sentinel如何整合spring cloud限流

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spring cloud基于http进行服务调用，大致过程如下：

• 服务提供端：提供Http接口，并向服务中心注册服务信息

• 服务消费端：将服务端的http接口作为本地服务，从注册中心读取服务提供端信息，使用feign发起远程调用

相关依赖

           <!-- 服务注册与发现 -->        <dependency>            <groupId>com.alibaba.cloud</groupId>            <artifactId>spring-cloud-starter-alibaba-Nacos-discovery</artifactId>        </dependency>        <!-- sentinel限流 -->        <dependency>            <groupId>com.alibaba.cloud</groupId>            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>        </dependency>

示例

为简化处理，直接对url接口进行限流，不做服务调用

application.yml

spring:  application:    name: hello-sentinel  cloud:    nacos:      discovery:        server-addr: localhost:8848    sentinel:      transport:        dashboard: localhost:8081

限流可使用本地配置、或者sentinel dashboard配置

HelloController

@RestControllerpublic class HelloController {     @SentinelResource(value = "hello", blockHandler = "blockHandle")    @RequestMapping("/hello")    public String hello(){        return "hello";    }    public String blockHandle(BlockException e){        e.printStackTrace();        return "被限流了";}

************

本地限流配置

CustomFlowRule

public class CustomFlowRule implements InitFunc {     @Override    public void init() throws Exception {        List<FlowRule> flowRules = new ArrayList<>();        FlowRule flowRule = new FlowRule();        flowRule.setResource("hello");        flowRule.setCount(1);        flowRule.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_DEFAULT);        flowRules.add(flowRule);        FlowRuleManager.loadRules(flowRules);    }}

META-INF/services/com.alibaba.csp.sentinel.init.InitFunc

com.example.demo.rule.CustomFlowRule

jmeter 测试

2022-03-27 22:30:50.534  INFO 1791 --- [           main] o.s.b.w.embedded.Tomcat.TomcatWEBServer  : Tomcat started on port(s): 8080 (http) with context path ''2022-03-27 22:30:50.547  INFO 1791 --- [           main] c.a.c.n.reGIStry.NacosServiceRegistry    : nacos registry, DEFAULT_GROUP hello-sentinel 192.168.5.11:8080 register finished2022-03-27 22:30:50.557  INFO 1791 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 2.227 seconds (JVM running for 2.824)2022-03-27 22:31:04.044  INFO 1791 --- [NIO-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'2022-03-27 22:31:04.044  INFO 1791 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'2022-03-27 22:31:04.049  INFO 1791 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 5 msINFO: Sentinel log output type is: fileINFO: Sentinel log charset is: utf-8INFO: Sentinel log base directory is: /Users/huli/logs/csp/INFO: Sentinel log name use pid is: falsecom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowException

************

sentinel dashboard配置限流

启动sentinel dashboard

java -Dserver.port=8081 -Dcsp.sentinel.dashboard.server=localhost:8081 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard.jar 参数说明：-Dserver.port=8081：指定控制台启动端口-Dcsp.sentinel.dashboard.server：指定控制台地址和端口-Dproject.name=sentinel-dashboard：指定控制台项目名称

localhost:8081，控制台配置流控策略

说明：若需使用本地降级方法，需在下方的hello配置流控规则

jmeter 测试

2022-03-28 08:50:29.165  INFO 853 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''2022-03-28 08:50:29.198  INFO 853 --- [           main] c.a.c.n.registry.NacosServiceRegistry    : nacos registry, DEFAULT_GROUP hello-sentinel 192.168.5.11:8080 register finished2022-03-28 08:50:29.210  INFO 853 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 3.315 seconds (JVM running for 4.03)2022-03-28 08:52:05.792  INFO 853 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'2022-03-28 08:52:05.793  INFO 853 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'2022-03-28 08:52:05.802  INFO 853 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed initialization in 9 msINFO: Sentinel log output type is: fileINFO: Sentinel log charset is: utf-8INFO: Sentinel log base directory is: /Users/huli/logs/csp/INFO: Sentinel log name use pid is: falsecom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowException

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