API网关关键技术

原創

2021-05-16 11:43

表名

表描述

v2_api_user

API开发者用户

v2_api_user_role

开发者和角色关系表，系统自动维护。

v2_api_role

API角色表，和企业工单绑定。

v2_api_role_perms

API角色和权限信息关系表，系统自动维护。

v2_api_perms

API权限表，和每一个API绑定。

"}}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"四、Zuul动态网关路由","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Zuul 是Netflix 提供的一个开源组件,致力于在云平台上提供动态路由，监控，弹性，安全等边缘服务的框架。使用它来作为网关的重要组成部分，集动态路由，动态权限，限流配额等功能为一体，为其他部门的项目提供统一的外网调用管理，最终形成API网关产品。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"color","attrs":{"color":"#4F4F4F","name":"user"}}],"text":"Zuul 架构图：","attrs":{}}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/2b/2bf8b4b62c505f3ec4c68bfb8d9e539b.png","alt":null,"title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在zuul中，整个请求的过程是这样的，首先将请求给zuulservlet处理，zuulservlet中有一个zuulRunner对象，该对象中初始化了RequestContext：作为存储整个请求的一些数据，并被所有的zuulfilter共享。zuulRunner中还有 FilterProcessor，FilterProcessor作为执行所有的zuulfilter的管理器。FilterProcessor从filterloader 中获取zuulfilter，而zuulfilter是被filterFileManager所加载，并支持groovy热加载，采用了轮询的方式热加载。有了这些filter之后，zuulservelet首先执行的Pre类型的过滤器，再执行route类型的过滤器，最后执行的是post 类型的过滤器，如果在执行这些过滤器有错误的时候则会执行error类型的过滤器。执行完这些过滤器，最终将请求的结果返回给客户端。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Zuul默认路由经过路径（ ZuulController -> ZuulServlet (preRoute() route() postRoute())-> (ZuulFilter(SimpleHostRoutingFilter真正转发请求)) ）。如果要实现动态路由，需覆写zuul默认实现的SimpleRouteLocator类的locateRoutes方法，路由信息从DB中获取，并继承实现自动的接口类RefreshableRouteLocator类的refresh方法。具体如下：","attrs":{}}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/8a/8aee79899945cb9a868c9543d225d4c7.png","alt":null,"title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"CustomRouteLocator（路由定位器类）：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"覆写父类的locateRoutes方法，实现从DB动态获取路由信息。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"覆写refresh方法，实现刷新动态路由信息。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"CustomZuulConfig（路由配置类）：注入自定义的路由定位器。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}