[Feature] Support Tracing for GlobalFilter and GatewayFilter in Gateway

CHANGES.md

@@ -16,6 +16,7 @@ Release Notes.
 * Bump up gRPC to 1.68.1
 * Bump up netty to 4.1.115.Final
 * Fix the `CreateAopProxyInterceptor` in the Spring core-patch to prevent it from changing the implementation of the Spring AOP proxy  
+* Support Tracing for GlobalFilter and GatewayFilter in Spring Gateway
 
 All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/222?closed=1)
 

apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.0.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v20x/GatewayFilterInterceptor.java

@@ -0,0 +1,94 @@
+/*
+ *  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.skywalking.apm.plugin.spring.cloud.gateway.v20x;
+
+import org.apache.skywalking.apm.agent.core.context.ContextManager;
+import org.apache.skywalking.apm.agent.core.context.ContextSnapshot;
+import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.ServerWebExchangeDecorator;
+import org.springframework.web.server.adapter.DefaultServerWebExchange;
+
+import java.lang.reflect.Method;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.apache.skywalking.apm.network.trace.component.ComponentsDefine.SPRING_CLOUD_GATEWAY;
+
+public class GatewayFilterInterceptor implements InstanceMethodsAroundInterceptor {
+
+    private static final ThreadLocal<AtomicInteger> STACK_DEEP = ThreadLocal.withInitial(() -> new AtomicInteger(0));
+
+    @Override
+    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
+                             MethodInterceptResult result) throws Throwable {
+        if (isEntry()) {
+            ServerWebExchange exchange = (ServerWebExchange) allArguments[0];
+
+            EnhancedInstance enhancedInstance = getInstance(exchange);
+
+            AbstractSpan span = ContextManager.createLocalSpan("SpringCloudGateway/GatewayFilter");
+            if (enhancedInstance != null && enhancedInstance.getSkyWalkingDynamicField() != null) {
+                ContextManager.continued((ContextSnapshot) enhancedInstance.getSkyWalkingDynamicField());
+            }
+            span.setComponent(SPRING_CLOUD_GATEWAY);
+        }
+    }
+
+    public static EnhancedInstance getInstance(Object o) {
+        EnhancedInstance instance = null;
+        if (o instanceof DefaultServerWebExchange) {
+            instance = (EnhancedInstance) o;
+        } else if (o instanceof ServerWebExchangeDecorator) {
+            ServerWebExchange delegate = ((ServerWebExchangeDecorator) o).getDelegate();
+            return getInstance(delegate);
+        }
+        return instance;
+    }
+
+    @Override
+    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
+                              Object ret) throws Throwable {
+        if (isExit()) {
+            if (ContextManager.isActive()) {
+                ContextManager.stopSpan();
+            }
+        }
+        return ret;
+    }
+
+    @Override
+    public void handleMethodException(EnhancedInstance objInst, Method method, Object[] allArguments,
+                                      Class<?>[] argumentsTypes, Throwable t) {
+        ContextManager.activeSpan().log(t);
+    }
+
+    private boolean isEntry() {
+        return STACK_DEEP.get().getAndIncrement() == 0;
+    }
+
+    private boolean isExit() {
+        boolean isExit = STACK_DEEP.get().decrementAndGet() == 0;
+        if (isExit) {
+            STACK_DEEP.remove();
+        }
+        return isExit;
+    }
+}

apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.0.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v20x/define/Constants.java

@@ -29,4 +29,8 @@ public interface Constants {
     // HttpClientRequest
     String INTERCEPT_CLASS_HTTP_CLIENT_REQUEST = "reactor.ipc.netty.http.client.HttpClientRequest";
     String HTTPCLIENT_REQUEST_HEADERS_INTERCEPTOR = "org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.HttpclientRequestHeadersInterceptor";
+
+    // GatewayFilter
+    String INTERCEPT_CLASS_GATEWAY_FILTER = "org.springframework.cloud.gateway.filter.GatewayFilter";
+    String GATEWAY_FILTER_INTERCEPTOR = "org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.GatewayFilterInterceptor";
 }

apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.0.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v20x/define/GatewayFilterInstrumentation.java

@@ -0,0 +1,64 @@
+/*
+ *  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.skywalking.apm.plugin.spring.cloud.gateway.v20x.define;
+
+import net.bytebuddy.description.method.MethodDescription;
+import net.bytebuddy.matcher.ElementMatcher;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.ConstructorInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.interceptor.InstanceMethodsInterceptPoint;
+import org.apache.skywalking.apm.agent.core.plugin.match.ClassMatch;
+import org.apache.skywalking.apm.agent.core.plugin.match.HierarchyMatch;
+
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static org.apache.skywalking.apm.agent.core.plugin.bytebuddy.ArgumentTypeNameMatch.takesArgumentWithType;
+
+public class GatewayFilterInstrumentation extends AbstractGateway200EnhancePluginDefine {
+
+    @Override
+    protected ClassMatch enhanceClass() {
+        return HierarchyMatch.byHierarchyMatch(Constants.INTERCEPT_CLASS_GATEWAY_FILTER);
+    }
+
+    @Override
+    public ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
+        return new ConstructorInterceptPoint[0];
+    }
+
+    @Override
+    public InstanceMethodsInterceptPoint[] getInstanceMethodsInterceptPoints() {
+        return new InstanceMethodsInterceptPoint[] {
+            new InstanceMethodsInterceptPoint() {
+                @Override
+                public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named("filter").and(
+                        takesArgumentWithType(0, "org.springframework.web.server.ServerWebExchange"));
+                }
+
+                @Override
+                public String getMethodsInterceptor() {
+                    return Constants.GATEWAY_FILTER_INTERCEPTOR;
+                }
+
+                @Override
+                public boolean isOverrideArgs() {
+                    return true;
+                }
+            }
+        };
+    }
+}

apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.0.x-plugin/src/main/resources/skywalking-plugin.def

@@ -18,4 +18,5 @@ spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway
 spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.HttpClientInstrumentation
 spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.HttpClientRequestInstrumentation
 spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.ServerWebExchangeInstrumentation
-spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.DispatcherHandlerInstrumentation
+spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.DispatcherHandlerInstrumentation
+spring-cloud-gateway-2.0.x=org.apache.skywalking.apm.plugin.spring.cloud.gateway.v20x.define.GatewayFilterInstrumentation