SpringCloud升级之路2020.0.x版-40. spock 单元测试封装的 WebClient(下)_干货满满张哈希

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本系列代码地址：http://github.com/JoJoTec/spring-cloud-parent

我们继续上一节，继续使用 spock 测试我们自己封装的 WebClient

测试针对 readTimeout 重试

针对响应超时，我们需要验证重试仅针对可以重试的方法（包括 GET 方法以及配置的可重试方法），针对不可重试的方法没有重试。我们可以通过 spock 单元测试中，检查对于负载均衡器获取实例方法的调用次数看出来是否有重试

我们通过 httpbin.org 的 '/delay/秒' 实现 readTimeout，分别验证：

测试 GET 延迟 2 秒返回，超过读取超时，这时候会重试
测试 POST 延迟 3 秒返回，超过读取超时，同时路径在重试路径中，这样也是会重试的
测试 POST 延迟 2 秒返回，超过读取超时，同时路径在重试路径中，这样不会重试

代码如下：

``` @SpringBootTest( properties = [ "webclient.configs.testServiceWithCannotConnect.baseUrl=http://testServiceWithCannotConnect", "webclient.configs.testServiceWithCannotConnect.serviceName=testServiceWithCannotConnect", "webclient.configs.testService.baseUrl=http://testService", "webclient.configs.testService.serviceName=testService", "webclient.configs.testService.responseTimeout=1s", "webclient.configs.testService.retryablePaths[0]=/delay/3", "webclient.configs.testService.retryablePaths[1]=/status/4*", "spring.cloud.loadbalancer.zone=zone1", "resilience4j.retry.configs.default.maxAttempts=3", "resilience4j.circuitbreaker.configs.default.failureRateThreshold=50", "resilience4j.circuitbreaker.configs.default.slidingWindowType=TIME_BASED", "resilience4j.circuitbreaker.configs.default.slidingWindowSize=5", //因为重试是 3 次，为了防止断路器打开影响测试，设置为正好比重试多一次的次数，防止触发 //同时我们在测试的时候也需要手动清空断路器统计 "resilience4j.circuitbreaker.configs.default.minimumNumberOfCalls=4", "resilience4j.circuitbreaker.configs.default.recordExceptions=java.lang.Exception" ], classes = MockConfig ) class WebClientUnitTest extends Specification { @SpringBootApplication static class MockConfig { } @SpringBean private LoadBalancerClientFactory loadBalancerClientFactory = Mock()

@Autowired
private CircuitBreakerRegistry circuitBreakerRegistry
@Autowired
private Tracer tracer
@Autowired
private ServiceInstanceMetrics serviceInstanceMetrics
@Autowired
private WebClientNamedContextFactory webClientNamedContextFactory

//不同的测试方法的类对象不是同一个对象，会重新生成，保证互相没有影响
def zone1Instance1 = new DefaultServiceInstance(instanceId: "instance1", host: "www.httpbin.org", port: 80, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
def zone1Instance2 = new DefaultServiceInstance(instanceId: "instance2", host: "www.httpbin.org", port: 8081, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
def zone1Instance3 = new DefaultServiceInstance(instanceId: "instance3", host: "httpbin.org", port: 80, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
RoundRobinWithRequestSeparatedPositionLoadBalancer loadBalancerClientFactoryInstance = Spy();
ServiceInstanceListSupplier serviceInstanceListSupplier = Spy();

//所有测试的方法执行前会调用的方法
def setup() {
    //初始化 loadBalancerClientFactoryInstance 负载均衡器
    loadBalancerClientFactoryInstance.setTracer(tracer)
    loadBalancerClientFactoryInstance.setServiceInstanceMetrics(serviceInstanceMetrics)
    loadBalancerClientFactoryInstance.setServiceInstanceListSupplier(serviceInstanceListSupplier)
}

def "测试针对 readTimeout 重试"() {
    given: "设置 testService 的实例都是正常实例"
        loadBalancerClientFactory.getInstance("testService") >> loadBalancerClientFactoryInstance
        serviceInstanceListSupplier.get() >> Flux.just(Lists.newArrayList(zone1Instance1, zone1Instance3))
    when: "测试 GET 延迟 2 秒返回，超过读取超时"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .get().uri("/delay/2").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientRequestException e) {
            if (e.getCause() in  ReadTimeoutException) {
                //读取超时忽略
            } else {
                throw e;
            }
        }
    then: "每次都会超时所以会重试，根据配置一共有 3 次"
        3 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
    when: "测试 POST 延迟 3 秒返回，超过读取超时，同时路径在重试路径中"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .post().uri("/delay/3").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientRequestException e) {
            if (e.getCause() in  ReadTimeoutException) {
                //读取超时忽略
            } else {
                throw e;
            }
        }
    then: "每次都会超时所以会重试，根据配置一共有 3 次"
        3 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
    when: "测试 POST 延迟 2 秒返回，超过读取超时，这个不能重试"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .post().uri("/delay/2").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientRequestException e) {
            if (e.getCause() in  ReadTimeoutException) {
                //读取超时忽略
            } else {
                throw e;
            }
        }
    then: "没有重试，只有一次调用"
        1 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
}

} ```

测试非 2xx 响应码返回的重试

对于非 2xx 的响应码，代表请求失败，我们需要测试： - 测试 GET 返回 500，会有重试 - 测试 POST 返回 500，没有重试 - 测试 POST 返回 400，这个请求路径在重试路径中，会有重试

@Autowired
private CircuitBreakerRegistry circuitBreakerRegistry
@Autowired
private Tracer tracer
@Autowired
private ServiceInstanceMetrics serviceInstanceMetrics
@Autowired
private WebClientNamedContextFactory webClientNamedContextFactory

//不同的测试方法的类对象不是同一个对象，会重新生成，保证互相没有影响
def zone1Instance1 = new DefaultServiceInstance(instanceId: "instance1", host: "www.httpbin.org", port: 80, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
def zone1Instance2 = new DefaultServiceInstance(instanceId: "instance2", host: "www.httpbin.org", port: 8081, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
def zone1Instance3 = new DefaultServiceInstance(instanceId: "instance3", host: "httpbin.org", port: 80, metadata: Map.ofEntries(Map.entry("zone", "zone1")))
RoundRobinWithRequestSeparatedPositionLoadBalancer loadBalancerClientFactoryInstance = Spy();
ServiceInstanceListSupplier serviceInstanceListSupplier = Spy();

//所有测试的方法执行前会调用的方法
def setup() {
    //初始化 loadBalancerClientFactoryInstance 负载均衡器
    loadBalancerClientFactoryInstance.setTracer(tracer)
    loadBalancerClientFactoryInstance.setServiceInstanceMetrics(serviceInstanceMetrics)
    loadBalancerClientFactoryInstance.setServiceInstanceListSupplier(serviceInstanceListSupplier)
}

def "测试非 200 响应码返回" () {
    given: "设置 testService 的实例都是正常实例"
        loadBalancerClientFactory.getInstance("testService") >> loadBalancerClientFactoryInstance
        serviceInstanceListSupplier.get() >> Flux.just(Lists.newArrayList(zone1Instance1, zone1Instance3))
    when: "测试 GET 返回 500"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .get().uri("/status/500").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientResponseException e) {
            if (e.getStatusCode().is5xxServerError()) {
                //5xx忽略
            } else {
                throw e;
            }
        }
    then: "每次都没有返回 2xx 所以会重试，根据配置一共有 3 次"
        3 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
    when: "测试 POST 返回 500"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .post().uri("/status/500").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientResponseException e) {
            if (e.getStatusCode().is5xxServerError()) {
                //5xx忽略
            } else {
                throw e;
            }
        }
    then: "POST 默认不重试，所以只会调用一次"
        1 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
    when: "测试 POST 返回 400，这个请求路径在重试路径中"
        //清除断路器影响
        circuitBreakerRegistry.getAllCircuitBreakers().forEach({ c -> c.reset() })
        try {
            webClientNamedContextFactory.getWebClient("testService")
                                        .post().uri("/status/400").retrieve()
                                        .bodyToMono(String.class).block();
        } catch (WebClientResponseException e) {
            if (e.getStatusCode().is4xxClientError()) {
                //4xx忽略
            } else {
                throw e;
            }
        }
    then: "路径在重试路径中，所以会重试"
        3 * loadBalancerClientFactoryInstance.getInstanceResponseByRoundRobin(*_)
}

} ```

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