✨ Introducing new features.#I1IAND 网关通用异常处理器

pig-gateway/src/main/java/com/pig4cloud/pig/gateway/handler/GlobalExceptionHandler.java

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+package com.pig4cloud.pig.gateway.handler;
+
+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;
+
+/**
+ * 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
+ *
+ * @author 冷酱
+ * @date 2020/5/26
+ */
+@Slf4j
+@Order(-1)
+@Configuration
+@RequiredArgsConstructor
+public class GlobalExceptionHandler 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).getStatus());
+		}
+
+		return response
+			.writeWith(Mono.fromSupplier(() -> {
+				DataBufferFactory bufferFactory = response.bufferFactory();
+				try {
+					return bufferFactory.wrap(objectMapper.writeValueAsBytes(R.failed(ex.getMessage())));
+				} catch (JsonProcessingException e) {
+					log.error("Error writing response", ex);
+					return bufferFactory.wrap(new byte[0]);
+				}
+			}));
+	}
+
+}