使用Sentinel自定义返回和实现区分来源方式

@Component
public class MyUrlBlockHandler implements BlockExceptionHandler {

    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse response, BlockException ex) throws Exception {
        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;
}

@Component
public class MyRequestOriginParser implements RequestOriginParser {
    @Override
    public String parseOrigin(HttpServletRequest request) {
        // 从请求参数中获取名为 origin 的参数并返回
        // 如果获取不到origin参数，那么就抛异常

        String origin = request.getParameter("origin");
        if (StringUtils.isBlank(origin)) {
            throw new IllegalArgumentException("origin must be specified");
        }
        return origin;
    }
}