sentinel网关限流配置及使用

1、nacos配置

新增文件gdebs-gateway-sentinel.yml、gdebs-gateway-sentinel-dynamic.properties

spring:cloud:sentinel:eager: true#配置网关scg:fallback:content-type: application/json# 模式 response、redirectmode: response# 响应状态码response-status: ${sentinel.renturn.code}# 响应信息response-body: ${sentinel.renturn.msg}transport:dashboard: ${sentinel.dashboard.host}:${sentinel.dashboard.port}filter:enabled: falseip: gdebs-gateway-service# 控制台数据持久化配置datasource:ds1:nacos:server-addr: ${sentinel.nacos.host}:${sentinel.nacos.port}username: ${sentinel.nacos.name}password: ${sentinel.nacos.pwd}namespace: ${sentinel.nacos.namespace}group-id: ${sentinel.nacos.group}data-id: ${spring.application.name}-sentinel-flow-rules.jsondata-type: jsonrule-type: gw-flowds2:nacos:server-addr: ${sentinel.nacos.host}:${sentinel.nacos.port}username: ${sentinel.nacos.name}password: ${sentinel.nacos.pwd}namespace: ${sentinel.nacos.namespace}group-id: ${sentinel.nacos.group}data-id: ${spring.application.name}-sentinel-api-rules.jsondata-type: jsonrule-type: gw-api-groupgateway:# spring cloud gateway 路由配置方式discovery:locator:#表明gateway开启服务注册和发现的功能enabled: true#将请求路径上的服务名配置为小写lower-case-service-id: true

# sentinel控制台信息
sentinel.dashboard.host=xxxx
sentinel.dashboard.port=xxx# sentinel返回信息
sentinel.renturn.msg= 对不起，已经被限流了！！！
sentinel.renturn.code= xxx# sentinel数据持久化配置
sentinel.nacos.host=xxx.xx.xx.xx
sentinel.nacos.port=xxxx
sentinel.nacos.name=xx
sentinel.nacos.pwd=nacxxos
sentinel.nacos.namespace=xxx
sentinel.nacos.group=xxx
spring.application.name=xxx

<dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-datasource-nacos</artifactId></dependency><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><dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-spring-cloud-gateway-adapter</artifactId></dependency>

<dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-core</artifactId><version>1.8.6</version>
</dependency>

@RestController
@RequestMapping(value = "/sentinel")
@Api(value = "sentinel", tags = {"testController"})
public class TestController {@SentinelResource(value = "tesSentinel" , blockHandler = "myBlockHander")@PostMapping("/tesSentinel")public String tesSentinel() {return "1";}// 限流或者熔断之后执行的方法public String myBlockHander(BlockException blockException){if(blockException instanceof FlowException){// 限流异常return "您被限流了";}else if(blockException instanceof DegradeException){// 熔断异常return "您被熔断了";}return "被限制了";}
}

private void initFlowQpsRule() {List<FlowRule> rules=new ArrayList<>();System.out.println("限流初始化规则");// 定义一个限流规则FlowRule flowRule=new FlowRule();flowRule.setResource("tesSentinel"); // 资源名|必须参数flowRule.setGrade(RuleConstant.FLOW_GRADE_QPS); // 限流指标：QPS/线程数 |必须参数flowRule.setCount(1);  // 限流数量（上一步 QPS 或线程数的值） |必须参数flowRule.setStrategy(RuleConstant.STRATEGY_DIRECT); //调用关系限流策略【非必须设置】flowRule.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_RATE_LIMITER); // 流控效果【非必须设置】 排队等待flowRule.setMaxQueueingTimeMs(1000); // 等待超时时间flowRule.setClusterMode(false); // 是否集群限流【非必须设置，默认非集群】rules.add(flowRule);FlowRuleManager.loadRules(rules);}