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一、背景

最近在github上看了soul网关的设计，突然就来了兴趣准备自己从零开始写一个高性能的网关。经过两周时间的开发，我的网关ship-gate核心功能基本都已完成，最大的缺陷就是前端功底太差没有管理后台????。

二、设计

2.1 技术选型

网关是所有请求的入口，所以要求有很高的吞吐量，为了实现这点可以使用请求异步化来解决。目前一般有以下两种方案：

• Tomcat/Jetty+NIO+Servlet3

Servlet3已经支持异步，这种方案使用比较多，京东，有赞和Zuul，都用的是这种方案。

• Netty+NIO

Netty为高并发而生，目前唯品会的网关使用这个策略，在唯品会的技术文章中在相同的情况下Netty是每秒30w+的吞吐量，Tomcat是13w+,可以看出是有一定的差距的，但是Netty需要自己处理HTTP协议，这一块比较麻烦。

后面发现Soul网关是基于Spring WebFlux（底层Netty）的，不用太关心HTTP协议的处理，于是决定也用Spring WebFlux。

网关的第二个特点是具备可扩展性，比如Netflix Zuul有preFilters，postFilters等在不同的阶段方便处理不同的业务，基于责任链模式将请求进行链式处理即可实现。

在微服务架构下，服务都会进行多实例部署来保证高可用，请求到达网关时，网关需要根据URL找到所有可用的实例，这时就需要服务注册和发现功能，即注册中心。

现在流行的注册中心有Apache的Zookeeper和阿里的Nacos两种（consul有点小众），因为之前写RPC框架时已经用过了Zookeeper，所以这次就选择了Nacos。

2.2 需求清单

首先要明确目标，即开发一个具备哪些特性的网关，总结下后如下：

自定义路由规则

可基于version的路由规则设置，路由对象包括DEFAUL,HEADER和QUERY三种，匹配方式包括=、regex、like三种。

跨语言

HTTP协议天生跨语言

高性能

Netty本身就是一款高性能的通信框架，同时server将一些路由规则等数据缓存到JVM内存避免请求admin服务。

高可用

支持集群模式防止单节点故障，无状态。

灰度发布

灰度发布（又名金丝雀发布）是指在黑与白之间，能够平滑过渡的一种发布方式。在其上可以进行A/B testing，即让一部分用户继续用产品特性A，一部分用户开始用产品特性B，如果用户对B没有什么反对意见，那么逐步扩大范围，把所有用户都迁移到B上面来。通过特性一可以实现。

接口鉴权

基于责任链模式，用户开发自己的鉴权插件即可。

负载均衡

支持多种负载均衡算法，如随机，轮询，加权轮询等。利用SPI机制可以根据配置进行动态加载。

2.3 架构设计

在参考了一些优秀的网关Zuul,Spring Cloud Gateway,Soul后，将项目划分为以下几个模块。

它们之间的关系如图：

注意： 这张图与实际实现有点出入，Nacos push到本地缓存的那个环节没有实现，目前只有ship-sever定时轮询pull的过程。ship-admin从Nacos获取注册服务信息的过程，也改成了ServiceA启动时主动发生HTTP请求通知ship-admin。

2.4 表结构设计

三、编码

3.1 ship-client-spring-boot-starter

首先创建一个spring-boot-starter命名为ship-client-spring-boot-starter，不知道如何自定义starter的可以看我以前写的《开发自己的starter》。

其核心类 AutoRegisterListener 就是在项目启动时做了两件事：

1.将服务信息注册到Nacos注册中心

2.通知ship-admin服务上线了并注册下线hook。

代码如下：

* Created by 2YSP on 2020/12/21
*/
public class AutoRegisterListener implements ApplicationListener<ContextRefreshedEvent> {private final static Logger LOGGER = LoggerFactory.getLogger(AutoRegisterListener.class);private volatile AtomicBoolean registered = new AtomicBoolean(false);private final ClientConfigProperties properties;@NacosInjectedprivate NamingService namingService;@Autowiredprivate RequestMappingHandlerMapping handlerMapping;private final ExecutorService pool;/**
* url list to ignore
*/private static List<String> ignoreUrlList = new LinkedList<>();static {ignoreUrlList.add("/error");}public AutoRegisterListener(ClientConfigProperties properties) {if (!check(properties)) {LOGGER.error("client config port,contextPath,appName adminUrl and version can't be empty!");throw new ShipException("client config port,contextPath,appName adminUrl and version can't be empty!");}this.properties = properties;pool = new ThreadPoolExecutor(1, 4, 0, TimeUnit.SECONDS, new LinkedBlockingQueue<>());}/**
* check the ClientConfigProperties
*
* @param properties
* @return
*/private boolean check(ClientConfigProperties properties) {if (properties.getPort() == null| properties.getContextPath() == null| properties.getVersion() == null| properties.getAppName() == null| properties.getAdminUrl() == null) {return false;}return true;}@Overridepublic void onApplicationEvent(ContextRefreshedEvent event) {if (!registered.compareAndSet(false, true)) {return;}doRegister();registerShutDownHook();}/**
* send unregister request to admin when jvm shutdown
*/private void registerShutDownHook() {final String url = "http://" + properties.getAdminUrl() + AdminConstants.UNREGISTER_PATH;final UnregisterAppDTO unregisterAppDTO = new UnregisterAppDTO();unregisterAppDTO.setAppName(properties.getAppName());unregisterAppDTO.setVersion(properties.getVersion());unregisterAppDTO.setIp(IpUtil.getLocalIpAddress());unregisterAppDTO.setPort(properties.getPort());Runtime.getRuntime().addShutdownHook(new Thread(() -> {OkhttpTool.doPost(url, unregisterAppDTO);LOGGER.info("[{}:{}] unregister from ship-admin success!", unregisterAppDTO.getAppName(), unregisterAppDTO.getVersion());}));}/**
* register all interface info to register center
*/private void doRegister() {Instance instance = new Instance();instance.setIp(IpUtil.getLocalIpAddress());instance.setPort(properties.getPort());instance.setEphemeral(true);Map<String, String> metadataMap = new HashMap<>();metadataMap.put("version", properties.getVersion());metadataMap.put("appName", properties.getAppName());instance.setMetadata(metadataMap);try {namingService.registerInstance(properties.getAppName(), NacosConstants.APP_GROUP_NAME, instance);} catch (NacosException e) {LOGGER.error("register to nacos fail", e);throw new ShipException(e.getErrCode(), e.getErrMsg());}LOGGER.info("register interface info to nacos success!");// send register request to ship-adminString url = "http://" + properties.getAdminUrl() + AdminConstants.REGISTER_PATH;RegisterAppDTO registerAppDTO = buildRegisterAppDTO(instance);OkhttpTool.doPost(url, registerAppDTO);LOGGER.info("register to ship-admin success!");}private RegisterAppDTO buildRegisterAppDTO(Instance instance) {RegisterAppDTO registerAppDTO = new RegisterAppDTO();registerAppDTO.setAppName(properties.getAppName());registerAppDTO.setContextPath(properties.getContextPath());registerAppDTO.setIp(instance.getIp());registerAppDTO.setPort(instance.getPort());registerAppDTO.setVersion(properties.getVersion());return registerAppDTO;}
}

3.2 ship-server

ship-sever项目主要包括了两个部分内容， 1.请求动态路由的主流程 2.本地缓存数据和ship-admin及nacos同步，这部分在后面3.3再讲。

ship-server实现动态路由的原理是利用WebFilter拦截请求，然后将请求教给plugin chain去链式处理。

PluginFilter根据URL解析出appName，然后将启用的plugin组装成plugin chain。

public class PluginFilter implements WebFilter {private ServerConfigProperties properties;public PluginFilter(ServerConfigProperties properties) {this.properties = properties;}@Overridepublic Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {String appName = parseAppName(exchange);if (CollectionUtils.isEmpty(ServiceCache.getAllInstances(appName))) {throw new ShipException(ShipExceptionEnum.SERVICE_NOT_FIND);}PluginChain pluginChain = new PluginChain(properties, appName);pluginChain.addPlugin(new DynamicRoutePlugin(properties));pluginChain.addPlugin(new AuthPlugin(properties));return pluginChain.execute(exchange, pluginChain);}private String parseAppName(ServerWebExchange exchange) {RequestPath path = exchange.getRequest().getPath();String appName = path.value().split("/")[1];return appName;}
}```PluginChain继承了AbstractShipPlugin并持有所有要执行的插件。```java
* @Author: Ship
* @Description:
* @Date: Created in 2020/12/25
*/
public class PluginChain extends AbstractShipPlugin {/**
* the pos point to current plugin
*/private int pos;/**
* the plugins of chain
*/private List<ShipPlugin> plugins;private final String appName;public PluginChain(ServerConfigProperties properties, String appName) {super(properties);this.appName = appName;}/**
* add enabled plugin to chain
*
* @param shipPlugin
*/public void addPlugin(ShipPlugin shipPlugin) {if (plugins == null) {plugins = new ArrayList<>();}if (!PluginCache.isEnabled(appName, shipPlugin.name())) {return;}plugins.add(shipPlugin);// order by the plugin's orderplugins.sort(Comparator.comparing(ShipPlugin::order));}@Overridepublic Integer order() {return null;}@Overridepublic String name() {return null;}@Overridepublic Mono<Void> execute(ServerWebExchange exchange, PluginChain pluginChain) {if (pos == plugins.size()) {return exchange.getResponse().setComplete();}return pluginChain.plugins.get(pos++).execute(exchange, pluginChain);}public String getAppName() {return appName;}}

AbstractShipPlugin实现了ShipPlugin接口，并持有ServerConfigProperties配置对象。

public abstract class AbstractShipPlugin implements ShipPlugin {protected ServerConfigProperties properties;public AbstractShipPlugin(ServerConfigProperties properties) {this.properties = properties;}
}```ShipPlugin接口定义了所有插件必须实现的三个方法order(),name()和execute()。```java
public interface ShipPlugin {/**
* lower values have higher priority
*
* @return
*/Integer order();/**
* return current plugin name
*
* @return
*/String name();Mono<Void> execute(ServerWebExchange exchange,PluginChain pluginChain);}```DynamicRoutePlugin继承了抽象类AbstractShipPlugin，包含了动态路由的主要业务逻辑。```java
* @Author: Ship
* @Description:
* @Date: Created in 2020/12/25
*/
public class DynamicRoutePlugin extends AbstractShipPlugin {private final static Logger LOGGER = LoggerFactory.getLogger(DynamicRoutePlugin.class);private static WebClient webClient;private static final Gson gson = new GsonBuilder().create();static {HttpClient httpClient = HttpClient.create().tcpConfiguration(client ->client.doOnConnected(conn ->conn.addHandlerLast(new ReadTimeoutHandler(3)).addHandlerLast(new WriteTimeoutHandler(3))).option(ChannelOption.TCP_NODELAY, true));webClient = WebClient.builder().clientConnector(new ReactorClientHttpConnector(httpClient)).build();}public DynamicRoutePlugin(ServerConfigProperties properties) {super(properties);}@Overridepublic Integer order() {return ShipPluginEnum.DYNAMIC_ROUTE.getOrder();}@Overridepublic String name() {return ShipPluginEnum.DYNAMIC_ROUTE.getName();}@Overridepublic Mono<Void> execute(ServerWebExchange exchange, PluginChain pluginChain) {String appName = pluginChain.getAppName();ServiceInstance serviceInstance = chooseInstance(appName, exchange.getRequest());
//        LOGGER.info("selected instance is [{}]", gson.toJson(serviceInstance));// request serviceString url = buildUrl(exchange, serviceInstance);return forward(exchange, url);}/**
* forward request to backend service
*
* @param exchange
* @param url
* @return
*/private Mono<Void> forward(ServerWebExchange exchange, String url) {ServerHttpRequest request = exchange.getRequest();ServerHttpResponse response = exchange.getResponse();HttpMethod method = request.getMethod();WebClient.RequestBodySpec requestBodySpec = webClient.method(method).uri(url).headers((headers) -> {headers.addAll(request.getHeaders());});WebClient.RequestHeadersSpec<?> reqHeadersSpec;if (requireHttpBody(method)) {reqHeadersSpec = requestBodySpec.body(BodyInserters.fromDataBuffers(request.getBody()));} else {reqHeadersSpec = requestBodySpec;}// nio->callback->nioreturn reqHeadersSpec.exchange().timeout(Duration.ofMillis(properties.getTimeOutMillis())).onErrorResume(ex -> {return Mono.defer(() -> {String errorResultJson = "";if (ex instanceof TimeoutException) {errorResultJson = "{\"code\":5001,\"message\":\"network timeout\"}";} else {errorResultJson = "{\"code\":5000,\"message\":\"system error\"}";}return ShipResponseUtil.doResponse(exchange, errorResultJson);}).then(Mono.empty());}).flatMap(backendResponse -> {response.setStatusCode(backendResponse.statusCode());response.getHeaders().putAll(backendResponse.headers().asHttpHeaders());return response.writeWith(backendResponse.bodyToFlux(DataBuffer.class));});}/**
* weather the http method need http body
*
* @param method
* @return
*/private boolean requireHttpBody(HttpMethod method) {if (method.equals(HttpMethod.POST)| method.equals(HttpMethod.PUT)| method.equals(HttpMethod.PATCH)) {return true;}return false;}private String buildUrl(ServerWebExchange exchange, ServiceInstance serviceInstance) {ServerHttpRequest request = exchange.getRequest();String query = request.getURI().getQuery();String path = request.getPath().value().replaceFirst("/" + serviceInstance.getAppName(), "");String url = "http://" + serviceInstance.getIp() + ":" + serviceInstance.getPort() + path;if (!StringUtils.isEmpty(query)) {url = url + "?" + query;}return url;}/**
* choose an ServiceInstance according to route rule config and load balancing algorithm
*
* @param appName
* @param request
* @return
*/private ServiceInstance chooseInstance(String appName, ServerHttpRequest request) {List<ServiceInstance> serviceInstances = ServiceCache.getAllInstances(appName);if (CollectionUtils.isEmpty(serviceInstances)) {LOGGER.error("service instance of {} not find", appName);throw new ShipException(ShipExceptionEnum.SERVICE_NOT_FIND);}String version = matchAppVersion(appName, request);if (StringUtils.isEmpty(version)) {throw new ShipException("match app version error");}// filter serviceInstances by versionList<ServiceInstance> instances = serviceInstances.stream().filter(i -> i.getVersion().equals(version)).collect(Collectors.toList());//Select an instance based on the load balancing algorithmLoadBalance loadBalance = LoadBalanceFactory.getInstance(properties.getLoadBalance(), appName, version);ServiceInstance serviceInstance = loadBalance.chooseOne(instances);return serviceInstance;}private String matchAppVersion(String appName, ServerHttpRequest request) {List<AppRuleDTO> rules = RouteRuleCache.getRules(appName);rules.sort(Comparator.comparing(AppRuleDTO::getPriority).reversed());for (AppRuleDTO rule : rules) {if (match(rule, request)) {return rule.getVersion();}}return null;}private boolean match(AppRuleDTO rule, ServerHttpRequest request) {String matchObject = rule.getMatchObject();String matchKey = rule.getMatchKey();String matchRule = rule.getMatchRule();Byte matchMethod = rule.getMatchMethod();if (MatchObjectEnum.DEFAULT.getCode().equals(matchObject)) {return true;} else if (MatchObjectEnum.QUERY.getCode().equals(matchObject)) {String param = request.getQueryParams().getFirst(matchKey);if (!StringUtils.isEmpty(param)) {return StringTools.match(param, matchMethod, matchRule);}} else if (MatchObjectEnum.HEADER.getCode().equals(matchObject)) {HttpHeaders headers = request.getHeaders();String headerValue = headers.getFirst(matchKey);if (!StringUtils.isEmpty(headerValue)) {return StringTools.match(headerValue, matchMethod, matchRule);}}return false;}}

3.3 数据同步

app数据同步

后台服务（如订单服务）启动时，只将服务名，版本，ip地址和端口号注册到了Nacos，并没有实例的权重和启用的插件信息怎么办？

一般在线的实例权重和插件列表都是在管理界面配置，然后动态生效的，所以需要ship-admin定时更新实例的权重和插件信息到注册中心。

对应代码ship-admin的NacosSyncListener

* @Author: Ship
* @Description:
* @Date: Created in 2020/12/30
*/
@Configuration
public class NacosSyncListener implements ApplicationListener<ContextRefreshedEvent> {private static final Logger LOGGER = LoggerFactory.getLogger(NacosSyncListener.class);private static ScheduledThreadPoolExecutor scheduledPool = new ScheduledThreadPoolExecutor(1,new ShipThreadFactory("nacos-sync", true).create());@NacosInjectedprivate NamingService namingService;@Value("${nacos.discovery.server-addr}")private String baseUrl;@Resourceprivate AppService appService;@Overridepublic void onApplicationEvent(ContextRefreshedEvent event) {if (event.getApplicationContext().getParent() != null) {return;}String url = "http://" + baseUrl + NacosConstants.INSTANCE_UPDATE_PATH;scheduledPool.scheduleWithFixedDelay(new NacosSyncTask(namingService, url, appService), 0, 30L, TimeUnit.SECONDS);}class NacosSyncTask implements Runnable {private NamingService namingService;private String url;private AppService appService;private Gson gson = new GsonBuilder().create();public NacosSyncTask(NamingService namingService, String url, AppService appService) {this.namingService = namingService;this.url = url;this.appService = appService;}/**
* Regular update weight,enabled plugins to nacos instance
*/@Overridepublic void run() {try {// get all app namesListView<String> services = namingService.getServicesOfServer(1, Integer.MAX_VALUE, NacosConstants.APP_GROUP_NAME);if (CollectionUtils.isEmpty(services.getData())) {return;}List<String> appNames = services.getData();List<AppInfoDTO> appInfos = appService.getAppInfos(appNames);for (AppInfoDTO appInfo : appInfos) {if (CollectionUtils.isEmpty(appInfo.getInstances())) {continue;}for (ServiceInstance instance : appInfo.getInstances()) {Map<String, Object> queryMap = buildQueryMap(appInfo, instance);String resp = OkhttpTool.doPut(url, queryMap, "");LOGGER.debug("response :{}", resp);}}} catch (Exception e) {LOGGER.error("nacos sync task error", e);}}private Map<String, Object> buildQueryMap(AppInfoDTO appInfo, ServiceInstance instance) {Map<String, Object> map = new HashMap<>();map.put("serviceName", appInfo.getAppName());map.put("groupName", NacosConstants.APP_GROUP_NAME);map.put("ip", instance.getIp());map.put("port", instance.getPort());map.put("weight", instance.getWeight().doubleValue());NacosMetadata metadata = new NacosMetadata();metadata.setAppName(appInfo.getAppName());metadata.setVersion(instance.getVersion());metadata.setPlugins(String.join(",", appInfo.getEnabledPlugins()));map.put("metadata", StringTools.urlEncode(gson.toJson(metadata)));map.put("ephemeral", true);return map;}}
}

ship-server再定时从Nacos拉取app数据更新到本地Map缓存。

* @Author: Ship
* @Description: sync data to local cache
* @Date: Created in 2020/12/25
*/
@Configuration
public class DataSyncTaskListener implements ApplicationListener<ContextRefreshedEvent> {private static ScheduledThreadPoolExecutor scheduledPool = new ScheduledThreadPoolExecutor(1,new ShipThreadFactory("service-sync", true).create());@NacosInjectedprivate NamingService namingService;@Autowiredprivate ServerConfigProperties properties;@Overridepublic void onApplicationEvent(ContextRefreshedEvent event) {if (event.getApplicationContext().getParent() != null) {return;}scheduledPool.scheduleWithFixedDelay(new DataSyncTask(namingService), 0L, properties.getCacheRefreshInterval(), TimeUnit.SECONDS);WebsocketSyncCacheServer websocketSyncCacheServer = new WebsocketSyncCacheServer(properties.getWebSocketPort());websocketSyncCacheServer.start();}class DataSyncTask implements Runnable {private NamingService namingService;public DataSyncTask(NamingService namingService) {this.namingService = namingService;}@Overridepublic void run() {try {// get all app namesListView<String> services = namingService.getServicesOfServer(1, Integer.MAX_VALUE, NacosConstants.APP_GROUP_NAME);if (CollectionUtils.isEmpty(services.getData())) {return;}List<String> appNames = services.getData();// get all instancesfor (String appName : appNames) {List<Instance> instanceList = namingService.getAllInstances(appName, NacosConstants.APP_GROUP_NAME);if (CollectionUtils.isEmpty(instanceList)) {continue;}ServiceCache.add(appName, buildServiceInstances(instanceList));List<String> pluginNames = getEnabledPlugins(instanceList);PluginCache.add(appName, pluginNames);}ServiceCache.removeExpired(appNames);PluginCache.removeExpired(appNames);} catch (NacosException e) {e.printStackTrace();}}private List<String> getEnabledPlugins(List<Instance> instanceList) {Instance instance = instanceList.get(0);Map<String, String> metadata = instance.getMetadata();// plugins: DynamicRoute,AuthString plugins = metadata.getOrDefault("plugins", ShipPluginEnum.DYNAMIC_ROUTE.getName());return Arrays.stream(plugins.split(",")).collect(Collectors.toList());}private List<ServiceInstance> buildServiceInstances(List<Instance> instanceList) {List<ServiceInstance> list = new LinkedList<>();instanceList.forEach(instance -> {Map<String, String> metadata = instance.getMetadata();ServiceInstance serviceInstance = new ServiceInstance();serviceInstance.setAppName(metadata.get("appName"));serviceInstance.setIp(instance.getIp());serviceInstance.setPort(instance.getPort());serviceInstance.setVersion(metadata.get("version"));serviceInstance.setWeight((int) instance.getWeight());list.add(serviceInstance);});return list;}}
}

路由规则数据同步

同时，如果用户在管理后台更新了路由规则，ship-admin需要推送规则数据到ship-server，这里参考了soul网关的做法利用websocket在第一次建立连接后进行全量同步，此后路由规则发生变更就只作增量同步。

服务端WebsocketSyncCacheServer：

* @Author: Ship
* @Description:
* @Date: Created in 2020/12/28
*/
public class WebsocketSyncCacheServer extends WebSocketServer {private final static Logger LOGGER = LoggerFactory.getLogger(WebsocketSyncCacheServer.class);private Gson gson = new GsonBuilder().create();private MessageHandler messageHandler;public WebsocketSyncCacheServer(Integer port) {super(new InetSocketAddress(port));this.messageHandler = new MessageHandler();}@Overridepublic void onOpen(WebSocket webSocket, ClientHandshake clientHandshake) {LOGGER.info("server is open");}@Overridepublic void onClose(WebSocket webSocket, int i, String s, boolean b) {LOGGER.info("websocket server close...");}@Overridepublic void onMessage(WebSocket webSocket, String message) {LOGGER.info("websocket server receive message:\n[{}]", message);this.messageHandler.handler(message);}@Overridepublic void onError(WebSocket webSocket, Exception e) {}@Overridepublic void onStart() {LOGGER.info("websocket server start...");}class MessageHandler {public void handler(String message) {RouteRuleOperationDTO operationDTO = gson.fromJson(message, RouteRuleOperationDTO.class);if (CollectionUtils.isEmpty(operationDTO.getRuleList())) {return;}Map<String, List<AppRuleDTO>> map = operationDTO.getRuleList().stream().collect(Collectors.groupingBy(AppRuleDTO::getAppName));if (OperationTypeEnum.INSERT.getCode().equals(operationDTO.getOperationType())| OperationTypeEnum.UPDATE.getCode().equals(operationDTO.getOperationType())) {RouteRuleCache.add(map);} else if (OperationTypeEnum.DELETE.getCode().equals(operationDTO.getOperationType())) {RouteRuleCache.remove(map);}}}
}

客户端WebsocketSyncCacheClient：

* @Author: Ship
* @Description:
* @Date: Created in 2020/12/28
*/
@Component
public class WebsocketSyncCacheClient {private final static Logger LOGGER = LoggerFactory.getLogger(WebsocketSyncCacheClient.class);private WebSocketClient client;private RuleService ruleService;private Gson gson = new GsonBuilder().create();public WebsocketSyncCacheClient(@Value("${ship.server-web-socket-url}") String serverWebSocketUrl,
RuleService ruleService) {if (StringUtils.isEmpty(serverWebSocketUrl)) {throw new ShipException(ShipExceptionEnum.CONFIG_ERROR);}this.ruleService = ruleService;ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1,new ShipThreadFactory("websocket-connect", true).create());try {client = new WebSocketClient(new URI(serverWebSocketUrl)) {@Overridepublic void onOpen(ServerHandshake serverHandshake) {LOGGER.info("client is open");List<AppRuleDTO> list = ruleService.getEnabledRule();String msg = gson.toJson(new RouteRuleOperationDTO(OperationTypeEnum.INSERT, list));send(msg);}@Overridepublic void onMessage(String s) {}@Overridepublic void onClose(int i, String s, boolean b) {}@Overridepublic void onError(Exception e) {LOGGER.error("websocket client error", e);}};client.connectBlocking();//使用调度线程池进行断线重连，30秒进行一次executor.scheduleAtFixedRate(() -> {if (client != null && client.isClosed()) {try {client.reconnectBlocking();} catch (InterruptedException e) {LOGGER.error("reconnect server fail", e);}}}, 10, 30, TimeUnit.SECONDS);} catch (Exception e) {LOGGER.error("websocket sync cache exception", e);throw new ShipException(e.getMessage());}}public <T> void send(T t) {while (!client.getReadyState().equals(ReadyState.OPEN)) {LOGGER.debug("connecting ...please wait");}client.send(gson.toJson(t));}
}

四、测试

4.1动态路由测试

1、本地启动nacos ,sh startup.sh -m standalone

2、启动ship-admin

3、本地启动两个ship-example实例。

实例1配置：

ship:http:app-name: orderversion: gray_1.0context-path: /orderport: 8081admin-url: 127.0.0.1:9001server:port: 8081nacos:discovery:server-addr: 127.0.0.1:8848

实例2配置：

ship:http:app-name: orderversion: prod_1.0context-path: /orderport: 8082admin-url: 127.0.0.1:9001server:port: 8082nacos:discovery:server-addr: 127.0.0.1:8848

4、在数据库添加路由规则配置，该规则表示当http header 中的name=ship时请求路由到gray_1.0版本的节点。

5、启动ship-server,看到以下日志时则可以进行测试了。

2021-01-02 19:57:09.159  INFO 30413 --- [SocketWorker-29] cn.sp.sync.WebsocketSyncCacheServer      : websocket server receive message:[{"operationType":"INSERT","ruleList":[{"id":1,"appId":5,"appName":"order","version":"gray_1.0","matchObject":"HEADER","matchKey":"name","matchMethod":1,"matchRule":"ship","priority":50}]}]

6、用Postman请求http://localhost:9000/order/user/add,POST方式，header设置name=ship，可以看到只有实例1有日志显示。

==========add user,version:gray_1.0

4.2性能压测

压测环境：

• MacBook Pro 13英寸

• 处理器 2.3 GHz 四核Intel Core i7

• 内存 16 GB 3733 MHz LPDDR4X

• 后端节点个数一个

• 压测工具：wrk

• 压测结果：20个线程，500个连接数，吞吐量大概每秒9400个请求。

五、总结

千里之行始于足下，开始以为写一个网关会很难，但当你实际开始行动时就会发现其实没那么难，所以迈出第一步很重要。过程中也遇到了很多问题，还在github上给soul和nacos这两个开源项目提了两个issue，后来发现是自己的问题，尴尬????。

本文代码已全部上传到 https://github.com/2YSP/ship-gate

来源 | https://www.cnblogs.com/2YSP/p/14223892.html

昨晚逛GitHub，无意中看到一位大佬（https://github.com/halfrost）的算法刷题笔记，感觉发现了宝藏！有些小伙伴可能已经发现了，但咱这里还是忍不住安利一波，怕有些小伙伴没有看到。

关于算法刷题的困惑和疑问也经常听朋友们提及。这份笔记里面共包含作者刷LeetCode算法题后整理的数百道题，每道题均附有详细题解过程。很多人表示刷数据结构和算法题效率不高，甚是痛苦。有了这个笔记的总结，对校招和社招的算法刷题帮助之大不言而喻，果断收藏了。

需要刷题笔记PDF文档的小伙伴可以直接长按扫码关注下方二维码，回复 「刷题笔记」 四个字自取：

关注下方公众号

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笔记版权归原作者所有，转载请注明出处 https://books.halfrost.com/leetcode/