動態路由背景
? 無論你在使用zuul還是spring cloud gateway 的時候，官方文檔提供的方案總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 |
配置更改需要重啟服務，不能滿足實際生產過程中的動態刷新、實時變更的業務需求。
? 基于以上分析 pig已經提供了基于zuul版本的動態路由功能，附git 地址傳送門,效果如下圖可以實時配置修改刷新。
spring cloud gateway 路由加載源碼
- dispatcherhandler 接管用戶請求
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routepredicatehandlermapping 路由匹配
- 根據routelocator獲取 routedefinitionlocator
- 返回多個routedefinitionlocator.getroutedefinitions()的路由定義信息
- filteringwebhandler執行路由定義中的filter 最后路由到具體的業務服務中
spring cloud gateway 默認動態路由實現
gatewaycontrollerendpoint 基于actuate端點的默認實現，支持jvm 級別的動態路由，不能序列化存儲
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// 上圖動態路由的信息保存的默認實現是基于內存的實現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(){}} |
擴展基于mysql + redis存儲分布式動態組件
為什么使用mysql的同時，又要使用redis？
- spring cloud gateway 基于webflux 背壓，暫時不支持mysql 數據庫
- redis-reactive 支持 spring cloudgateway 的背壓，同時還可以實現分布式，高性能
擴展思路
- 增加一個路由管理模塊，參考gatewaycontrollerendpoint實現，啟動時加載數據庫中配置文件到redis
- 網關模塊重寫routedefinitionrepository，getroutedefinitions（）取redis中讀取即可實現
- 前端配合 json-view 類似插件，直接修改展示。
具體實現
路由管理模塊核心處理邏輯，獲取路由和更新路由
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/** * @author lengleng * @date 2018年11月06日10:27:55 * <p> * 動態路由處理類 */@slf4j@allargsconstructor@service("sysrouteconfservice")public class sysrouteconfserviceimpl extends serviceimpl<sysrouteconfmapper, sysrouteconf> implements sysrouteconfservice { private final redistemplate redistemplate; private final applicationeventpublisher applicationeventpublisher; /** * 獲取全部路由 * <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 緩存 boolean result = redistemplate.delete(commonconstant.route_key); log.info("清空網關路由 {} ", result); // 遍歷修改的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); }); // 邏輯刪除全部 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("更新網關路由結束 "); this.applicationeventpublisher.publishevent(new refreshroutesevent(this)); return mono.empty(); }} |
網關自定義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("刪除路由信息{}", 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 中路由定義條數： {}， {}", definitionlist.size(), definitionlist); return flux.fromiterable(definitionlist); }} |
3.庫表定義
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://segmentfault.com/a/1190000016967513
