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This article will explain in detail about Spring Cloud Gateway dynamic routing and integration Nacos implementation example analysis, the quality of the article content is high, so Xiaobian share for everyone to make a reference, I hope you have a certain understanding of related knowledge after reading this article.

I. Description

The core concept of gateway is routing configuration and routing rules, and as the entrance of all request traffic, in order to ensure high reliability and high availability in the actual production environment, it is necessary to avoid restarting as much as possible, so it is very necessary to implement dynamic routing. The following mainly introduces the idea of Spring Cloud Gateway implementation, and uses Nacos as the data source to explain

II. Key points for realization

To implement dynamic routing, just pay attention to the following four points

How to load dynamic routing data when gateway starts

static routing and dynamic routing which prevail, ps: static routing refers to the configuration file written dead route configuration

Monitor dynamic routing for data source changes

How to notify gateway to refresh route when data changes

III. Concrete realization

The following classes are responsible for loading routing information in Spring Cloud Gateway

PropertiesRouteDefinitionLocator: reads routing information (such as YML, Properties, etc.) from configuration files

RouteDefinitionRepository: reads routing information from memory (such as memory, configuration center, Redis, MySQL, etc.)

DiscoveryClientRouteDefinitionLocator: reads routing information from the registry (such as Nacos, Eurka, Zookeeper, etc.)

We can achieve the purpose of dynamic routing by customizing the implementation class of RouteDefinitionRepository

3.1. Data Loading for Dynamic Routing

Create a RouteDefinitionRepository implementation class for Nacos

NacosRouteDefinitionRepository

Overwrite the getRouteDefinitions method to read routing information

Configure the Nacos listener to listen for changes in routing configuration information

Route changes simply require pushing a Refresh RoutesEvent event to ApplicationEventPublisher, and the gateway will automatically listen for the event and call the getRouteDefinitions method to update the route information

3.2. Creating Configuration Classes

DynamicRouteConfig

3.3. Add Nacos routing configuration

New Configuration Item:

Data Id：scg-routes

Group：SCG_GATEWAY

Configuration content:

[ { "id": "csdn", "predicates": [{ "name": "Path", "args": { "pattern": "/csdn/** " } }], "uri": "https://www.csdn.net/", "filters": [] }, { "id": "github", "predicates": [{ "name": "Path", "args": { "pattern": "/github/** " } }], "uri": "http://github.com/", "filters": [] }]

Add two route data

IV. Testing

Start gateway View current route information via/actuator/gateway/routes endpoint

You can see two routes configured in Nacos.

About Spring Cloud Gateway dynamic routing and integration Nacos implementation sample analysis shared here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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