content: /*
   *  Copyright 1999-2021 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.nacos.core.remote.grpc;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.grpc.auto.Payload;
  import com.alibaba.nacos.api.grpc.auto.RequestGrpc;
  import com.alibaba.nacos.api.naming.remote.request.InstanceRequest;
  import com.alibaba.nacos.api.remote.request.HealthCheckRequest;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.api.remote.request.ServerCheckRequest;
  import com.alibaba.nacos.api.remote.response.ErrorResponse;
  import com.alibaba.nacos.api.remote.response.HealthCheckResponse;
  import com.alibaba.nacos.api.remote.response.Response;
  import com.alibaba.nacos.api.remote.response.ServerCheckResponse;
  import com.alibaba.nacos.common.constant.HttpHeaderConsts;
  import com.alibaba.nacos.common.remote.PayloadRegistry;
  import com.alibaba.nacos.common.remote.client.grpc.GrpcUtils;
  import com.alibaba.nacos.core.context.RequestContextHolder;
  import com.alibaba.nacos.core.remote.Connection;
  import com.alibaba.nacos.core.remote.ConnectionManager;
  import com.alibaba.nacos.core.remote.ConnectionMeta;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.core.remote.RequestHandlerRegistry;
  import com.alibaba.nacos.sys.utils.ApplicationUtils;
  import com.asarkar.grpc.test.GrpcCleanupExtension;
  import com.asarkar.grpc.test.Resources;
  import io.grpc.Context;
  import io.grpc.Contexts;
  import io.grpc.ManagedChannel;
  import io.grpc.Metadata;
  import io.grpc.ServerCall;
  import io.grpc.ServerCallHandler;
  import io.grpc.ServerInterceptor;
  import io.grpc.inprocess.InProcessChannelBuilder;
  import io.grpc.inprocess.InProcessServerBuilder;
  import io.grpc.stub.StreamObserver;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.InjectMocks;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  import java.io.IOException;
  import java.time.Duration;
  import java.util.HashMap;
  import java.util.UUID;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.fail;
  
  /**
   * {@link GrpcRequestAcceptor} unit test.
   *
   * @author chenglu
   * @date 2021-07-01 10:49
   */
  @ExtendWith({MockitoExtension.class, GrpcCleanupExtension.class})
  public class GrpcRequestAcceptorTest {
      
      @Mock
      private ConnectionManager connectionManager;
      
      @Mock
      private RequestHandlerRegistry requestHandlerRegistry;
      
      @InjectMocks
      private GrpcRequestAcceptor acceptor;
      
      private RequestGrpc.RequestStub streamStub;
      
      private String connectId = UUID.randomUUID().toString();
      
      private String requestId = UUID.randomUUID().toString();
      
      private MockRequestHandler mockHandler;
      
      @BeforeEach
      void setUp(Resources resources) throws IOException {
          String serverName = InProcessServerBuilder.generateName();
          String remoteIp = "127.0.0.1";
          resources.register(
                  InProcessServerBuilder.forName(serverName).directExecutor().addService(acceptor).intercept(new ServerInterceptor() {
                      @Override
                      public <R, S> ServerCall.Listener<R> interceptCall(ServerCall<R, S> serverCall, Metadata metadata,
                              ServerCallHandler<R, S> serverCallHandler) {
                          Context ctx = Context.current().withValue(GrpcServerConstants.CONTEXT_KEY_CONN_ID, UUID.randomUUID().toString())
                                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_LOCAL_PORT, 1234)
                                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_REMOTE_PORT, 8948)
                                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_REMOTE_IP, remoteIp);
                          return Contexts.interceptCall(ctx, serverCall, metadata, serverCallHandler);
                      }
                  }).build().start(), Duration.ofSeconds(20L));
          ManagedChannel channel = InProcessChannelBuilder.forName(serverName).directExecutor().build();
          resources.register(channel, Duration.ofSeconds(20L));
          streamStub = RequestGrpc.newStub(channel);
          mockHandler = new MockRequestHandler();
          PayloadRegistry.init();
      }
      
      @AfterEach
      void tearDown() {
          RequestContextHolder.removeContext();
      }
      
      @Test
      void testApplicationUnStarted() {
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          ServerCheckRequest serverCheckRequest = new ServerCheckRequest();
          serverCheckRequest.setRequestId(requestId);
          Payload request = GrpcUtils.convert(serverCheckRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ErrorResponse);
                  ErrorResponse errorResponse = (ErrorResponse) res;
                  assertEquals(NacosException.INVALID_SERVER_STATUS, errorResponse.getErrorCode());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(request, streamObserver);
      }
      
      @Test
      void testServerCheckRequest() {
          ApplicationUtils.setStarted(true);
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          ServerCheckRequest serverCheckRequest = new ServerCheckRequest();
          serverCheckRequest.setRequestId(requestId);
          Payload request = GrpcUtils.convert(serverCheckRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ServerCheckResponse);
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(request, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testNoRequestHandler() {
          ApplicationUtils.setStarted(true);
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          InstanceRequest instanceRequest = new InstanceRequest();
          instanceRequest.setRequestId(requestId);
          Payload request = GrpcUtils.convert(instanceRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ErrorResponse);
                  
                  ErrorResponse errorResponse = (ErrorResponse) res;
                  assertEquals(NacosException.NO_HANDLER, errorResponse.getErrorCode());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(request, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testConnectionNotRegister() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(false);
          
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          InstanceRequest instanceRequest = new InstanceRequest();
          instanceRequest.setRequestId(requestId);
          Payload request = GrpcUtils.convert(instanceRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ErrorResponse);
                  
                  ErrorResponse errorResponse = (ErrorResponse) res;
                  assertEquals(NacosException.UN_REGISTER, errorResponse.getErrorCode());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(request, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testRequestContentError() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(true);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ErrorResponse);
                  
                  ErrorResponse errorResponse = (ErrorResponse) res;
                  assertEquals(NacosException.BAD_GATEWAY, errorResponse.getErrorCode());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(null, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testHandleRequestSuccess() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(true);
          String ip = "1.1.1.1";
          ConnectionMeta connectionMeta = new ConnectionMeta(connectId, ip, ip, 8888, 9848, "GRPC", "", "", new HashMap<>());
          Connection connection = new GrpcConnection(connectionMeta, null, null);
          Mockito.when(connectionManager.getConnection(Mockito.any())).thenReturn(connection);
          
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          HealthCheckRequest mockRequest = new HealthCheckRequest();
          Payload payload = GrpcUtils.convert(mockRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof HealthCheckResponse);
                  assertEquals("unknown", RequestContextHolder.getContext().getBasicContext().getApp());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(payload, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testHandleRequestError() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(true);
          
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          InstanceRequest instanceRequest = new InstanceRequest();
          Payload payload = GrpcUtils.convert(instanceRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof ErrorResponse);
                  
                  ErrorResponse errorResponse = (ErrorResponse) res;
                  assertEquals(NacosException.SERVER_ERROR, errorResponse.getErrorCode());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(payload, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testHandleRequestSuccessWithAppName() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(true);
          String ip = "1.1.1.1";
          ConnectionMeta connectionMeta = new ConnectionMeta(connectId, ip, ip, 8888, 9848, "GRPC", "", "appNameInConnection", new HashMap<>());
          Connection connection = new GrpcConnection(connectionMeta, null, null);
          Mockito.when(connectionManager.getConnection(Mockito.any())).thenReturn(connection);
          
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          HealthCheckRequest mockRequest = new HealthCheckRequest();
          Payload payload = GrpcUtils.convert(mockRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof HealthCheckResponse);
                  assertEquals("appNameInConnection", RequestContextHolder.getContext().getBasicContext().getApp());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(payload, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      @Test
      void testHandleRequestSuccessWithAppNameInHeader() {
          ApplicationUtils.setStarted(true);
          Mockito.when(requestHandlerRegistry.getByRequestType(Mockito.anyString())).thenReturn(mockHandler);
          Mockito.when(connectionManager.checkValid(Mockito.any())).thenReturn(true);
          String ip = "1.1.1.1";
          ConnectionMeta connectionMeta = new ConnectionMeta(connectId, ip, ip, 8888, 9848, "GRPC", "", "-", new HashMap<>());
          Connection connection = new GrpcConnection(connectionMeta, null, null);
          Mockito.when(connectionManager.getConnection(Mockito.any())).thenReturn(connection);
          
          RequestMeta metadata = new RequestMeta();
          metadata.setClientIp("127.0.0.1");
          metadata.setConnectionId(connectId);
          HealthCheckRequest mockRequest = new HealthCheckRequest();
          mockRequest.putHeader(HttpHeaderConsts.APP_FILED, "appNameInHeader");
          Payload payload = GrpcUtils.convert(mockRequest, metadata);
          
          StreamObserver<Payload> streamObserver = new StreamObserver<Payload>() {
              @Override
              public void onNext(Payload payload) {
                  System.out.println("Receive data from server: " + payload);
                  Object res = GrpcUtils.parse(payload);
                  assertTrue(res instanceof HealthCheckResponse);
                  assertEquals("appNameInHeader", RequestContextHolder.getContext().getBasicContext().getApp());
              }
              
              @Override
              public void onError(Throwable throwable) {
                  fail(throwable.getMessage());
              }
              
              @Override
              public void onCompleted() {
                  System.out.println("complete");
              }
          };
          
          streamStub.request(payload, streamObserver);
          ApplicationUtils.setStarted(false);
      }
      
      /**
       * add this Handler just for test.
       */
      class MockRequestHandler extends RequestHandler<HealthCheckRequest, HealthCheckResponse> {
          
          @Override
          public Response handleRequest(HealthCheckRequest request, RequestMeta meta) throws NacosException {
              return handle(request, meta);
          }
          
          @Override
          public HealthCheckResponse handle(HealthCheckRequest request, RequestMeta meta) throws NacosException {
              System.out.println("MockHandler get request: " + request + " meta: " + meta);
              return new HealthCheckResponse();
          }
      }
  }
  