Support customized origin parser in legacy Dubbo 2.6.x adapter (#1555)

sentinel-adapter/sentinel-dubbo-adapter/README.md

@@ -65,4 +65,10 @@ flow control, degrade or system load protection. You can implement your own `Dub
 and then register to `DubboFallbackRegistry`. If no fallback is configured, Sentinel will wrap the `BlockException`
 then directly throw it out.
 
-Besides, we can also leverage [Dubbo mock mechanism](http://dubbo.apache.org/en-us/docs/user/demos/local-mock.html) to provide fallback implementation of degraded Dubbo services.
+Besides, we can also leverage [Dubbo mock mechanism](http://dubbo.apache.org/en-us/docs/user/demos/local-mock.html) to provide fallback implementation of degraded Dubbo services.
+
+## Global dubbo provider origin parse
+
+Sentinel Dubbo Adapter supports global origin parse for provider.
+You can implement your own `DubboOriginParser` interface
+and then register to `DubboOriginParserRegistry`. If no originParse is configured, Sentinel will user dubbo url property application.

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboProviderFilter.java

@@ -22,6 +22,7 @@ import com.alibaba.csp.sentinel.SphU;
 import com.alibaba.csp.sentinel.Tracer;
 import com.alibaba.csp.sentinel.adapter.dubbo.config.DubboConfig;
 import com.alibaba.csp.sentinel.adapter.dubbo.fallback.DubboFallbackRegistry;
+import com.alibaba.csp.sentinel.adapter.dubbo.origin.DubboOriginParserRegistry;
 import com.alibaba.csp.sentinel.context.ContextUtil;
 import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.slots.block.BlockException;
@@ -55,14 +56,17 @@ public class SentinelDubboProviderFilter extends AbstractDubboFilter implements
     @Override
     public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
         // Get origin caller.
-        String application = DubboUtils.getApplication(invocation, "");
+        String origin = DubboOriginParserRegistry.getDubboOriginParser().parse(invoker, invocation);
+        if (null == origin) {
+            origin = "";
+        }
 
         Entry interfaceEntry = null;
         Entry methodEntry = null;
         try {
             String resourceName = getResourceName(invoker, invocation, DubboConfig.getDubboProviderPrefix());
             String interfaceName = invoker.getInterface().getName();
-            ContextUtil.enter(resourceName, application);
+            ContextUtil.enter(resourceName, origin);
             interfaceEntry = SphU.entry(interfaceName, ResourceTypeConstants.COMMON_RPC, EntryType.IN);
             methodEntry = SphU.entry(resourceName, ResourceTypeConstants.COMMON_RPC,
                 EntryType.IN, invocation.getArguments());

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/origin/DefaultDubboOriginParser.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.csp.sentinel.adapter.dubbo.origin;
+
+import com.alibaba.csp.sentinel.adapter.dubbo.DubboUtils;
+import com.alibaba.dubbo.rpc.Invocation;
+import com.alibaba.dubbo.rpc.Invoker;
+
+/**
+ * Default Dubbo origin parse.
+ *
+ * @author tiecheng
+ */
+public class DefaultDubboOriginParser implements DubboOriginParser {
+
+    @Override
+    public String parse(Invoker<?> invoker, Invocation invocation) {
+        return DubboUtils.getApplication(invocation, "");
+    }
+
+}

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/origin/DubboOriginParser.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.csp.sentinel.adapter.dubbo.origin;
+
+import com.alibaba.csp.sentinel.context.Context;
+import com.alibaba.dubbo.rpc.Invocation;
+import com.alibaba.dubbo.rpc.Invoker;
+
+/**
+ * Customized origin parse in Dubbo provider filter. {@link Context#getOrigin()}
+ *
+ * @author tiecheng
+ */
+public interface DubboOriginParser {
+
+    /**
+     * Handle the origin parse.
+     *
+     * @param invoker    Dubbo invoker
+     * @param invocation Dubbo invocation
+     * @return parse result
+     */
+    String parse(Invoker<?> invoker, Invocation invocation);
+
+}

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/origin/DubboOriginParserRegistry.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.csp.sentinel.adapter.dubbo.origin;
+
+/**
+ * Global origin parser registry for Dubbo.
+ *
+ * @author tiecheng
+ */
+public final class DubboOriginParserRegistry {
+
+    private static volatile DubboOriginParser dubboOriginParser = new DefaultDubboOriginParser();
+
+    public static DubboOriginParser getDubboOriginParser() {
+        return dubboOriginParser;
+    }
+
+    public static void setDubboOriginParser(DubboOriginParser dubboOriginParser) {
+        DubboOriginParserRegistry.dubboOriginParser = dubboOriginParser;
+    }
+
+    private DubboOriginParserRegistry() {}
+
+}

sentinel-adapter/sentinel-dubbo-adapter/src/test/java/com/alibaba/csp/sentinel/adapter/dubbo/origin/DubboOriginRegistryTest.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 1999-2020 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.csp.sentinel.adapter.dubbo.origin;
+
+import com.alibaba.csp.sentinel.adapter.dubbo.DubboUtils;
+import com.alibaba.dubbo.rpc.Invocation;
+import com.alibaba.dubbo.rpc.Invoker;
+import com.alibaba.dubbo.rpc.RpcInvocation;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author tiecheng
+ */
+public class DubboOriginRegistryTest {
+
+    @After
+    public void cleanUp() {
+        DubboOriginParserRegistry.setDubboOriginParser(new DefaultDubboOriginParser());
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testDefaultOriginParserFail() {
+        DubboOriginParserRegistry.getDubboOriginParser().parse(null, null);
+    }
+
+    @Test
+    public void testDefaultOriginParserSuccess() {
+        RpcInvocation invocation = new RpcInvocation();
+        String dubboName = "sentinel";
+        invocation.setAttachment(DubboUtils.DUBBO_APPLICATION_KEY, dubboName);
+        String origin = DubboOriginParserRegistry.getDubboOriginParser().parse(null, invocation);
+        Assert.assertEquals(dubboName, origin);
+    }
+
+    @Test
+    public void testCustomOriginParser() {
+        DubboOriginParserRegistry.setDubboOriginParser(new DubboOriginParser() {
+            @Override
+            public String parse(Invoker<?> invoker, Invocation invocation) {
+                return invocation.getAttachment(DubboUtils.DUBBO_APPLICATION_KEY, "default") + "_" + invocation
+                    .getMethodName();
+            }
+        });
+
+        RpcInvocation invocation = new RpcInvocation();
+        String origin = DubboOriginParserRegistry.getDubboOriginParser().parse(null, invocation);
+        Assert.assertEquals("default_null", origin);
+
+        String dubboName = "sentinel";
+        invocation.setAttachment(DubboUtils.DUBBO_APPLICATION_KEY, dubboName);
+        origin = DubboOriginParserRegistry.getDubboOriginParser().parse(null, invocation);
+        Assert.assertEquals(dubboName + "_null", origin);
+
+        invocation.setMethodName("hello");
+        origin = DubboOriginParserRegistry.getDubboOriginParser().parse(null, invocation);
+        Assert.assertEquals(dubboName + "_hello", origin);
+    }
+
+}