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2018 iT 邦幫忙鐵人賽
DAY 29
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consumer 消費者

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>customer-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demo</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Dalston.SR4</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-contract-stub-runner</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

要注意的只有記得引入 spring-cloud-starter-contract-stub-runner 依賴

測試時
CustcomerClientTest.java

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.contract.stubrunner.spring.AutoConfigureStubRunner;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.client.RestTemplate;

import static org.junit.Assert.assertEquals;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureStubRunner(ids = {"com.example:customer-service:+:8866"}, workOffline = true)
public class CustcomerClientTest {

    @Autowired
    private RestTemplate restTemplate;

    @Test
    public void testGetCustomers() {
        ParameterizedTypeReference<Page> ptf =
                new ParameterizedTypeReference<Page>() {
                };
        ResponseEntity<Page> responseEntity =
                restTemplate.exchange("http://localhost:8866/api/customers", HttpMethod.GET, null, ptf);
        assertEquals("size error!", 2, responseEntity.getBody().getData().size());
    }
}

只要在註解 AutoConfigureStubRunner ids 標記你要啟動那些服務的 stub,
格式是長這樣 groupId:artifactId:version:classifier:port

之後沒有遠端的服務也可以正常測試了

workOffline = true 是指使用本地 maven 庫,不要使用線上的版本,所以你只要把 Consumer 在你本機上 install 過就可以了

參考資料:
https://github.com/spring-cloud/spring-cloud-contract
http://cloud.spring.io/spring-cloud-static/Dalston.SR4/multi/multi__spring_cloud_contract_stub_runner.html
https://spring.io/blog/2017/10/25/spring-tips-spring-cloud-contract-http
技术干货 | 消费者驱动契约(CDC) 之 SpringCloud Contracts
Marcin Grzejszczak访谈:Spring Cloud Contract


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Day 28 - 服務合約驗證 Cloud Contract Verifier
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Day 30 - SpringBoot 2.0 跟發展
系列文
30天從零開始 使用 Spring Boot 跟 Spring Cloud 建構完整微服務架構35

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