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Set up load-balanced RestClient.Builder with deferring postprocessor.

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This commit is contained in:
Olga MaciaszekSharma
2024-02-19 16:37:19 +01:00
parent 7d71798f22
commit d75ed99df9
9 changed files with 138 additions and 46 deletions
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30
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/BlockingLoadBalancerInterceptor.java Normal file
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@@ -0,0 +1,30 @@
/*
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.client.loadbalancer;
import org.springframework.http.client.ClientHttpRequestInterceptor;
/**
* A marker interface for {@link ClientHttpRequestInterceptor} instances used for
* load-balancing.
*
* @author Olga Maciaszek-Sharma
* @since 4.1.2
*/
public interface BlockingLoadBalancerInterceptor extends ClientHttpRequestInterceptor {
}

68
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/DeferringLoadBalancerInterceptor.java Normal file
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@@ -0,0 +1,68 @@
/*
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.client.loadbalancer;
import java.io.IOException;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
/**
* An {@link ClientHttpRequestInterceptor} implementation that uses {@link ObjectProvider}
* to resolve appropriate {@link BlockingLoadBalancerInterceptor} delegate when the
* {@link ClientHttpRequestInterceptor#intercept(HttpRequest, byte[], ClientHttpRequestExecution)}
* method is first called.
*
* @author Olga Maciaszek-Sharma
* @since 4.1.2
*/
public class DeferringLoadBalancerInterceptor implements ClientHttpRequestInterceptor {
private final ObjectProvider<BlockingLoadBalancerInterceptor> loadBalancerInterceptorProvider;
private BlockingLoadBalancerInterceptor delegate;
public DeferringLoadBalancerInterceptor(
ObjectProvider<BlockingLoadBalancerInterceptor> loadBalancerInterceptorProvider) {
this.loadBalancerInterceptorProvider = loadBalancerInterceptorProvider;
}
@Override
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)
throws IOException {
tryResolveDelegate();
return delegate.intercept(request, body, execution);
}
private void tryResolveDelegate() {
if (delegate == null) {
delegate = loadBalancerInterceptorProvider.getIfAvailable();
if (delegate == null) {
throw new IllegalStateException("LoadBalancer interceptor not available.");
}
}
}
// Visible for tests
ObjectProvider<BlockingLoadBalancerInterceptor> getLoadBalancerInterceptorProvider() {
return loadBalancerInterceptorProvider;
}
}

57
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/LoadBalancerAutoConfiguration.java
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@@ -33,12 +33,12 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.retry.support.RetryTemplate;
import org.springframework.web.client.RestClient;
import org.springframework.web.client.RestTemplate;
/**
@@ -60,10 +60,6 @@ public class LoadBalancerAutoConfiguration {
@Autowired(required = false)
private List<RestTemplate> restTemplates = Collections.emptyList();
@LoadBalanced
@Autowired(required = false)
private List<RestClient.Builder> restClientBuilders = Collections.emptyList();
@Autowired(required = false)
private List<LoadBalancerRequestTransformer> transformers = Collections.emptyList();
@@ -79,26 +75,33 @@ public class LoadBalancerAutoConfiguration {
});
}
@Bean
public SmartInitializingSingleton loadBalancedRestClientBuilderInitializer(
ObjectProvider<List<RestClientBuilderCustomizer>> restClientBuilderCustomizers) {
return () -> restClientBuilderCustomizers.ifAvailable(customizers -> {
for (RestClient.Builder restClientBuilder : restClientBuilders) {
for (RestClientBuilderCustomizer customizer : customizers) {
customizer.customize(restClientBuilder);
}
}
});
}
@Bean
@ConditionalOnMissingBean
public LoadBalancerRequestFactory loadBalancerRequestFactory(LoadBalancerClient loadBalancerClient) {
return new LoadBalancerRequestFactory(loadBalancerClient, transformers);
}
@Configuration(proxyBeanMethods = false)
@AutoConfiguration
static class DeferringLoadBalancerInterceptorConfig {
@Bean
@ConditionalOnMissingBean
public DeferringLoadBalancerInterceptor deferringLoadBalancerInterceptor(
ObjectProvider<BlockingLoadBalancerInterceptor> loadBalancerInterceptorObjectProvider) {
return new DeferringLoadBalancerInterceptor(loadBalancerInterceptorObjectProvider);
}
@Bean
@ConditionalOnBean(DeferringLoadBalancerInterceptor.class)
@ConditionalOnMissingBean
LoadBalancerRestClientBuilderBeanPostProcessor lbRestClientPostProcessor(
DeferringLoadBalancerInterceptor loadBalancerInterceptor, ApplicationContext context) {
return new LoadBalancerRestClientBuilderBeanPostProcessor(loadBalancerInterceptor, context);
}
}
@AutoConfiguration
@Conditional(RetryMissingOrDisabledCondition.class)
static class LoadBalancerInterceptorConfig {
@@ -118,13 +121,6 @@ public class LoadBalancerAutoConfiguration {
};
}
@Bean
@ConditionalOnMissingBean
public RestClientBuilderCustomizer restClientBuilderCustomizer(
LoadBalancerInterceptor loadBalancerInterceptor) {
return restClientBuilder -> restClientBuilder.requestInterceptor(loadBalancerInterceptor);
}
}
private static class RetryMissingOrDisabledCondition extends AnyNestedCondition {
@@ -148,7 +144,7 @@ public class LoadBalancerAutoConfiguration {
/**
* Auto configuration for retry mechanism.
*/
@Configuration(proxyBeanMethods = false)
@AutoConfiguration
@ConditionalOnClass(RetryTemplate.class)
public static class RetryAutoConfiguration {
@@ -189,13 +185,6 @@ public class LoadBalancerAutoConfiguration {
};
}
@Bean
@ConditionalOnMissingBean
public RestClientBuilderCustomizer restClientBuilderCustomizer(
RetryLoadBalancerInterceptor loadBalancerInterceptor) {
return restClientBuilder -> restClientBuilder.requestInterceptor(loadBalancerInterceptor);
}
}
}

3
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/LoadBalancerInterceptor.java
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@@ -21,7 +21,6 @@ import java.net.URI;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.util.Assert;
@@ -31,7 +30,7 @@ import org.springframework.util.Assert;
* @author Ryan Baxter
* @author William Tran
*/
public class LoadBalancerInterceptor implements ClientHttpRequestInterceptor {
public class LoadBalancerInterceptor implements BlockingLoadBalancerInterceptor {
private final LoadBalancerClient loadBalancer;

2
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/LoadBalancerRestClientBuilderBeanPostProcessor.java
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@@ -28,9 +28,7 @@ import org.springframework.web.client.RestClient;
*
* @author Olga Maciaszek-Sharma
* @since 4.1.0
* @deprecated to be removed in the next release.
*/
@Deprecated(forRemoval = true)
public class LoadBalancerRestClientBuilderBeanPostProcessor implements BeanPostProcessor {
private final ClientHttpRequestInterceptor loadBalancerInterceptor;

2
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/RestClientBuilderCustomizer.java
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@@ -25,7 +25,9 @@ import org.springframework.web.client.RestClient;
*
* @author Olga Maciaszek-Sharma
* @since 4.1.1
* @deprecated to be removed in the next major release.
*/
@Deprecated(forRemoval = true)
public interface RestClientBuilderCustomizer {
void customize(RestClient.Builder restClientBuilder);

5
spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/RetryLoadBalancerInterceptor.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2012-2020 the original author or authors.
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -28,7 +28,6 @@ import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.retry.RetryListener;
import org.springframework.retry.backoff.BackOffPolicy;
@@ -45,7 +44,7 @@ import org.springframework.util.StreamUtils;
* @author Olga Maciaszek-Sharma
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public class RetryLoadBalancerInterceptor implements ClientHttpRequestInterceptor {
public class RetryLoadBalancerInterceptor implements BlockingLoadBalancerInterceptor {
private static final Log LOG = LogFactory.getLog(RetryLoadBalancerInterceptor.class);

7
spring-cloud-commons/src/test/java/org/springframework/cloud/client/loadbalancer/LoadBalancerAutoConfigurationTests.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2012-2023 the original author or authors.
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -45,7 +45,10 @@ public class LoadBalancerAutoConfigurationTests extends AbstractLoadBalancerAuto
protected void assertLoadBalanced(RestClient.Builder restClientBuilder) {
restClientBuilder.requestInterceptors(interceptors -> {
assertThat(interceptors).hasSize(1);
assertThat(interceptors.get(0)).isInstanceOf(LoadBalancerInterceptor.class);
assertThat(interceptors.get(0)).isInstanceOf(DeferringLoadBalancerInterceptor.class);
DeferringLoadBalancerInterceptor interceptor = (DeferringLoadBalancerInterceptor) interceptors.get(0);
assertThat(interceptor.getLoadBalancerInterceptorProvider().getObject())
.isInstanceOf(LoadBalancerInterceptor.class);
});
}

10
spring-cloud-commons/src/test/java/org/springframework/cloud/client/loadbalancer/RetryLoadBalancerAutoConfigurationTests.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2012-2020 the original author or authors.
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -46,7 +46,7 @@ public class RetryLoadBalancerAutoConfigurationTests extends AbstractLoadBalance
protected void assertLoadBalanced(RestClient.Builder restClientBuilder) {
restClientBuilder.requestInterceptors(interceptors -> {
assertThat(interceptors).hasSize(1);
assertThat(interceptors.get(0)).isInstanceOf(RetryLoadBalancerInterceptor.class);
assertThat(interceptors.get(0)).isInstanceOf(DeferringLoadBalancerInterceptor.class);
});
}
@@ -72,7 +72,11 @@ public class RetryLoadBalancerAutoConfigurationTests extends AbstractLoadBalance
restClientBuilder.requestInterceptors(interceptors -> {
assertThat(interceptors).hasSize(1);
assertThat(interceptors.get(0)).isInstanceOf(LoadBalancerInterceptor.class);
assertThat(interceptors.get(0)).isInstanceOf(DeferringLoadBalancerInterceptor.class);
DeferringLoadBalancerInterceptor interceptor = (DeferringLoadBalancerInterceptor) interceptors
.get(0);
assertThat(interceptor.getLoadBalancerInterceptorProvider().getObject())
.isInstanceOf(LoadBalancerInterceptor.class);
});
});
}