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new 909704f3e4 [type:bugfix]Add more retry strategies (#5969)
909704f3e4 is described below
commit 909704f3e4bafdd5b48f81540f27633b9233cb10
Author: JerryDtj <[email protected]>
AuthorDate: Wed Apr 2 10:24:24 2025 +0800
[type:bugfix]Add more retry strategies (#5969)
* 添加重试策略
* http请求重试策略重构
* http请求重试策略重构,添加Customer,retryBackOff,fixed三种策略
* http请求重试策略重构,添加Customer,retryBackOff,fixed三种策略
* http请求重试策略重构,添加Customer,retryBackOff,fixed三种策略
* 修复格式
* 中文转英文
* add license header
* add license header
* add license header
* add license header
* 修复代码格式化问题
* fix testFixedRetryStrategyExecute bug
---------
Co-authored-by: aias00 <[email protected]>
---
.../apache/shenyu/common/constant/Constants.java | 6 +-
.../common/enums/HttpRetryBackoffSpecEnum.java | 68 ++++++++++
.../httpclient/AbstractHttpClientPlugin.java | 119 +++++-------------
.../plugin/httpclient/CustomRetryStrategy.java | 52 ++++++++
.../plugin/httpclient/DefaultRetryStrategy.java | 137 +++++++++++++++++++++
.../ExponentialRetryBackoffStrategy.java | 72 +++++++++++
.../plugin/httpclient/FixedRetryStrategy.java | 61 +++++++++
.../shenyu/plugin/httpclient/RetryStrategy.java | 42 +++++++
.../plugin/httpclient/RetryStrategyTest.java | 105 ++++++++++++++++
9 files changed, 571 insertions(+), 91 deletions(-)
diff --git
a/shenyu-common/src/main/java/org/apache/shenyu/common/constant/Constants.java
b/shenyu-common/src/main/java/org/apache/shenyu/common/constant/Constants.java
index 0e8392d8c6..62bfd1c399 100644
---
a/shenyu-common/src/main/java/org/apache/shenyu/common/constant/Constants.java
+++
b/shenyu-common/src/main/java/org/apache/shenyu/common/constant/Constants.java
@@ -965,7 +965,11 @@ public interface Constants {
* The constant Content-Encoding.
*/
String CONTENT_ENCODING = "Content-Encoding";
-
+ /**
+ * Http request retry policy.
+ */
+ String HTTP_RETRY_BACK_OFF_SPEC = "default";
+
/**
* The constant Content.
*/
diff --git
a/shenyu-common/src/main/java/org/apache/shenyu/common/enums/HttpRetryBackoffSpecEnum.java
b/shenyu-common/src/main/java/org/apache/shenyu/common/enums/HttpRetryBackoffSpecEnum.java
new file mode 100644
index 0000000000..f3583503e9
--- /dev/null
+++
b/shenyu-common/src/main/java/org/apache/shenyu/common/enums/HttpRetryBackoffSpecEnum.java
@@ -0,0 +1,68 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.common.enums;
+
+import java.util.Arrays;
+
+/**
+ * The http scheme enum.
+ */
+public enum HttpRetryBackoffSpecEnum {
+
+ /**
+ * Default retry.
+ */
+ DEFAULT_BACKOFF("default"),
+
+ /**
+ * Fixed retry.
+ */
+ FIXED_BACKOFF("fixed"),
+
+ /**
+ * Exponential retry.
+ */
+ EXPONENTIAL_BACKOFF("exponential"),
+
+ /**
+ * Custom retry.
+ */
+ CUSTOM_BACKOFF("custom");
+
+ private final String name;
+
+
+ HttpRetryBackoffSpecEnum(final String name) {
+ this.name = name;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public static HttpRetryBackoffSpecEnum acquireByName(final String name) {
+ return Arrays.stream(HttpRetryBackoffSpecEnum.values())
+ .filter(e -> e.getName().equals(name)).findFirst()
+ .orElse(HttpRetryBackoffSpecEnum.DEFAULT_BACKOFF);
+ }
+
+ public static String getDefault() {
+ return DEFAULT_BACKOFF.getName();
+ }
+
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/AbstractHttpClientPlugin.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/AbstractHttpClientPlugin.java
index a81ba42d92..845585407d 100644
---
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/AbstractHttpClientPlugin.java
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/AbstractHttpClientPlugin.java
@@ -17,28 +17,31 @@
package org.apache.shenyu.plugin.httpclient;
-import com.google.common.collect.Sets;
-import io.netty.channel.ConnectTimeoutException;
-import io.netty.handler.timeout.ReadTimeoutException;
+import java.net.URI;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.TimeoutException;
+import java.util.function.Function;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.shenyu.common.constant.Constants;
import org.apache.shenyu.common.enums.HeaderUniqueStrategyEnum;
+import org.apache.shenyu.common.enums.HttpRetryBackoffSpecEnum;
import org.apache.shenyu.common.enums.RetryEnum;
import org.apache.shenyu.common.enums.UniqueHeaderEnum;
import org.apache.shenyu.common.exception.ShenyuException;
import org.apache.shenyu.common.utils.LogUtils;
-import org.apache.shenyu.loadbalancer.cache.UpstreamCacheManager;
-import org.apache.shenyu.loadbalancer.entity.Upstream;
-import org.apache.shenyu.loadbalancer.factory.LoadBalancerFactory;
import org.apache.shenyu.plugin.api.ShenyuPlugin;
import org.apache.shenyu.plugin.api.ShenyuPluginChain;
import org.apache.shenyu.plugin.api.context.ShenyuContext;
import org.apache.shenyu.plugin.api.result.ShenyuResultEnum;
import org.apache.shenyu.plugin.api.result.ShenyuResultWrap;
-import org.apache.shenyu.plugin.api.utils.RequestUrlUtils;
import org.apache.shenyu.plugin.api.utils.WebFluxResultUtils;
-import org.apache.shenyu.plugin.httpclient.exception.ShenyuTimeoutException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.buffer.DataBuffer;
@@ -48,21 +51,7 @@ import
org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
-import reactor.util.retry.Retry;
-import reactor.util.retry.RetryBackoffSpec;
-import java.net.URI;
-import java.time.Duration;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.TimeoutException;
-import java.util.function.Function;
-import java.util.stream.Collectors;
/**
* The type abstract http client plugin.
@@ -88,80 +77,30 @@ public abstract class AbstractHttpClientPlugin<R>
implements ShenyuPlugin {
final Mono<R> response = doRequest(exchange,
exchange.getRequest().getMethod().name(), uri, exchange.getRequest().getBody())
.timeout(duration, Mono.error(() -> new
TimeoutException("Response took longer than timeout: " + duration)))
.doOnError(e -> LOG.error(e.getMessage(), e));
- if (RetryEnum.CURRENT.getName().equals(retryStrategy)) {
- //old version of DividePlugin and SpringCloudPlugin will run on
this
- RetryBackoffSpec retryBackoffSpec = Retry.backoff(retryTimes,
Duration.ofMillis(20L))
- .maxBackoff(Duration.ofSeconds(20L))
- .transientErrors(true)
- .jitter(0.5d)
- .filter(t -> t instanceof TimeoutException || t instanceof
ConnectTimeoutException
- || t instanceof ReadTimeoutException || t
instanceof IllegalStateException)
- .onRetryExhaustedThrow((retryBackoffSpecErr, retrySignal)
-> {
- throw new ShenyuTimeoutException("Request timeout, the
maximum number of retry times has been exceeded");
- });
- return response.retryWhen(retryBackoffSpec)
- .onErrorMap(ShenyuTimeoutException.class, th -> new
ResponseStatusException(HttpStatus.REQUEST_TIMEOUT, th.getMessage(), th))
- .onErrorMap(TimeoutException.class, th -> new
ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th))
- .flatMap((Function<Object, Mono<? extends Void>>) o ->
chain.execute(exchange));
+ RetryStrategy<R> strategy;
+ //Is it better to go with the configuration file here?
+ String retryStrategyType = (String)
Optional.ofNullable(exchange.getAttribute(Constants.HTTP_RETRY_BACK_OFF_SPEC)).orElse(HttpRetryBackoffSpecEnum.getDefault());
+ switch (retryStrategyType) {
+ case "exponential":
+ strategy = new ExponentialRetryBackoffStrategy<>(this);
+ break;
+ case "fixed":
+ strategy = new FixedRetryStrategy<>(this);
+ break;
+ case "custom":
+ strategy = new CustomRetryStrategy<>(this);
+ break;
+ default:
+ strategy = new DefaultRetryStrategy<>(this);
}
- final Set<URI> exclude = Sets.newHashSet(uri);
- return resend(response, exchange, duration, exclude, retryTimes)
+ Mono<R> retriedResponse = strategy.execute(response, exchange,
duration, retryTimes);
+ return retriedResponse
.onErrorMap(ShenyuException.class, th -> new
ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE,
ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER.getMsg(), th))
- .onErrorMap(TimeoutException.class, th -> new
ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th))
+ .onErrorMap(java.util.concurrent.TimeoutException.class, th ->
new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th))
.flatMap((Function<Object, Mono<? extends Void>>) o ->
chain.execute(exchange));
}
- private Mono<R> resend(final Mono<R> clientResponse,
- final ServerWebExchange exchange,
- final Duration duration,
- final Set<URI> exclude,
- final int retryTimes) {
- Mono<R> result = clientResponse;
- for (int i = 0; i < retryTimes; i++) {
- result = resend(result, exchange, duration, exclude);
- }
- return result;
- }
-
- private Mono<R> resend(final Mono<R> response,
- final ServerWebExchange exchange,
- final Duration duration,
- final Set<URI> exclude) {
- // does it necessary to add backoff interval time ?
- return response.onErrorResume(th -> {
- final String selectorId =
exchange.getAttribute(Constants.DIVIDE_SELECTOR_ID);
- final String loadBalance =
exchange.getAttribute(Constants.LOAD_BALANCE);
- //always query the latest available list
- final List<Upstream> upstreamList =
UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selectorId)
- .stream().filter(data -> {
- final String trimUri = data.getUrl().trim();
- for (URI needToExclude : exclude) {
- // exclude already called
- if ((needToExclude.getHost() + ":" +
needToExclude.getPort()).equals(trimUri)) {
- return false;
- }
- }
- return true;
- }).collect(Collectors.toList());
- if (CollectionUtils.isEmpty(upstreamList)) {
- // no need to retry anymore
- return Mono.error(new
ShenyuException(ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER.getMsg()));
- }
- final String ip =
Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();
- final Upstream upstream =
LoadBalancerFactory.selector(upstreamList, loadBalance, ip);
- if (Objects.isNull(upstream)) {
- // no need to retry anymore
- return Mono.error(new
ShenyuException(ShenyuResultEnum.CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER.getMsg()));
- }
- final URI newUri = RequestUrlUtils.buildRequestUri(exchange,
upstream.buildDomain());
- // in order not to affect the next retry call, newUri needs to be
excluded
- exclude.add(newUri);
- return doRequest(exchange,
exchange.getRequest().getMethod().name(), newUri,
exchange.getRequest().getBody())
- .timeout(duration, Mono.error(() -> new
TimeoutException("Response took longer than timeout: " + duration)))
- .doOnError(e -> LOG.error(e.getMessage(), e));
- });
- }
/**
* Process the Web request.
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/CustomRetryStrategy.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/CustomRetryStrategy.java
new file mode 100644
index 0000000000..ffa782bc28
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/CustomRetryStrategy.java
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+import java.time.Duration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+/**
+ * Custom retry policy.
+ * Also please achieve your own
+ *@Date 2025/3/23 14:27
+ */
+public class CustomRetryStrategy<R> implements RetryStrategy<R> {
+ private static final Logger LOG =
LoggerFactory.getLogger(CustomRetryStrategy.class);
+
+ private final AbstractHttpClientPlugin<R> httpClientPlugin;
+
+ public CustomRetryStrategy(final AbstractHttpClientPlugin<R>
httpClientPlugin) {
+ this.httpClientPlugin = httpClientPlugin;
+ }
+
+ /**
+ * Custom retry policy.
+ *
+ * @param response he Mono object of the response
+ * @param exchange Current Server Exchange Object
+ * @param duration Timeout
+ * @param retryTimes Number of retries
+ * @return Response Mono object after retry processing
+ */
+ public Mono<R> execute(final Mono<R> response, final ServerWebExchange
exchange, final Duration duration, final int retryTimes) {
+ return null;
+ }
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/DefaultRetryStrategy.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/DefaultRetryStrategy.java
new file mode 100644
index 0000000000..0e1bab5692
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/DefaultRetryStrategy.java
@@ -0,0 +1,137 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+import java.net.URI;
+import java.time.Duration;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.TimeoutException;
+import java.util.stream.Collectors;
+import org.apache.shenyu.common.constant.Constants;
+import org.apache.shenyu.common.enums.RetryEnum;
+import org.apache.shenyu.common.exception.ShenyuException;
+import org.apache.shenyu.loadbalancer.cache.UpstreamCacheManager;
+import org.apache.shenyu.loadbalancer.entity.Upstream;
+import org.apache.shenyu.loadbalancer.factory.LoadBalancerFactory;
+import org.apache.shenyu.plugin.api.utils.RequestUrlUtils;
+import org.apache.shenyu.plugin.httpclient.exception.ShenyuTimeoutException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+import reactor.util.retry.RetryBackoffSpec;
+
+
+/**
+ * Default Retry Policy Class
+ * Keep the original default request retry test without any changes.
+ * @param <R> Request Response Type
+ * @Date 2025/3/23 08:36
+ */
+public class DefaultRetryStrategy<R> implements RetryStrategy<R> {
+ private static final Logger LOG =
LoggerFactory.getLogger(DefaultRetryStrategy.class);
+
+ private final AbstractHttpClientPlugin<R> httpClientPlugin;
+
+ public DefaultRetryStrategy(final AbstractHttpClientPlugin<R>
httpClientPlugin) {
+ this.httpClientPlugin = httpClientPlugin;
+ }
+
+ @Override
+ public Mono<R> execute(final Mono<R> clientResponse, final
ServerWebExchange exchange, final Duration duration, final int retryTimes) {
+ final String retryStrategy = (String)
Optional.ofNullable(exchange.getAttribute(Constants.RETRY_STRATEGY)).orElseGet(()
-> "current");
+ if (RetryEnum.CURRENT.getName().equals(retryStrategy)) {
+ //old version of DividePlugin and SpringCloudPlugin will run on
this
+ RetryBackoffSpec retryBackoffSpec = Retry.backoff(retryTimes,
Duration.ofMillis(20L))
+ .maxBackoff(Duration.ofSeconds(20L))
+ .transientErrors(true)
+ .jitter(0.5d)
+ .filter(t -> t instanceof
java.util.concurrent.TimeoutException || t instanceof
io.netty.channel.ConnectTimeoutException
+ || t instanceof
io.netty.handler.timeout.ReadTimeoutException || t instanceof
IllegalStateException)
+ .onRetryExhaustedThrow((retryBackoffSpecErr, retrySignal)
-> {
+ throw new ShenyuTimeoutException("Request timeout, the
maximum number of retry times has been exceeded");
+ });
+ return clientResponse.retryWhen(retryBackoffSpec)
+ .onErrorMap(ShenyuTimeoutException.class, th -> new
ResponseStatusException(HttpStatus.REQUEST_TIMEOUT, th.getMessage(), th))
+ .onErrorMap(java.util.concurrent.TimeoutException.class,
th -> new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(),
th));
+ }
+ final Set<URI> exclude = new
HashSet<>(Collections.singletonList(Objects.requireNonNull(exchange.getAttribute(Constants.HTTP_URI))));
+ return resend(clientResponse, exchange, duration, exclude, retryTimes)
+ .onErrorMap(ShenyuException.class, th -> new
ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE,
+ "CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER", th))
+ .onErrorMap(java.util.concurrent.TimeoutException.class, th ->
new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT, th.getMessage(), th));
+ }
+
+ private Mono<R> resend(final Mono<R> clientResponse,
+ final ServerWebExchange exchange,
+ final Duration duration,
+ final Set<URI> exclude,
+ final int retryTimes) {
+ Mono<R> result = clientResponse;
+ for (int i = 0; i < retryTimes; i++) {
+ result = resend(result, exchange, duration, exclude);
+ }
+ return result;
+ }
+
+ private Mono<R> resend(final Mono<R> response,
+ final ServerWebExchange exchange,
+ final Duration duration,
+ final Set<URI> exclude) {
+ // does it necessary to add backoff interval time ?
+ return response.onErrorResume(th -> {
+ final String selectorId =
exchange.getAttribute(Constants.DIVIDE_SELECTOR_ID);
+ final String loadBalance =
exchange.getAttribute(Constants.LOAD_BALANCE);
+ //always query the latest available list
+ final List<Upstream> upstreamList =
UpstreamCacheManager.getInstance().findUpstreamListBySelectorId(selectorId)
+ .stream().filter(data -> {
+ final String trimUri = data.getUrl().trim();
+ for (URI needToExclude : exclude) {
+ if ((needToExclude.getHost() + ":" +
needToExclude.getPort()).equals(trimUri)) {
+ return false;
+ }
+ }
+ return true;
+ }).collect(Collectors.toList());
+ if (upstreamList.isEmpty()) {
+ // no need to retry anymore
+ return Mono.error(new
ShenyuException("CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER"));
+ }
+ final String ip =
Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getAddress().getHostAddress();
+ final Upstream upstream =
LoadBalancerFactory.selector(upstreamList, loadBalance, ip);
+ if (Objects.isNull(upstream)) {
+ // no need to retry anymore
+ return Mono.error(new
ShenyuException("CANNOT_FIND_HEALTHY_UPSTREAM_URL_AFTER_FAILOVER"));
+ }
+ final URI newUri = RequestUrlUtils.buildRequestUri(exchange,
upstream.buildDomain());
+ // in order not to affect the next retry call, newUri needs to be
excluded
+ exclude.add(newUri);
+ return httpClientPlugin.doRequest(exchange,
exchange.getRequest().getMethod().name(), newUri,
exchange.getRequest().getBody())
+ .timeout(duration, Mono.error(() -> new
TimeoutException("Response took longer than timeout: " + duration)))
+ .doOnError(e -> LOG.error(e.getMessage(), e));
+ });
+ }
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/ExponentialRetryBackoffStrategy.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/ExponentialRetryBackoffStrategy.java
new file mode 100644
index 0000000000..3199ea30e9
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/ExponentialRetryBackoffStrategy.java
@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+import reactor.util.retry.RetryBackoffSpec;
+
+import java.time.Duration;
+
+/**
+ * Exponential Retry Backoff Strategy.
+ *
+ * @Date 2025/3/23 14:20
+ */
+public class ExponentialRetryBackoffStrategy<R> implements RetryStrategy<R> {
+ private static final Logger LOG =
LoggerFactory.getLogger(ExponentialRetryBackoffStrategy.class);
+
+ private final AbstractHttpClientPlugin<R> httpClientPlugin;
+
+ public ExponentialRetryBackoffStrategy(final AbstractHttpClientPlugin<R>
httpClientPlugin) {
+ this.httpClientPlugin = httpClientPlugin;
+ }
+
+ /**
+ * Execute retry policy.
+ *
+ * @param response The Mono object of the response
+ * @param exchange Current Server Exchange Object
+ * @param duration Timeout
+ * @param retryTimes Number of retries
+ * @return Response Mono object after retry processing
+ */
+ public Mono<R> execute(final Mono<R> response, final ServerWebExchange
exchange, final Duration duration, final int retryTimes) {
+ RetryBackoffSpec retrySpec = initDefaultBackoff(retryTimes);
+ return response.retryWhen(retrySpec)
+ .timeout(duration, Mono.error(() -> new
java.util.concurrent.TimeoutException("Response took longer than timeout: " +
duration)))
+ .doOnError(e -> LOG.error(e.getMessage(), e));
+ }
+
+ private RetryBackoffSpec initDefaultBackoff(final int retryTimes) {
+ return Retry.backoff(retryTimes, Duration.ofMillis(500))
+ .maxBackoff(Duration.ofSeconds(5))
+ // 只对瞬时错误进行重试
+ .transientErrors(true)
+ // 添加 50% 的随机抖动到每次重试的延迟时间
+ .jitter(0.5d)
+ .filter(t -> t instanceof IllegalStateException)
+ // 当达到最大重试次数后抛出一个指定的异常
+ .onRetryExhaustedThrow((retryBackoffSpecErr, retrySignal) -> {
+ throw new IllegalStateException("重试超限");
+ });
+ }
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/FixedRetryStrategy.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/FixedRetryStrategy.java
new file mode 100644
index 0000000000..8ddf6aeb4b
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/FixedRetryStrategy.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.time.Duration;
+
+/**
+ * Fixed Retry Policy Class.
+ *
+ * @Date 2025/3/23 10:04
+ */
+public class FixedRetryStrategy<R> implements RetryStrategy<R> {
+ private static final Logger LOG =
LoggerFactory.getLogger(FixedRetryStrategy.class);
+
+ private final AbstractHttpClientPlugin<R> httpClientPlugin;
+
+ public FixedRetryStrategy(final AbstractHttpClientPlugin<R>
httpClientPlugin) {
+ this.httpClientPlugin = httpClientPlugin;
+ }
+
+ /**
+ * Execute retry policy.
+ *
+ * @param response The Mono object of the response
+ * @param exchange Current Server Exchange Object
+ * @param duration TIMEOUT
+ * @param retryTimes Number of retries
+ * @return Response Mono object after retry processing
+ */
+ public Mono<R> execute(final Mono<R> response, final ServerWebExchange
exchange, final Duration duration, final int retryTimes) {
+ Retry retrySpec = initFixedBackoff(retryTimes);
+ return response.retryWhen(retrySpec)
+ .timeout(duration, Mono.error(() -> new
java.util.concurrent.TimeoutException("Response took longer than timeout: " +
duration)))
+ .doOnError(e -> LOG.error(e.getMessage(), e));
+ }
+
+ private Retry initFixedBackoff(final int retryTimes) {
+ return Retry.fixedDelay(retryTimes, Duration.ofSeconds(2));
+ }
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/RetryStrategy.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/RetryStrategy.java
new file mode 100644
index 0000000000..ad5747d5af
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/main/java/org/apache/shenyu/plugin/httpclient/RetryStrategy.java
@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.time.Duration;
+
+/**
+ * Retry Policy Interface.
+ * @param <R> Request Response Type
+ *@Date 2025/3/23 08:27
+ */
+public interface RetryStrategy<R> {
+ /**
+ * Execute retry policy.
+ *
+ * @param clientResponse Original Request Response
+ * @param exchange Server Exchange Object
+ * @param duration Timeout
+ * @param retryTimes Number of retries
+ * @return Number of retries
+ */
+ Mono<R> execute(Mono<R> clientResponse, ServerWebExchange exchange,
Duration duration, int retryTimes);
+}
diff --git
a/shenyu-plugin/shenyu-plugin-httpclient/src/test/java/org/apache/shenyu/plugin/httpclient/RetryStrategyTest.java
b/shenyu-plugin/shenyu-plugin-httpclient/src/test/java/org/apache/shenyu/plugin/httpclient/RetryStrategyTest.java
new file mode 100644
index 0000000000..9429d2a55b
--- /dev/null
+++
b/shenyu-plugin/shenyu-plugin-httpclient/src/test/java/org/apache/shenyu/plugin/httpclient/RetryStrategyTest.java
@@ -0,0 +1,105 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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.apache.shenyu.plugin.httpclient;
+
+import java.util.concurrent.TimeoutException;
+import org.junit.jupiter.api.Test;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import java.time.Duration;
+
+import static org.mockito.Mockito.mock;
+
+/**
+ * retry strategy test.
+ *
+ * @Date 2025/3/16 22:46
+ */
+public class RetryStrategyTest {
+
+ @Test
+ void testDefaultRetryBackoffExecute() {
+ // Create a simulated AbstractHttpClientPlugin
+ AbstractHttpClientPlugin<String> httpClientPlugin =
mock(AbstractHttpClientPlugin.class);
+ ExponentialRetryBackoffStrategy<String> strategy = new
ExponentialRetryBackoffStrategy<>(httpClientPlugin);
+
+ // Create a simulated ServerWebExchange
+ ServerWebExchange exchange = mock(ServerWebExchange.class);
+ Duration duration = Duration.ofSeconds(5);
+ int retryTimes = 3;
+
+ // Create a mock response Mono that throws an exception
+ Mono<String> response = Mono.error(new RuntimeException("Test error"));
+
+ // Execute retry policy
+ Mono<String> result = strategy.execute(response, exchange, duration,
retryTimes);
+
+ // Use StepVerifier to verify results
+ StepVerifier.create(result)
+ .expectError(RuntimeException.class)
+ .verify();
+ }
+
+ @Test
+ void testDefaultRetryStrategyExecute() {
+ //Create a simulated AbstractHttpClientPlugin
+ AbstractHttpClientPlugin<String> httpClientPlugin =
mock(AbstractHttpClientPlugin.class);
+ DefaultRetryStrategy<String> strategy = new
DefaultRetryStrategy<>(httpClientPlugin);
+
+ // Create a simulated ServerWebExchange
+ ServerWebExchange exchange = mock(ServerWebExchange.class);
+ Duration duration = Duration.ofSeconds(5);
+ int retryTimes = 3;
+
+ // Create a mock response Mono that throws an exception
+ Mono<String> response = Mono.error(new RuntimeException("Test error"));
+
+ // Execute retry policy
+ Mono<String> result = strategy.execute(response, exchange, duration,
retryTimes);
+
+ // Use StepVerifier to verify results
+ StepVerifier.create(result)
+ .expectError(RuntimeException.class)
+ .verify();
+ }
+
+ @Test
+ void testFixedRetryStrategyExecute() {
+ // Create a simulated AbstractHttpClientPlugin
+ AbstractHttpClientPlugin<String> httpClientPlugin =
mock(AbstractHttpClientPlugin.class);
+ FixedRetryStrategy<String> strategy = new
FixedRetryStrategy<>(httpClientPlugin);
+
+ // Create a simulated ServerWebExchange
+ ServerWebExchange exchange = mock(ServerWebExchange.class);
+ Duration duration = Duration.ofSeconds(5);
+ int retryTimes = 3;
+
+ // Create a mock response Mono that throws an exception
+ Mono<String> response = Mono.error(new RuntimeException("Test error"));
+
+ // Execute retry policy
+ Mono<String> result = strategy.execute(response, exchange, duration,
retryTimes);
+
+ // Use StepVerifier to verify results
+ StepVerifier.create(result)
+ .expectError(TimeoutException.class)
+ .verify();
+ }
+}
