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.grpc;
  
  import com.alibaba.csp.sentinel.EntryType;
  import com.alibaba.csp.sentinel.adapter.grpc.gen.FooRequest;
  import com.alibaba.csp.sentinel.adapter.grpc.gen.FooResponse;
  import com.alibaba.csp.sentinel.node.ClusterNode;
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
  import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
  import com.alibaba.csp.sentinel.slots.clusterbuilder.ClusterBuilderSlot;
  import io.grpc.StatusRuntimeException;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  import java.util.Collections;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Test cases for {@link SentinelGrpcClientInterceptor}.
   *
   * @author Eric Zhao
   */
  public class SentinelGrpcClientInterceptorTest {
      private final String fullMethodName = "com.alibaba.sentinel.examples.FooService/sayHello";
      private final GrpcTestServer server = new GrpcTestServer();
      private FooServiceClient client;
  
      private void configureFlowRule(int count) {
          FlowRule rule = new FlowRule()
                  .setCount(count)
                  .setGrade(RuleConstant.FLOW_GRADE_QPS)
                  .setResource(fullMethodName)
                  .setLimitApp("default")
                  .as(FlowRule.class);
          FlowRuleManager.loadRules(Collections.singletonList(rule));
      }
  
      @Test
      public void testGrpcClientInterceptor() throws Exception {
          final int port = 19328;
          server.start(port, false);
          client = new FooServiceClient("localhost", port, new SentinelGrpcClientInterceptor());
  
          configureFlowRule(Integer.MAX_VALUE);
          assertTrue(sendRequest(FooRequest.newBuilder().setName("Sentinel").setId(666).build()));
          ClusterNode clusterNode = ClusterBuilderSlot.getClusterNode(fullMethodName, EntryType.OUT);
          assertNotNull(clusterNode);
          assertEquals(1, clusterNode.totalPass());
  
          // Not allowed to pass.
          configureFlowRule(0);
          // The second request will be blocked.
          assertFalse(sendRequest(FooRequest.newBuilder().setName("Sentinel").setId(666).build()));
          assertEquals(1, clusterNode.blockRequest());
  
          configureFlowRule(Integer.MAX_VALUE);
          assertFalse(sendRequest(FooRequest.newBuilder().setName("Sentinel").setId(-1).build()));
          assertEquals(1, clusterNode.totalException());
  
          configureFlowRule(Integer.MAX_VALUE);
          assertTrue(sendRequest(FooRequest.newBuilder().setName("Sentinel").setId(-2).build()));
          assertTrue(clusterNode.avgRt() >= 1000);
  
          server.stop();
      }
  
      private boolean sendRequest(FooRequest request) {
          try {
              FooResponse response = client.sayHello(request);
              System.out.println("Response: " + response);
              return true;
          } catch (StatusRuntimeException ex) {
              System.out.println("Blocked, cause: " + ex.getMessage());
              return false;
          }
      }
  
      @Before
      public void cleanUpBefore() {
          FlowRuleManager.loadRules(null);
          ClusterBuilderSlot.getClusterNodeMap().clear();
      }
  
      @After
      public void cleanUpAfter() {
          FlowRuleManager.loadRules(null);
          ClusterBuilderSlot.getClusterNodeMap().clear();
      }
  }
  