package com.xiaopeng.trafficControl.config.log;
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import lombok.extern.slf4j.Slf4j;
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import org.slf4j.MDC;
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import org.springframework.core.Ordered;
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import org.springframework.core.annotation.Order;
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import org.springframework.http.MediaType;
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import org.springframework.stereotype.Component;
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import org.springframework.web.filter.OncePerRequestFilter;
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import org.springframework.web.util.ContentCachingRequestWrapper;
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import org.springframework.web.util.ContentCachingResponseWrapper;
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import javax.servlet.FilterChain;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* 请求/响应日志过滤器
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* 打印：traceId、method、uri、queryString、请求体、响应状态、耗时、响应体
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*/
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@Slf4j
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@Component
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@Order(Ordered.HIGHEST_PRECEDENCE + 10)
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public class RequestResponseLoggingFilter extends OncePerRequestFilter {
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/** 不打印 body 的路径前缀（健康检查、actuator 等） */
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private static final Set<String> EXCLUDE_PATHS = new HashSet<>(Arrays.asList(
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"/actuator", "/healthcheck", "/health", "/prometheus"
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));
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/** 只对这些 Content-Type 打印 body（避免打印二进制流） */
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private static final Set<String> LOGGABLE_CONTENT_TYPES = new HashSet<>(Arrays.asList(
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MediaType.APPLICATION_JSON_VALUE,
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MediaType.APPLICATION_JSON_UTF8_VALUE,
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MediaType.TEXT_PLAIN_VALUE,
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MediaType.TEXT_XML_VALUE,
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MediaType.APPLICATION_XML_VALUE,
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"application/x-www-form-urlencoded"
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));
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private static final int MAX_BODY_LENGTH = 2000;
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@Override
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protected boolean shouldNotFilter(HttpServletRequest request) {
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String uri = request.getRequestURI();
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return EXCLUDE_PATHS.stream().anyMatch(uri::startsWith);
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}
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@Override
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protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
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FilterChain chain) throws ServletException, IOException {
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// 初始化 MDC（Filter 先于 Interceptor 执行，在此统一设置）
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String traceId = request.getHeader("X-Trace-Id");
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if (traceId == null || traceId.isEmpty()) {
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traceId = java.util.UUID.randomUUID().toString().replace("-", "");
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}
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MDC.put("traceId", traceId);
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MDC.put("clientIp", getClientIp(request));
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MDC.put("requestUri", request.getRequestURI());
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response.setHeader("X-Trace-Id", traceId);
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ContentCachingRequestWrapper reqWrapper = new ContentCachingRequestWrapper(request);
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ContentCachingResponseWrapper respWrapper = new ContentCachingResponseWrapper(response);
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long start = System.currentTimeMillis();
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try {
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chain.doFilter(reqWrapper, respWrapper);
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} finally {
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long cost = System.currentTimeMillis() - start;
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logRequest(reqWrapper);
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logResponse(respWrapper, cost);
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// 必须把响应体写回，否则客户端收不到数据
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respWrapper.copyBodyToResponse();
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MDC.clear();
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}
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}
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private String getClientIp(HttpServletRequest request) {
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String ip = request.getHeader("X-Forwarded-For");
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if (ip != null && !ip.isEmpty() && !"unknown".equalsIgnoreCase(ip)) {
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return ip.split(",")[0].trim();
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}
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ip = request.getHeader("X-Real-IP");
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if (ip != null && !ip.isEmpty() && !"unknown".equalsIgnoreCase(ip)) {
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return ip;
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}
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return request.getRemoteAddr();
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}
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private void logRequest(ContentCachingRequestWrapper request) {
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String traceId = MDC.get("traceId");
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String uri = request.getRequestURI();
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String query = request.getQueryString();
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String method = request.getMethod();
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String body = extractBody(request.getContentAsByteArray(), request.getContentType());
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log.info(">>> [{}] {} {}{} | body={}",
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traceId,
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method,
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uri,
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query != null ? "?" + query : "",
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body);
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}
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private void logResponse(ContentCachingResponseWrapper response, long cost) {
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String traceId = MDC.get("traceId");
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int status = response.getStatus();
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String body = extractBody(response.getContentAsByteArray(), response.getContentType());
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log.info("<<< [{}] status={} cost={}ms | body={}",
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traceId, status, cost, body);
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}
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private String extractBody(byte[] bodyBytes, String contentType) {
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if (bodyBytes == null || bodyBytes.length == 0) {
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return "";
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}
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if (!isLoggableContentType(contentType)) {
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return "[binary, " + bodyBytes.length + " bytes]";
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}
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String body = new String(bodyBytes, StandardCharsets.UTF_8);
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if (body.length() > MAX_BODY_LENGTH) {
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body = body.substring(0, MAX_BODY_LENGTH) + "...(truncated)";
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}
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return body;
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}
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private boolean isLoggableContentType(String contentType) {
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if (contentType == null) return true;
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String ct = contentType.toLowerCase();
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return LOGGABLE_CONTENT_TYPES.stream().anyMatch(ct::contains);
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}
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}
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