[GitHub] [servicecomb-java-chassis] liubao68 commented on a change in pull request #2342: [SCB-2251] make exception processor extendable

[GitBox <gi...@apache.org>]

liubao68 commented on a change in pull request #2342:
URL: https://github.com/apache/servicecomb-java-chassis/pull/2342#discussion_r606025764



##########
File path: core/src/main/java/org/apache/servicecomb/core/exception/DefaultExceptionProcessor.java
##########
@@ -0,0 +1,206 @@
+/*
+ * 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.core.exception;
+
+import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
+import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
+import static javax.ws.rs.core.Response.Status.TOO_MANY_REQUESTS;
+import static org.apache.commons.lang3.exception.ExceptionUtils.getStackTrace;
+import static org.apache.servicecomb.core.exception.ExceptionCodes.GENERIC_SERVER;
+import static org.apache.servicecomb.swagger.invocation.InvocationType.CONSUMER;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.ws.rs.core.Response.StatusType;
+
+import org.apache.servicecomb.config.inject.InjectProperties;
+import org.apache.servicecomb.config.inject.InjectProperty;
+import org.apache.servicecomb.core.Invocation;
+import org.apache.servicecomb.foundation.common.concurrent.ConcurrentHashMapEx;
+import org.apache.servicecomb.foundation.common.utils.ExceptionUtils;
+import org.apache.servicecomb.foundation.common.utils.SPIServiceUtils;
+import org.apache.servicecomb.swagger.invocation.Response;
+import org.apache.servicecomb.swagger.invocation.exception.CommonExceptionData;
+import org.apache.servicecomb.swagger.invocation.exception.ExceptionFactory;
+import org.apache.servicecomb.swagger.invocation.exception.InvocationException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+@InjectProperties(prefix = "servicecomb.invocation.exception")
+public class DefaultExceptionProcessor implements ExceptionProcessor {
+  private static final Logger LOGGER = LoggerFactory.getLogger(DefaultExceptionProcessor.class);
+
+  public static final int ORDER = Integer.MAX_VALUE;
+
+  @SuppressWarnings("unchecked")
+  private final List<ExceptionConverter<Throwable>> converters = SPIServiceUtils
+      .getOrLoadSortedService(ExceptionConverter.class).stream()
+      .map(converter -> (ExceptionConverter<Throwable>) converter)
+      .collect(Collectors.toList());
+
+  @InjectProperty(
+      prefix = "servicecomb",
+      keys = {
+          "invocation.exception.print-stack-trace",
+          "exception.invocation.print-stack-trace"
+      },
+      defaultValue = "false")
+  protected boolean printStackTrace;
+
+  @InjectProperty(keys = "print-rate-limit", defaultValue = "false")
+  protected boolean printRateLimit;
+
+  private final Map<Class<?>, ExceptionConverter<Throwable>> converterCache = new ConcurrentHashMapEx<>();
+
+  @Override
+  public int getOrder() {
+    return ORDER;
+  }
+
+  @Override
+  public boolean isPrintStackTrace() {
+    return printStackTrace;
+  }
+
+  public DefaultExceptionProcessor setPrintStackTrace(boolean printStackTrace) {
+    this.printStackTrace = printStackTrace;
+    return this;
+  }
+
+  public boolean isPrintRateLimit() {
+    return printRateLimit;
+  }
+
+  public DefaultExceptionProcessor setPrintRateLimit(boolean printRateLimit) {
+    this.printRateLimit = printRateLimit;
+    return this;
+  }
+
+  @SuppressWarnings("unchecked")
+  @Autowired(required = false)
+  public DefaultExceptionProcessor setConverters(List<ExceptionConverter<? extends Throwable>> converters) {
+    converters.forEach(converter -> this.converters.add((ExceptionConverter<Throwable>) converter));
+    this.converters.sort(Comparator.comparingInt(ExceptionConverter::getOrder));
+    this.converterCache.clear();
+    return this;
+  }
+
+  @Override
+  public InvocationException convert(@Nonnull Invocation invocation, Throwable throwable) {
+    StatusType genericStatus = CONSUMER.equals(invocation.getInvocationType()) ? BAD_REQUEST : INTERNAL_SERVER_ERROR;
+    return convert(invocation, throwable, genericStatus);
+  }
+
+  @Override
+  public InvocationException convert(@Nullable Invocation invocation, Throwable throwable, StatusType genericStatus) {
+    Throwable unwrapped = ExceptionFactory.unwrap(throwable);
+    try {
+      return converterCache.computeIfAbsent(unwrapped.getClass(), clazz -> findConverter(unwrapped))
+          .convert(invocation, unwrapped, genericStatus);
+    } catch (Exception e) {
+      LOGGER.error("BUG: ExceptionConverter.convert MUST not throw exception, please fix it.\n"
+              + "original exception :{}"
+              + "converter exception:{}",

Review comment:
       add blank `converter exception` -> `converter exception `




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