17、GateWay和Sentinel继承实现服务限流

注：本篇文章主要参考周阳老师讲解的cloud进行整理的！

1、需求说明

cloudalibaba-sentinel-gateway9528 保护 cloudalibaba-provider-payment9001

2、启动nacos服务器8848

startup.cmd -m standalone

3、启动sentinel服务器8080

java -jar sentinel-dashboard-1.8.6.jar

4、步骤

4.1、建Modul

在这里插入图片描述

4.2、改POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.mui.cloud</groupId><artifactId>cloud2024</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>cloudalibaba-sentinel-gateway9528</artifactId><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-gateway</artifactId></dependency><dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-transport-simple-http</artifactId><version>1.8.6</version></dependency><dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-spring-cloud-gateway-adapter</artifactId><version>1.8.6</version></dependency><dependency><groupId>javax.annotation</groupId><artifactId>javax.annotation-api</artifactId><version>1.3.2</version><scope>compile</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

4.3、写YML

server:port: 9528spring:application:name: cloudalibaba-sentinel-gateway     # sentinel+gataway整合Casecloud:nacos:discovery:server-addr: localhost:8848gateway:routes:- id: pay_routh1 #pay_routh1                #路由的ID(类似mysql主键ID)，没有固定规则但要求唯一，建议配合服务名uri: http://localhost:9001                #匹配后提供服务的路由地址predicates:- Path=/pay/**                      # 断言，路径相匹配的进行路由

4.4、主启动

package com.dashun.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication
@EnableDiscoveryClient
public class Main9528 {public static void main(String[] args) {SpringApplication.run(Main9528.class, args);}
}

4.5、业务类

4.5.1、参考官网配置说明案例改写

在这里插入图片描述

https://github.com/alibaba/Sentinel/wiki/%E7%BD%91%E5%85%B3%E9%99%90%E6%B5%81

https://sentinelguard.io/zh-cn/docs/api-gateway-flow-control.html

4.5.2、配置config

package com.mui.cloud.config;import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule;
import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayRuleManager;
import com.alibaba.csp.sentinel.adapter.gateway.sc.SentinelGatewayFilter;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import com.alibaba.csp.sentinel.adapter.gateway.sc.exception.SentinelGatewayBlockExceptionHandler;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.reactive.result.view.ViewResolver;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;import javax.annotation.PostConstruct;
import java.util.*;@Configuration
public class GatewayConfiguration {private final List<ViewResolver> viewResolvers;private final ServerCodecConfigurer serverCodecConfigurer;public GatewayConfiguration(ObjectProvider<List<ViewResolver>> viewResolversProvider, ServerCodecConfigurer serverCodecConfigurer) {this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);this.serverCodecConfigurer = serverCodecConfigurer;}@Bean@Order(Ordered.HIGHEST_PRECEDENCE)public SentinelGatewayBlockExceptionHandler sentinelGatewayBlockExceptionHandler() {// Register the block exception handler for Spring Cloud Gateway.return new SentinelGatewayBlockExceptionHandler(viewResolvers, serverCodecConfigurer);}@Bean@Order(-1)public GlobalFilter sentinelGatewayFilter() {return new SentinelGatewayFilter();}@PostConstruct //javax.annotation.PostConstructpublic void doInit() {initBlockHandler();}//处理/自定义返回的例外信息private void initBlockHandler() {Set<GatewayFlowRule> rules = new HashSet<>();rules.add(new GatewayFlowRule("pay_routh1").setCount(2).setIntervalSec(1));GatewayRuleManager.loadRules(rules);BlockRequestHandler handler = new BlockRequestHandler() {@Overridepublic Mono<ServerResponse> handleRequest(ServerWebExchange exchange, Throwable t) {Map<String, String> map = new HashMap<>();map.put("errorCode", HttpStatus.TOO_MANY_REQUESTS.getReasonPhrase());map.put("errorMessage", "请求太过频繁，系统忙不过来，触发限流(sentinel+gataway整合Case)");return ServerResponse.status(HttpStatus.TOO_MANY_REQUESTS).contentType(MediaType.APPLICATION_JSON).body(BodyInserters.fromValue(map));}};GatewayCallbackManager.setBlockHandler(handler);}}