content: /*
   * 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
   *
   *      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.okhttp;
  
  import com.alibaba.csp.sentinel.*;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  import com.alibaba.csp.sentinel.util.AssertUtil;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import okhttp3.Interceptor;
  import okhttp3.Request;
  import okhttp3.Response;
  
  import java.io.IOException;
  
  /**
   * @author zhaoyuguang
   */
  public class SentinelOkHttpInterceptor implements Interceptor {
  
      private final SentinelOkHttpConfig config;
  
      public SentinelOkHttpInterceptor() {
          this.config = new SentinelOkHttpConfig();
      }
  
      public SentinelOkHttpInterceptor(SentinelOkHttpConfig config) {
          AssertUtil.notNull(config, "config cannot be null");
          this.config = config;
      }
  
      @Override
      public Response intercept(Chain chain) throws IOException {
          Entry entry = null;
          try {
              Request request = chain.request();
              String name = config.getResourceExtractor().extract(request, chain.connection());
              if (StringUtil.isNotBlank(config.getResourcePrefix())) {
                  name = config.getResourcePrefix() + name;
              }
              entry = SphU.entry(name, ResourceTypeConstants.COMMON_WEB, EntryType.OUT);
              return chain.proceed(request);
          } catch (BlockException e) {
              return config.getFallback().handle(chain.request(), chain.connection(), e);
          } catch (IOException ex) {
              Tracer.traceEntry(ex, entry);
              throw ex;
          } finally {
              if (entry != null) {
                  entry.exit();
              }
          }
      }
  }