How dynamic routing Spring Cloud Gateway do? Nacos very simple to achieve integration

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I. Description

The core concept is the gateway routing configuration and routing rules, and as the entrance all requests flow in the actual production environment in order to ensure high reliability and availability, is to try to avoid the restart, so the dynamic routing is very necessary; this article introduces the Spring Cloud Gatewayideas to achieve, and to Nacosa data source to explain

PS : About Spring Cloud Zuuldynamic routing See the article " Dynamic Routing Spring Cloud Zuul's how to do it? Integrated Nacos very simple to achieve . "

Second, to achieve points

To implement dynamic routing can focus on the following four points

When the gateway starts, 动态路由how the data is loaded to come
静态路由And 动态路由with that subject, ps: 静态路由it refers to the configuration file-coded routing configuration
Monitor 动态路由the data source changes
What happens when there is a change data 通知gatewayrefresh routing

Third, the specific implementation

Spring Cloud Gateway Load the routing information are responsible for the following categories

PropertiesRouteDefinitionLocator : read the routing information from the configuration file (e.g., YML, Properties, etc.)
RouteDefinitionRepository : read the routing information (such as memory, central configuration, Redis, MySQL, etc.) from the memory
DiscoveryClientRouteDefinitionLocator : reading the routing information from the registry (e.g. Nacos, Eurka, Zookeeper, etc.)

We can customize RouteDefinitionRepositoryto achieve the purpose of dynamic routing implementation class

3.1. Data loading dynamic routing

Create a Nacosthe RouteDefinitionRepositoryimplementation class

NacosRouteDefinitionRepository like to see: NacosRouteDefinitionRepository.java
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Rewriting getRouteDefinitionsmethod of routing information reading

Configuring Nacos listener listens routing configuration changes
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Routing changes only need to ApplicationEventPublisherpush a RefreshRoutesEventevent instantly, gateway will automatically monitor the event and call the getRouteDefinitionsmethod update routing information

3.2. Create a configuration class

DynamicRouteConfig like to see: DynamicRouteConfig.java
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3.3. Adding `Nacos`routing configuration

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New configuration items:

Data Id：scg-routes
Group：SCG_GATEWAY
Configuring 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 routing data

Fourth, the test

Start the gateway through /actuator/gateway/routesto view the current routing information endpoint

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You can see Nacosthe two routes in the configuration information

Complete Spring Cloud Gateway Please see
https://gitee.com/zlt2000/microservices-platform/tree/master/zlt-gateway/sc-gateway

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