java -Dserver.port=7777 -Dcsp.sentinel.dashboard.server=localhost:77
77 -Dproject.name=zhangkechen-sentinel-dashboard -jar sentinel-dashboard-1.8.6.jar

2.3、访问sentinel

地址：http://localhost:7777/

3、 SpringCloud Alibaba Sentinel 控制台有哪些能力

二、项目中使用sentinel的限流功能

1、添加依赖

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

2、yml配置(spring:cloud下)

    sentinel:
      # 配置 sentinel dashboard 地址
      transport:
        dashboard: 127.0.0.1:7777
        port: 8719 # 会在应用对应的机器上启动一个 Http Server, 该 Server 会与 Sentinel 控制台做交互
      # 服务启动直接建立心跳连接
      eager: true
      datasource:

3、编写限流controller接口

/**
 * <h1>基于 Sentinel 控制台配置流控规则</h1>
 * Sentinel 是懒加载的, 先去访问一下, 就可以在 Sentinel Dashboard 看到了
 * */
@Slf4j
@RestController
@RequestMapping("/dashboard")
public class RateLimitController {

    /**
     * <h2>在 dashboard 中 "流控规则" 中按照资源名称新增流控规则</h2>
     * */
    @GetMapping("/by-resource")
    @SentinelResource(
            value = "byResource",
            blockHandler = "qinyiHandleBlockException",
            blockHandlerClass = QinyiBlockHandler.class
    )
    public CommonResponse<String> byResource() {
        log.info("coming in rate limit controller by resource");
        return new CommonResponse<>(0, "", "byResource");
    }

    /**
     * <h2>在 "簇点链路" 中给 url 添加流控规则</h2>
     * */
    @GetMapping("/by-url")
    @SentinelResource(value = "byUrl")
    public CommonResponse<String> byUrl() {
        log.info("coming in rate limit controller by url");
        return new CommonResponse<>(0, "", "byUrl");
    }
}

4、编写自定义通用的限流处理逻辑

/**
 * <h1>自定义通用的限流处理逻辑</h1>
 * */
@Slf4j
public class QinyiBlockHandler {

    /**
     * <h2>通用限流处理方法</h2>
     * 这个方法必须是 static 的
     * */
    public static CommonResponse<String> qinyiHandleBlockException(BlockException exception) {

        log.error("trigger qinyi block handler: [{}], [{}]",
                JSON.toJSONString(exception.getRule()), exception.getRuleLimitApp());
        return new CommonResponse<>(
                -1,
                "flow rule trigger block exception",
                null
        );
    }
}

三、使用sentinel 保护 RestTemplate 服务间调用

1、配置RestTemplate

1.1、yml配置文件配置

# 开启或关闭 @SentinelRestTemplate 注解
resttemplate:
  sentinel:
    enabled: true

1.2、代码配置

/**
 * <h1>开启服务间的调用保护, 需要给 RestTemplate 做一些包装</h1>
 * */
@Slf4j
@Configuration
public class SentinelConfig {

    /**
     * <h2>包装 RestTemplate</h2>
     * */
    @Bean
    @SentinelRestTemplate(
            fallback = "handleFallback", fallbackClass = RestTemplateExceptionUtil.class,
            blockHandler = "handleBlock", blockHandlerClass = RestTemplateExceptionUtil.class
    )
    public RestTemplate restTemplate() {
        return new RestTemplate();  // 可以对其做一些业务相关的配置
    }
}

2、配置服务异常降级之后的处理方法和限流后的处理方法

/**
 * <h1>RestTemplate 在限流或异常时的兜底方法</h1>
 * */
@Slf4j
public class RestTemplateExceptionUtil {

    /**
     * <h2>限流后的处理方法</h2>
     * */
    public static SentinelClientHttpResponse handleBlock(HttpRequest request,
                                                         byte[] body,
                                                         ClientHttpRequestExecution execution,
                                                         BlockException ex) {
        log.error("Handle RestTemplate Block Exception: [{}], [{}]",
                request.getURI().getPath(), ex.getClass().getCanonicalName());
        return new SentinelClientHttpResponse(
                JSON.toJSONString(new JwtToken("qinyi-imooc-block"))
        );
    }

    /**
     * <h2>异常降级之后的处理方法</h2>
     * */
    public static SentinelClientHttpResponse handleFallback(HttpRequest request,
                                                            byte[] body,
                                                            ClientHttpRequestExecution execution,
                                                            BlockException ex) {
        log.error("Handle RestTemplate Fallback Exception: [{}], [{}]",
                request.getURI().getPath(), ex.getClass().getCanonicalName());
        return new SentinelClientHttpResponse(
                JSON.toJSONString(new JwtToken("qinyi-imooc-block"))
        );
    }
}

3、使用 Sentinel 保护 RestTemplate 服务间调用

/**
 * <h1>使用 Sentinel 保护 RestTemplate 服务间调用</h1>
 * */
@Slf4j
@RestController
@RequestMapping("/sentinel-rest-template")
public class SentinelRestTemplateController {

    private final RestTemplate restTemplate;

    public SentinelRestTemplateController(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    /**
     * <h2>从授权服务中获取 JwtToken</h2>
     * 1. 流控降级:
     * 是针对于簇点链路中的 http://127.0.0.1:7000/ecommerce-authority-center/authority/token
     * 2. 容错降级: 对于服务不可用时不能生效
     * */
    @PostMapping("/get-token")
    public JwtToken getTokenFromAuthorityService(
            @RequestBody UsernameAndPassword usernameAndPassword) {

        String requestUrl =
                "http://127.0.0.1:7000/ecommerce-authority-center/authority/token";
        log.info("RestTemplate request url and body: [{}], [{}]",
                requestUrl, JSON.toJSONString(usernameAndPassword));

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return restTemplate.postForObject(
                requestUrl,
                new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
                JwtToken.class
        );
    }
}

四、使用sentinel 对 fegin 熔断降级支持

1、配置fegin

# 打开 Sentinel 对 Feign 的支持
feign:
  sentinel:
    enabled: true

2、编写fegin client

/**
 * <h1>通过 Sentinel 对 OpenFeign 实现熔断降级</h1>
 * */
@FeignClient(
        value = "e-commerce-imooc",
        fallback = SentinelFeignClientFallback.class
)
public interface SentinelFeignClient {

    @RequestMapping(value = "qinyi", method = RequestMethod.GET)
    CommonResponse<String> getResultByFeign(@RequestParam Integer code);
}

3、编写Sentinel 对 OpenFeign 接口的降级策略


/**
 * <h1>Sentinel 对 OpenFeign 接口的降级策略</h1>
 * */
@Slf4j
@Component
public class SentinelFeignClientFallback implements SentinelFeignClient {

    @Override
    public CommonResponse<String> getResultByFeign(Integer code) {

        log.error("request supply for test has some error: [{}]", code);
        return new CommonResponse<>(
                -1,
                "sentinel feign fallback",
                "input code: "+ code
        );
    }
}

4、编写controller测试使用fegin的熔断降级

/**
 * <h1>OpenFeign 集成 Sentinel 实现熔断降级</h1>
 * */
@Slf4j
@RestController
@RequestMapping("/sentinel-feign")
public class SentinelFeignController {

    private final SentinelFeignClient sentinelFeignClient;

    public SentinelFeignController(SentinelFeignClient sentinelFeignClient) {
        this.sentinelFeignClient = sentinelFeignClient;
    }

    /**
     * <h2>通过 Feign 接口去获取结果</h2>
     * */
    @GetMapping("/result-by-feign")
    public CommonResponse<String> getResultByFeign(@RequestParam Integer code) {
        log.info("coming in get result by feign: [{}]", code);
        return sentinelFeignClient.getResultByFeign(code);
    }
}

五、使用sentinel 对 RestTemplate 熔断降级支持

1、编写服务熔断降级后的策略（controller中fallback中的方法和类中的方法参数必须一致）

/**
 * <h1>Sentinel 回退降级的兜底策略</h1>
 * 都需要是静态方法 fallback中的方法和类中的方法参数必须一致
 * */
@Slf4j
public class QinyiFallbackHandler {

    /**
     * <h2>getTokenFromAuthorityService 方法的 fallback</h2>
     * */
    public static JwtToken getTokenFromAuthorityServiceFallback(
            UsernameAndPassword usernameAndPassword
    ) {
        log.error("get token from authority service fallback: [{}]",
                JSON.toJSONString(usernameAndPassword));
        return new JwtToken("imooc-qinyi-fallback");
    }

    /**
     * <h2>ignoreException 方法的 fallback</h2>
     * */
    public static JwtToken ignoreExceptionFallback(Integer code) {
        log.error("ignore exception input code: [{}] has trigger exception", code);
        return new JwtToken("imooc-qinyi-fallback");
    }
}

2、编写controller测试使用RestTemplate的熔断降级

package com.imooc.ecommerce.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.fastjson.JSON;
import com.imooc.ecommerce.fallback_handler.QinyiFallbackHandler;
import com.imooc.ecommerce.vo.JwtToken;
import com.imooc.ecommerce.vo.UsernameAndPassword;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

/**
 * <h1>Sentinel 提供容错降级的功能 服务未启动（容错了）</h1>
 * */

@SuppressWarnings("all")
@Slf4j
@RestController
@RequestMapping("/sentinel-fallback")
public class SentinelFallbackController {

    /** 注入没有增强的 RestTemplate */
    private final RestTemplate restTemplate;

    public SentinelFallbackController(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @PostMapping("/get-token")
    @SentinelResource(
            value = "getTokenFromAuthorityService",
            fallback = "getTokenFromAuthorityServiceFallback",
            fallbackClass = { QinyiFallbackHandler.class }
    )
    public JwtToken getTokenFromAuthorityService(
            @RequestBody UsernameAndPassword usernameAndPassword) {

        String requestUrl =
                "http://127.0.0.1:7000/ecommerce-authority-center/authority/token";
        log.info("RestTemplate request url and body: [{}], [{}]",
                requestUrl, JSON.toJSONString(usernameAndPassword));

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return restTemplate.postForObject(
                requestUrl,
                new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
                JwtToken.class
        );
    }

    /**
     * <h2>让 Sentinel 忽略一些异常</h2>
     * */
    @GetMapping("/ignore-exception")
    @SentinelResource(
            value = "ignoreException",
            fallback = "ignoreExceptionFallback",
            fallbackClass = { QinyiFallbackHandler.class },
            exceptionsToIgnore = { NullPointerException.class }
    )
    public JwtToken ignoreException(@RequestParam Integer code) {

        if (code % 2 == 0) {
            throw new NullPointerException("yout input code is: " + code);
        }

        return new JwtToken("qinyi-imooc");
    }
}

五、Sentinel 结合 Nacos 实现限流规则持久化

1、SpringCloud Alibaba Sentinel 配置信息

2、整合nacos实现限流规则持久化

2.1、添加依赖

        <!-- Sentinel 使用 Nacos 存储规则 -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>

2.2、编写限流接口

    /**
     * <h2>在 dashboard 中 "流控规则" 中按照资源名称新增流控规则</h2>
     * */
    @GetMapping("/by-resource")
    @SentinelResource(
            value = "byResource",
            blockHandler = "qinyiHandleBlockException",
            blockHandlerClass = QinyiBlockHandler.class
    )
    public CommonResponse<String> byResource() {
        log.info("coming in rate limit controller by resource");
        return new CommonResponse<>(0, "", "byResource");
    }

2.3、yml配置（spring:cloud下）

    sentinel:
      # 配置 sentinel dashboard 地址
      transport:
        dashboard: 127.0.0.1:7777
        port: 8719 # 会在应用对应的机器上启动一个 Http Server, 该 Server 会与 Sentinel 控制台做交互
      # 服务启动直接建立心跳连接
      eager: true
      datasource:
        # 名称任意, 代表数据源
        ds:
          nacos:
            # NacosDataSourceProperties.java 中定义
            server-addr: ${spring.cloud.nacos.discovery.server-addr}
            dataId: ${spring.application.name}-sentinel
            namespace: ${spring.cloud.nacos.discovery.namespace}
            groupId: DEFAULT_GROUP
            data-type: json
            # 规则类型: com.alibaba.cloud.sentinel.datasource.RuleType
            # FlowRule 就是限流规则
            rule-type: flow

2.4、在nacos上编写指定限流接口的配置

[
  {
    "resource": "byresource",
    "limitApp": "default",
    "grade": 1,
    "count": 1,
    "strategy": 0,
    "controlBehavior": 0,
    "clusterMode": false
  }
]

六、Gateway集成Sentinel实现网关限流（不论那种方式硬编码中的样板代码必须添加在Gateway）

1、引入依赖

        <!-- 集成 Sentinel, 在网关层面实现限流 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
        </dependency>
        <!-- Sentinel 使用 Nacos 存储规则 -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>

2、编写配置文件（spring:cloud下）

    sentinel:
      # 配置 sentinel dashboard 地址
      transport:
        dashboard: 127.0.0.1:7777
        port: 8719 # 会在应用对应的机器上启动一个 Http Server, 该 Server 会与 Sentinel 控制台做交互
      # 服务启动直接建立心跳连接
      eager: true

3、硬编码方式实现

package com.imooc.ecommerce.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 com.alibaba.csp.sentinel.slots.block.RuleConstant;
import lombok.extern.slf4j.Slf4j;
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.*;

/**
 * <h1>Gateway 集成 Sentinel 实现限流</h1>
 * */
@Slf4j
@Configuration
public class SentinelGatewayConfiguration {
    //=====================================================样板间式代码开始=====================================================

    /** 视图解析器 */
    private final List<ViewResolver> viewResolvers;
    /** HTTP 请求和响应数据的编解码配置 */
    private final ServerCodecConfigurer serverCodecConfigurer;

    /**
     * <h2>构造方法</h2>
     * */
    public SentinelGatewayConfiguration(
            ObjectProvider<List<ViewResolver>> viewResolversProvider,
            ServerCodecConfigurer serverCodecConfigurer
    ) {
        this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);
        this.serverCodecConfigurer = serverCodecConfigurer;
    }

    /**
     * <h2>限流异常处理器, 限流异常出现时, 执行到这个 handler</h2>
     * */
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public SentinelGatewayBlockExceptionHandler sentinelGatewayBlockExceptionHandler() {
        // 默认会返回错误 message, code 429
        return new SentinelGatewayBlockExceptionHandler(
                this.viewResolvers,
                this.serverCodecConfigurer
        );
    }

    /**
     * <h2>限流过滤器, 是 Gateway 全局过滤器, 优先级定义为最高</h2>
     * */
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public GlobalFilter sentinelGatewayFilter() {
        return new SentinelGatewayFilter();
    }
    /** 
     * 自定义限流异常返回
     */
    @PostConstruct
    public void initBlockHandlers() {
        BlockRequestHandler blockRequestHandler = new BlockRequestHandler() {
            public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange, Throwable throwable) {
                Map result = new HashMap();
                result.put("code","500016");
                result.put("msg","接口被限流了");
                return ServerResponse.status(HttpStatus.OK).contentType(MediaType.APPLICATION_JSON).body(BodyInserters.fromObject(result));
            }
        };
        GatewayCallbackManager.setBlockHandler(blockRequestHandler);
    }

    //=====================================================样板间式代码结束=====================================================



    //=====================================================硬编码方式实现限流规则============================================//
    /**
     * <h2>初始化限流规则</h2>
     * */
//    @PostConstruct
    public void doInit() {

        log.info("---------------------------------------------------");

        // 加载网关限流规则
        log.info("load sentinel gateway rules (code define)");
        initGatewayRules();

        // 加载自定义限流异常处理器
        initBlockHandler();

        log.info("---------------------------------------------------");
    }

    /**
     * <h2>硬编码网关限流规则</h2>
     * */
    private void initGatewayRules() {

        Set<GatewayFlowRule> rules = new HashSet<>();

        GatewayFlowRule rule = new GatewayFlowRule();
        // 指定限流模式, 根据 route_id 做限流, 默认的模式
        rule.setResourceMode(SentinelGatewayConstants.RESOURCE_MODE_ROUTE_ID);
        // 指定 route_id -> service id
        rule.setResource("e-commerce-nacos-client");
        // 按照 QPS 限流
        rule.setGrade(RuleConstant.FLOW_GRADE_QPS);
        // 统计窗口和限流阈值
        rule.setIntervalSec(60);
        rule.setCount(3);

//        rules.add(rule);

        // 限流分组, Sentinel 先去找规则定义, 再去找规则中定义的分组
        rules.add(
                new GatewayFlowRule("nacos-client-api-1")
                        .setCount(3).setIntervalSec(60)
        );
        rules.add(
                new GatewayFlowRule("nacos-client-api-2")
                        .setCount(1).setIntervalSec(60)
        );

        // 加载到网关中
        GatewayRuleManager.loadRules(rules);

        // 加载限流分组
        initCustomizedApis();
    }

    /**
     * <h2>自定义限流异常处理器</h2>
     * */
    private void initBlockHandler() {

        // 自定义 BlockRequestHandler
        BlockRequestHandler blockRequestHandler = new BlockRequestHandler() {
            @Override
            public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange,
                                                      Throwable throwable) {

                log.error("------------- trigger gateway sentinel rule -------------");

                Map<String, String> result = new HashMap<>();
                result.put("code", String.valueOf(HttpStatus.TOO_MANY_REQUESTS.value()));
                result.put("message", HttpStatus.TOO_MANY_REQUESTS.getReasonPhrase());
                result.put("route", "e-commerce-nacos-client");

                return ServerResponse
                        .status(HttpStatus.TOO_MANY_REQUESTS)
                        .contentType(MediaType.APPLICATION_JSON)
                        .body(BodyInserters.fromValue(result));
            }
        };

        // 设置自定义限流异常处理器
        GatewayCallbackManager.setBlockHandler(blockRequestHandler);
    }

    /**
     * <h2>硬编码网关限流分组</h2>
     * 1. 最大限制 - 演示
     * 2. 具体的分组
     * */
    private void initCustomizedApis() {

        Set<ApiDefinition> definitions = new HashSet<>();

        // nacos-client-api 组, 最大的限制
        ApiDefinition api = new ApiDefinition("nacos-client-api")
                .setPredicateItems(new HashSet<ApiPredicateItem>() {
   
   {
                    // 模糊匹配 /imooc/ecommerce-nacos-client/ 及其子路径的所有请求
                    add(new ApiPathPredicateItem()
                            .setPattern("/imooc/ecommerce-nacos-client/**")
                            // 根据前缀匹配
                    .setMatchStrategy(SentinelGatewayConstants.URL_MATCH_STRATEGY_PREFIX));
                }});

        // nacos-client-api-1 分组
        ApiDefinition api1 = new ApiDefinition("nacos-client-api-1")
                .setPredicateItems(new HashSet<ApiPredicateItem>() {
   
   {
                    add(new ApiPathPredicateItem()
                            // 精确匹配 /imooc/ecommerce-nacos-client/nacos-client/service-instance
                            .setPattern("/imooc/ecommerce-nacos-client" +
                                    "/nacos-client/service-instance"));
                }});

        // nacos-client-api-2 分组
        ApiDefinition api2 = new ApiDefinition("nacos-client-api-2")
                .setPredicateItems(new HashSet<ApiPredicateItem>() {
   
   {
                    add(new ApiPathPredicateItem()
                            // 精确匹配 /imooc/ecommerce-nacos-client/nacos-client/project-config
                            .setPattern("/imooc/ecommerce-nacos-client" +
                                    "/nacos-client/project-config"));
                }});

        definitions.add(api1);
        definitions.add(api2);

        // 加载限流分组
        GatewayApiDefinitionManager.loadApiDefinitions(definitions);
    }
}

4、本地文件方式实现

4.1、编写路由规则

gateway-flow-rule-sentinel.json（路由规则，resource可以为接口名称、微服务名称、分组名称，resourceMode=1，resourceMode=0表示分组）

[
  {
    "resource": "e-commerce-nacos-client",
    "resourceMode": 0,
    "count": 3,
    "intervalSec": 60
  },
  {
    "resource": "nacos-client-api",
    "resourceMode": 1,
    "count": 1,
    "intervalSec": 60
  }
]

4.2、编写路由规则分组

gateway-flow-rule-api-sentinel.json（路由规则分组，表示resource中是apiname时，该分组中的接口路径都按照resource中的限流规则）

[
  {
    "apiName": "nacos-client-api",
    "predicateItems": [
      {
        "pattern": "/imooc/ecommerce-nacos-client/nacos-client/project-config"
      },
      {
        "pattern": "/imooc/ecommerce-nacos-client/**",
        "matchStrategy": 1
      }
    ]
  }
]

4.3、编写配置文件

    sentinel:
      eager: true
      transport:
        client-ip: 8720
        dashboard: 127.0.0.1:7777
      datasource:
        dsl.file:
          file: classpath:gateway-flow-rule-sentinel.json
          ruleType: gw-flow
        ds2.file:
          file: classpath:gateway-flow-rule-api-sentinel.json
          ruleType: gw-api-group

5、nacos方式实现

5.1、nacos上编写路由规则

gateway-flow-rule-sentinel.json（路由规则，resource可以为接口名称、微服务名称、分组名称，resourceMode=0为roteId，resourceMode=1表示api分组）

[
  {
    "resource": "e-commerce-nacos-client",
    "resourceMode": 0,
    "count": 3,
    "intervalSec": 60
  },
  {
    "resource": "nacos-client-api",
    "resourceMode": 1,
    "count": 1,
    "intervalSec": 60
  }
]

5.2、nacos上编写路由规则分组

gateway-flow-rule-api-sentinel.json（路由规则分组，表示resource中是apiname时，改分组中的接口路径都按照resource中的限流规则,matchStrategy=1表示为模糊匹配，默认为精确匹配）

[
  {
    "apiName": "nacos-client-api",
    "predicateItems": [
      {
        "pattern": "/imooc/ecommerce-nacos-client/nacos-client/project-config"
      },
      {
        "pattern": "/imooc/ecommerce-nacos-client/**",
        "matchStrategy": 1
      }
    ]
  }
]

5.3、编写yml配置文件

    sentinel:
      eager: true
      transport:
        client-ip: 8720
        dashboard: 127.0.0.1:7777
      datasource:
        # 名称任意, 代表数据源
        ds1:
          nacos:
            # NacosDataSourceProperties.java 中定义
            server-addr: ${spring.cloud.nacos.discovery.server-addr}
            dataId: gateway-flow-rule-sentinel
            namespace: ${spring.cloud.nacos.discovery.namespace}
            groupId: DEFAULT_GROUP
            data-type: json
            # 规则类型: com.alibaba.cloud.sentinel.datasource.RuleType
            # FlowRule 就是限流规则
            rule-type: gw_flow
        # 名称任意, 代表数据源
        ds2:
          nacos:
            # NacosDataSourceProperties.java 中定义
            server-addr: ${spring.cloud.nacos.discovery.server-addr}
            dataId: gateway-flow-rule-api-sentinel
            namespace: ${spring.cloud.nacos.discovery.namespace}
            groupId: DEFAULT_GROUP
            data-type: json
            # 规则类型: com.alibaba.cloud.sentinel.datasource.RuleType
            # FlowRule 就是限流规则
            rule-type: gw_api_group

SpringCloud Alibaba Sentinel 使用方式及限流规则持久化

一、SpringCloud Alibaba Sentinel 概述及控制台的搭建

1、SpringCloud Alibaba Sentinel 概述

2、Sentinel 控制台的搭建

2.1、下载地址

2.2、启动sentinel