| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.servicecomb.qps; |
| |
| import org.apache.servicecomb.core.Const; |
| import org.apache.servicecomb.core.Handler; |
| import org.apache.servicecomb.core.Invocation; |
| import org.apache.servicecomb.swagger.invocation.AsyncResponse; |
| import org.apache.servicecomb.swagger.invocation.exception.CommonExceptionData; |
| import org.apache.servicecomb.swagger.invocation.exception.InvocationException; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| public class ProviderQpsFlowControlHandler implements Handler { |
| |
| private final QpsControllerManager qpsControllerMgr = new QpsControllerManager(true); |
| |
| @Override |
| public void handle(Invocation invocation, AsyncResponse asyncResp) throws Exception { |
| if (invocation.getHandlerIndex() > 0) { |
| // handlerIndex > 0, which means this handler is executed in handler chain. |
| // As this flow control logic has been executed in advance, this time it should be ignored. |
| invocation.next(asyncResp); |
| return; |
| } |
| |
| // The real executing position of this handler is no longer in handler chain, but in AbstractRestInvocation. |
| // Therefore, the Invocation#next() method should not be called below. |
| if (!Config.INSTANCE.isProviderEnabled()) { |
| return; |
| } |
| |
| String microserviceName = invocation.getContext(Const.SRC_MICROSERVICE); |
| QpsStrategy qpsStrategy = qpsControllerMgr.getOrCreate(microserviceName, invocation); |
| checkRequestRateLimited(qpsStrategy, asyncResp); |
| } |
| |
| private void checkRequestRateLimited(QpsStrategy qpsStrategy, AsyncResponse asyncResp) { |
| if (qpsStrategy.isLimitNewRequest()) { |
| CommonExceptionData errorData = new CommonExceptionData( |
| "provider request rejected by qps flowcontrol"); |
| asyncResp.producerFail(new InvocationException(QpsConst.TOO_MANY_REQUESTS_STATUS, errorData)); |
| } |
| } |
| |
| @VisibleForTesting |
| public QpsControllerManager getQpsControllerMgr() { |
| return qpsControllerMgr; |
| } |
| } |