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From GitBox <...@apache.org>
Subject [GitHub] wujimin commented on a change in pull request #543: [SCB-324] Fault-Injection handler implementation
Date Wed, 28 Feb 2018 03:03:21 GMT
wujimin commented on a change in pull request #543: [SCB-324] Fault-Injection handler implementation
URL: https://github.com/apache/incubator-servicecomb-java-chassis/pull/543#discussion_r171132452
 
 

 ##########
 File path: handlers/handler-fault-injection/src/main/java/org/apache/servicecomb/faultinjection/FaultInjectionHandler.java
 ##########
 @@ -0,0 +1,222 @@
+/*
+ * 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.faultinjection;
+
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+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.context.HttpStatus;
+import org.apache.servicecomb.swagger.invocation.exception.CommonExceptionData;
+import org.apache.servicecomb.swagger.invocation.exception.InvocationException;
+import static org.apache.servicecomb.faultinjection.FaultInjectionConst.*;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Fault injection handler which injects the delay/abort for requests based on
+ * the percentage configured in service file.
+ *
+ */
+public class FaultInjectionHandler implements Handler {
+  private static final Logger LOGGER = LoggerFactory.getLogger(FaultInjectionHandler.class);
+
+  @Override
+  public void handle(Invocation invocation, AsyncResponse asyncResp) throws Exception {
+
+    //if no transport then call next handler.
+    if ((invocation.getTransport() != null) && (invocation.getTransport().getName()
!= null)) {
+
+      // prepare the key and lookup for request count.
+      String key = invocation.getTransport().getName() + invocation.getMicroserviceQualifiedName();
+
+      AtomicLong reqCount = FaultInjectionUtil.getOperMetTotalReq(key);
+      long reqCountCurrent = reqCount.get();
+      // increment the request count here after checking the delay/abort condition.
+      reqCount.incrementAndGet();
+
+      // get the config values related to delay percentage.
+      int delayPercent = getFaultInjectionConfig(invocation,
+          "delay.percent",
+          FAULT_INJECTION_DELAY_PERCENTAGE_DEFAULT);
+
+      // check fault delay condition.
+      boolean isDelay = checkFaultInjectionDelayAndAbort(reqCountCurrent, delayPercent);
+      if (isDelay) {
+        LOGGER.info("delay is added for the request by fault inject handler");
+        long delay = getFaultInjectionConfig(invocation,
+            "delay.fixedDelay",
+            FAULT_INJECTION_DELAY_DEFAULT);
+
+        Thread.sleep(delay);
+      }
+
+      // get the config values related to delay.
+      int abortPercent = getFaultInjectionConfig(invocation,
+          "abort.percent",
+          FAULT_INJECTION_ABORT_PERCENTAGE_DEFAULT);
+
+      // check fault delay condition.
+      boolean isAbort = checkFaultInjectionDelayAndAbort(reqCountCurrent, abortPercent);
+      if (isAbort) {
+        // get the config values related to delay percentage.
+        int errorCode = getFaultInjectionConfig(invocation,
+            "abort.httpStatus",
+            FAULT_INJECTION_ABORT_ERROR_MSG_DEFAULT);
+        // if request need to be abort then return failure with given error code
+        CommonExceptionData errorData = new CommonExceptionData("aborted by fault inject");
+        asyncResp.consumerFail(
+            new InvocationException(new HttpStatus(errorCode, "aborted by fault inject"),
errorData));
+        return;
+      }
+    }
+
+    // if no delay and no abort then continue to next handler.
+    invocation.next(asyncResp);
+  }
+
+  /**
+   * It will check the delay/abort condition based on request count and percentage
+   * received.
+   * 
+   * @param reqCount
+   * @param percentage
+   * @param key
+   * @return true/false
+   */
+  private boolean checkFaultInjectionDelayAndAbort(long reqCount, int percentage) {
+    /*
+     * Example: delay/abort percentage configured is 10% and Get the count(suppose
+     * if it is 10th request) from map and calculate resultNew(10th request) and
+     * requestOld(9th request). Like this for every request it will calculate
+     * current request count and previous count. if both not matched need to add
+     * delay/abort otherwise no need to add.
+     */
+
+    // calculate the value with current request count.
+    long resultNew = (reqCount * percentage) / 100;
+
+    // calculate the value with previous count value.
+    long resultOld = ((reqCount - 1) * percentage) / 100;
+
+    // if both are not matching then delay/abort should be added.
+    if (resultNew != resultOld) {
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Handles the reading fault injection configuration.
+   * 
+   * @param invocation
+   *            invocation of request
+   * @param key
+   *            configuration key
+   * @return configuration value
+   */
+  private int getFaultInjectionConfig(Invocation invocation, String key, int defaultValue)
{
+    int value = 0;
+    String config;
+    FaultInjectionConfig faultCfg = new FaultInjectionConfig();
+
+    //first need to check in config center map which has high priority.
+    Map<String, AtomicInteger> cfgMap = FaultInjectionUtil.getConfigCenterMap();
+
+    // get the config base on priority. operationName-->schema-->service-->global
+    String operationName = invocation.getOperationName();
+    String schema = invocation.getSchemaId();
+    String serviceName = invocation.getMicroserviceName();
+
+    if (operationName != null && schema != null && serviceName != null) {
+      if (invocation.getTransport().getName().equals(FAULTINJECTION_HIGHWAY_TRANSPORT)) {
 
 Review comment:
   why not just use invocation.getTransport().getName()
   
   if use the "if" logic, and if add new transport in the furture,  this place should be modified
too.

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