Java’s SpringCloud Alibaba [8] [Spring Cloud microservice Gateway integrates sentinel current limiting]

Java’s SpringCloud Alibaba [1] [Nacos One Article Mastery Series]	Jump
Java’s SpringCloud Alibaba [2] [Microservice calling component Feign]	Jump
Java’s SpringCloud Alibaba [3 】[Microservice Nacos-config Configuration Center]	Jump
Java’s SpringCloud Alibaba [Four] [Microservice Sentinel Service Meltdown]	Jump
Java’s SpringCloud Alibaba [5] [Microservice Sentinel integrates openfeign for downgrade]	Jump
Java’s SpringCloud Alibaba [6] [Alibaba microservice distributed transaction component-Seata]	Jump
SpringCloud Alibaba in Java [Seven] [Spring Cloud Microservice Gateway Gateway Component]	Jump
SpringCloud Alibaba in Java [Eight] [Spring Cloud Microservice Service Gateway integrates sentinel current limiting]	Jump
Java’s SpringCloud Alibaba [9] [Spring Cloud Microservice Skywalking]	Jump

Java’s SpringCloud Alibaba [8] [Spring Cloud microservice Gateway integrated sentinel current limiting]

- 1. Gateway integrates sentinel current limiting
- - 1. Add dependencies
  - 2. Add configuration
  - 3. Improve the test interface
- 2. Implement current limiting through code
- - 1. Write configuration class
- 3. Implementation through configuration files
- 4. High availability of network management

1. Gateway integrates sentinel current limiting

As a barrier outside the internal system, the gateway plays a certain protective role internally, and current limiting is one of them. The current limiting at the gateway layer can simply limit the current for different routes, or it can also target the business interface. Perform current limiting, or group current limiting based on the characteristics of the interface.

1. Add dependencies

<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

2. Add configuration

server:
  port: 8088
spring:
  application:
    name: api-gateway
# gateway configuration
  cloud:
    gateway:
      routes:
        - id: order_route #The unique identifier of the route, route to order
          uri: lb://order-service # The address that needs to be forwarded lb refers to obtaining the microservice by name from nacos and following the load balancing policy order-service service name
          #Assertion rules are used for matching routing rules
          predicates:
            - Path=/order/**
              # http://localhost:8088/order-serve/order/add routes to ↓
              # http://localhost:8020/order-serve/order/add
            #- After=2020-10-19T09:07:00.660 + 08:00[Asia/Shanghai]
            #- Header=X-Request-Id, \d +
            #- Method=GET
            #- Query=name,xushu|zhuge
            #- CheckAuth = xushu
          #filters:
            #- AddRequestHeader=X-Request-color,red
            #- AddRequestParameter=color,blue
            #- PrefixPath=/mall-order #To add a prefix corresponding to the microservice, you need to configure context-path
            #- StripPrefix=1 # Before forwarding, remove the first path
            # http://localhost:8020/order/add
            #- RedirectTo=302, https://www.baidu.com
            #-SetStatus= 404
            #- CheckAuth=xushu
        #- id: stock_route
    # Configure Nacos
      # Cross-domain configuration
 #globalcors:
 # cors-configurations:
 # '[/**]': # Allow cross-domain access resources
 # allowedOrigins: "*" #Cross-domain allowed origins For example: www.smsm.com
 # allowedMethods:
 #-GET
 # - POST
 #-PUT

    #Configure Nacos
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        username: nacos
        password: nacos
    # Configure sentinel
    sentinel:
      transport:
        dashboard: 127.0.0.1:8858

3. Improve the test interface

Download: sentinel-dashboard-1.8.0.jar

https://github.com/alibaba/Sentinel/releases

Run jar package

java -Dserver.port=8858 -Dsentinel.dashboard.auth.username=xushu -Dsentinel.dashboard.auth.password=123456 -jar C:\Users\ZHENG\Desktop\sentinel-dashboard-1.8 .0.jar

Visit: http://localhost:8858/

Account: xushu
Password: 123456

http://127.0.0.1:8088/order/add

Visit: http://127.0.0.1:8088/order/add

Keep clicking for continuous visits

2. Implement current limiting through code

1. Write configuration class

@Configuration
public class GatewayConfig {<!-- -->
    @PostConstruct //When setting initialization
    public void init(){<!-- -->
        BlockRequestHandler blockRequestHandler = new BlockRequestHandler() {<!-- -->
            @Override
            public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange, Throwable t) {<!-- -->
                System.out.println(t);
                HashMap<String,String> map = new HashMap<String,String>();
                map.put("code",HttpStatus.TOO_MANY_REQUESTS.toString());
                map.put("message","current limit");
                //Customized exception handling
                return ServerResponse.status(HttpStatus.OK)
                        .contentType(MediaType.APPLICATION_JSON)
                        .body(BodyInserters.fromValue(map))
                        ;
            }
        };
        GatewayCallbackManager.setBlockHandler(blockRequestHandler);
    }
}

Visit: http://127.0.0.1:8088/order/get

Visit: http://127.0.0.1:8088/order/get

continuous access

3. Implementation through configuration files

 scg:
        fallback:
          mode: response
          response-body: "{code:'',messageL:''}"

4. Network management high availability

In order to ensure the high availability of the Gateway, multiple Gateway instances can be started at the same time for load. Nginx or F5 is used upstream of the Gateway for load forwarding to achieve high availability.

Java’s SpringCloud Alibaba [1] [Nacos One Article Mastery Series]	Jump
Java’s SpringCloud Alibaba [2] [Microservice calling component Feign]	Jump
Java’s SpringCloud Alibaba [3 】[Microservice Nacos-config Configuration Center]	Jump
Java’s SpringCloud Alibaba [Four] [Microservice Sentinel Service Meltdown]	Jump
Java’s SpringCloud Alibaba [5] [Microservice Sentinel integrates openfeign for downgrade]	Jump
Java’s SpringCloud Alibaba [6] [Alibaba microservice distributed transaction component-Seata]	Jump
SpringCloud Alibaba in Java [Seven] [Spring Cloud Microservice Gateway Gateway Component]	Jump
SpringCloud Alibaba in Java [Eight] [Spring Cloud Microservice Service Gateway integrates sentinel current limiting]	Jump
Java’s SpringCloud Alibaba [9] [Spring Cloud Microservice Skywalking]	Jump