content: /*
   * Copyright 1999-2018 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
   *
   *      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 com.alibaba.csp.sentinel.adapter.dubbo3;
  
  import com.alibaba.csp.sentinel.*;
  import com.alibaba.csp.sentinel.adapter.dubbo3.config.DubboAdapterGlobalConfig;
  import com.alibaba.csp.sentinel.context.ContextUtil;
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  
  import org.apache.dubbo.common.extension.Activate;
  import org.apache.dubbo.rpc.Filter;
  import org.apache.dubbo.rpc.Invocation;
  import org.apache.dubbo.rpc.Invoker;
  import org.apache.dubbo.rpc.Result;
  import org.apache.dubbo.rpc.RpcException;
  
  import static org.apache.dubbo.common.constants.CommonConstants.PROVIDER;
  
  /**
   * <p>Apache Dubbo service provider filter that enables integration with Sentinel. Auto activated by default.</p>
   * <p>Note: this only works for Apache Dubbo 2.7.x or above version.</p>
   * <p>
   * If you want to disable the provider filter, you can configure:
   * <pre>
   * &lt;dubbo:provider filter="-sentinel.dubbo.provider.filter"/&gt;
   * </pre>
   *
   * @author Carpenter Lee
   * @author Eric Zhao
   */
  @Activate(group = PROVIDER)
  public class SentinelDubboProviderFilter extends BaseSentinelDubboFilter implements Filter {
  
      public SentinelDubboProviderFilter() {
          RecordLog.info("Sentinel Apache Dubbo3 provider filter initialized");
      }
  
      @Override
      String getMethodName(Invoker invoker, Invocation invocation, String prefix) {
          return DubboUtils.getMethodResourceName(invoker, invocation, prefix);
      }
  
      @Override
      String getInterfaceName(Invoker invoker, String prefix) {
          return DubboUtils.getInterfaceName(invoker, prefix);
      }
  
      @Override
      public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
          // Get origin caller.
          String origin = DubboAdapterGlobalConfig.getOriginParser().parse(invoker, invocation);
          if (null == origin) {
              origin = "";
          }
          Entry interfaceEntry = null;
          Entry methodEntry = null;
          String prefix = DubboAdapterGlobalConfig.getDubboProviderResNamePrefixKey();
          String interfaceResourceName = getInterfaceName(invoker, prefix);
          String methodResourceName = getMethodName(invoker, invocation, prefix);
          try {
              // Only need to create entrance context at provider side, as context will take effect
              // at entrance of invocation chain only (for inbound traffic).
              ContextUtil.enter(methodResourceName, origin);
              interfaceEntry = SphU.entry(interfaceResourceName, ResourceTypeConstants.COMMON_RPC, EntryType.IN);
              methodEntry = SphU.entry(methodResourceName, ResourceTypeConstants.COMMON_RPC, EntryType.IN,
                  invocation.getArguments());
              Result result = invoker.invoke(invocation);
              if (result.hasException()) {
                  Tracer.traceEntry(result.getException(), interfaceEntry);
                  Tracer.traceEntry(result.getException(), methodEntry);
              }
              return result;
          } catch (BlockException e) {
              return DubboAdapterGlobalConfig.getProviderFallback().handle(invoker, invocation, e);
          } catch (RpcException e) {
              Tracer.traceEntry(e, interfaceEntry);
              Tracer.traceEntry(e, methodEntry);
              throw e;
          } finally {
              if (methodEntry != null) {
                  methodEntry.exit(1, invocation.getArguments());
              }
              if (interfaceEntry != null) {
                  interfaceEntry.exit();
              }
              ContextUtil.exit();
          }
      }
  
  }
  
  