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
@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(*_)
}
}微信搜索“我的编程喵”关注公众号，每日一刷，轻松提升技术，斩获各种offer：
