001/**
002 * Copyright (c) 2015-2022, Michael Yang 杨福海 (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.apache.org/licenses/LICENSE-2.0
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package io.jboot.support.sentinel;
017
018import com.alibaba.csp.sentinel.Entry;
019import com.alibaba.csp.sentinel.EntryType;
020import com.alibaba.csp.sentinel.SphU;
021import com.alibaba.csp.sentinel.annotation.SentinelResource;
022import com.alibaba.csp.sentinel.slots.block.BlockException;
023import com.jfinal.aop.Interceptor;
024import com.jfinal.aop.Invocation;
025
026/**
027 * @author michael yang (fuhai999@gmail.com)
028 * @Date: 2020/1/7
029 */
030public class SentinelInterceptor extends AbstractSentinelInterceptor implements Interceptor {
031
032    @Override
033    public void intercept(Invocation inv) {
034
035        SentinelResource annotation = inv.getMethod().getAnnotation(SentinelResource.class);
036        if (annotation == null) {
037            inv.invoke();
038            return;
039        }
040
041        String resourceName = getResourceName(annotation.value(), inv.getMethod());
042        EntryType entryType = annotation.entryType();
043        int resourceType = annotation.resourceType();
044        Entry entry = null;
045        try {
046            entry = SphU.entry(resourceName, resourceType, entryType, inv.getArgs());
047            inv.invoke();
048        } catch (BlockException ex) {
049            try {
050                inv.setReturnValue(handleBlockException(inv, annotation, ex));
051            } catch (Throwable throwable) {
052                if (inv.isActionInvocation()) {
053                    SentinelUtil.blockRequest(inv.getController().getRequest(), inv.getController().getResponse());
054                } else {
055                    throwable.printStackTrace();
056                }
057            }
058            return;
059        } catch (Throwable ex) {
060            Class<? extends Throwable>[] exceptionsToIgnore = annotation.exceptionsToIgnore();
061            // The ignore list will be checked first.
062            if (exceptionsToIgnore.length > 0 && exceptionBelongsTo(ex, exceptionsToIgnore)) {
063                throw ex;
064            }
065            if (exceptionBelongsTo(ex, annotation.exceptionsToTrace())) {
066                traceException(ex);
067                try {
068                    inv.setReturnValue(handleFallback(inv, annotation, ex));
069                } catch (Throwable throwable) {
070                    throwable.printStackTrace();
071                }
072                return;
073            }
074
075            // No fallback function can handle the exception, so throw it out.
076            throw ex;
077        } finally {
078            if (entry != null) {
079                entry.exit(1, inv.getArgs());
080            }
081        }
082    }
083
084
085}