Copilot commented on code in PR #6060:
URL: https://github.com/apache/shenyu/pull/6060#discussion_r2280395008


##########
shenyu-common/src/main/java/org/apache/shenyu/common/dto/convert/rule/AiProxyHandle.java:
##########
@@ -218,24 +242,212 @@ public boolean equals(final Object o) {
                 && Objects.equals(model, that.model)
                 && Objects.equals(temperature, that.temperature)
                 && Objects.equals(maxTokens, that.maxTokens)
-                && Objects.equals(stream, that.stream);
+                && Objects.equals(stream, that.stream)
+                && Objects.equals(fallbackConfig, that.fallbackConfig);
     }
-    
+
     @Override
     public int hashCode() {
-        return Objects.hash(provider, baseUrl, apiKey, model, temperature, 
maxTokens, stream);
+        return Objects.hash(provider, baseUrl, apiKey, model, temperature, 
maxTokens, stream, fallbackConfig);
     }
-    
+
     @Override
     public String toString() {
         return "AiProxyHandle{"
                 + "provider='" + provider + '\''
                 + ", baseUrl='" + baseUrl + '\''
-                + ", apiKey='" + apiKey + '\''
+                + ", apiKey='" + maskApiKey(apiKey) + '\''
                 + ", model='" + model + '\''
                 + ", temperature=" + temperature
                 + ", maxTokens=" + maxTokens
                 + ", stream=" + stream
+                + ", fallbackConfig=" + fallbackConfig
                 + '}';
     }
-}
+
+    public static String maskApiKey(final String apiKey) {
+        if (Objects.isNull(apiKey) || apiKey.length() <= 7) {
+            return apiKey;
+        }
+        if (Objects.isNull(apiKey) || apiKey.isEmpty()) {

Review Comment:
   This null check is redundant as it was already performed on line 269. The 
condition `apiKey.length() <= 7` on line 269 would have thrown a 
NullPointerException if apiKey was null, so this check should be removed or the 
logic should be restructured.
   ```suggestion
           if (apiKey.isEmpty()) {
   ```



##########
shenyu-plugin/shenyu-plugin-ai/shenyu-plugin-ai-proxy-enhanced/src/main/java/org/apache/shenyu/plugin/ai/proxy/enhanced/handler/AiProxyPluginHandler.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.ai.proxy.enhanced.handler;
+
+import org.apache.shenyu.common.constant.Constants;
+import org.apache.shenyu.common.dto.PluginData;
+import org.apache.shenyu.common.dto.SelectorData;
+import org.apache.shenyu.common.dto.convert.rule.AiProxyHandle;
+import org.apache.shenyu.common.enums.PluginEnum;
+import org.apache.shenyu.common.utils.GsonUtils;
+import org.apache.shenyu.plugin.ai.proxy.enhanced.cache.ChatClientCache;
+import org.apache.shenyu.plugin.base.cache.CommonHandleCache;
+import org.apache.shenyu.plugin.base.handler.PluginDataHandler;
+import org.apache.shenyu.plugin.base.utils.CacheKeyUtils;
+
+import java.util.Objects;
+
+/**
+ * this is ai proxy plugin handler.
+ */
+public class AiProxyPluginHandler implements PluginDataHandler {
+
+    private final CommonHandleCache<String, AiProxyHandle> 
selectorCachedHandle = new CommonHandleCache<>();
+
+    private final ChatClientCache chatClientCache;
+
+    public AiProxyPluginHandler(final ChatClientCache chatClientCache) {
+        this.chatClientCache = chatClientCache;
+    }
+
+    @Override
+    public void handlerPlugin(final PluginData pluginData) {
+        // Note: The logic for handling global plugin configuration with 
Singleton has been removed
+        // as it's part of the legacy pattern we are moving away from.
+        // Global configs should be managed as Spring beans if needed.

Review Comment:
   [nitpick] This comment explains removed functionality rather than 
documenting current behavior. Consider updating to describe what the method 
currently does: 'Currently no global plugin configuration handling is 
performed.'
   ```suggestion
           // No global plugin configuration handling is performed.
   ```



##########
shenyu-plugin/shenyu-plugin-ai/shenyu-plugin-ai-proxy-enhanced/src/main/java/org/apache/shenyu/plugin/ai/proxy/enhanced/service/AiProxyExecutorService.java:
##########
@@ -0,0 +1,118 @@
+/*
+ * 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.ai.proxy.enhanced.service;
+
+import org.apache.shenyu.plugin.ai.common.strategy.SimpleModelFallbackStrategy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.ai.chat.client.ChatClient;
+import org.springframework.ai.chat.model.ChatResponse;
+import org.springframework.ai.retry.NonTransientAiException;
+import org.springframework.stereotype.Service;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Schedulers;
+import reactor.util.retry.Retry;
+
+import java.time.Duration;
+import java.util.Optional;
+
+/**
+ * AI proxy executor service.
+ */
+@Service
+public class AiProxyExecutorService {
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(AiProxyExecutorService.class);
+
+    /**
+     * Execute the AI call with retry and fallback.
+     *
+     * @param mainClient      the main chat client
+     * @param fallbackClientOpt the optional fallback chat client
+     * @param requestBody     the request body
+     * @return a Mono containing the ChatResponse
+     */
+    public Mono<ChatResponse> execute(final ChatClient mainClient, final 
Optional<ChatClient> fallbackClientOpt, final String requestBody) {
+        final Mono<ChatResponse> mainCall = doChatCall(mainClient, 
requestBody);
+
+        return mainCall
+                .retryWhen(Retry.backoff(3, Duration.ofSeconds(1))
+                        .filter(throwable -> !(throwable instanceof 
NonTransientAiException))
+                        .onRetryExhaustedThrow((retryBackoffSpec, retrySignal) 
-> {
+                            LOG.warn("Retries exhausted for AI call after {} 
attempts.",
+                                    retrySignal.totalRetries(), 
retrySignal.failure());
+                            return new NonTransientAiException("Retries 
exhausted. Triggering fallback.",
+                                    retrySignal.failure());
+                        }))
+                .onErrorResume(NonTransientAiException.class,
+                        throwable -> handleFallback(throwable, 
fallbackClientOpt, requestBody));
+    }
+
+    protected Mono<ChatResponse> doChatCall(final ChatClient client, final 
String requestBody) {
+        return Mono.fromCallable(() -> 
client.prompt().user(requestBody).call().chatResponse())
+                .subscribeOn(Schedulers.boundedElastic());
+    }
+
+    private Mono<ChatResponse> handleFallback(final Throwable throwable, final 
Optional<ChatClient> fallbackClientOpt, final String requestBody) {
+        LOG.warn("AI main call failed or retries exhausted, attempting to 
fallback...", throwable);
+
+        if (fallbackClientOpt.isEmpty()) {
+            return Mono.error(throwable);
+        }
+
+        return 
SimpleModelFallbackStrategy.INSTANCE.fallback(fallbackClientOpt.get(), 
requestBody, throwable);
+    }
+
+    /**
+     * Execute the AI call with retry and fallback.
+     *
+     * @param mainClient      the main chat client
+     * @param fallbackClientOpt the optional fallback chat client
+     * @param requestBody     the request body
+     * @return a Flux containing the ChatResponse
+     */
+    public Flux<ChatResponse> executeStream(final ChatClient mainClient, final 
Optional<ChatClient> fallbackClientOpt, final String requestBody) {
+        final Flux<ChatResponse> mainStream = doChatStream(mainClient, 
requestBody);
+
+        return mainStream
+                .retryWhen(Retry.max(1)
+                        .onRetryExhaustedThrow((retryBackoffSpec, retrySignal) 
-> {
+                            LOG.warn("Retrying stream once failed. Attempts: 
{}. Triggering fallback.",
+                                    retrySignal.totalRetries(), 
retrySignal.failure());
+                            return new NonTransientAiException("Stream failed 
after 1 retry. Triggering fallback.");

Review Comment:
   The NonTransientAiException constructor call is missing the cause parameter. 
It should include the original failure: `new NonTransientAiException("Stream 
failed after 1 retry. Triggering fallback.", retrySignal.failure())`
   ```suggestion
                               return new NonTransientAiException("Stream 
failed after 1 retry. Triggering fallback.", retrySignal.failure());
   ```



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