have a concrete value.
 * On the {@code Response} for HTTP or {@code Output} for messaging
 * you can have a regular expression.
 *
 * @author Marcin Grzejszczak
 */
//tag::impl[]
public class ProducerUtils {

	/**
	 * Producer side property. By using the {@link ProducerUtils}
	 * you can omit most of boilerplate code from the perspective
	 * of dynamic values. Example
	 *
	 * <pre>
	 * {@code
	 * response {
	 *     body(
	 *         [ status: $(ProducerUtils.ok())]
	 *     )
	 * }
	 * </pre>
	 *
	 * That way it's in the implementation that we decide what value we will pass to the consumer
	 * and which one to the producer.
	 */
	public static ServerDslProperty ok() {
		// this example is not the best one and
		// theoretically you could just pass the regex instead of `ServerDslProperty` but
		// it's just to show some new tricks :)
		return new ServerDslProperty( PatternUtils.ok(), "OK");
	}
}
//end::impl[]

94.1.2 向项目添加依赖项

为了使插件和 IDE 能够引用常见的 JAR 类,您需要将依赖项传递给您的项目。

94.1.3 在项目的依存关系中测试依存关系

首先,添加公共 jar 依赖项作为测试依赖项。因为您的 Contract 文件在测试资源路径上可用,所以常见的 jar 类自动在 Groovy 文件中变为可见。以下示例显示如何测试依赖关系:

Maven.

<dependency>
	<groupId>com.example</groupId>
	<artifactId>beer-common</artifactId>
	<version>${project.version}</version>
	<scope>test</scope>
</dependency>

Gradle.

testCompile("com.example:beer-common:0.0.1.BUILD-SNAPSHOT")

94.1.4 在插件的依赖关系中测试依赖关系

现在,必须添加插件的依赖关系,以便在运行时重用,如以下示例所示:

Maven.

<plugin>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-contract-maven-plugin</artifactId>
	<version>${spring-cloud-contract.version}</version>
	<extensions>true</extensions>
	<configuration>
		<packageWithBaseClasses>com.example</packageWithBaseClasses>
		<baseClassMappings>
			<baseClassMapping>
				<contractPackageRegex>.*intoxication.*</contractPackageRegex>
				<baseClassFQN>com.example.intoxication.BeerIntoxicationBase</baseClassFQN>
			</baseClassMapping>
		</baseClassMappings>
	</configuration>
	<dependencies>
		<dependency>
			<groupId>com.example</groupId>
			<artifactId>beer-common</artifactId>
			<version>${project.version}</version>
			<scope>compile</scope>
		</dependency>
	</dependencies>
</plugin>

Gradle.

classpath "com.example:beer-common:0.0.1.BUILD-SNAPSHOT"

94.1.5 在 DSL 中引用类

现在,您可以在 DSL 中引用您的类,如以下示例所示:

package contracts.beer.rest

import com.example.ConsumerUtils
import com.example.ProducerUtils
import org.springframework.cloud.contract.spec.Contract

Contract.make {
	description("""
Represents a successful scenario of getting a beer

given:
Client 够老了
when:
他申请啤酒
then:
我们给他啤酒


""")
	request {
		method 'POST'
		url '/check'
		body(
				age: $(ConsumerUtils.oldEnough())
		)
		headers {
			contentType(applicationJson())
		}
	}
	response {
		status 200
		body("""
			{
				"status": "${value(ProducerUtils.ok())}"
			}
			""")
		headers {
			contentType(applicationJson())
		}
	}
}

Tip

您可以通过将convertToYaml设置为true来设置 Spring Cloud Contract 插件。这样,您将不必将具有扩展功能的依赖项添加到使用方,因为使用方将使用 YAMLContract 而不是 GroovyContract。