✨ Introducing new features. 新增网关异常通用处理器

pig-gateway/src/main/java/com/pig4cloud/pig/gateway/config/GlobalExceptionConfiguration.java

+package com.pig4cloud.pig.gateway.config;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.pig4cloud.pig.common.core.util.R;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.web.server.ResponseStatusException;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.handler.ResponseStatusExceptionHandler;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author lengleng
+ * @date 2023-07-30
+ * <p>
+ * 网关异常通用处理器，只作用在webflux 环境下 , 优先级低于 {@link ResponseStatusExceptionHandler} 执行
+ */
+@Slf4j
+@Order(-1)
+@Configuration
+@RequiredArgsConstructor
+public class GlobalExceptionConfiguration implements ErrorWebExceptionHandler {
+
+	private final ObjectMapper objectMapper;
+
+	@Override
+	public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
+		ServerHttpResponse response = exchange.getResponse();
+
+		if (response.isCommitted()) {
+			return Mono.error(ex);
+		}
+
+		// header set
+		response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
+		if (ex instanceof ResponseStatusException) {
+			response.setStatusCode(((ResponseStatusException) ex).getStatusCode());
+		}
+
+		return response.writeWith(Mono.fromSupplier(() -> {
+			DataBufferFactory bufferFactory = response.bufferFactory();
+			try {
+				log.error("Error rquest :{} Error Spring Cloud Gateway : {}", exchange.getRequest().getPath(),
+						ex.getMessage());
+				return bufferFactory.wrap(objectMapper.writeValueAsBytes(R.failed(ex.getMessage())));
+			}
+			catch (JsonProcessingException e) {
+				log.warn("Error writing response", ex);
+				return bufferFactory.wrap(new byte[0]);
+			}
+		}));
+	}
+
+}