基于@SentinelResource的规则错误优化

最新推荐文章于 2022-08-20 18:04:41 发布

雪峰.贵

最新推荐文章于 2022-08-20 18:04:41 发布

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分类专栏： sentinel 文章标签： restful java spring

本文链接：https://blog.csdn.net/Tiny_Demon/article/details/124784601

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本文详细介绍了如何在Spring Boot项目中集成Sentinel流量控制和降级处理，包括配置dashboard地址、使用@SentinelResource注解，以及自定义URL阻塞处理。通过实例展示如何创建MyUrlBlockHandler处理不同类型的Sentinel异常，并在dashboard中测试规则。

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1. 加配置

spring:
    sentinel:
      transport:
        dashboard: localhost:8080
      filter:
        enabled: true #使@SentinelResource 生效

2. 加@SentinelResource注解

    @GetMapping("/{id}")
    @SentinelResource("SentinelResource-ShareConroller-findById")
    public ShareDTO findById(@PathVariable("id") Integer id) {
        return this.shareService.findById(id);
    }

3.创建 MyUrlBlockHandler类


import com.alibaba.csp.sentinel.adapter.servlet.callback.UrlBlockHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class MyUrlBlockHandler implements UrlBlockHandler {
    @Override
    public void blocked(HttpServletRequest request, HttpServletResponse response, BlockException ex) throws IOException {
        ErrorMsg msg = null;
        if (ex instanceof FlowException) {
            msg = ErrorMsg.builder()
                    .status(100)
                    .msg("限流了")
                    .build();
        } else if (ex instanceof DegradeException) {
            msg = ErrorMsg.builder()
                    .status(101)
                    .msg("降级了")
                    .build();
        } else if (ex instanceof ParamFlowException) {
            msg = ErrorMsg.builder()
                    .status(102)
                    .msg("热点参数限流")
                    .build();
        } else if (ex instanceof SystemBlockException) {
            msg = ErrorMsg.builder()
                    .status(103)
                    .msg("系统规则（负载/...不满足要求）")
                    .build();
        } else if (ex instanceof AuthorityException) {
            msg = ErrorMsg.builder()
                    .status(104)
                    .msg("授权规则不通过")
                    .build();
        }
        // http状态码
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Type", "application/json;charset=utf-8");
        response.setContentType("application/json;charset=utf-8");
        // spring mvc自带的json操作工具，叫jackson
        new ObjectMapper()
                .writeValue(
                        response.getWriter(),
                        msg
                );
    }
}

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
class ErrorMsg {
    private Integer status;
    private String msg;
}