SentinelFallbackHandler.java
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package com.huaheng.gateway.handler;
import java.nio.charset.StandardCharsets;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebExceptionHandler;
import reactor.core.publisher.Mono;
/**
* 自定义限流异常处理
*
* @author ruoyi
*/
public class SentinelFallbackHandler implements WebExceptionHandler
{
private Mono<Void> writeResponse(ServerResponse response, ServerWebExchange exchange)
{
ServerHttpResponse serverHttpResponse = exchange.getResponse();
serverHttpResponse.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
byte[] datas = "{\"status\":429,\"message\":\"请求超过最大数，请稍后再试\"}".getBytes(StandardCharsets.UTF_8);
DataBuffer buffer = serverHttpResponse.bufferFactory().wrap(datas);
return serverHttpResponse.writeWith(Mono.just(buffer));
}
@Override
public Mono<Void> handle(ServerWebExchange exchange, Throwable ex)
{
if (exchange.getResponse().isCommitted())
{
return Mono.error(ex);
}
if (!BlockException.isBlockException(ex))
{
return Mono.error(ex);
}
return handleBlockedRequest(exchange, ex).flatMap(response -> writeResponse(response, exchange));
}
private Mono<ServerResponse> handleBlockedRequest(ServerWebExchange exchange, Throwable throwable)
{
return GatewayCallbackManager.getBlockHandler().handleRequest(exchange, throwable);
}
}