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# sentinel
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package org.example;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
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import org.springframework.cloud.openfeign.EnableFeignClients;
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/**
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* <h1>Sentinel 集成到 SpringCloud 工程中</h1>
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* */
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@EnableFeignClients
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@EnableDiscoveryClient
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@SpringBootApplication
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public class SentinelClientApplication {
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public static void main(String[] args) {
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SpringApplication.run(SentinelClientApplication.class, args);
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}
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}
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package org.example.block_handler;
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import com.alibaba.csp.sentinel.slots.block.BlockException;
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import com.alibaba.fastjson2.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.vo.CommonResponse;
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/**
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* <h1>自定义通用的限流处理逻辑</h1>
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* */
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@Slf4j
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public class QBlockHandler {
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/**
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* <h2>通用限流处理方法</h2>
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* 这个方法必须是 static 的
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* */
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public static CommonResponse<String> qHandleBlockException(BlockException exception) {
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log.error("trigger q block handler: [{}], [{}]",
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JSON.toJSONString(exception.getRule()), exception.getRuleLimitApp());
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return new CommonResponse<>(
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-1,
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"flow rule trigger block exception",
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null
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);
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}
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}
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package org.example.conf;
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import com.alibaba.cloud.sentinel.rest.SentinelClientHttpResponse;
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import com.alibaba.csp.sentinel.slots.block.BlockException;
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import com.alibaba.fastjson.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.vo.JwtToken;
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import org.springframework.http.HttpRequest;
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import org.springframework.http.client.ClientHttpRequestExecution;
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/**
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* <h1>RestTemplate 在限流或异常时的兜底方法</h1>
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* */
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@Slf4j
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public class RestTemplateExceptionUtil {
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/**
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* <h2>限流后的处理方法</h2>
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* */
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public static SentinelClientHttpResponse handleBlock(HttpRequest request,
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byte[] body,
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ClientHttpRequestExecution execution,
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BlockException ex) {
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log.error("Handle RestTemplate Block Exception: [{}], [{}]",
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request.getURI().getPath(), ex.getClass().getCanonicalName());
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return new SentinelClientHttpResponse(
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JSON.toJSONString(new JwtToken("q-block"))
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);
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}
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/**
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* <h2>异常降级之后的处理方法</h2>
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* */
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public static SentinelClientHttpResponse handleFallback(HttpRequest request,
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byte[] body,
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ClientHttpRequestExecution execution,
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BlockException ex) {
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log.error("Handle RestTemplate Fallback Exception: [{}], [{}]",
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request.getURI().getPath(), ex.getClass().getCanonicalName());
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return new SentinelClientHttpResponse(
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JSON.toJSONString(new JwtToken("q-block"))
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);
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}
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}
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package org.example.conf;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.client.RestTemplate;
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/**
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* <h1>开启服务间的调用保护, 需要给 RestTemplate 做一些包装</h1>
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* */
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@Slf4j
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@Configuration
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public class SentinelConfig {
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/**
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* <h2>包装 RestTemplate</h2>
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* */
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@Bean
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// @SentinelRestTemplate(
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// fallback = "handleFallback", fallbackClass = RestTemplateExceptionUtil.class,
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// blockHandler = "handleBlock", blockHandlerClass = RestTemplateExceptionUtil.class
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// )
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public RestTemplate restTemplate() {
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return new RestTemplate(); // 可以对其做一些业务相关的配置
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}
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}
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package org.example.controller;
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import com.alibaba.csp.sentinel.annotation.SentinelResource;
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import com.alibaba.csp.sentinel.slots.block.BlockException;
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import com.alibaba.csp.sentinel.slots.block.RuleConstant;
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import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
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import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
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import com.alibaba.fastjson2.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.block_handler.QBlockHandler;
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import org.example.vo.CommonResponse;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import javax.annotation.PostConstruct;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* <h1>流控规则硬编码的 Controller</h1>
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* */
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@Slf4j
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@RestController
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@RequestMapping("/code")
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public class FlowRuleCodeController {
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/**
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* <h2>初始化流控规则</h2>
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* */
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@PostConstruct
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public void init() {
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// 流控规则集合
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List<FlowRule> flowRules = new ArrayList<>();
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// 创建流控规则
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FlowRule flowRule = new FlowRule();
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// 设置流控规则 QPS, 限流阈值类型 (QPS, 并发线程数)
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flowRule.setGrade(RuleConstant.FLOW_GRADE_QPS);
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// 流量控制手段
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flowRule.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_DEFAULT);
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// 设置受保护的资源
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flowRule.setResource("flowRuleCode");
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// 设置受保护的资源的阈值
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flowRule.setCount(1);
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flowRules.add(flowRule);
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// 加载配置好的规则
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FlowRuleManager.loadRules(flowRules);
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}
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/**
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* <h2>采用硬编码限流规则的 Controller 方法</h2>
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* */
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@GetMapping("/flow-rule")
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// @SentinelResource(value = "flowRuleCode")
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// @SentinelResource(value = "flowRuleCode", blockHandler = "handleException")
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@SentinelResource(
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value = "flowRuleCode", blockHandler = "qHandleBlockException",
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blockHandlerClass = QBlockHandler.class
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)
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public CommonResponse<String> flowRuleCode() {
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log.info("request flowRuleCode");
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return new CommonResponse<>(0, "", "q-ecommerce");
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}
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/**
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* <h2>当限流异常抛出时, 指定调用的方法</h2>
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* 是一个兜底策略, 必须和上面使用的方法在一个类中
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* */
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public CommonResponse<String> handleException(BlockException exception) {
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log.error("has block exception: [{}]", JSON.toJSONString(exception.getRule()));
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return new CommonResponse<>(
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-1,
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"flow rule exception",
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exception.getClass().getCanonicalName()
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);
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}
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}
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package org.example.controller;
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import com.alibaba.csp.sentinel.annotation.SentinelResource;
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import lombok.extern.slf4j.Slf4j;
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import org.example.block_handler.QBlockHandler;
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import org.example.vo.CommonResponse;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* <h1>基于 Sentinel 控制台配置流控规则</h1>
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* Sentinel 是懒加载的, 先去访问一下, 就可以在 Sentinel Dashboard 看到了
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* */
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@Slf4j
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@RestController
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@RequestMapping("/dashboard")
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public class RateLimitController {
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/**
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* <h2>在 dashboard 中 "流控规则" 中按照资源名称新增流控规则</h2>
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* */
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@GetMapping("/by-resource")
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@SentinelResource(
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value = "byResource",
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blockHandler = "qHandleBlockException",
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blockHandlerClass = QBlockHandler.class
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)
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public CommonResponse<String> byResource() {
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log.info("coming in rate limit controller by resource");
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return new CommonResponse<>(0, "", "byResource");
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}
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/**
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* <h2>在 "簇点链路" 中给 url 添加流控规则</h2>
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* */
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@GetMapping("/by-url")
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@SentinelResource(value = "byUrl")
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public CommonResponse<String> byUrl() {
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log.info("coming in rate limit controller by url");
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return new CommonResponse<>(0, "", "byUrl");
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}
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}
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package org.example.controller;
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import com.alibaba.csp.sentinel.annotation.SentinelResource;
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import com.alibaba.fastjson.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.fallback_handler.QFallbackHandler;
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import org.example.vo.JwtToken;
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import org.example.vo.UsernameAndPassword;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.MediaType;
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import org.springframework.web.bind.annotation.*;
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import org.springframework.web.client.RestTemplate;
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/**
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* <h1>Sentinel 提供容错降级的功能</h1>
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* */
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@SuppressWarnings("all")
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@Slf4j
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@RestController
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@RequestMapping("/sentinel-fallback")
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public class SentinelFallbackController {
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/** 注入没有增强的 RestTemplate */
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private final RestTemplate restTemplate;
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public SentinelFallbackController(RestTemplate restTemplate) {
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this.restTemplate = restTemplate;
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}
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@PostMapping("/get-token")
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@SentinelResource(
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value = "getTokenFromAuthorityService",
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fallback = "getTokenFromAuthorityServiceFallback",
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fallbackClass = { QFallbackHandler.class }
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)
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public JwtToken getTokenFromAuthorityService(
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@RequestBody UsernameAndPassword usernameAndPassword) {
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String requestUrl =
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"http://127.0.0.1:7000/dev-protocol-springcloud-project-authority-center/authority/token";
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log.info("RestTemplate request url and body: [{}], [{}]",
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requestUrl, JSON.toJSONString(usernameAndPassword));
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HttpHeaders headers = new HttpHeaders();
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headers.setContentType(MediaType.APPLICATION_JSON);
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return restTemplate.postForObject(
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requestUrl,
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new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
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JwtToken.class
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);
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}
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/**
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* <h2>让 Sentinel 忽略一些异常</h2>
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* */
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@GetMapping("/ignore-exception")
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@SentinelResource(
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value = "ignoreException",
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fallback = "ignoreExceptionFallback",
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fallbackClass = { QFallbackHandler.class },
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exceptionsToIgnore = { NullPointerException.class }
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)
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public JwtToken ignoreException(@RequestParam Integer code) {
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if (code % 2 == 0) {
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throw new NullPointerException("yout input code is: " + code);
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}
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return new JwtToken("qinyi-imooc");
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}
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}
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package org.example.controller;
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import lombok.extern.slf4j.Slf4j;
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import org.example.feign.SentinelFeignClient;
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import org.example.vo.CommonResponse;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* <h1>OpenFeign 集成 Sentinel 实现熔断降级</h1>
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* */
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@Slf4j
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@RestController
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@RequestMapping("/sentinel-feign")
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public class SentinelFeignController {
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private final SentinelFeignClient sentinelFeignClient;
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public SentinelFeignController(SentinelFeignClient sentinelFeignClient) {
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this.sentinelFeignClient = sentinelFeignClient;
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}
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/**
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* <h2>通过 Feign 接口去获取结果</h2>
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* */
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@GetMapping("/result-by-feign")
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public CommonResponse<String> getResultByFeign(@RequestParam Integer code) {
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log.info("coming in get result by feign: [{}]", code);
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return sentinelFeignClient.getResultByFeign(code);
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}
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}
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package org.example.controller;
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import com.alibaba.fastjson.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.vo.JwtToken;
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import org.example.vo.UsernameAndPassword;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.MediaType;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.client.RestTemplate;
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/**
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* <h1>使用 Sentinel 保护 RestTemplate 服务间调用</h1>
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* */
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@Slf4j
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@RestController
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@RequestMapping("/sentinel-rest-template")
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public class SentinelRestTemplateController {
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private final RestTemplate restTemplate;
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public SentinelRestTemplateController(RestTemplate restTemplate) {
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this.restTemplate = restTemplate;
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}
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/**
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* <h2>从授权服务中获取 JwtToken</h2>
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* 1. 流控降级:
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* 是针对于簇点链路中的 http://127.0.0.1:7000/ecommerce-authority-center/authority/token
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* 2. 容错降级: 对于服务不可用时不能生效
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* */
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@PostMapping("/get-token")
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public JwtToken getTokenFromAuthorityService(
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@RequestBody UsernameAndPassword usernameAndPassword) {
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String requestUrl =
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"http://127.0.0.1:7000/dev-protocol-springcloud-project-authority-center/authority/token";
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log.info("RestTemplate request url and body: [{}], [{}]",
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requestUrl, JSON.toJSONString(usernameAndPassword));
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HttpHeaders headers = new HttpHeaders();
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headers.setContentType(MediaType.APPLICATION_JSON);
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return restTemplate.postForObject(
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requestUrl,
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new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
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JwtToken.class
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);
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}
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}
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package org.example.fallback_handler;
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import com.alibaba.fastjson2.JSON;
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import lombok.extern.slf4j.Slf4j;
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import org.example.vo.JwtToken;
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import org.example.vo.UsernameAndPassword;
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/**
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* <h1>Sentinel 回退降级的兜底策略</h1>
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* 都需要是静态方法
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* */
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@Slf4j
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public class QFallbackHandler {
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/**
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* <h2>getTokenFromAuthorityService 方法的 fallback</h2>
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* */
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public static JwtToken getTokenFromAuthorityServiceFallback(
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UsernameAndPassword usernameAndPassword
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) {
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log.error("get token from authority service fallback: [{}]",
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JSON.toJSONString(usernameAndPassword));
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return new JwtToken("q-fallback");
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}
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/**
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* <h2>ignoreException 方法的 fallback</h2>
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* */
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public static JwtToken ignoreExceptionFallback(Integer code) {
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log.error("ignore exception input code: [{}] has trigger exception", code);
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return new JwtToken("q-fallback");
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}
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}
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package org.example.feign;
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import org.example.vo.CommonResponse;
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import org.springframework.cloud.openfeign.FeignClient;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import org.springframework.web.bind.annotation.RequestParam;
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/**
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* <h1>通过 Sentinel 对 OpenFeign 实现熔断降级</h1>
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* */
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@FeignClient(
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value = "dev-protocol-springcloud-sentinel-null", // 定义不存在的服务名称, 测试是否正常执行
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fallback = SentinelFeignClientFallback.class
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)
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public interface SentinelFeignClient {
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@RequestMapping(value = "qinyi", method = RequestMethod.GET)
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CommonResponse<String> getResultByFeign(@RequestParam Integer code);
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}
|
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@ -0,0 +1,22 @@
|
||||
package org.example.feign;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
import org.example.vo.CommonResponse;
|
||||
import org.springframework.stereotype.Component;
|
||||
|
||||
/**
|
||||
* <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
|
||||
);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,59 @@
|
||||
server:
|
||||
port: 8100
|
||||
servlet:
|
||||
context-path: /dev-protocol-springcloud-sentinel
|
||||
|
||||
spring:
|
||||
application:
|
||||
name: dev-protocol-springcloud-sentinel # 应用名称也是构成 Nacos 配置管理 dataId 字段的一部分 (当 config.prefix 为空时)
|
||||
cloud:
|
||||
nacos:
|
||||
# 服务注册发现
|
||||
discovery:
|
||||
enabled: true # 如果不想使用 Nacos 进行服务注册和发现, 设置为 false 即可
|
||||
server-addr: 127.0.0.1:8848
|
||||
# server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850 # Nacos 服务器地址
|
||||
namespace: 1ccc74ae-9398-4dbe-b9d7-4f9addf9f40c
|
||||
metadata:
|
||||
management:
|
||||
context-path: ${server.servlet.context-path}/actuator
|
||||
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
|
||||
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
|
||||
# 服务启动直接建立心跳连接
|
||||
eager: true
|
||||
|
||||
# 暴露端点
|
||||
management:
|
||||
endpoints:
|
||||
web:
|
||||
exposure:
|
||||
include: '*'
|
||||
endpoint:
|
||||
health:
|
||||
show-details: always
|
||||
|
||||
# 打开 Sentinel 对 Feign 的支持
|
||||
feign:
|
||||
sentinel:
|
||||
enabled: true
|
||||
|
||||
# 开启或关闭 @SentinelRestTemplate 注解
|
||||
resttemplate:
|
||||
sentinel:
|
||||
enabled: true
|
||||
@ -0,0 +1,3 @@
|
||||
### 硬编码的流控规则
|
||||
GET 127.0.0.1:8100/dev-protocol-springcloud-sentinel/code/flow-rule
|
||||
Content-Type: application/json
|
||||
@ -0,0 +1,7 @@
|
||||
### 根据资源名称限流
|
||||
GET 127.0.0.1:8100/dev-protocol-springcloud-sentinel/dashboard/by-resource
|
||||
Content-Type: application/json
|
||||
|
||||
### 根据 URL 限流
|
||||
GET 127.0.0.1:8100/dev-protocol-springcloud-sentinel/dashboard/by-url
|
||||
Content-Type: application/json
|
||||
@ -0,0 +1,12 @@
|
||||
### 获取 token
|
||||
POST 127.0.0.1:8100/dev-protocol-springcloud-sentinel/sentinel-fallback/get-token
|
||||
Content-Type: application/json
|
||||
|
||||
{
|
||||
"username": "1@qqq.com",
|
||||
"password": "25d55ad283aa400af464c76d713c07ad"
|
||||
}
|
||||
|
||||
### 忽略异常
|
||||
GET 127.0.0.1:8100/dev-protocol-springcloud-sentinel/sentinel-fallback/ignore-exception?code=2
|
||||
Content-Type: application/json
|
||||
@ -0,0 +1,3 @@
|
||||
### Sentinel Feign Client
|
||||
GET 127.0.0.1:8100/dev-protocol-springcloud-sentinel/sentinel-feign/result-by-feign?code=200
|
||||
Content-Type: application/json
|
||||
@ -0,0 +1,8 @@
|
||||
### 获取 Token
|
||||
POST 127.0.0.1:8100/dev-protocol-springcloud-sentinel/sentinel-rest-template/get-token
|
||||
Content-Type: application/json
|
||||
|
||||
{
|
||||
"username": "1@qqq.com",
|
||||
"password": "25d55ad283aa400af464c76d713c07ad"
|
||||
}
|
||||
Loading…
Reference in New Issue