88. 定制

本节仅适用于 Groovy DSL

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

88.1 扩展 DSL

您可以为 DSL 提供自己的功能。此 feature 的 key 要求是保持静态兼容性。在本文档的后面部分，您可以看到以下示例：

• 使用可重用的 classes 创建 JAR。

• 在 DSL 中引用这些 classes。

你可以找到完整的 example 这里。

88.1.1 Common JAR

以下示例显示了可在 DSL 中重用的三个 classes。

PatternUtils包含consumer和producer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使用的函数。

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使用的函数。

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[]

88.1.2 将依赖项添加到项目中

在插件中，为了能够_remon common JAR classes，IDE 需要将依赖项传递给项目。

88.1.3 测试项目依赖关系中的依赖关系

首先，将 common jar 依赖项添加为测试依赖项。由于 contracts files 在测试资源路径上可用，因此 common jar classes 会自动在 Groovy files 中可见。以下示例显示如何测试依赖项：

Maven 的.

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

摇篮.

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

88.1.4 在插件的依赖关系中测试依赖关系

现在，您必须添加插件的依赖项以在运行时重用，如下面的示例所示：

Maven 的.

<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>

摇篮.

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

88.1.5 在 DSL 中引用 classes

您现在可以在 DSL 中引用您的 classes，如下面的示例所示：

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

给定：
client 足够老了
什么时候：
他申请了啤酒
然后：
我们会给他啤酒

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