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.gateway.zuul.filters;
  
  import com.alibaba.csp.sentinel.adapter.gateway.zuul.constants.ZuulConstant;
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  
  import com.netflix.zuul.ZuulFilter;
  import com.netflix.zuul.context.RequestContext;
  import com.netflix.zuul.exception.ZuulException;
  
  /**
   * This filter track routing exception and exit entry;
   *
   * @author tiger
   * @author Eric Zhao
   */
  public class SentinelZuulErrorFilter extends ZuulFilter {
  
      private final int order;
  
      public SentinelZuulErrorFilter() {
          this(-1);
      }
  
      public SentinelZuulErrorFilter(int order) {
          this.order = order;
      }
  
      @Override
      public String filterType() {
          return ZuulConstant.ERROR_TYPE;
      }
  
      @Override
      public boolean shouldFilter() {
          RequestContext ctx = RequestContext.getCurrentContext();
          return ctx.getThrowable() != null;
      }
  
      @Override
      public int filterOrder() {
          return order;
      }
  
      @Override
      public Object run() throws ZuulException {
          RequestContext ctx = RequestContext.getCurrentContext();
          Throwable throwable = ctx.getThrowable();
          if (throwable != null) {
              if (!BlockException.isBlockException(throwable)) {
                  // Trace exception for each entry and exit entries in order.
                  // The entries can be retrieved from the request context.
                  SentinelEntryUtils.tryTraceExceptionThenExitFromCurrentContext(throwable);
                  RecordLog.info("[SentinelZuulErrorFilter] Trace error cause", throwable.getCause());
              }
          }
          return null;
      }
  }
  