refactor: removes the request forwarding logic for the configuration module
This commit is contained in:
chuntaojun
parent
c6ff9031c5
commit
c615699933
@ -16,7 +16,7 @@
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package com.alibaba.nacos.config.server.configuration;
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package com.alibaba.nacos.config.server.configuration;
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import com.alibaba.nacos.config.server.filter.NacosWebFilter;
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import com.alibaba.nacos.config.server.filter.NacosWebFilter;
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import com.alibaba.nacos.config.server.filter.TransferToLeaderFilter;
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import com.alibaba.nacos.config.server.filter.CurcuitFilter;
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import org.springframework.boot.web.servlet.FilterRegistrationBean;
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import org.springframework.boot.web.servlet.FilterRegistrationBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Conditional;
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import org.springframework.context.annotation.Conditional;
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@ -49,18 +49,18 @@ public class NacosConfigConfiguration {
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@Conditional(ConditionDistributedEmbedStorage.class)
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@Conditional(ConditionDistributedEmbedStorage.class)
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@Bean
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@Bean
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public FilterRegistrationBean transferToLeaderRegistration() {
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public FilterRegistrationBean transferToLeaderRegistration() {
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FilterRegistrationBean<TransferToLeaderFilter> registration = new FilterRegistrationBean<>();
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FilterRegistrationBean<CurcuitFilter> registration = new FilterRegistrationBean<>();
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registration.setFilter(transferToLeader());
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registration.setFilter(transferToLeader());
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registration.addUrlPatterns("/v1/cs/*");
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registration.addUrlPatterns("/v1/cs/*");
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registration.setName("transferToLeader");
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registration.setName("curcuitFilter");
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registration.setOrder(6);
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registration.setOrder(6);
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return registration;
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return registration;
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}
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}
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@Conditional(ConditionDistributedEmbedStorage.class)
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@Conditional(ConditionDistributedEmbedStorage.class)
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@Bean
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@Bean
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public TransferToLeaderFilter transferToLeader() {
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public CurcuitFilter transferToLeader() {
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return new TransferToLeaderFilter();
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return new CurcuitFilter();
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}
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}
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}
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}
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@ -0,0 +1,159 @@
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/*
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* Copyright 1999-2018 Alibaba Group Holding Ltd.
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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 com.alibaba.nacos.config.server.filter;
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import com.alibaba.nacos.common.utils.ExceptionUtil;
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import com.alibaba.nacos.common.utils.HttpMethod;
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import com.alibaba.nacos.common.utils.Observable;
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import com.alibaba.nacos.common.utils.Observer;
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import com.alibaba.nacos.config.server.constant.Constants;
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import com.alibaba.nacos.config.server.model.event.RaftDBErrorEvent;
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import com.alibaba.nacos.config.server.model.event.RaftDBErrorRecoverEvent;
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import com.alibaba.nacos.config.server.utils.LogUtil;
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import com.alibaba.nacos.consistency.cp.CPProtocol;
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import com.alibaba.nacos.core.cluster.Member;
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import com.alibaba.nacos.core.cluster.MemberMetaDataConstants;
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import com.alibaba.nacos.core.cluster.ServerMemberManager;
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import com.alibaba.nacos.core.code.ControllerMethodsCache;
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import com.alibaba.nacos.core.notify.Event;
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import com.alibaba.nacos.core.notify.NotifyCenter;
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import com.alibaba.nacos.core.notify.listener.SmartSubscribe;
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import org.springframework.beans.factory.annotation.Autowired;
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import javax.annotation.PostConstruct;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.security.AccessControlException;
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import java.util.List;
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/**
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* If the embedded distributed storage is enabled, all requests are routed to the Leader
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* node for processing, and the maximum number of forwards for a single request cannot
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* exceed three
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*
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* @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
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*/
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@SuppressWarnings("all")
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public class CurcuitFilter implements Filter {
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@Autowired
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private ServerMemberManager memberManager;
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@Autowired
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private CPProtocol protocol;
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@Autowired
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private ControllerMethodsCache controllerMethodsCache;
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private volatile boolean downgrading = false;
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private volatile boolean openService = false;
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@PostConstruct
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protected void init() {
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listenerSelfInCluster();
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registerSubscribe();
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response,
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FilterChain chain) throws IOException, ServletException {
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HttpServletRequest req = (HttpServletRequest) request;
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HttpServletResponse resp = (HttpServletResponse) response;
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if (!openService) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"In the node initialization, unable to process any requests at this time");
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return;
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}
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try {
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// If an unrecoverable exception occurs on this node, the write request operation shall not be processed
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// This is a very important warning message !!!
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if (downgrading) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"Unable to process the request at this time: System triggered degradation");
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return;
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}
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chain.doFilter(req, response);
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}
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catch (AccessControlException e) {
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resp.sendError(HttpServletResponse.SC_FORBIDDEN,
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"access denied: " + ExceptionUtil.getAllExceptionMsg(e));
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return;
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}
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catch (Throwable e) {
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resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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"Server failed," + e.toString());
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return;
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}
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}
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@Override
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public void destroy() {
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}
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private void listenerSelfInCluster() {
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protocol.protocolMetaData().subscribe(Constants.CONFIG_MODEL_RAFT_GROUP,
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com.alibaba.nacos.consistency.cp.Constants.RAFT_GROUP_MEMBER,
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new Observer() {
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@Override
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public void update(Observable o, Object arg) {
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final List<String> peers = (List<String>) arg;
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final Member self = memberManager.getSelf();
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final String raftAddress = self.getIp() + ":" + self
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.getExtendVal(MemberMetaDataConstants.RAFT_PORT);
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// Only when you are in the cluster and the current Leader is
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// elected can you provide external services
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openService = peers.contains(raftAddress);
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}
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});
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}
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private void registerSubscribe() {
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NotifyCenter.registerSubscribe(new SmartSubscribe() {
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@Override
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public void onEvent(Event event) {
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// @JustForTest
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// This event only happens in the case of unit tests
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if (event instanceof RaftDBErrorRecoverEvent) {
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downgrading = false;
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return;
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}
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if (event instanceof RaftDBErrorEvent) {
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downgrading = true;
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}
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}
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@Override
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public boolean canNotify(Event event) {
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return (event instanceof RaftDBErrorEvent)
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|| (event instanceof RaftDBErrorRecoverEvent);
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}
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});
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}
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}
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@ -1,280 +0,0 @@
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/*
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* Copyright 1999-2018 Alibaba Group Holding Ltd.
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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 com.alibaba.nacos.config.server.filter;
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import com.alibaba.nacos.common.http.param.MediaType;
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import com.alibaba.nacos.common.utils.ExceptionUtil;
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import com.alibaba.nacos.common.utils.Observable;
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import com.alibaba.nacos.common.utils.Observer;
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import com.alibaba.nacos.config.server.constant.Constants;
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import com.alibaba.nacos.config.server.model.event.RaftDBErrorEvent;
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import com.alibaba.nacos.config.server.model.event.RaftDBErrorRecoverEvent;
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import com.alibaba.nacos.config.server.utils.LogUtil;
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import com.alibaba.nacos.consistency.cp.CPProtocol;
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import com.alibaba.nacos.core.cluster.Member;
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import com.alibaba.nacos.core.cluster.MemberMetaDataConstants;
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import com.alibaba.nacos.core.cluster.ServerMemberManager;
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import com.alibaba.nacos.core.code.ControllerMethodsCache;
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import com.alibaba.nacos.core.notify.Event;
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import com.alibaba.nacos.core.notify.NotifyCenter;
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import com.alibaba.nacos.core.notify.listener.SmartSubscribe;
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import com.alibaba.nacos.core.utils.ReuseHttpRequest;
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import com.alibaba.nacos.core.utils.ReuseHttpServletRequest;
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import com.alibaba.nacos.core.utils.ReuseUploadFileHttpServletRequest;
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import com.alibaba.nacos.core.utils.WebUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.client.RestTemplate;
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import javax.annotation.PostConstruct;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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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.security.AccessControlException;
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import java.util.Enumeration;
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import java.util.List;
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import java.util.Map;
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/**
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* If the embedded distributed storage is enabled, all requests are routed to the Leader
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* node for processing, and the maximum number of forwards for a single request cannot
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* exceed three
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*
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* @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
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*/
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@SuppressWarnings("all")
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public class TransferToLeaderFilter implements Filter {
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@Autowired
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private ServerMemberManager memberManager;
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@Autowired
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private CPProtocol protocol;
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@Autowired
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private ControllerMethodsCache controllerMethodsCache;
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private volatile String leaderServer = "";
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private static final int MAX_TRANSFER_CNT = Integer
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.getInteger("nacos.config.transfer-leader.max-num", 1);
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private final RestTemplate restTemplate = new RestTemplate();
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private volatile boolean downgrading = false;
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private volatile boolean openService = false;
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@PostConstruct
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protected void init() {
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LogUtil.defaultLog.info("Open the request and forward it to the leader");
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listenerLeaderStatus();
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listenerSelfInCluster();
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registerSubscribe();
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response,
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FilterChain chain) throws IOException, ServletException {
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ReuseHttpRequest req = null;
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HttpServletResponse resp = (HttpServletResponse) response;
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if (!openService) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"In the node initialization, unable to process any requests at this time");
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return;
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}
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String urlString = ((HttpServletRequest) request).getRequestURI();
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if (StringUtils.containsIgnoreCase(request.getContentType(),
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MediaType.MULTIPART_FORM_DATA)) {
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req = new ReuseUploadFileHttpServletRequest((HttpServletRequest) request);
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}
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else {
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req = new ReuseHttpServletRequest((HttpServletRequest) request);
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}
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if (StringUtils.isNotBlank(req.getQueryString())) {
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urlString += "?" + req.getQueryString();
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}
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try {
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String path = new URI(req.getRequestURI()).getPath();
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Method method = controllerMethodsCache.getMethod(req.getMethod(), path);
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if (method == null) {
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throw new NoSuchMethodException(req.getMethod() + " " + path);
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}
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// Determine if the system degradation was triggered
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// System demotion is enabled and all requests are forwarded to the leader node
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boolean isLeader = protocol.isLeader(Constants.CONFIG_MODEL_RAFT_GROUP);
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if (downgrading && isLeader) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"Unable to process the request at this time: System triggered degradation");
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return;
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}
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if (downgrading || (method.isAnnotationPresent(ToLeader.class)
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&& !isLeader)) {
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if (StringUtils.isBlank(leaderServer)) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"Unable to process the request at this time: no Leader");
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return;
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}
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final String val = req.getHeader(Constants.FORWARD_LEADER);
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final int transferCnt =
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Integer.parseInt(StringUtils.isEmpty(val) ? "0" : val) + 1;
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// Requests can only be forwarded once if a downgrade is not triggered
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if (transferCnt > MAX_TRANSFER_CNT && !downgrading) {
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resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"Exceeded forwarding times:" + req.getMethod() + ":" + req
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.getRequestURI());
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return;
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}
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if (urlString.startsWith("/")) {
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urlString = urlString.substring(1);
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}
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final String reqUrl =
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req.getScheme() + "://" + leaderServer + "/" + urlString;
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final HttpHeaders headers = new HttpHeaders();
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final Enumeration<String> headerNames = req.getHeaderNames();
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headers.set(Constants.FORWARD_LEADER, String.valueOf(transferCnt));
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while (headerNames.hasMoreElements()) {
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String headerName = headerNames.nextElement();
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headers.set(headerName, req.getHeader(headerName));
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}
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System.out.println(reqUrl);
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HttpEntity<Object> httpEntity = new HttpEntity<>(req.getBody(), headers);
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ResponseEntity<String> result = restTemplate
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|
||||||
.exchange(reqUrl, HttpMethod.resolve(req.getMethod()), httpEntity,
|
|
||||||
String.class);
|
|
||||||
WebUtils.response(resp, result.getBody(), result.getStatusCodeValue());
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
chain.doFilter(req, response);
|
|
||||||
}
|
|
||||||
catch (AccessControlException e) {
|
|
||||||
resp.sendError(HttpServletResponse.SC_FORBIDDEN,
|
|
||||||
"access denied: " + ExceptionUtil.getAllExceptionMsg(e));
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
catch (NoSuchMethodException e) {
|
|
||||||
resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED,
|
|
||||||
"no such api:" + req.getMethod() + ":" + req.getRequestURI());
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
catch (Exception e) {
|
|
||||||
LogUtil.defaultLog
|
|
||||||
.error("An exception occurred when the request was forwarded to the Leader {}, error {}",
|
|
||||||
leaderServer, e);
|
|
||||||
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
|
|
||||||
"Server failed," + e.toString());
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
@Override
|
|
||||||
public void destroy() {
|
|
||||||
|
|
||||||
}
|
|
||||||
|
|
||||||
private void listenerLeaderStatus() {
|
|
||||||
protocol.protocolMetaData().subscribe(Constants.CONFIG_MODEL_RAFT_GROUP,
|
|
||||||
com.alibaba.nacos.consistency.cp.Constants.LEADER_META_DATA,
|
|
||||||
new Observer() {
|
|
||||||
@Override
|
|
||||||
public void update(Observable o, Object arg) {
|
|
||||||
final String raftLeader = String.valueOf(arg);
|
|
||||||
boolean found = false;
|
|
||||||
for (Map.Entry<String, Member> entry : memberManager
|
|
||||||
.getServerList().entrySet()) {
|
|
||||||
final Member member = entry.getValue();
|
|
||||||
final String raftAddress = member.getIp() + ":" + member
|
|
||||||
.getExtendVal(MemberMetaDataConstants.RAFT_PORT);
|
|
||||||
if (StringUtils.equals(raftLeader, raftAddress)) {
|
|
||||||
leaderServer = entry.getKey();
|
|
||||||
found = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
if (!found) {
|
|
||||||
leaderServer = "";
|
|
||||||
}
|
|
||||||
}
|
|
||||||
});
|
|
||||||
}
|
|
||||||
|
|
||||||
private void listenerSelfInCluster() {
|
|
||||||
protocol.protocolMetaData().subscribe(Constants.CONFIG_MODEL_RAFT_GROUP,
|
|
||||||
com.alibaba.nacos.consistency.cp.Constants.RAFT_GROUP_MEMBER,
|
|
||||||
new Observer() {
|
|
||||||
@Override
|
|
||||||
public void update(Observable o, Object arg) {
|
|
||||||
final List<String> peers = (List<String>) arg;
|
|
||||||
final Member self = memberManager.getSelf();
|
|
||||||
final String raftAddress = self.getIp() + ":" + self
|
|
||||||
.getExtendVal(MemberMetaDataConstants.RAFT_PORT);
|
|
||||||
// Only when you are in the cluster and the current Leader is
|
|
||||||
// elected can you provide external services
|
|
||||||
openService = peers.contains(raftAddress)
|
|
||||||
&& StringUtils.isNotBlank(leaderServer);
|
|
||||||
}
|
|
||||||
});
|
|
||||||
}
|
|
||||||
|
|
||||||
private void registerSubscribe() {
|
|
||||||
NotifyCenter.registerSubscribe(new SmartSubscribe() {
|
|
||||||
|
|
||||||
@Override
|
|
||||||
public void onEvent(Event event) {
|
|
||||||
if (event instanceof RaftDBErrorRecoverEvent) {
|
|
||||||
downgrading = false;
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
if (event instanceof RaftDBErrorEvent) {
|
|
||||||
downgrading = true;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
@Override
|
|
||||||
public boolean canNotify(Event event) {
|
|
||||||
return (event instanceof RaftDBErrorEvent)
|
|
||||||
|| (event instanceof RaftDBErrorRecoverEvent);
|
|
||||||
}
|
|
||||||
});
|
|
||||||
}
|
|
||||||
|
|
||||||
}
|
|
||||||
@ -20,7 +20,6 @@ import com.alibaba.nacos.common.JustForTest;
|
|||||||
import com.alibaba.nacos.core.notify.Event;
|
import com.alibaba.nacos.core.notify.Event;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
*
|
|
||||||
*
|
*
|
||||||
* @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
|
* @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
|
||||||
*/
|
*/
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user