动态路由背景
无论你在使用zuul还是spring cloud gateway 的时候，官方文档提供的方案总是基于配置文件配置的方式
例如：
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# zuul 的配置形式routes: pig-auth: path: /auth/** serviceid: pig-auth stripprefix: true# gateway 的配置形式routes:- id: pigx-auth uri: lb://pigx-auth predicates: - path=/auth/** filters: - validatecodegatewayfilter |
配置更改需要重启服务，不能满足实际生产过程中的动态刷新、实时变更的业务需求。
基于以上分析 pig已经提供了基于zuul版本的动态路由功能，附git 地址传送门,效果如下图可以实时配置修改刷新。
spring cloud gateway 路由加载源码
- dispatcherhandler 接管用户请求
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routepredicatehandlermapping 路由匹配
- 根据routelocator获取 routedefinitionlocator
- 返回多个routedefinitionlocator.getroutedefinitions()的路由定义信息
- filteringwebhandler执行路由定义中的filter 最后路由到具体的业务服务中
spring cloud gateway 默认动态路由实现
gatewaycontrollerendpoint 基于actuate端点的默认实现，支持jvm 级别的动态路由，不能序列化存储
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// 上图动态路由的信息保存的默认实现是基于内存的实现public class inmemoryroutedefinitionrepository implements routedefinitionrepository { private final map<string, routedefinition> routes = synchronizedmap(new linkedhashmap<string, routedefinition>()); @override public mono<void> save(mono<routedefinition> route){} @override public mono<void> delete(mono<string> routeid){} @override public flux<routedefinition> getroutedefinitions(){}} |
扩展基于mysql + redis存储分布式动态组件
为什么使用mysql的同时，又要使用redis？
- spring cloud gateway 基于webflux 背压，暂时不支持mysql 数据库
- redis-reactive 支持 spring cloudgateway 的背压，同时还可以实现分布式，高性能
扩展思路
- 增加一个路由管理模块，参考gatewaycontrollerendpoint实现，启动时加载数据库中配置文件到redis
- 网关模块重写routedefinitionrepository，getroutedefinitions（）取redis中读取即可实现
- 前端配合 json-view 类似插件，直接修改展示。
具体实现
路由管理模块核心处理逻辑，获取路由和更新路由
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/** * @author lengleng * @date 2018年11月06日10:27:55 * <p> * 动态路由处理类 */@slf4j@allargsconstructor@service("sysrouteconfservice")public class sysrouteconfserviceimpl extends serviceimpl<sysrouteconfmapper, sysrouteconf> implements sysrouteconfservice { private final redistemplate redistemplate; private final applicationeventpublisher applicationeventpublisher; /** * 获取全部路由 * <p> * redisroutedefinitionwriter.java * propertiesroutedefinitionlocator.java * * @return */ @override public list<sysrouteconf> routes() { sysrouteconf condition = new sysrouteconf(); condition.setdelflag(commonconstant.status_normal); return basemapper.selectlist(new entitywrapper<>(condition)); } /** * 更新路由信息 * * @param routes 路由信息 * @return */ @override public mono<void> editroutes(jsonarray routes) { // 清空redis 缓存 boolean result = redistemplate.delete(commonconstant.route_key); log.info("清空网关路由 {} ", result); // 遍历修改的routes，保存到redis list<routedefinitionvo> routedefinitionvolist = new arraylist<>(); routes.foreach(value -> { log.info("更新路由 ->{}", value); routedefinitionvo vo = new routedefinitionvo(); map<string, object> map = (map) value; object id = map.get("routeid"); if (id != null) { vo.setid(string.valueof(id)); } object predicates = map.get("predicates"); if (predicates != null) { jsonarray predicatesarray = (jsonarray) predicates; list<predicatedefinition> predicatedefinitionlist = predicatesarray.tolist(predicatedefinition.class); vo.setpredicates(predicatedefinitionlist); } object filters = map.get("filters"); if (filters != null) { jsonarray filtersarray = (jsonarray) filters; list<filterdefinition> filterdefinitionlist = filtersarray.tolist(filterdefinition.class); vo.setfilters(filterdefinitionlist); } object uri = map.get("uri"); if (uri != null) { vo.seturi(uri.create(string.valueof(uri))); } object order = map.get("order"); if (order != null) { vo.setorder(integer.parseint(string.valueof(order))); } redistemplate.sethashvalueserializer(new jackson2jsonredisserializer<>(routedefinitionvo.class)); redistemplate.opsforhash().put(commonconstant.route_key, vo.getid(), vo); routedefinitionvolist.add(vo); }); // 逻辑删除全部 sysrouteconf condition = new sysrouteconf(); condition.setdelflag(commonconstant.status_normal); this.delete(new entitywrapper<>(condition)); //插入生效路由 list<sysrouteconf> routeconflist = routedefinitionvolist.stream().map(vo -> { sysrouteconf routeconf = new sysrouteconf(); routeconf.setrouteid(vo.getid()); routeconf.setfilters(jsonutil.tojsonstr(vo.getfilters())); routeconf.setpredicates(jsonutil.tojsonstr(vo.getpredicates())); routeconf.setorder(vo.getorder()); routeconf.seturi(vo.geturi().tostring()); return routeconf; }).collect(collectors.tolist()); this.insertbatch(routeconflist); log.debug("更新网关路由结束 "); this.applicationeventpublisher.publishevent(new refreshroutesevent(this)); return mono.empty(); }} |
网关自定义redisroutedefinitionrepository
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@slf4j@component@allargsconstructorpublic class redisroutedefinitionwriter implements routedefinitionrepository { private final redistemplate redistemplate; @override public mono<void> save(mono<routedefinition> route) { return route.flatmap(r -> { routedefinitionvo vo = new routedefinitionvo(); beanutils.copyproperties(r, vo); log.info("保存路由信息{}", vo); redistemplate.opsforhash().put(commonconstant.route_key, r.getid(), vo); return mono.empty(); }); } @override public mono<void> delete(mono<string> routeid) { routeid.subscribe(id -> { log.info("删除路由信息{}", id); redistemplate.opsforhash().delete(commonconstant.route_key, id); }); return mono.empty(); } @override public flux<routedefinition> getroutedefinitions() { redistemplate.sethashvalueserializer(new jackson2jsonredisserializer<>(routedefinitionvo.class)); list<routedefinitionvo> values = redistemplate.opsforhash().values(commonconstant.route_key); list<routedefinition> definitionlist = new arraylist<>(); values.foreach(vo -> { routedefinition routedefinition = new routedefinition(); beanutils.copyproperties(vo, routedefinition); definitionlist.add(vo); }); log.debug("redis 中路由定义条数： {}， {}", definitionlist.size(), definitionlist); return flux.fromiterable(definitionlist); }} |
3.库表定义
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000016967513
