当rest模板有使用Spring boot 1.5.x的拦截器时，我们可以使用@RestClientTest吗？

Question

我使用的是 Spring Boot 1.5.x (Spring 4.2.x)，我创建了一个 RestClientSdk spring 组件类，如下所示：

@Component
public class RestClientSdkImpl implements RestClientSdk {

    private RestTemplate restTemplate;

    @Autowired
    public RestClientSdkImpl(RestTemplateBuilder restTemplateBuilder) {
        this.restTemplate = restTemplateBuilder.build();
    }
    ...
    //other methods kept out for brevity
}

我还定义了一个 DefaultRestTemplateCustomizer 弹簧组件，如下所示：

@Component
public class DefaultRestTemplateCustomizer implements RestTemplateCustomizer {

    private LogClientHttpRequestInterceptor logClientHttpRequestInterceptor;

    @Autowired
    public DefaultRestTemplateCustomizer(LogClientHttpRequestInterceptor logClientHttpRequestInterceptor) {
        this.logClientHttpRequestInterceptor = logClientHttpRequestInterceptor;
    }

    @Override
    public void customize(RestTemplate restTemplate) {
        restTemplate.getInterceptors().add(logClientHttpRequestInterceptor);
        restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(new SimpleClientHttpRequestFactory()));
    }

}

这样，我定义了一个如下所示的测试类，它使用如下所示的@RestClientTest 注解。

@RunWith(SpringRunner.class)
@RestClientTest(RestClientSdk.class)
@ActiveProfiles("test")
/*
 * The RestClientTest only includes the most minimal configuration to include a rest template builder, 
 * so we include the rest sdk auto config within the scope of the test 
 */ 
@ImportAutoConfiguration(RestSdkAutoConfiguration.class)
public class RestClientApplicationBehaviourTest{

    @Autowired
    private RestClientSdk restClientSdk;

    @Autowired
    private MockRestServiceServer mockRestServiceServer;

    /**
     * A simple Http Get that retrieves a JSON document from a rest server and 
     * produces a plain old java object as a response.
     */ 
    @Test
    public void testPlainHttpGet() throws IOException{
        //ARRANGE
        RestClientDto<?> simpleGetRequest = simpleHttpGet();
        mockRestServiceServer.expect(once(), requestTo("http://localhost:8080/account/1234567890"))
                                   .andRespond(withSuccess(IOUtils.getInputAsString("/stubs/account.json"),MediaType.APPLICATION_JSON));
        //ACT
        Account account = restClientSdk.send(simpleGetRequest, Account.class);
        //ASSERT
        mockRestServiceServer.verify();     
        Assert.assertNotNull(account);
        Assert.assertNotNull(account.getAccountId());
        Assert.assertNotNull(account.getFirstName());
        Assert.assertNotNull(account.getLastName());
    }
...
//not including other methods for brevity 
}

---

问题

---

因为 MockRestServiceServer 构建器使用 MockClientHttpRequestFactory 覆盖了我的休息模板中的 BufferingClientHttpRequestFactory，所以我从我的正文中得到一个空响应。这是因为日志拦截器正在读取来自响应的输入流，因此该流不再具有要读取的内容。 BufferingClientHttpRequestFactory 会阻止这种情况发生。现在，我知道从 Spring 5.0.5 开始，MockRestServiceServer 构建器中有一个名为 bufferContent 的额外选项，但我没有选择迁移到 Spring 5.x（Spring Boot 2 .x)，所以我想知道是否有办法使用 Spring Boot 1.5.x / Spring 4.2.x 进行配置。

提前谢谢你！

胡安

Answer 1

为了解决这个问题，我需要定义一个测试配置，这将允许我覆盖客户端请求工厂。请看下面的代码。这有点 hacky，但我想这里真正的解决方案是升级到 Spring 5.x / Spring Boot 2.x。

@Configuration
@Profile("test")
public class MockRestServiceServerConfiguration {

    /**
     * Wrap the Mock Rest client factory in the buffered one.  
     * @param restClientSdk The rest client SDK containing the rest template to use.
     * @return The mock rest service server to use.
     */
    @Bean
    public MockRestServiceServer mockRestServiceServer(RestClientSdkImpl restClientSdkImpl) {
        RestTemplate restTemplate = restClientSdkImpl.getRestTemplate();
        MockRestServiceServer server = MockRestServiceServer.createServer(restTemplate);

        //need to do this because getRequestFactory returns InterceptingHttpRequestFactory wraping the mock rest service server request factory
        List<ClientHttpRequestInterceptor> templateInterceptors = restTemplate.getInterceptors();
        restTemplate.setInterceptors(null);

        //now we wrap the delegate, which should be the mock rest service server request factory 
        BufferingClientHttpRequestFactory bufferingFact = new BufferingClientHttpRequestFactory(restTemplate.getRequestFactory());
        restTemplate.setRequestFactory(bufferingFact);
        restTemplate.setInterceptors(templateInterceptors);
        return server;
    }
}