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https://gitee.com/mirrors/Spring-Cloud-Alibaba.git
synced 2021-06-26 13:25:11 +08:00
Optimize usage of Sentinel RestTemplate
This commit is contained in:
fangjian0423
parent
cb7e7f1422
commit
8c661d051a
@ -19,10 +19,12 @@ package org.springframework.cloud.alibaba.sentinel.custom;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.net.URI;
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import java.util.Arrays;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.cloud.alibaba.sentinel.annotation.SentinelRestTemplate;
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import org.springframework.cloud.alibaba.sentinel.rest.SentinelClientHttpResponse;
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import org.springframework.http.HttpRequest;
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import org.springframework.http.client.ClientHttpRequestExecution;
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import org.springframework.http.client.ClientHttpRequestInterceptor;
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@ -37,7 +39,7 @@ import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
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import com.alibaba.csp.sentinel.util.StringUtil;
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/**
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* Interceptor using by SentinelRestTemplate and SentinelProtectInterceptor
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* Interceptor using by SentinelRestTemplate
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*
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* @author fangjian
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*/
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@ -60,7 +62,7 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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+ (uri.getPort() == -1 ? 80 : uri.getPort());
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String hostWithPathResource = hostResource + uri.getPath();
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Entry hostEntry = null, hostWithPathEntry = null;
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ClientHttpResponse response = null;
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ClientHttpResponse response;
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try {
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ContextUtil.enter(hostWithPathResource);
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hostWithPathEntry = SphU.entry(hostWithPathResource);
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@ -68,12 +70,15 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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response = execution.execute(request, body);
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}
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catch (BlockException e) {
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logger.error("RestTemplate block", e);
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try {
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handleBlockException(e);
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return handleBlockException(request, body, execution, e);
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}
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catch (Exception ex) {
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logger.error("sentinel handle BlockException error.", e);
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if (ex instanceof IllegalStateException) {
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throw (IllegalStateException) ex;
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}
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throw new IllegalStateException(
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"sentinel handle BlockException error: " + ex.getMessage(), ex);
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}
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}
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finally {
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@ -88,14 +93,18 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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return response;
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}
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private void handleBlockException(BlockException ex) throws Exception {
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Object[] args = new Object[] { ex };
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private ClientHttpResponse handleBlockException(HttpRequest request, byte[] body,
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ClientHttpRequestExecution execution, BlockException ex) throws Exception {
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Object[] args = new Object[] { request, body, execution, ex };
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// handle degrade
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if (isDegradeFailure(ex)) {
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Method method = extractFallbackMethod(sentinelRestTemplate.fallback(),
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sentinelRestTemplate.fallbackClass());
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if (method != null) {
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method.invoke(null, args);
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return (ClientHttpResponse) method.invoke(null, args);
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}
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else {
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return new SentinelClientHttpResponse();
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}
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}
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// handle block
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@ -103,7 +112,10 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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sentinelRestTemplate.blockHandler(),
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sentinelRestTemplate.blockHandlerClass());
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if (blockHandler != null) {
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blockHandler.invoke(null, args);
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return (ClientHttpResponse) blockHandler.invoke(null, args);
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}
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else {
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return new SentinelClientHttpResponse();
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}
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}
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@ -112,10 +124,25 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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return null;
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}
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Method cachedMethod = BlockClassRegistry.lookupFallback(fallbackClass, fallback);
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Class[] args = new Class[] { HttpRequest.class, byte[].class,
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ClientHttpRequestExecution.class, BlockException.class };
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if (cachedMethod == null) {
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cachedMethod = ClassUtils.getStaticMethod(fallbackClass, fallback,
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BlockException.class);
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BlockClassRegistry.updateFallbackFor(fallbackClass, fallback, cachedMethod);
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cachedMethod = ClassUtils.getStaticMethod(fallbackClass, fallback, args);
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if (cachedMethod != null) {
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if (!ClientHttpResponse.class
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.isAssignableFrom(cachedMethod.getReturnType())) {
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throw new IllegalStateException(String.format(
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"the return type of method [%s] in class [%s] is not ClientHttpResponse in degrade",
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cachedMethod.getName(), fallbackClass.getCanonicalName()));
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}
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BlockClassRegistry.updateFallbackFor(fallbackClass, fallback,
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cachedMethod);
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}
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else {
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throw new IllegalStateException(String.format(
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"Cannot find method [%s] in class [%s] with parameters %s in degrade",
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fallback, fallbackClass.getCanonicalName(), Arrays.asList(args)));
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}
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}
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return cachedMethod;
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}
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@ -125,10 +152,24 @@ public class SentinelProtectInterceptor implements ClientHttpRequestInterceptor
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return null;
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}
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Method cachedMethod = BlockClassRegistry.lookupBlockHandler(blockClass, block);
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Class[] args = new Class[] { HttpRequest.class, byte[].class,
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ClientHttpRequestExecution.class, BlockException.class };
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if (cachedMethod == null) {
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cachedMethod = ClassUtils.getStaticMethod(blockClass, block,
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BlockException.class);
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BlockClassRegistry.updateBlockHandlerFor(blockClass, block, cachedMethod);
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cachedMethod = ClassUtils.getStaticMethod(blockClass, block, args);
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if (cachedMethod != null) {
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if (!ClientHttpResponse.class
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.isAssignableFrom(cachedMethod.getReturnType())) {
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throw new IllegalStateException(String.format(
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"the return type of method [%s] in class [%s] is not ClientHttpResponse in flow control",
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cachedMethod.getName(), blockClass.getCanonicalName()));
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}
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BlockClassRegistry.updateBlockHandlerFor(blockClass, block, cachedMethod);
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}
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else {
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throw new IllegalStateException(String.format(
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"Cannot find method [%s] in class [%s] with parameters %s in flow control",
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block, blockClass.getCanonicalName(), Arrays.asList(args)));
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}
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}
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return cachedMethod;
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}
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@ -0,0 +1,71 @@
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/*
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* Copyright (C) 2018 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.cloud.alibaba.sentinel.rest;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.springframework.cloud.alibaba.sentinel.annotation.SentinelRestTemplate;
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import org.springframework.cloud.alibaba.sentinel.custom.SentinelProtectInterceptor;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.client.AbstractClientHttpResponse;
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/**
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* Using by {@link SentinelRestTemplate} and {@link SentinelProtectInterceptor}
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* @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
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*/
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public class SentinelClientHttpResponse extends AbstractClientHttpResponse {
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private final String BLOCK_STR = "RestTemplate request block by sentinel";
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@Override
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public int getRawStatusCode() throws IOException {
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return HttpStatus.OK.value();
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}
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@Override
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public String getStatusText() throws IOException {
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return BLOCK_STR;
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}
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@Override
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public void close() {
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// nothing do
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}
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@Override
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public InputStream getBody() throws IOException {
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return new ByteArrayInputStream(BLOCK_STR.getBytes());
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}
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@Override
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public HttpHeaders getHeaders() {
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Map<String, List<String>> headers = new HashMap<>();
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headers.put(HttpHeaders.CONTENT_TYPE,
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Arrays.asList(MediaType.APPLICATION_JSON_UTF8_VALUE));
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HttpHeaders httpHeaders = new HttpHeaders();
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httpHeaders.putAll(headers);
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return httpHeaders;
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}
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}
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