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class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Linkis<!-- --> <b>1.2.0</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/latest/about/introduction">latest version</a></b> (<!-- -->1.5.0<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Architecture</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Microservice Governance Services</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Gateway Design</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.2.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Gateway Design</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="gateway-architecture-design">Gateway Architecture Design<a class="hash-link" href="#gateway-architecture-design" title="Direct link to heading"></a></h2><h4 class="anchor anchorWithStickyNavbar_LWe7" id="brief">Brief<a class="hash-link" href="#brief" title="Direct link to heading"></a></h4><p>The Gateway is the primary entry point for Linkis to accept client and external requests, such as receiving job execution requests, and then forwarding the execution requests to specific eligible Entrance services. |
| The bottom layer of the entire architecture is implemented based on "SpringCloudGateway". The upper layer is superimposed with module designs related to Http request parsing, session permissions, label routing and WebSocket multiplex forwarding. The overall architecture can be seen as follows.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="architecture-diagram">Architecture Diagram<a class="hash-link" href="#architecture-diagram" title="Direct link to heading"></a></h3><p><img loading="lazy" alt="Gateway diagram of overall architecture" src="/assets/images/gateway_server_global-539468b0405575fe0f839e1123363f57.png" width="1397" height="839" class="img_ev3q"></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="architecture-introduction">Architecture Introduction<a class="hash-link" href="#architecture-introduction" title="Direct link to heading"></a></h4><ul><li>gateway-core: Gateway's core interface definition module, mainly defines the "GatewayParser" and "GatewayRouter" interfaces, corresponding to request parsing and routing according to the request; at the same time, it also provides the permission verification tool class named "SecurityFilter".</li><li>spring-cloud-gateway: This module integrates all dependencies related to "SpringCloudGateway", process and forward requests of the HTTP and WebSocket protocol types respectively.</li><li>gateway-server-support: The driver module of Gateway, relies on the spring-cloud-gateway module to implement "GatewayParser" and "GatewayRouter" respectively, among which "DefaultLabelGatewayRouter" provides the function of label routing.</li><li>gateway-httpclient-support: Provides a client-side generic class for Http to access Gateway services, which can be implemented based on more.</li><li>instance-label: External instance label module, providing service interface named "InsLabelService" which used to create routing labels and associate with application instances.</li></ul><p>The detailed design involved is as follows：</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="1request-routing-and-forwarding-with-label-information">1、Request Routing And Forwarding (With Label Information)<a class="hash-link" href="#1request-routing-and-forwarding-with-label-information" title="Direct link to heading"></a></h4><p>First, after the dispatcher of "SpringCloudGateway", the request enters the filter list of the gateway, and then enters the two main logic of "GatewayAuthorizationFilter" and "SpringCloudGatewayWebsocketFilter". |
| The filter integrates "DefaultGatewayParser" and "DefaultGatewayRouter" classes. From Parser to Router, execute the corresponding parse and route methods. |
| "DefaultGatewayParser" and "DefaultGatewayRouter" classes also contain custom Parser and Router, which are executed in the order of priority. |
| Finally, the service instance selected by the "DefaultGatewayRouter" is handed over to the upper layer for forwarding. |
| Now, we take the job execution request forwarding with label information as an example, and draw the following flowchart:<br> |
| <img loading="lazy" alt="Gateway Request Routing" src="/assets/images/gateway_server_dispatcher-c8f5c036dd305580aef3fe531672a1f9.png" width="2767" height="1650" class="img_ev3q"></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="2websocket-connection-forwarding-management">2、WebSocket Connection Forwarding Management<a class="hash-link" href="#2websocket-connection-forwarding-management" title="Direct link to heading"></a></h4><p>By default, "Spring Cloud Gateway" only routes and forwards WebSocket request once, and cannot perform dynamic switching. |
| But under the Linkis's gateway architecture, each information interaction will be accompanied by a corresponding uri address to guide routing to different backend services. |
| In addition to the "WebSocketService" which is responsible for connecting with the front-end and the client, |
| and the "WebSocketClient" which is responsible for connecting with the backend service, a series of "GatewayWebSocketSessionConnection" lists are cached in the middle. |
| A "GatewayWebSocketSessionConnection" represents the connection between a session and multiple backend service instances.<br> |
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