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class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->1.0.2</span><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>网关 Gateway 架构</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="gateway-架构设计"></a>Gateway 架构设计<a class="hash-link" href="#gateway-架构设计" title="Direct link to heading">#</a></h2><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="简述"></a>简述<a class="hash-link" href="#简述" title="Direct link to heading">#</a></h4><p>Gateway网关是Linkis接受客户端以及外部请求的首要入口，例如接收作业执行请求，而后将执行请求转发到具体的符合条件的Entrance服务中去。 |
| 整个架构底层基于SpringCloudGateway做扩展实现，上层叠加了与Http请求解析，会话权限，标签路由和WebSocket多路转发等相关的模组设计，整体架构可见如下。</p><h3><a aria-hidden="true" tabindex="-1" class="anchor anchor__h3 anchorWithStickyNavbar_y2LR" id="整体架构示意图"></a>整体架构示意图<a class="hash-link" href="#整体架构示意图" title="Direct link to heading">#</a></h3><p><img alt="Gateway整体架构示意图" src="/zh-CN/assets/images/gateway_server_global-539468b0405575fe0f839e1123363f57.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="架构说明"></a>架构说明<a class="hash-link" href="#架构说明" title="Direct link to heading">#</a></h4><ul><li>gateway-core: Gateway的核心接口定义模块，主要定义了GatewayParser和GatewayRouter接口，分别对应请求的解析和根据请求进行路由选择；同时还提供了SecurityFilter的权限校验工具类。</li><li>spring-cloud-gateway: 该模块集成了所有与SpringCloudGateway相关的依赖，对HTTP和WebSocket两种协议类型的请求分别进行了处理转发。</li><li>gateway-server-support: Gateway的服务驱动模块，依赖spring-cloud-gateway模块，对GatewayParser、GatewayRouter分别做了实现，其中DefaultLabelGatewayRouter提供了请求标签路由的功能。</li><li>gateway-httpclient-support: 提供了Http访问Gateway服务的客户端通用类。</li><li>instance-label: 外联的实例标签模块，提供InsLabelService服务接口，用于路由标签的创建以及与应用实例关联。</li></ul><p>涉及的详细设计如下：</p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="一请求路由转发带标签信息"></a>一、请求路由转发（带标签信息）<a class="hash-link" href="#一请求路由转发带标签信息" title="Direct link to heading">#</a></h4><p>请求的链路首先经SpringCloudGateway的Dispatcher分发后，进入网关的过滤器链表，进入GatewayAuthorizationFilter 和 SpringCloudGatewayWebsocketFilter 两大过滤器逻辑，过滤器集成了DefaultGatewayParser和DefaultGatewayRouter。 |
| 从Parser到Router，执行相应的parse和route方法，DefaultGatewayParser和DefaultGatewayRouter内部还包含了自定义的Parser和Router，按照优先级顺序执行。最后由DefaultGatewayRouter输出路由选中的服务实例ServiceInstance，交由上层进行转发。 |
| 现我们以具有标签信息的作业执行请求转发为例子，绘制如下流程图：<br> |
| <img alt="Gateway请求路由转发" src="/zh-CN/assets/images/gateway_server_dispatcher-ce66a27f48471f0994f7feeb32905040.png"></p><h4><a aria-hidden="true" tabindex="-1" class="anchor anchor__h4 anchorWithStickyNavbar_y2LR" id="二websocket连接转发管理"></a>二、WebSocket连接转发管理<a class="hash-link" href="#二websocket连接转发管理" title="Direct link to heading">#</a></h4><p>默认情况下SpringCloudGateway对WebSocket请求只做一次路由转发，无法做动态的切换，而在Linkis Gateway架构下，每次信息的交互都会附带相应的uri地址，引导路由到不同的后端服务。 |
| 除了负责与前端、客户端连接的webSocketService以及负责和后台服务连接的webSocketClient, 中间会缓存一系列GatewayWebSocketSessionConnection列表，一个GatewayWebSocketSessionConnection代表一个session会话与多个后台ServiceInstance的连接。<br> |
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| <p style="font-family: Avenir-Medium;font-size: 14px;color: #999;line-height: 20px;">Apache Linkis (incubating) is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.</p> |
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