分組限流

實際開發中我們往往是分組限流
我們先為provider類編寫幾個分組介面

    @GetMapping("/api1/demo1")
    public String demo1(){
        return "api1-demo1";
    }

    @GetMapping("/api1/demo2")
    public String demo2(){
        return "api1-demo2";
    }

    @GetMapping("/api2/demo1")
    public String demo3(){
        return "api2-demo1";
    }

    @GetMapping("/api2/demo2")
    public String demo4(){
        return "api2-demo2";
    }
 

編寫配置類

為gateway模組編寫配置類 處理分組限流配置

package com.jie.config;

import com.alibaba.csp.sentinel.adapter.gateway.common.SentinelGatewayConstants;
import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiDefinition;
import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPathPredicateItem;
import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPredicateItem;
import com.alibaba.csp.sentinel.adapter.gateway.common.api.GatewayApiDefinitionManager;
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;
    }

    //配置限流的異常處理
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public SentinelGatewayBlockExceptionHandler sentinelGatewayBlockExceptionHandler() {
        return new SentinelGatewayBlockExceptionHandler(viewResolvers, serverCodecConfigurer);
    }

    //配置初始化的限流引數
    @PostConstruct
    public void initGatewayRules(){
        Set<GatewayFlowRule> rules = new HashSet<>();
        //為分組進行限流 一秒一次 這裡名字是自定義的 與下面對映
        rules.add(new GatewayFlowRule("provider_api1").setCount(1).setIntervalSec(1));
        rules.add(new GatewayFlowRule("provider_api2").setCount(1).setIntervalSec(1));
        GatewayRuleManager.loadRules(rules);
    }

    //初始化限流過濾器
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public GlobalFilter sentinelGatewayFilter() {
        return new SentinelGatewayFilter();
    }

    //自定義限流異常頁面
    @PostConstruct
    public void initBlockHandlers(){
        BlockRequestHandler blockRequestHandler = new BlockRequestHandler() {
            @Override
            public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange, Throwable throwable) {
                Map map = new HashMap();
                map.put("code",0);
                map.put("msg","被限流了");
                return ServerResponse.status(HttpStatus.OK)
                        .contentType(MediaType.APPLICATION_JSON)
                        .body(BodyInserters.fromValue(map));
            }
        };
        GatewayCallbackManager.setBlockHandler(blockRequestHandler);
    }

    //自定義API分組
    @PostConstruct
    private void initCustomizedApis(){
        Set<ApiDefinition> definitions = new HashSet<>();
        //為上面自定義組名字匹配是對映哪些請求
        ApiDefinition api1 = new ApiDefinition("provider_api1")
                .setPredicateItems(new HashSet<ApiPredicateItem>(){{
                    add(new ApiPathPredicateItem().setPattern("/provider/api1/**")
                            .setMatchStrategy(SentinelGatewayConstants.URL_MATCH_STRATEGY_PREFIX));
                }});
        ApiDefinition api2 = new ApiDefinition("provider_api2")
                .setPredicateItems(new HashSet<ApiPredicateItem>(){{
                    add(new ApiPathPredicateItem().setPattern("/provider/api2/demo1"));
                }});
        definitions.add(api1);
        definitions.add(api2);
        GatewayApiDefinitionManager.loadApiDefinitions(definitions);
    }
}

 

這裡我們對Api1這組全部介面都限流了
測試訪問:
如果超過一秒一次就會被限制

但是這裡要注意限流的是閘道器請求 如果你直接訪問提供訪問的埠是不會被限制的

由於我們設定api2只有demo1介面被限制 所以我們可以無限次通過閘道器訪問/ap2/demo2這個介面